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Fertilising Commercial Forest Species in Southern Africa: Research Progress and Problems (Part 1)
Item type: Journal Article • Journal: South African Forestry Journal • Authors: M.A. Herbert --- , South Africa A. P.G. Schönau --- , South AfricaSince the inception of forest fertiliser research in Southern Africa in 1926, eight eucalypt, six pine and four acacia species have been tested, encompassing a wide range of sites in summer, winter and uniform rainfall areas. Marked deficiencies of P,... -
The Relationship between Soil Water Status, Rainfall and the Growth of Eucalyptus grandis
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D.I. Boden --- Institute for Commercial Forestry Research, South AfricaAvailable soil water is recognised as the main factor influencing the growth of commercial plantations in southern Africa. This is of strategic importance as successive rotations of demanding species such as Eucalyptus grandis may be depleting the soil water reserves... -
The Hydrological Effects of a Wildfire in a Eucalypt Afforested Catchment
Item type: Journal Article • Journal: South African Forestry Journal • Authors: D.F. Scott --- Division of Forest Science and Technology, Jonkershoek Forestry Research Centre, RSA R.E. Schulze --- Department of Agricultural Engineering, RSAA high-intensity wildfire through a humid, upland catchment which was partially afforested to Eucalyptus fastigata, markedly increased stormflows and caused high soil losses off the afforested slopes. Total streamflow yield was unchanged but baseflow was reduced after the fire. The... -
Analysis of Stable Isotopes of Xylem Water from Plantation Trees in E. Transvaal and Zululand Indicate they Utilised Ground water During Drought of 1992
Item type: Journal Article • Journal: South African Forestry Journal • Authors: J.J. Midgley --- , South Africa S. Talma --- , South Africa D. Scott --- , South Africa B. Olbrich --- , South Africa G.F. van Wyk --- , South AfricaWe investigated the stable isotopic signature of xylem sap of mature plantation trees and the associated ground water at sites in Zululand and E. Transvaal. The survey took place mainly during the drought of 1992. Results indicated a range of... -
Afloopstudies vanaf natuurlike veld in verskillende suksessiestadia van die sentrale oranje‐vrystaat
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: H.A. Snyman --- Department Weidingsleer, D.P.J. Opperman --- Department Weidingsleer,Afloopbane met ‘n helling van 4,13% is gebruik om die afloopverliese, fitomassaproduksie en waterverbruiksdoel‐treffendheid (WVD: Bogrondse fitomassa geproduseer in verhouding tot die evapotranspirasieverliese), van natuurlike veld in verskillende suksessiestadia vir die periode Julie 1977 tot Junie 1983 te monitor. -
Ranking of grass species according to visible wilting order and rate of recovery in the central orange free state
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: H.A. Snyman --- , W.D. Venter --- , W.L.J. van Rensburg --- , D.P.J. Opperman --- ,A number of grasses were ranked according to the order in which they wilted with diminishing moisture availability, and according to their ability to recover after water replenishment. Digitaria eriantha and Digitaria argyrograpta were the most sensitive to moisture stress,... -
The influence of an Acacia karroo tree on grass production in its vicinity
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.C. Stuart‐Hill --- Department of Agriculture and Water Supply (East Cape Region), N.N. Tainton --- Department of Agriculture and Water Supply (East Cape Region), H.J. Barnard --- Department of Agriculture and Water Supply (East Cape Region),The investigation was concerned with the impact of an Acacia karroo tree on the productivity of the surrounding herbaceous layer. -
Evapotranspirasie in drie plantgemeenskappe van ‘n Rhigozum trichotomum habitat te upington
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: A. Moore --- , J.A.J. Van Eck --- , J.P. Van Niekerk --- , B.L. Robertson --- ,Evapotranspirasie in drie plantgemeenskappe van ‘n R. trichotomum habitat, naamlik, suiwer gras, suiwer R. trichotomum en ‘n gemengde stand van R. trichotomum en gras is gedurende die 1985–86 groeiseisoen bestudeer. Drie persele van elke plantgemeenskap is hidrologies geisoleer, besproei en... -
Korttermyn invloed van strawwe droogte op veldtoestand en waterverbruiksdoeltreffendheid van grasveld in die sentrale Oranje‐Vrystaat
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: H.A. Snyman --- , Republiek van Suid‐Afrika W.L.J. van Rensburg --- , Republiek van Suid‐AfrikaShort‐term effect of severe drought on veld condition and water use efficiency of grassveld in the central Orange Free State. The impact of an intensive drought (1982/1983 and 1983/84‐growing seasons) on botanical composition, basal cover, mortality of grazing plants and... -
Relations between soil factors and herbage yields of natural grassland on sandy soils in the south‐eastern Transvaal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.L. Barnes --- Department of Agricultural Development (Transvaal Region), Republic of South Africa M. Swart --- Department of Agricultural Development (Transvaal Region), Republic of South Africa M.F. Smith --- , Republic of South Africa G.H. Wiltshire --- , Republic of South AfricaForty systematically‐placed observation points were established in a 1.5‐ha area of floristically unifoim veld in which productivity varied spatially. At each point grass yields were determined by harvesting quadrats at eight‐week intervals during the growing season, and the volumetric water... -
Relationship between cation exchange capacity, clay content and water retention of Highveld soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AstridM. Lambooy --- ,Water in the soil is held by capillary and adsorption forces. These forces are mainly a function of clay content and mineralogy. To neglect the influence of clay mineralogy when estimating the water-holding properties of soil, implies that only a... -
Effect of soil fertility on the vegetative growth, yield and water use of wheat (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.G. Annandale --- Department of Plant Production, Republic of South Africa P.S. Hammes --- Department of Plant Production, Republic of South Africa P.C. Nel --- Department of Plant Production, Republic of South AfricaWell-fertilized wheat was found to use more water than wheat on poorly fertilized plots, but the yield was increased, resulting in increased water-use efficiency. Variations in leaf area duration after anthesis accounted for 81% of the variation in yield. -
Soil-water conservation as affected by primary tillage practices
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.J. Berry --- Summer Grain Sub-Centre, J.B. Mallett --- Summer Grain Sub-Centre, M.A. Johnston --- ,An investigation of water conservation as affected by different primary tillage methods was conducted on a soil of the Doveton series (fine-loamy, mixed, thermic family of Rhodic Paleudults), where a direct sampling technique was used to monitor the soil-water profiles... -
Soil-water conservation as affected by primary tillage practices
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.J. Berry --- Summer Grain Sub-Centre, J.B. Mallett --- Summer Grain Sub-Centre, M.A. Johnston --- ,An investigation of water conservation as affected by different primary tillage methods was conducted on a soil of the Doveton series (fine-loamy, mixed, thermic family of Rhodic Paleudults), where a direct sampling technique was used to monitor the soil-water profiles... -
Intercropping of beans (Phaseolus vulgaris L.) and sugar-cane: The effect of inter-specific competition on the growth of plant cane
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. F.A. Leclezio --- Department of Crop Science, J.D. Lea --- Department of Crop Science, P.K. Moberly --- ,The competitive effects of intercropped beans (maturation period: three months) on the growth, tiller development and yield of plant sugar-cane (maturation period: 18 months) in the subhumid coast-hinterland of Natal were investigated over two seasons. In the first season rainfall... -
Empinese verwantskappe tussen veldkapasiteit en sekere fisiese grondeienskappe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Hoëveldstreek, Departement van Landbou en Watervoorsiening,Veldkapasiteit (VK) is in situ bepaal op verskeie gronde in Wes- Kaapland. Grondtekstuur het gewissel van sand tot sandklei. Veldkapasiteit is op vyf dieptes bepaal en het gevarieer van 4,9% tot 27,2% op massabasis. Matrikspotensiaal by VK het gewissel van... -
Effect of planting date on the phenology, seed yield, and fatty acid composition of three sunflower (Helianthus annuus L.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.N. de Vos --- , J. Dreyer --- , J.D. Lea --- Department of Crop Science,Four planting dates (early October to mid-January) were used to obtain a range of environmental conditions for growing three sunflower cultivars. The effect of planting date on phenological development was small compared to that of genotype though the hybrid S0404... -
'n Vergelyking tussen berekende en in situ onversadigde geleivermoë van 'n sand en 'n sandkleileem
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-AfrikaOnversadigde geleivermoë, K(θ), is bereken vanaf verskeie vergelykings gebaseer op poriegrootteverspreiding en die grondwaterretensiekromme. Versadigde geleivermoë (Ks ) is as passingsfaktor gebruik en is verkry vanaf laboratorium-en veldbepalings. Berekende K(θ) is by verskillende porieklasse vergelyk met waardes vanaf in situ-... -
Carbohydrate fractions of Themeda triandra (red grass). I. Free sugars and water soluble polysaccharides
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.L. van Biljon --- Department of Biochemistry, P.L. le Roux --- Department of Biochemistry,Sucrose, glucose and fructose were the major free sugars in the leaves, stems and inflorescences of T. triandra, while small quantities of rhamnose, xylose, galactose, mannose, ribose, cellobiose, sedoheptulose and erythrose were also present. Several polysaccharides and components with lower... -
Assessment of recent drought severity for natural grassland at three locations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. Dyer --- Crop Production Division, Canada J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaThe relative severity of drought in natural grassland during three growing seasons was analyzed for three South African weather stations. Computer simulation of grassland water use, based upon weather records, was used to quantify drought and to compare the conditions... -
Die invloed van nat grondtoestande op die vrugkwaliteit van appels
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.F. Lourens --- ,Vrugontledings op appels van bome op gedeeltelik versuipte gronde gedurende die vruggroei-periode het hoër Na- en B- en laer N- en Mg-peile getoon as appels van bome op droër gronde. Die vrugte van nat persele was fermer en het hoër... -
Kleimineralogie, katioonuitruilkapasiteit en waterhouvermoë van grondvorms in die Hoëveldstreek
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AstridM. Hattingh --- Hoëveldstreek, Departement van Landbou en Watervoorsiening,Kleimineralogiese data vir 12 grondvorms, wat algemeen in die Hoëveldstreek voorkom, is ondersoek. Die persentasie monsters waarin 'n bepaalde kleimineraal voorkom, is bereken. Daaruit is dit duidelik dat smektiet algemeen in gronde van die Arcadia-, Bonheim, en Rensburgvorms voorkom, maar... -
Canopy temperature as a plant water stress indicator for nectarines
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Helga Tormann --- ,Three-year-old nectarine trees of the cultivar Independence grown in free-drainage lysimeters were exposed to a wet and a dry treatment, i.e. high soil moisture content throughout or progressive soil drying respectively. The canopy temperature of the trees was measured with... -
Die invloed van verdigtingspoging, klei-en waterinhoud op verdigting van geselekteerde Hoëveldgronde
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. A.G. Henning --- Departement van Landbou en Watervoorsiening, D.J. Nel --- Departement Bodemkunde, PU vir CHO, H. J. van M. Harmse --- Departement Bodemkunde, PU vir CHO,Die verwantskap tussen kegelpenetrasieweerstand en droë brutodigtheid word deur die mate van sortering beïnvloed. By swak sortering word laer penetrasieweerstande as in die geval van matige sortering met spesifieke brutodigthede geassosieer. Waterinhoud waarby maksimum verdigting plaasvind, word deur klei-inhoud en... -
Water retentivity of some South African soils in relation to particle size criteria and bulk density
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.L. Hutson --- ,Retentivity data for 409 South African soils were obtained from several sources. Water retained at matric potential values of 0, −1, −3, −10, −30, −100, −500 and −1500 kPa was determined from the retentivity curve for each soil core. Retentivity... -
In situ field comparisons of Citrus jambhiri leaf water potential using hygrometric and pressure chamber methods
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.J. Savage --- Department of Soil Science and Agrometeorology, A. Cass --- Department of Soil Science and Agrometeorology, H.H. Wiebe --- Biology Department, U.S.A.In an experiment conducted outdoors, using Citrus jambhiri plants, we obtained comparative in situ dew point hygrometer, Psychrometer and pressure chamber water potential measurements. Partial abrasion of the leaf cuticle was effected prior to sealing thermocouple hygrometers against leaf surfaces... -
On the concept of leaching requirement for salinity control
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.M. du Plessis --- ,The concept of irrigating in excess of plant water requirement to restrict soil profile salinity to acceptable limits is well established. The tolerable upper salinity limit is used to calculate the leaching requirement. This upper limit is determined mainly by... -
Evaluering van braakstelsels vir droëlandkoringverbouing in die Oranje-Vrystaat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. Engelbrecht --- , Republiek van Suid-Afrika A.J. der Westhuizen --- , Republiek van Suid-Afrika G.D. Joubert --- , Republiek van Suid-AfrikaDrie produksiestelsels vir droëlandkoring is te Glen en Bethlehem geëvalueer. Die kortbraak was vyf tot ses maande, intermediêre-braak was 12 tot 13 maande en langbraak was 17 maande. Glen verteenwoordig 'n semi-ariede somerreëngebied waar die proefgrond 'n plantbeskikbare-waterstoorkapasiteit van 148... -
Water storage, soil temperatures and maize (Zea mays L.) growth for various tillage practices
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.J. Berry --- Summer Grain Sub-Centre, Republic of South Africa J.B. Mallett --- Summer Grain Sub-Centre, Republic of South Africa P.L. Greenfield --- Department of Crop Science, Republic of South AfricaFour tillage treatments ranging from conventional mouldboard ploughing through to direct-drilling were repeated during the second season of an ongoing experiment. At commencement of the new season, differences in plant- available water (PAW) in the top 600 mm of the... -
Leaf water retention of excised leaves as a measure of drought resistance in grain sorghum (Sorghum bicolor L. Moench) genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.G. Wenzel --- , Republic of South Africa W.J. van den Berg --- , Republic of South AfricaThe objective of these experiments was to evaluate the usefulness of the excised leaf water retention capability (ELWRC) technique for screening grain sorghum genotypes for drought resistance. Seven genotypes were planted in a randomized block consisting of four replications. The... -
'n Vergelyking van koringkultivars ten opsigte van droogteverdraagsaamheid
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.D. Joubert --- , Republiek van Suid-Afrika'n Proef met vyf koringkultivars en twee vogpeile (50 en 80% van veldwaterkapasiteit) is in 'n glashuis uitgevoer. Kultivarverskiile in droëmateriaalakkumulasie is verkry by die lae vogpeil. Gamtoos het die grootste blaaroppervlakte en blaarmassa gehad by die vlagblaarstadium en uiteindelik... -
Changes in plant water relations of wheat and soybeans after relief of water stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sue Walker --- Department Land, Air and Water Resources, Veihmeyer Hall, U.S.A. D.M. Oosterhuis --- Department of Agronomy, U.S.A. Judy Eastham --- , Republic of South AfricaThe ability of a crop to recover from a mild or severe water stress and the rate of recovery are of importance for irrigation management and are also linked to the drought resistance and water use efficiency of the crop... -
Stomatal resistance measurement as an indicator of water deficit stress in wheat and soybeans
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.M. Oosterhuis --- Department of Agronomy, U.S.A. Sue Walker --- Department Land, Air and Water Resources, Veihmeyer Hall, U.S.A.The usefulness of stomatal response as an indicator of the onset and development of water stress was studied over five seasons in field-grown wheat (Triticum aestivum L.) and soybeans (Glycine max L. Merr.). With the onset of water stress, stomatal... -
'n Vergelyking tussen hidrouliese geleivermoë en vernante eienskappe van 'n fynsand en 'n fynsandkleileem tydens in sity-dreinering
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Beukes --- Hoëveldstreek, Departement van Landbou en Watervoorsiening, Republiek van Suid-AfrikaIn situ-dreineringstudies is in triplikaat op elk van 'n fynsand (Shashaserie) en 'n fynsandkleileem (Msingaserie) uitgevoer. Die ondersoek het 340 uur geduur waartydens op vyf dieptes metings van volumetriese waterinhoud (θ) en matrikspotensiaal (ψm) gedoen is. Unieke verwantskappe tussen θ,... -
'n Vogstremmingsindeks vir gebruik in besproeiing van katoen
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Dippenaar --- , Republiek van Suid-Afrika Catharina Weyers --- , Republiek van Suid-AfrikaDie behoefte bestaan om plantparameters as kritiese indikatore aan te wend om besproeiingsbestuur te vergemaklik. Die blaarwaterpotensiaal (ψb) van katoen en relatiewe turgiditeit (RT%) van blaarskyfies is gedurende 1983 tot 1985 en tydens die 1986/87-seisoen bepaal. Hierdie metings is op... -
Risk analysis of wheat production in the central Orange Free State using a growth model
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- Department of Agrometeorology, Republic of South Africa J.M. de Jager --- Department of Agrometeorology, Republic of South AfricaA wheat crop growth model (Singels, 1983) was refined and used to calculate annual grain yield from weather data for 45 seasons in the Bloemfontein area. Five different levels of profile-available water capacity were used as soil input parameter. Other... -
Influence of abscisic acid on polyphenol oxidase browning potential in avocado
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.P. Bower --- , Republic of South Africa J. G.M. Cutting --- , Republic of South AfricaVarious levels of abscisic acid (ABA) were infused into unripened ‘Fuerte’ avocado fruit. After ripening, polyphenol oxidase (PPO) activity was measured, and abscisic acid (ABA) levels monitored. The study showed that an increase in applied ABA increased PPO levels, particularly... -
The effect of tillage: maize residue interactions upon soil water storage
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.J. Berry --- , Republic of South Africa J.B. Mallett --- , Republic of South AfricaFour months before planting a crop of maize, a study was commenced on a well-drained clay loam soil to test the effect of tillage and surface maize residue on soil water storage. Tillage main plots were split into bare (residue... -
Effect of water stress on cane growth and water use of sugar cane
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.G. Inman-Bamber --- , Republic of South Africa J.M. de Jager --- , Republic of South AfricaThe growth and water use of three sugar cane cultivars, NCo376, N12 and N14, were measured under varying degrees of water stress controlled by means of a movable rain shelter. Plots of a first ratoon cane crop were allowed to... -
Genotypic variation in leaf water potential of field-grown soybeans (Glycme max L. Merr.) and its association with dryland yield
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.F. Grant --- , Republic of South Africa J.D. Lea --- Department of Crop Science, Republic of South AfricaMaintenance of leaf water potential (ΨL) during periods of water stress may constitute an important drought-avoiding response. The identification of genotypic variation for this characteristic is, however, made difficult by the fact that comparative values for ΨL must be measured... -
Watervlakke in sekere gronde van die Noordwestelike Oranje-Vrystaat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. A.G. Henning --- , Republiek van Suid-Afrika D.J. Nel --- Departement Bodemkunde, P.U. vir C.H.O., Republiek van Suid-AfrikaDie akkumulasie van vrywater in sekere gronde in die Noordwestelike Oranje-Vrystaat word geassosieer met verskillende tipes stadig-deurlaatbare lae (keerlae). Voorlopige ondersoeke het aangetoon dat die langtermyn-storing van water verskil tussen twee tipes keerlaag, naamlik 'n kleilaag en 'n harde plintiese... -
Measurement of water potential in the trunks of citrus trees using screen-caged thermocouple Psychrometers
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.M. Oosterhuis --- Department of Agronomy, U.S.A. M.J. Savage --- Department of Soil Science and Agrometeorology, Republic of South Africa H.H. Wiebe --- Biology Department, U.S.A.Screen-caged thermocouple Psychrometers were used to non-destructively measure the water potential (ψ) in the trunks of mature citrus trees (Citrus sinensis L. Osbeck), and the values compared with the ψ of covered, exposed, and shaded leaves of the same tree... -
An evaluation of simplified field methods used for estimating soil hydraulic conductivity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K.D. Fuller --- , Republic of South Africa J.H. Moolman --- Department of Soil Science, Republic of South AfricaHydraulic properties of three soils from the western Cape and two from the eastern Cape were studied. Water content (θ) data, obtained during drainage of field plots were used to estimate soil hydraulic conductivity [K(θ)] using five methods based on... -
Drought sensitivity of maize (Zea mays L.) in relation to soil fertility and water stress during different growth stages
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.E. Steynberg --- Department of Plant Production, Republic of South Africa P.C. Nel --- Department of Plant Production, Republic of South Africa P.S. Hammes --- Department of Plant Production, Republic of South AfricaMaize was grown under controlled conditions in a pot experiment to determine how drought sensitivity would be affected by differential soil fertilities. Soil was obtained from a fertilization field trial where soil fertility differences developed over a period of 45... -
Effect of soil nutritional status and irrigation on plant available water of wheat (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.G. Annandale --- Department of Plant Production, Republic of South Africa A.A. Nel --- Department of Plant Production, Republic of South Africa P.C. Nel --- Department of Plant Production, Republic of South AfricaPlant available water (PAW) is the amount of water in the soil profile available for crop use. When irrigation management is based on a percentage depletion of PAW accurate estimates of PAW are essential and it is important that factors... -
The effect of removing maize surface residue from the seed-row on seedzone temperature, soil water and maize development
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. A.J. Berry --- Summer Grain Sub-Centre, Republic of South Africa J.B. Mallett --- Summer Grain Sub-Centre, Republic of South AfricaEarly maize development is generally less rapid in the cooler soils of tillage systems which maintain large amounts of crop residues (stubble) on the soil surface. However, soil water storage tends to increase with increasing amount of surface cover, and... -
Die effek van vertraging van besproeiing op die opbrengs en kwaliteit van katoen (Gossypium hirsutum L.) in die Vaalhartsbesproeiingsgebied
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. de Kock --- Landboufakulteit, Republiek van Suid-Afrika J.J. Human --- Landboufakulteit, Republiek van Suid-Afrika L.P. de Bruyn --- Landboufakulteit, Republiek van Suid-AfrikaAangesien dit reeds bekend is dat katoen tydens die eerste stadia van die groeiperiode minder gevoelig vir watertekorte is, is 'n proef oor drie seisoene op Vaalharts uitgelê waar die eerste besproeiing na opkom van die saailinge uitgestel is totdat... -
Bepaling van donkerrespirasie by mielies (Zea mays L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W.H. du Preez --- Landboufakulteit, Republiek van Suid-Afrika J.J. Human --- Landboufakulteit, Republiek van Suid-Afrika L.P. de Bruyn --- Landboufakulteit, Republiek van Suid-AfrikaTwee mieliecultivars wat in potte onder glashuistoestande met optimale watervoorsiening gekweek is, is gedurende die agtblaarstadium en stuifmeelstort tot baardverskyning aan stremming onderwerp deur watertoediening te weerhou. Die CO2-uitvloeitempo is op sekere tye gedurende die nagperiode gemonitor. Hierdie waardes het... -
Nitrogen mineralization, nitrification and nitrogen balance in laboratory incubation of soil from natural grassland in the central Orange Free State
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South AfricaAir-dried soil from three layers under grassveld was moistened by the addition of 12 levels of water and incubated for up to two years at five temperatures in screw-capped preserving jars with an air-filled head- space equivalent to seven times... -
Quantifying leaf water potential for scheduling irrigation of wheat under specific soil-climate conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South Africa P.R. Berliner --- , IsraelThe relationship between soil water deficit (SWD), potential evapotranspiration (PET) and midday leaf water potential (LWP) of irrigated spring wheat was studied at Roodeplaat to determine if LWP can easily be estimated from SWD and PET so that it can... -
Role of temperature and water potential on the activity of some acetanilide herbicides on three Phaseolus taxa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E. van Rensburg --- , Republic of South Africa L.P. van Dyk --- , Republic of South Africa G.H. de Swardt --- , Republic of South AfricaThe effect of three acetanilide herbicides on the hypocotyl-epicotyl growth rate of three Phaseolus taxa was studied at two temperatures and two water potentials. The study proved that, apart from the detrimental effects of the herbicides, low temperature and water... -
The effect of leaf water potential on the carbon-dioxide uptake rate during different growth stages of wheat (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Human --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa W.J. Roux --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa L.P. de Bruyn --- Department of Agronomy, Faculty of Agriculture, Republic of South AfricaThe effect of water stress on the CO2 uptake rate was measured at three different growth stages of wheat grown in Mitscherlich pots in a glasshouse experiment. Stress was induced by withholding water until the leaf water potential reached −2... -
The effect of seeding rate, timing of nitrogen application and frequency of irrigation on wheat growth, yield and water use
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South Africa F.J. Dijkhuis --- , Republic of South AfricaWheat (Triticum aestivum cv. SST66) was planted in a 2 × 2 × 2 factorial field experiment. Factors investigated were seeding rate, timing of nitrogen application and frequency of irrigation. The two seeding rates were 85 and 170 kg ha−1... -
Use of estimated leaf water potential for irrigation timing of wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South Africa F.J. Dijkhuis --- , Republic of South AfricaA regression model with which the leaf water potential (LWP) of wheat can be estimated from soil water content and potential evapotranspiration was developed from data generated during 1986. This model was used during the 1988 wheat season to decide... -
The effect of ridging on the soil water status of a waterlogged vineyard soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , Republic of South Africa J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaIn a field trial conducted in a vineyard on a low-lying hydromorphic soil, it was established that ridging increased the depth from the soil surface to the water table. Ridging did not lower the level of the water table, but... -
Ridging—a soil preparation practice to improve aeration of vineyard soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , Republic of South Africa J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaWaterlogged soil conditions during early spring can result in poor grapevine performance. In this study the effect of ridging as a method of soil preparation on the depth to the water table, soil air composition and vine reaction, as indicated... -
Wheat yield probabilities on the Glen/Shorrocks ecotope with different soil water contents at planting
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Hensley --- Department of Agricultural Development, Republic of South Africa P.J. Snyman --- Department of Agricultural Development, Republic of South AfricaTo avoid unnecessary crop failures it would be valuable to have a reliable threshold value of the root zone water content for wheat at planting (θ rp ) below which the risk is too high to plant. An attempt has... -
Prosedures en probleme by die gebruik van die PUTU9–87 gewasgroeisimulasiemodel vir koring onder besproeiing in die Vanderkloof-Staatswaterskema
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. H.F. Botes --- Departement Landbou-ekonomie, Republiek van Suid-Afrika L.K. Oosthuizen --- Departement Landbou-ekonomie, Republiek van Suid-AfrikaDie doel van hierdie ondersoek was om die PUTU9–87 gewasgroeisimulasiemodelte kalibreer om koringop-brengste en die grondwaterinhoud op 'n bevredlgende wyse in die Vanderkloof-Staatswaterskema te voor- spel, gegewe beperkte eksperimentele data. Opbrengste wat met PUTU voorspel is, word vergelyk met eksperimentele... -
A slope sequence of Podzols in the southern Cape, South Africa 1. Physical and micromorphological properties
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.C. Hawker --- Department of Geography, South Africa T.H. van Rooyen --- Department of Geography, South Africa R.W. Fitzpatrick --- Department of Geography, South AfricaIn South Africa the characteristics of Podzols, with or without placic horizons, and the complex processes involved in their formation, are generally still poorly understood. To investigate both these aspects thoroughly, these soils were studied in the landscape context, described... -
Polymer effect on infiltration and erosion of sodic soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Gal --- , Republic of South Africa R. Stern --- , Republic of South Africa J. Levin --- , Republic of South Africa M. Ben-Hur --- , Republic of South AfricaRunoff from irrigated sodic soils is a common phenomenon in arid and semi-arid climates. The effect of a low-charge polysaccharide (LCCP) on infiltration rate (IR) and runoff on two red apedal soils was studied using an irrigation simulator. One was... -
Die invloed van verskillende waterregimes op Up-to-date aartappels II. Opbrengs, grootteverspreiding, kwaliteit en waterverbruik
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.M. Steyn --- , Republiek van Suid-Afrika H.F. du Plessis --- , Republiek van Suid-Afrika P.F. Nortjé --- , Republiek van Suid-AfrikaDrie besproeiingsbehandelings (20, 50 en 70% onttrekking van plantbeskikbare water) is toegepas ten einde die optimum peil van grondwateronttrekking by aartappels te bepaal. Die proef is gedurende die 1987 en 1988 herfsseisoene uitgevoer. Totale waterverbruik van behandelings is bereken en... -
Maize response to plant population and soil water supply: I. Yield of grain and total above-ground biomass
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. van Averbeke --- Department of Agronomy, J.N. Marais --- Department of Agronomy,The effect of the level of water deficit on the yield of grain and total above-ground biomass of maize planted at greatly differing densities was investigated in a strictly controlled field experiment, repeated for four seasons. Differences in water supply... -
Effect of ridging on the temperature regime of a waterlogged vineyard soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , Republic of South Africa J.H. Moolman --- Department of Soil and Agricultural Water Science, Republic of South AfricaWaterlogged conditions in hydromorphic soils during spring cause low temperatures which may restrict grapevine performance. Ridging is a soil preparation method that can improve internal drainage in the root zone. Temperature measurements showed that ridging tended to increase temperatures in... -
Die invloed van golwende onderliggende paleosols op seisoenale fluktuasies van vrywatervlakke in eoliese sand van die noordwestelike Oranje-Vrystaat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. A.G. Henning --- Departement Plant en Bodemwetenskappe, Republiek van Suid-Afrika H. J. von M. Harmse --- Departement Plant en Bodemwetenskappe, Republiek van Suid-AfrikaDie resultate verkry gedurende hierdie ondersoek dui op akkumulasie van water in holtes van 'n golwende kleierige ondergrond onder oorliggende sand van eoliese oorsprong. Seisoenale veranderings in die diepte van watervlakke is die gevolg van seisoenale verspreidingspatrone van reënval. Die... -
Protein turnover: possible contributing factor in determining drought tolerance in Nicotiana tabacum L.
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L. van Rensburg --- Department of Plant and Soil Sciences, Republic of South Africa G. H.J. Krüger --- Department of Plant and Soil Sciences, Republic of South AfricaDrought stress-induced changes in the water-soluble protein concentration and total number of sulphydryl (-SH) groups were monitored under controlled environmental conditions in four tobacco cultivars (Nicotiana tabacum L.) with different drought tolerances. The drought stress ranged from light (-0.52 MPa)... -
The effect of water stress on the efficacy of diclofop-methyl and CGA 184′927+S on wild oat (Avena fatua)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.A. Agenbag --- Department of Agronomy and Pastures, Department of Botany, Republic of South Africa O.T. de Villiers --- Department of Botany, Republic of South Africa J.J. van Biljon --- Agricultural Division, Ciba-Geigy, Republic of South AfricaThe response of wild oat (Avena fatua) to diclofop-methyl and CGA 184′927+S under conditions of water stress was assessed in a pot experiment. Treatments with 0, 8, 16 and 24% polyethylene glycol (PEG 6000) were used to impose water stress... -
Estimation of soil water retention from clay content and cation exchange capacity values of soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. D.P. Botha --- , Republic of South Africa B.E. Eisenberg --- , Republic of South AfricaSoil water characteristics can be estimated accurately from the clay content and cation exchange capacity (CEC) values of soils. The clay with its very large adsorption surface and CEC which reflects the negative charge of clays, is jointly responsible for... -
Chemical composition of carrier water influences glyphosate efficacy
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.L. de Villiers --- Small Grain Centre, Republic of South Africa D. du Toit --- , Republic of South AfricaGlyphosate [N-(phosphonomethyl) glycine] phytotoxicity was assessed with different sources of natural water carriers to establish to what extent ions in these carriers antagonize glyphosate activity. Glyphosate phytotoxicity with the most antagonistic carrier was 72% less than with deionized water. Antagonistic... -
Soil water use and rooting depth of Italian ryegrass (Lolium multiflorum Lam.) in a small plot experiment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.E. Steynberg --- Department of Plant Production, Republic of South Africa P.C. Nel --- Department of Plant Production, Republic of South Africa N. F.G. Rethman --- Department of Plant Production, Republic of South AfricaItalian ryegrass is planted mainly under irrigation in the summer rainfall region of South Africa. Irrigation practices are often based on the assumption that Italian ryegrass has an extremely shallow root system. A small plot experiment was conducted to ascertain... -
Maize response to plant population and soil water supply II. Plant barrenness and harvest index
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. van Averbeke --- Department of Agronomy, Ciskei J.N. Marais --- Department of Agronomy, CiskeiThe effects of level of water deficit and plant population density on plant barrenness and harvest index were investigated in a strictly controlled field experiment, repeated for four seasons. Differences in soil water supply were obtained by the seasonal variation... -
The effects of leather tannery sludge on the leachates from soil columns
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Hughes --- Department of Agronomy, Republic of South Africa S. J.A. Girdlestone --- Department of Agronomy, Republic of South AfricaLeather tannery sludge from a chrome-tanning plant was added to the surface horizon of a typic haplustox from South Africa at rates equivalent to 0, 10 and 100 t ha−1. Leaching columns were set up with 100 mm of the... -
Water use rate and crop factors of Italian ryegrass (Lolium multiflorum Lam.) under simulated grazing conditions in a small plot experiment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.E. Steynberg --- Department of Plant Production, Republic of South Africa P.C. Nel --- Department of Plant Production, Republic of South Africa N. F.G. Rethman --- Department of Plant Production, Republic of South AfricaNo species specific irrigation norms are available for pastures in South Africa. A small plot experiment was conducted to establish irrigation norms for Italian ryegrass. Potential evapotranspiration was calculated by the Penman-Monteith formula. Crop factors were determined as the ratio... -
Salts in carrier water affect tralkoxydim activity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.L. De Villiers --- Small Grain Centre, Agricultural Research Council, Republic of South AfricaTralkoxydim {2-[1-(ethoxyimino)-3-hydroxy-5-(2,4,6-trimethyl-phenyl)]cyclohex-2-enone} was tested for susceptibility to antagonism from ions in the carrier water with which it is applied. Borehole and municipal water and deionized water, to which various salts were added, were tested. Tralkoxydim activity was antagonized by 20%... -
Physiological response of spring wheat cultivars to post-anthesis water stress intensity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South Africa O.T. de Villiers --- Department of Botany, Republic of South AfricaWheat crops produced under dryland conditions in the winter rainfall belt of South Africa are often subjected to water stress. To study the effect of water stress on the spring wheat cultivars Nantes, Palmiet and SST 66, an experiment was... -
Quality response of spring wheat cultivars to post-anthesis water stress intensity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South Africa O.T. de Villiers --- Department of Botany, Republic of South AfricaThe effect of different intensities of water stress imposed during the first three weeks of grain filling were determined on the protein content, protein composition and bread volume of three spring wheat cultivars. Water stress was induced by watering the... -
Fertilizer placement of maize. II. Root growth and water use
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. du Toit --- , Republic of South Africa J.J. Human --- , Republic of South AfricaNormal fertilizer placement, two placements deeper than normal, a broadcast application and a non-fertilized control were compared to maximize production in a stubble tillage system. Root growth was evaluated at three growth stages from tassel initiation to flowering during the... -
Fotosintesetempo en stomatadiffusieweerstand van aartappels soos beïnvloed deur waterstremming
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.F. du Plessis --- , Republiek van Suid-Afrika J.M. Steyn --- , Republiek van Suid-AfrikaDie invloed van waterstremming in aartappelplante op netto fotosintesetempo en stomatadiffusieweerstand is tydens 'n herfsaanplanting ondersoek. Watertoediening is op 14, 28 en 42 dae na opkom gestaak om sodoende verskillende waterstremmingsperiodes tydens die groeiseisoen toe te pas. Hierdie Studie is... -
Improved criteria for classifying hydric soils in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.C. Kotze --- Department of Grassland Science, Republic of South Africa J.R. Klug --- Department of Grassland Science, Republic of South Africa J.C. Hughes --- Department of Agronomy, Republic of South Africa C.M. Breen --- , Republic of South AfricaThere is an increasing awareness of the ecological and agricultural importance of hydric (wetland) soils. Because of the scarcity of information in South Africa, this study aimed to critically examine systems currently being applied to the hydric soils of South... -
Evaluation of the relative water content and the reduction of 2,3,5-triphenyltetrazoliumchloride as indicators of drought tolerance in spring wheat cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. D.R. van Heerden --- Department of Botany, Republic of South Africa O.T. de Villiers --- Department of Botany, Republic of South AfricaThe aim of this study was to evaluate the relative water content and the reduction of 2,3,5-triphenyltetrazoliumchloride, as indicators of drought stress and drought tolerance in spring wheat cultivars (Triticum aestivum L.) grown in the Western Cape. Drought stress was... -
Water-holding capacity of rock fragments in rehabilitated opencast mine soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.L. Schoeman --- , South Africa M.M. Kruger --- , South Africa A.H. Loock --- , South AfricaThe water-holding capacity of rock fragments sampled from spoil materials underlying rehabilitated opencast coal mine soils was determined. Four rock types, ranging from grit and coarse sandstone to carbonaceous shale, and four fractions of different size were investigated by means... -
Evaluation of CERES-wheat v2.10: Soil water content under rainfed conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. H.O. du Toit --- , South Africa J.L. Purchase --- , South Africa M. Hensley --- , South AfricaIn the semi-arid wheat production areas of the Free State province, the low and erratic rainfall, especially during early spring, is the most limiting natural resource for rainfed wheat production. Accurate simulation of soil water content by crop growth simulation... -
Optimizing glyphosate performance with adjuvants
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.L. de Villiers --- , South Africa R.C. Lindeque --- , South Africa H.A. Smit --- , South AfricaGlyphosate [N-(phosphonomethyl)glycine] is a non-selective herbicide which is extremely sensitive to antagonism by salts in the spray solution and to environmental conditions at application. Various adjuvants were evaluated with glyphosate in glasshouse and field experiments with the aim of identifying... -
The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape I. Characterization of colour-defined horizons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- , South Africa F. Ellis --- , South AfricaSoil colour is an easily identifiable property that is invariably used as a parameter in all soil classification systems including the system used in South Africa. To test the hypothesis that soil colour is a reflection of the soil water... -
The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape II. Predicting duration of water saturation and evaluation of colour definitions for colour-defined horizons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- , South Africa F. Ellis --- Faculty of Forestry, South Africa J. J.N. Lambrechts --- Faculty of Agricultural Sciences, South AfricaExisting colour indices were evaluated to determine their correlation with duration of water saturation, for a hydrosequence in the Grabouw district, Western Cape. Correlation coefficients ranged between 0.31 and 0.63. More simple colour indices were developed. Dry soil colour is... -
A comparison of three methods of soil water content determination
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K.M. Little --- , Republic of South Africa B. Metelerkamp --- , New Zealand C.W. Smith --- , Republic of South AfricaIn forestry the need to manage plantations on a sustainable site-specific basis requires the understanding and management of any growth limiting factors. Soil water regime is a factor considered to be of prime importance with respect to explaining differences in... -
A comparison of two methods of inducing water stress in wheat (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. Strauss --- Department of Agronomy and Pastures, G.A. Agenbag --- Department of Agronomy and Pastures,The aim of this study was to compare the withholding of water and the use of polyethylene glycol (PEG) as methods of inducing water stress in spring wheat cultivars (Triticum aestivum L.) grown in the Western Cape. Water stress was... -
The aluminium response network in perennial ryegrass (Lolium perenne): II. Water fluxes and ion transport
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- , Republic of South Africa A. Stewart --- , New ZealandAluminium toxicity was investigated by analyzing the mineral nutrition and water-use characteristics of hydroponically-grown plants differing in tolerance to Al when subjected to Al (0, 20, 40, 80 μM: pH 4.5) for 28 days. Both lines reacted to Al by... -
The use of physiological parameters to identify drought tolerance in spring wheat cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.A. Strauss --- Department of Agronomy and Pastures, Republic of South Africa G.A. Agenbag --- Department of Agronomy and Pastures, Republic of South AfricaWheat crops produced under dryland conditions in the winter rainfall region of South Africa often experience periods of water stress. It is, therefore, important to identify spring wheat cultivars that can withstand these conditions. The multitude of factors potentially involved... -
The aluminium response network in Themeda triandra Fosk. III: Regulatory mechanisms and aluminium tolerance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.J. Bennet --- , Republic of South Africa J.E. Granger --- , Republic of South AfricaAluminium toxicity was investigated by analyzing the reaction of hydroponically-grown plants of two ecotypes of T. triandra to Al (0, 25, 50, 100 μM; pH 4.1; for 28 days). The Al-tolerant 'Berg ecotype responded to the Al treatments by increasing... -
Improving seed germination of Stylosanthes guianensis by means of warm water treatment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Erasmus --- Department of Agronomy, Republic of South Africa P.J. Pieterse --- Department of Agronomy, Republic of South AfricaThe effect of different warm water treatments on the dormancy of hard-coated Stylosanthes guianensis seeds was investigated. Light and dark coloured seeds were placed into water at different temperatures. Warm water treatments induced a large number of soft-coated seeds. The... -
The effect of soil compaction on the water retention characteristics of soils in forest plantations
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CW Smith --- , MA Johnston --- , SA Lorentz --- ,A study was carried out to evaluate the relative effects of soil compaction on the water retention characteristics of a range of soils in forest plantations in the summer rainfall regions of South Africa. In all cases compaction resulted in... -
The effect of water stress during grain filling on the yield and processing quality of sunflower seed
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republic of South Africa H.L. Loubser --- , Republic of South Africa P.S. Hammes --- Department of Plant Production and Soil Science, Republic of South AfricaThe oil and protein contents of sunflower seed are affected by water stress. Hullability is a seed quality trait which affects the efficiency of oil extrusion and the quality of the oil cake produced from the seed. Apart from cultivars,... -
Grondgeassosieerde, lineêre plantegroeipatrone in die Warmbadomgewing van die Limpopo-provinsie van Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Dinkelmann --- Departement Geografie en Omgewingstudies, E. Verster --- Departement Geografie en Omgewingstudies, T.H. van Rooyen --- Departement Geografie en Omgewingstudies,Lineêre mikroreliëfverskynsels wat op lugfoto's soos vingerafdrukpatrone vertoon en bestaande uit boomryke kruine en grasryke trôe is op die voethang van die Baviaansberg, Warmbadomgewing (Suid-Afrika) beskryf. Vir die doel om die oorsprong van die verskynsels te verklaar is van 'n... -
Evaluation of sorghum inbred lines for milling quality
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Setimela --- , Botswana D.J. Andrews --- Department of Agronomy,Fourteen sorghum inbred lines and one sorghum variety were evaluated for qualitative parameters relating to milling quality. Grain hardness, flour yield, flour particle size and alkali water retention capacity criteria were measured. These quality criteria directly influence acceptability of newly... -
Ceramic suction samplers: A reliable method for extracting soil solutions for analysis
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L. Grobler --- Department of Plant Production and Soil Science, South Africa A.S. Claassens --- Department of Plant Production and Soil Science, South Africa J.G. Annandale --- Department of Plant Production and Soil Science, South AfricaCeramic samplers are used to extract soil solutions at different depths from the soil profile for chemical analysis. The advantage of this method is that samples can be taken at any time provided that the soil water potential is high... -
Possible flood irrigation technologies to reduce water use of Sultanina grapevines in a hot, arid climate
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , South AfricaGrowth, production and water use efficiency of Sultanina grapevines irrigated by means of methods where only a fraction of the soil was wetted, were compared to full surface flood irrigation in the hot, arid Lower Orange River region of South... -
Plant water relations and proline accumulation on two cowpea (Vigna unguiculata (L.) Walp.) cultivars as a response to water stress
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: R.M. Chiulele --- Department of Agronomy, South Africa G.A. Agenbag --- Department of Agronomy, South AfricaCowpeas produced under rainfed conditions of arid and semiarid areas of Sub-Saharan Africa often experience periods of water stress. It is therefore important to identify drought tolerant cultivars of cowpeas and the mechanisms involved in their ability to withstand these... -
The breaking of seed dormancy of guayule (Parthenium argentatum Gray.) by treatment with gibberellic acid and smoke water solution
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.R. Bekaardt --- , South Africa P.J. Pieterse --- Department of Agronomy, South Africa J.H. Coetzee --- , South Africa G.A. Agenbag --- Department of Agronomy, South AfricaGuayule seed exhibits poor germination due to natural dormancy that can last from six- to twelve months after seed-set. In an attempt to stimulate seed germination, four guayule seed lines (AZ101, AZ-3, N565 and 11591) were treated with smoke water... -
Modelling the contribution of root accessible water tables towards crop water requirements
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.Z. Jovanovic --- Department of Earth Sciences, Republic of South Africa L. Ehlers --- Department of Soil, Republic of South Africa A. T.P. Bennie --- Department of Soil, Republic of South Africa C.C. Du Preez --- Department of Soil, Republic of South Africa J.G. Annandale --- Department Plant Production and Soil Science, Republic of South AfricaProper utilization of shallow water tables could substantially reduce irrigation water requirements in large agricultural areas. The objective was to develop and test a computer model for predicting the contribution of shallow water tables to root water uptake. The model... -
The relationship between soil morphology and soil water regime: preliminary results in the Weatherley catchment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- Department of Soil, Crop and Climate Sciences, Republic of South Africa P. A.L. le Roux --- Department of Soil, Crop and Climate Sciences, Republic of South Africa M. Hensley --- Department of Soil, Crop and Climate Sciences, Republic of South AfricaSoil water contents were measured for five years at Weatherley, an intensively instrumented catchment in the north eastern part of the Eastern Cape Province. Soil water contents are expressed in terms of average duration of saturation with water above 0.7... -
Water use of maize in response to planting density and irrigation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. B.O. Ogola --- Department of Plant Production, South Africa T.R. Wheeler --- Department of Agriculture, UK P.M. Harris --- Department of Agriculture, UKThis study aimed to quantify the effect of plant population density and irrigation on the water use efficiency (q) of maize crops, with particular emphasis on the partitioning of water use into transpiration (T) and direct evaporation of water from... -
Leaf yield of Amaranthus hypochondriatus L. (Imbuya), affected by irrigation systems and water quality
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.M. Sedibe --- , N. J. J. Combrink --- Dept. of Agronomy, E.Y. Reinten --- ,Family scale vegetable production should be enhanced in rural areas in order to prevent vitamin A deficiencies. A soil-less water-use-efficient ‘Ebb-and-Flood’ production system, developed for areas with limited water resources, was compared with two conventional soil irrigation systems, using Amaranthus... -
Protein concentration in response to water stress in Themeda triandra Forsk
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: I.B. Oosthuizen --- Department of Animal, H.A. Snyman --- Department of Animal, J.C. Pretorius --- Department of Soil, Crop and Climate Sciences, South AfricaThe influence of water stress on the concentration of water-soluble protein growth reserves was determined during three growth stages (vegetative, pipe and reproductive) as well as in three plant parts (roots, stubble and leaves) for the indigenous C4 semi-arid grass... -
Determination of the timing and amount of irrigation of winter cover crops with the use of dielectric constant and capacitance soil water content profile methods
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.F. Gebregiorgis --- Soil-Plant-Atmosphere Continuum Research Unit, South Africa M.J. Savage --- Soil-Plant-Atmosphere Continuum Research Unit, South AfricaA well-managed irrigation scheduling system needs a rapid, precise, simple, cost-effective and non-destructive soil water sensor that allows for measurements at different depths and different locations across the cropped area. Two soil water content profile measurement methods were used and... -
Evaluating the maize production potential of a semi-arid ecotope with four production techniques
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.B. Zere --- Department of Soil, South Africa C.W. Huyssteen --- Department of Soil, South Africa M. Hensley --- Department of Soil, South AfricaWater conservation production techniques are needed to boost crop production in semi-arid areas. The in-field rainwater harvesting (IRWH) technique has been developed for this purpose, and found to be successful on clay and duplex soils, but has not yet been... -
The effect of fertiliser N rates on growth of perennial ryegrass (Lolium perenne) and white clover (Trifolium repens) grown at high soil water levels under controlled conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Labuschagne --- , South Africa G.A. Agenbag --- , South AfricaThe response of perennial ryegrass and white clover to fertiliser N rates of 0, 30, 60, 120 and 180 kg N ha−1 when grown at soil water potentials of-10, −20, −25 and −35 kPa were investigated. Increasing fertiliser N levels... -
Water and nutrient retention by Aquasoil® and Stockosorb® polymers
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.G. Ghebru --- Department of Plant Production and Soil SCience, South Africa E.S. du Toit --- Department of Plant Production and Soil SCience, South Africa J.M. Steyn --- Department of Plant Production and Soil SCience, South AfricaWater retention and hydration rate of Aquasoil and Stockosorb polymers, the effects of these polymers on the water, ammonium and nitrate retention of a pine bark growth medium and the response of the polymers to fertilizer solutions were investigated. Aquasoil... -
Predicting the effects of nitrogen and planting density on maize water use in semi-arid Kenya
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. B.O. Ogola --- Department of Plant Production, South Africa T.R. Wheeler --- Department of Agriculture, U.K. P.M. Harris --- Department of Agriculture, U.K.Models are important tools to assess the scope of management effects on crop productivity under different climatic and soil regimes. Accordingly, this study developed and used a simple model to assess the effects of nitrogen fertiliser and planting density on... -
Duration of water saturation in selected soils of Weatherley, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- Department of Soil, South Africa P. A.L. le Roux --- Department of Soil, South Africa M. Hensley --- Department of Soil, South Africa T.B. Zere --- Department of Soil, South AfricaSoil water contents were measured weekly for six years (1997–2005) in the Weatherley catchment in the northern Eastern Cape Province of South Africa, and used to calculate average duration of water saturation above 70% of porosity (ADs>0.7). Data were used... -
Variability among barley landraces in response to waterlogging stress in the greenhouse
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Assefa --- Sheno Research Center, Ethiopia M.T. Labuschagne --- Department of Plant Sciences, South AfricaBarley production, in some parts of the Ethiopian central highlands, is constrained by seasonal waterlogging. The aim of this study was to investigate differences in growth, nutrient uptake and concentration under waterlogging stress between landraces varying in tolerance. A three... -
Evapotranspiration of Vitis vinifera L. cvs Sunred Seedless and Muscat Supreme in response to soil water depletion and irrigation cutoff during berry ripening
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.A. Myburgh --- , South Africa C.L. Howell --- , South AfricaThe effects of soil water depletion and irrigation cutoff during ripening on yield, quality and evapotranspiration (ET) of table grapes were studied to refine irrigation strategies needed during hot, dry summers. Six irrigation treatments were applied to two cultivars, viz... -
Comparison between traditional and scientific irrigation scheduling practices for furrow irrigated potatoes (Solanum tuberosum L.) in Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: EB Geremew --- Department of Plant Production and Soil Science, South Africa JM Steyn --- Department of Plant Production and Soil Science, South Africa JG Annandale --- Department of Plant Production and Soil Science, South AfricaTraditional irrigation schemes constitute about 40% of the total irrigated land in Ethiopia. Despite this, the sector has been overlooked and not supported by improved water management technologies. A survey conducted on one of the schemes, Godino, indicated that farmers... -
Measuring water stress in Pinus patula Schiede ex Schlect. & Cham. seedlings
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.A. Rolando --- , K.M. Little --- ,A pot trial was conducted to investigate measures of water stress for Pinus patula seedlings planted for commercial forestry in South Africa. The objectives were to determine the efficacy of different equipment for quantifying water stress, and the effect of... -
Wheat (Triticum aestivum L.) growth and yield response to saline irrigation water under controlled conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.B. Dikgwatlhe --- , South Africa G.M. Ceronio --- , South Africa L.D. van Rensburg --- , South AfricaSerious agronomic problems occur where saline water is used for irrigation. The effect of irrigation water salinity on wheat was investigated using electrical conductivity (ECi, mS m−1) as a salinity indicator. A pot experiment was conducted at the University of... -
Root dynamics of Themeda triandra Forsk. in relation to water stress and defoliation at different phenological stages
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: I.B. Oosthuizen --- Department of Animal, Wildlife and Grassland Sciences, South Africa H.A. Snyman --- Department of Animal, Wildlife and Grassland Sciences, South AfricaThe impact of water stress on root growth for the indigenous apomectic C4-grass species Themeda triandra was determined over a growing season covering three growth stages (vegetative, pipe and reproductive), as well as for regrowth occurring to one, three and... -
The effects of a water treatment residue on grain yield and nutrient content in seeds of common dry beans (Phaseolus vulgaris L. cv. Ghadra) grown in a dystrophic soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.W. Titshall --- , South Africa J.C. Hughes --- , South AfricaThis glasshouse study investigated the grain yield and nutrient content of seed of common dry beans (Phaseolus vulgaris L. cv. Ghadra) grown in a dystrophic sandy soil treated with 0, 50, 100, 200 and 400 g kg−1 water treatment residue... -
Physiological traits associated with drought tolerance in bread wheat (Triticum aestivum L.) under tropical conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.K. Kimurto --- Department of Crop and Soil Sciences, Kenya J.B.O. Ogola --- Department of Plant Production, South Africa M.G. Kinyua --- Department of Crop Science and Biotechnology, Kenya J.M. Macharia --- Department of Botany, Kenya P.N. Njau --- , KenyaAlthough it is generally accepted that drought tolerance is a critical agronomic trait, efficient and predictable improvement in drought tolerance in bread wheat (Triticum aestivum L.), in varying drought stress conditions, has not been fully achieved. This study aimed at... -
Soil water variability in the Weatherley grassland catchment, South Africa: I. Evapotranspiration
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CW van Huyssteen --- Department of Soil, Crop and Climate Sciences, South Africa TB Zere --- Department of Soil, Crop and Climate Sciences, South Africa M Hensley --- Department of Soil, Crop and Climate Sciences, South AfricaEvapotranspiration (ET) is a major component of the soil water balance and therefore requires accurate determination to quantify catchment water yield. Six-year daily ET was determined at 300 mm depth intervals in the root zone of 28 soil profiles in... -
Soil water variability in the Weatherley grassland catchment, South Africa: II. Soil water content
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CW van Huyssteen --- Department of Soil, Crop and Climate Sciences, South Africa TB Zere --- Department of Soil, Crop and Climate Sciences, South Africa M Hensley --- Department of Soil, Crop and Climate Sciences, South AfricaSoil water content is a major factor that affects the hydrological response of a hillslope or catchment. It is therefore important to have reliable soil water content data to estimate catchment water yield. Daily soil water content (θ) data was... -
Soil compaction under sugar cane (Saccharum hybrid sp.) cropping and mechanization in Mauritius
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.R. Ng Cheong --- , Mauritius K.F. Ng Kee Kwong --- , Mauritius C.C. Du Preez --- Department of Soil, Crop and Climate Sciences, South AfricaFarm machinery is increasingly used in sugar cane production in Mauritius and is expected to cause soil compaction. A study was undertaken to ascertain whether the five major cane-growing soil groups of Mauritius were being compacted as a result of... -
Advances in soil physics: Application in irrigation and dryland crop production
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.D. van Rensburg --- Department of Soil, Crop and Climate Sciences, South AfricaThis is the third soil physics review to be published in South African Journal of Plant and Soil. In the previous reviews the focus was broad and covered almost every aspect of the subject, providing a comprehensive list of contributions... -
Modelling crop growth and crop water relations in South Africa: Past achievements and lessons for the future
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Singels --- , South Africa J.G. Annandale --- Department of Plant Production and Soil Science, South Africa J.M. De Jager --- Department of Soil, Crop and Climate Sciences, South Africa R.E. Schulze --- , South Africa N.G. Inman-Bamber --- , Australia W. Durand --- , South Africa L.D. Van Rensburg --- Department of Soil, Crop and Climate Sciences, South Africa P.S. Van Heerden --- , South Africa C.T. Crosby --- , South Africa G.C. Green --- , South Africa J.M. Steyn --- Department of Plant Production and Soil Science, South AfricaMathematical simulation of crop growth and water relations has become indispensable to agricultural science and practice. A critical assessment of how modelling has contributed to the development of crop science and to the management of crop production and natural resources... -
Underutilised indigenous and traditional crops: why is research on water use important for South Africa?
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.R. Backeberg --- , A.J. Sanewe Water --- ,The answer to the question ‘why is research on water use important for South Africa?’ is quite straightforward: more research is needed because there is a major gap in knowledge on water use of indigenous crops. These indigenous edible plants... -
Effect of irrigation scheduling on leaf yield of non-heading Chinese cabbage
(Brassica rapa L. subsp. chinensis) Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. van Averbeke --- , C. Netshithuthuni --- ,A field experiment conducted on the Dzindi canal irrigation scheme in the north of South Africa demonstrated that non-heading Chinese cabbage (Brassica rapa L. subsp. chinensis) needed to be irrigated at least twice per week to maintain the water content... -
Photosynthetic capacity and diurnal gas exchange of ‘Brookfield Gala’ apple leaves under three irrigation systems
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.C. Lebese --- Department of Horticultural Science, South Africa P.J.C. Stassen --- , South Africa S.J.E. Midgley --- Department of Horticultural Science, South AfricaWater and nutrient application using three irrigation systems, namely daily drip irrigation, pulsing drip irrigation and micro irrigation were studied with respect to photosynthetic efficiency, water use efficiency and leaf water relations in ‘Brookfield Gala’ apple trees during 2004/5 and... -
Effect of tillage systems and nitrogen application rates on selected physical and biological properties of a clay loam soil in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: TS Taylor --- Soil Science, School of Environmental Sciences, South Africa LW Titshall --- Soil Science, School of Environmental Sciences, South Africa JC Hughes --- Soil Science, School of Environmental Sciences, South Africa GR Thibaud --- Soil and Analytical Services Division, Department of Agriculture, South AfricaThe effects of agricultural management practices on soil physical and biological parameters provide fundamental information for assessing sustainability. Tillage (annual conventional tillage and no-till) and nitrogen fertiliser (limestone ammonium nitrate at rates of 0, 100 and 200 kg N ha−1)... -
Winter cover crops effects on soil strength, infiltration and water retention in a sandy loam Oakleaf soil in Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: HA Mupambwa --- Department of Agronomy, South Africa IIC Wakindiki --- Department of Agronomy, South AfricaThere is substantial evidence that cover crops increase soil fertility and plant nutrition but the few studies concerning soil physical properties are conflicting. This study determined the effects of monocultures of vetch (Vicia dasycarpa L.), lupin (Lupinus angustifolius L.), oats... -
Relating the onset of reduction to degree of soil water saturation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Kimberly Smith --- Department of Soil, Crop and Climate Sciences, South Africa Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Sciences, South AfricaLiterature does not indicate the degree of water saturation at which reduction is expected to occur. This study therefore aimed to determine the degree of water saturation (S) at which reduction is initiated. Soil cores were packed to a bulk... -
Evaluation of soil conservation measures on a highly erodible soil in the Free State province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D Garry Paterson --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Hendrik J Smith --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Andri van Greunen --- Free State Provincial Department of Agriculture, South AfricaSoil erosion is a problem in South Africa, and is exacerbated by poor land use practices and erodible soils. Several methods are available to address the problem and a runoff trial was conducted over four rainfall seasons on an erodible,... -
Effect of shallow tillage and straw mulching on soil water conservation and grapevine response
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Philip A Myburgh --- ARC–Infruitec/Nietvoorbij, South AfricaEffects of shallow tillage and straw mulch thickness on water conservation and grapevine responses were compared to bare, untilled soil in a Sauvignon blanc/99R vineyard near Stellenbosch from 1995 to 1997. Shallow tillage to a depth of 6 cm did... -
Development of acoustic techniques for assessment of orange roughy Hoplostethus atlanticus biomass off Namibia, and of methods for correcting for bias
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. C. Boyer I. HamptonOrange roughy form dense spawning aggregations in specific small areas in deep water on the Namibian shelf between late June and early August each year. The biomass in three such areas, where most commercial fishing occurs (the Johnies, Frankies and... -
PRELIMINARY RESULTS ON THE UPTAKE AND RELEASE OF 32P BY POTAMOGETON PECTINATUS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.H. Swanepoel --- , South Africa J.F. Vermaak --- , South AfricaThe absorption and release of 32PO4, by Potamogeton pectinatus L during winter was investigated using a partitioned container in which the roots were separated from the stems and leaves. 32PO4 is absorbed by the roots as well as the stems... -
THE EFFECT OF NEUTRALIZATION OF THE ANAESTHETIC MS 222 ON FRESHWATER QUALITY
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G.L. Smit --- Department of Zoology, P. S.J. Halliday --- Department of Zoology, J. Hattingh --- Department of Zoology,This study indicates that MS 222, which is acidic in nature, causes changes in pH, pCO2 alkalinity and calcium hardness levels in tapwater and bore-holewater. Distilled water shows pH and conductivity changes whereas conductivity was not affected in boreholewater. Tapwater... -
ON THE DISSOLVED SOLIDS OF THE PONGOLO FLOOD PLAIN PANS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J. Heeg --- Pongolo Research Group, C.M. Breen --- Pongolo Research Group, P.M. Colvin --- Pongolo Research Group, H.D. Furness --- Pongolo Research Group, C.F. Musil --- Pongolo Research Group,The water retained in the Pongolo flood plain pans differs from that of the Pongolo River not only in having a higher TDS, but also in the composition of the solutes, which approximate to seawater in their equivalent ionic proportions... -
THE INFLUENCE OF P-RETENTION BY SOILS AND SEDIMENTS ON THE WATER QUALITY OF THE LIONS RIVER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: H.D. Furness C.M. BreenThe soils of Midmar dam catchment and the sediments of the Lions river are shown to have high P-retention properties. Present conditions result in little leaching of PO4 −4 from the soils and favour a net transport of P from... -
THE DETERMINATION OF CHLOROPHYLL
a IN WATER CONTAINING SEDIMENTItem type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.C. Grobler --- Department of Water Affairs, South Africa Elizabeth Davies --- Department of Water Affairs, South AfricaThe presence of sediment at concentrations of 0,2% by mass in water samples significantly lowered the amount of chlorophyll a that could be measured. Two types of sediment differed in their ability to lower the chlorophyll a concentration. The chemically... -
A LIMNOLOGICAL INVESTIGATION OF LAKE LIAMBEZI, CAPRIVI
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M.T. Seaman --- , South Africa W.E. Scott --- , South Africa R.D. Walmsley --- , South Africa B. C.W. van der Waal --- , South Africa D.F. Toerien --- , South AfricaA general investigation was carried out on Lake Liambezi to characterize the limnological features of the lake. The lake, 101 km2 in area and situated within the tropics, was found to be shallow and bordered by reed swamps, particularly on... -
FAECAL BACTERIAL CONTAMINATION OF TROUT HATCHERY WATER EFFLUENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G.R. Batchelor --- Division of Nature Conservation, South AfricaThis study was undertaken to determine the occurrence of faecal bacteria in two trout hatcheries in the Transvaal Province, South Africa. The results indicate that variations in numbers of enteric bacteria are partly caused by man-made changes to the influent... -
FRESHWATER NEMATODES FROM SOUTH AFRICA 3. TOBRILUS ANDRÁSSY, 1959
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: A.P. Joubert --- Zoology Department, South Africa J. Heyns --- Zoology Department, South AfricaDuring a survey of freshwater nematodes in South Africa, six species of Tobrilus Andrássy, 1959 were encountered. The six species, four of which are new to science, are described and figured, viz. Tobrilus annetteae, n.sp.; T. heptapapillatus n.sp.; T. stefanskii... -
EARLY OBSERVATIONS ON SOME LIMNOLOGICAL CHARACTERISTICS OF THREE ORANGE FREE STATE IMPOUNDMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.U. Grobbelaar --- , South AfricaThe first limnological investigations on three impoundments in the Orange Free State are described. No thermal stratification was found and water temperatures below 8,6°C were not measured. The waters were turbid and the unfavourable underwater light climate was the major... -
DIATOMS AS INDICATORS OF WATER QUALITY IN THE UPPER HENNOPS RIVER (Transvaal, South Africa)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: F.R. Schoeman --- , South AfricaThe water quality of the upper Hennops River was determined by applying the method of Lange-Bertalot (1978; 1979), which is based on groups of diatom species with similar tolerances towards pollution. A definite improvement in the water quality was indicated... -
THE USE OF BENZOCAINE HYDROCHLORIDE AS FISH TRANQUILLIZER AND ANAESTHETIC IN SALINE WATERS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: W.T. Barham --- Department of Zoology, South Africa K.M. Caiger --- Department of Zoology, South Africa J. G.J. Visser --- Department of Zoology, South AfricaThe anaesthetic effects of various concentrations of benzocaine hydrochloride were tested on Liza macrolepis and Sarotherodor mossambicus in sea water and diluted sea water, respectively. Induction time for anaesthesia was negatively correlated with increasing anaesthetic concentrations in L. macrolepis. -
THE DISTRIBUTION AND ECOLOGY OF TWO MULLET SPECIES IN SOME FRESH WATER RIVERS IN THE EASTERN CAPE, SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: A.H. Bok --- Department of Nature and Environmental Conservation, South AfricaData on the relative abundance, penetration and breeding biology of the freshwater mullet Mugil cephalus and the flathead mullet Mugil cephalus in the freshwater reaches of some Eastern Cape coastal rivers are described. The differences found between the two species... -
THE COMPOSITION OF WATER COLLECTED FROM THE KUISEB RIVER, NAMIB DESERT, AT GOBABEB
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: JohanU Grobbelaar --- , South Africa MaryK Seely --- , South AfricaWater from the Kuiseb River at Gobabeb varied in ionic content. Various ionic dominance orders were recorded from flooding until the pools dried up. The quality was not suitable for irrigation, but would present no problems when used by stock... -
SOME PROPERTIES OF SUSPENDED SEDIMENT ADSORBED CATIONS IN TURBID FRESHWATERS OF SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.U. Grobbelaar --- , South Africa P.C. Keulder --- , South Africa P. Stegmann --- , South AfricaLarge quantities of suspended sediments are common in many of South Africa's fresh-waters. Temporal and spatial variations in tile amounts of cations adsorbed were recorded. The adsorption appears to be dependent on valency, because greater quantities of the higher valencies... -
WATER TRANSPARENCY CHARACTERISTICS OF SOUTH AFRICAN IMPOUNDMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , South Africa C.A. Bruwer --- , South AfricaSome water transparency characteristics (Secchi disc transparency, mean diffuse light attenuation coefficient and turbidity) of a number of South African impoundments are compared. In general most impoundments may be considered to be highly turbid; for 92 impoundments considered in this... -
CHEMICAL PROPERTIES OF WATER-HOLES IN THE KUISEB RIVER CANYON, NAMIB DESERT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: O.B. Kok --- Department of Zoology, South Africa J.U. Grobbelaar --- Department of Zoology, South AfricaFive water-holes in the Kuiseb River Canyon, Namib Desert, were monitored over a three month period during the 1977/78 dry season. Apart from the pronounced dominance of Ca(HCO3)2 in the water taken from a gorra (water-hole excavated by animals), the... -
THE PLASMA PROTEINS OF SOME FRESHWATER FISH IN THEIR NATURAL ENVIRONMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J. H.J. van Vuren --- Division of Nature Conservation, South AfricaThe plasma proteins of Cyprinus carpio (carp), Barbus holubi (yellowfish), Labeo umbratus (mudfish) and Labeo capensis (mudfish) were electrophoretically separated on polyacrylamide gels from blood samples obtained from specimens sampled during summer and winter in three different localities. Within a... -
ADDITIONS TO THE CHECKLIST AND RECENT CHANGES TO THE SCIENTIFIC NAMES OF SOUTHERN AFRICAN FRESHWATER FISHES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.H. Skelton --- , South Africa R.A. Jubb --- , South Africa M.N. Bruton --- , South AfricaAlterations and additions to the checklist of southern African freshwater fishes are given based on recent findings and the latest literature. Name changes are given for 13 taxa, and 25 species and subspecies are added to the list. Several species... -
EFFECT OF CATTLE DIP CONTAINING TOXAPHENE ON THE FAUNA OF A SOUTH AFRICAN RIVER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.M. Brooks --- , South Africa B.D. Gardner --- , South AfricaIn August 1978 the Hluhluwe River, which runs through the Hluhluwe Game Reserve (Natal, South Africa), was polluted by toxaphene from a cattle dip tank. Faunal surveys were conducted to determine the impact of the insecticide on the fish and... -
QUALITY AND NUTRIENT RELEASE OF POULTRY MANURE IMMERSED IN WATER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: O.V. Msiska --- Ministry of Forestry and Natural Resources, Fisheries Department, MalawiAttempts aimed at establishing a sound basis for the frequency of manure inputs into fish pond water showed that the greater bulk of mineral release occurs within 72 hours of immersion into water. Elemental composition of the poultry manure revealed... -
ADDITIONS TO THE CHECKLIST OF SOUTHERN AFRICAN FRESHWATER FISHES AND A GAZETTEER OF SOUTH-WESTERNANGOLAN COLLECTING LOCALITIES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M.J. Penrith --- , South West AfricaAn additional 13 species of freshwater fishes recorded from south-western Angola, mainly from the Cunene Basin, are added to the checklist of southern African freshwater fishes, including five species of marine origin permanently resident in the fresh water of the... -
VALUES FOR THE FIRST AND SECOND APPARENT DISSOCIATION CONSTANTS, K'1 & K'2 OF CARBONIC ACID FOR ESTUARINE AND BRACKISH WATERS AS A FUNCTION OF TEMPERATURE AND CHLORINITY
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. Allanson --- Institute for Freshwater Studies, Department of Zoology and Entomology, Republic of South Africa C. Duncombe Rae --- Institute for Freshwater Studies, Department of Zoology and Entomology, Republic of South Africa -
NOTES ON THE AVAILABILITY AND CHEMICAL COMPOSITION OF WATER FROM THE GRAVEL PLAINS OF THE NAMIB-NAUKLUFT PARK
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: O.B. Kok --- Department of Zoology, J.U. Grobbelaar --- Department of Zoology,Data are presented on the occurrence of a surprising number of permanent water sources on the gravel plains of the Namib-Naukluft Park, South West Africa. As a consequence, no game animal is further than ca 25 km away from the... -
EFFECT OF PROGRAMMED CIRCADIAN TEMPERATURE FLUCTUATIONS ON POPULATION DYNAMICS OF BULINUS TROPICUS (KRAUSS) AND LYMNAEA NATALENSIS KRAUSS (GASTROPODA: MOLLUSCA)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: K.N. de Kock --- Department of Zoology, South AfricaUntil now all life-table studies on Bulinus tropicus (Krauss) and Lymnaea natalensis Krauss involving temperature as the variable factor have been conducted at constant temperatures. This study evaluates the effect of programmed, circadian temperature fluctuations, ranging from 18 to 28... -
EFFECT OF CONSTANT TEMPERATURE ON POPULATION DYNAMICS OF BULINUS TROPICUS (KRAUSS) AND LYMNAEA NATALENSIS KRAUSS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: K.N. de Kock --- Snail Research Unit of the South African Medical Resesrch Council, South Africa J.A. van Eeden --- Snail Research Unit of the South African Medical Resesrch Council, South AfricaLife-tables were compiled for cohorts of the two freshwater snail species Bulinus tropicus (Krauss) and Lymnaea natalensis Krauss at six different constant temperatures from 17 to 32 °C under identical conditions of crowding, feeding and chemical composition of the water... -
NUTRIENT CYCLING IN MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P. Chapman --- , South AfricaThe overall cycles of nitrogen, phosphorus and silicon in the sea are described and compared. Data on the fluxes and rates of change between various pools of each nutrient are given, where available, and gaps in knowledge are pointed out... -
ZOOPLANKTON AND ESTUARINE RELICT (BENTHIC) FAUNA IN LAKE MZINGAZI, A FRESHWATER COASTAL LAKE OF NATAL
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.K. Fowles --- , South Africa C. G.M. Archibald --- , South AfricaLake Mzingazi, a natural, undisturbed freshwater coastal lake in the heart of the Richards Bay municipal area, is threatened by rapid urban and industrial growth. The previously unrecorded composition and distribution of zooplankton in the lake was studied during 1979... -
THE USE OF MICROCOMPUTERS IN WATER RESOURCE MODELLING
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: W. J.R. Alexander --- Department of Civil Engineering,Microcomputers are the ideal tool for water resource modelling. Not only are they fast and computationally efficient, but they can also provide the user with dynamic graphical displays which greatly assist in the interpretation of the results of the analyses... -
WATER QUALITY MODELLING PERCEPTIONS OF A WATER RESOURCE MANAGEMENT ORGANIZATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: H.D. Furness --- Scientific Services Division, South Africa W.N. Richards --- Scientific Services Division, South AfricaThe use of models by the South African water industry is discussed. It is suggested that climatic conditions and existing legislation have influenced the formulation of models. Future model requirements by the water Industry are outlined. Changes are suggested which... -
FUTURE CHALLENGES IN WATER QUALITY MODELLING WITH PARTICULAR REFERENCE TO OPERATIONALLY CLOSED CATCHMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: S.F. Forster --- Department of Water Affairs, South Africa F.A. Stoffberg --- Department of Water Affairs, South Africa J.A. van Rooyen --- Department of Water Affairs, South AfricaAs a result of the declining quality of many water sources, the use of water quality models in planning is increasing. To date applications have involved the simulation of total dissolved salts and nutrients, largely in catchments affected by urban... -
ASPECTS OF EUTROPHICATION MANAGEMENT IN TROPICAL/SUB-TROPICAL REGIONS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.A. Thornton --- , South AfricaIn 1981, the UNESCO in association with the IIASA and OECD recognized that tropical/-sub-tropical water bodies may respond differently to eutrophication management techniques than heretofore expected on the basis of temperate lake studies. However, little information on the eutrophication process... -
DISTRIBUTION AND ABUNDANCE OF THE BENTHOS IN THE SEDIMENTS OF LAKE CUBHU: A FRESHWATER COASTAL LAKE IN ZULULAND SOUTH AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.P. Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa T.J. Martin --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaA preliminary investigation of the macrobenthic invertebrates of the sediments of Lake Cubhu, a freshwater coastal lake near Richards Bay was conducted on a quarterly basis during 1987. The most important factor which determined the abundance and distribution of each... -
AN EVALUATION OF BABY FISH FOOD AS A SUITABLE DIET FOR THE FRESHWATER SNAIL, BIOMPHALABIA GLABRATA (SAY)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.H. Joubert --- Research Institute for Diseases in a Tropical Environment, South Africa K.N. de Kock --- Research Institute for Diseases in a Tropical Environment, South AfricaTetra Kin Baby Fish Food ‘E’ for Egglayers (Tetra ‘E’) was evaluated as a possible nutrient for the laboratory culture and maintenance of pigmented and unpigmented Biomphalaria glabrata (Say). Growth was monitored weekly by determining shell diameter and mass. The... -
FRESHWATER MOLLUSC STUDIES - A PERSONAL EXPERIENCE
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: S.J. Pretorius --- , South AfricaMy contribution reviews some of the research activities of the Snail Research Unit. Taking Unit. Taking some liberties on the chronological order, the transition is traced from the species descriptions of the early years, the extensive field surveys, laboratory experimentations,... -
A QUARTER CENTURY OF GREAT LAKES RESEARCH IN AFRICA
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: DavidH. Eccles --- , United KingdomThe African Great Lakes differ from shallower large African lakes by undergoing seasonal stratification and from large reservoirs in having long residence times, so that the ionic concentration of the lake water differs substantially from that of the inflows. -
DISTRIBUTION AND DIVERSITY OF MKUZE SWAMP FISHES DURING A SUMMER FLOOD
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: PH Skelton --- , South Africa AK Whitfield --- , South Africa N P E James --- , South AfricaVery little information is available on the fishes of the Mkuze swamps and this paper presents the results of an ichthyofaunal survey conducted in March 1988. The study, which coincided with a major river flood, determined that the fish fauna... -
PHYSICAL, CHEMICAL AND BIOTIC RESPONSES TO DECREASING WATER DEPTH IN A HIGHVELD PAN FOLLOWING WET AND DRY SUMMERS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: KH Rogers --- Department of Botany, WN Ellery --- Department of Botany, NL Winternitz --- Department of Botany, R Dohmeier --- Department of Botany,The classification of highveld pans by Geldenhuys (1982) emphasized the spatial diversity of morphology, vegetation and fauna. However, since the characteristics of individual pans also change seasonally and over longer term wet/dry cycles, he called for more detailed limnological studies... -
SUITABILITY OF TROPICAL FISH FOODS FOR LABORATORY CULTURE OF FOUR SPECIES OF FRESHWATER SNAILS ACTING AS INTERMEDIATE HOSTS FOR ECONOMICALLY IMPORTANT HELMINTH PARASITES IN SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: K.N. de Kock --- Department of Zoology, South Africa P.H. Joubert --- , South AfricaFour different kinds of tropical fish food from Tetra Werke, West Germany, as well as a mixture of two of these, were evaluated as possible nutrients for the laboratory culture and maintenance of four freshwater snail species of economic importance... -
Pitfalls in the Presentation of Chemical Data
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J.A. Day --- Zoology Dept, South AfricaBiologists in the aquatic sciences are often guilty of numerous errors in the presentation of their chemical data. This paper reviews the use of units in the representation of the inorganic constituents of aquatic solutions for their benefit. It explains... -
Fish Collections Taken from a Small Agricultural Water Withdrawal Site on the Groot River, Gamtoos River System, South Africa
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: J.A. Cambray --- , South AfricaPeriodic water releases from Beervlei Dam on the Groot River of the Gamtoos River System were planned to flush the riverine pools of brack water and replace the pools with better quality water which was used to flood irrigate lucerne... -
GEOGRAPHICAL TRENDS IN THE WATER CHEMISTRY OF WETLANDS IN THE SOUTH-WESTERN CAPE PROVINCE, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: M.J. Silberbauer --- Department of Water Affairs, South Africa J.M. King --- Freshwater Research Unit, Zoology Department, South AfricaAlthough it is becoming increasingly important for the aquatic chemistry of wetlands to be understood, little chemical information is available for the wetlands of South Africa. During a project aimed at beginning to redress this gap in our knowledge, conductivity... -
NEW DISTRIBUTION RECORDS FOR CLARIAS THEODORAE WEBER 1897, BARBUS EUTAENIA BOULENGER 1904, BARBUS POLYLEPIS BOULENGER 1907 AND OPSARIDIUM ZAMBEZENSE (PETERS 1852) FROM THE WATERBERG, TRANSVAAL, SOUTH AFRICA.
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: C.J. Kleynhans --- , South Africa A. Hoffman --- , South AfricaNew distribution records for four fish species in the Waterberg mountains of the Transvaal were established during surveys since 1987–92. Clarias theodorae was previously reported from one locality each in the Waterberg and Soutpansberg. The current survey disclosed its presence... -
DIET AND REPRODUCTIVE ACTIVITY OF THE ESTUARINE ROUNDHERRING GILCHRISTELLA AESTUARIA IN CUBHU, A FRESHWATER COASTAL LAKE IN NORTHERN NATAL, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D.P. Cyrus --- Coastal Research Unit of Zululand, Department of Zoology, South Africa E.C. Wellmann --- Coastal Research Unit of Zululand, Department of Zoology, South Africa T.J. Martin --- Coastal Research Unit of Zululand, Department of Zoology, South AfricaA study of the diet and reproductive activity of Gilchristella aestuaria revealed that active gonads were present throughout the year. The main breeding season appeared to be from spring through to autumn with two distinct peaks occurring from August to... -
AN HOLISTIC APPROACH TO THE MANAGEMENT OF WATER QUALITY IN FALSE BAY, CAPE TOWN, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: A. J.R. Quick --- Town Planning Branch, Cape Town City Council, South AfricaAn overview of the water quality status of False Bay identified the bacterial/viral water quality of stormwater and rivers discharging near contact recreation beaches to be the management concern of highest priority. A second water quality concern is the potential... -
CHANGES IN URBAN RESIDENTIAL LAND IN THE RIETSPRUIT CATCHMENT, SOUTHERN TRANSVAAL
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: M.J. Silberbauer --- Department of Water Affairs, South Africa J. Moolman --- Department of Water Affairs, South AfricaInformal settlements have become an important and rapidly-expanding component of urban development in South Africa. In the Rietspruit catchment, south-west of Johannesburg, average growth rates in urban land cover of up to 2.7 km2 per year (1972–1991) were measured from... -
THE USE OF TOXICITY TESTING IN EFFLUENT REGULATION AND CONTROL: A NEW DIMENSION TO ASSESSMENT AND MANAGEMENT OF WATER QUALITY IN SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D.J. Roux --- , South AfricaEfficient management tools are continually required to cope with increasing demands placed on the quality and quantity of aquatic resources. Recent developments in environmental monitoring indicate the importance of incorporating biological indicators in assessment programmes. Aquatic toxicology has consequently become... -
FURTHER COMMENT ON THE RESPONSE OF EASTERN CAPE PROVINCE ESTUARIES TO VARIABLE FRESHWATER INFLOWS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B.R. Allanson --- , South Africa G. H.L. Read --- , South AfricaRiver flow patterns in the Kariega, Great Fish and Keiskamma estuaries, South Africa are examined to assess the impact variation in flow has upon the delivery of inorganic nutrients, total organic carbon, primary productivity and the heterotrophic components, bacteria and... -
SOME OBSERVATIONS ON FISH MIGRATIONS IN CAPRIVI, NAMIBIA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B. C.W. van der Waal --- , South AfricaLongitudinal and lateral migrations of freshwater fish were observed in 63 (83%) of the fish of the Upper Zambezi in the Caprivi region, Namibia. The results of 20 surveys showed that longitudinal upstream migrations were undertaken by most small cyprinids,... -
A COMPARISON OF THE FOOD SOURCES OF STONEFLIES (PLECOPTERA) FROM AN OPEN-AND A CLOSED-CANOPY HEADWATER STREAM IN SOUTH AFRICA USING STABLE-ISOTOPE TECHNIQUES
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: E. Reynolds --- , , South Africa C. de Villiers --- , , B. R. Davies --- , , South AfricaThe effects of different local food resources on the diets of some filipalpian stonefly nymphs (Aphanicerca spp.) were investigated. Animals from two headwater reaches, one primarily allochthonously driven and the other an open-canopied autochthonous-based system were compared. However, gut and... -
A PRELIMINARY EVALUATION OF ASPECTS OF SASS (SOUTH AFRICAN SCORING SYSTEM) FOR THE RAPID BIOASSESSMENT OF WATER QUALITY IN RIVERS, WITH PARTICULAR REFERENCE TO THE INCORPORATION OF SASS IN A NATIONAL BIOMONITORING PROGRAMME
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: H. F. Dallas --- , , South AfricaThe rapid bioassessment method, SASS (South African Scoring System) has been developed to assess water quality in riverine ecosystems. It is a scoring system based on the presence or absence of macroinvertebrate groups, and yields three values, namely SASS4 Score,... -
PRELIMINARY OBSERVATIONS ON THE FISH POPULATIONS OF THE RECENTLY-IMPOUNDED KATSE RESERVOIR, LESOTHO
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D. Tweddle --- , South Africa M. T.T. Davies --- , , South AfricaKatse is a new 35 km long impoundment on the Malibamatso River, a highland tributary of the Orange River in Lesotho. Two fishing surveys in 1996 yielded Barbus aeneus, Labeo capensis, Oncorhynchus mykiss and the occasional Austroglanis sclateri. Length frequency... -
A LIMNOLOGICAL PROFILE OF THE UPPER OKAVANGO DELTA AT LOW WATER LEVEL
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: Rob C. Hart --- ,Selected limnological attributes of the Okavango Delta panhandle were measured during a brief summer survey of “open-water” habitats extending from the permanent mainstream channel, through contiguous off-channel lagoons and still backwaters, to seasonally isolated floodplain lagoon and temporary pool biotopes... -
THE EFFECT OF SEASON ON A BIOTIC WATER QUALITY INDEX: A CASE STUDY OF THE YELLOW JACKET AND MAZOWE RIVERS, ZIMBABWE.
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B. Gratwicke --- , , ZimbabweThe effect of season on the South African Scoring System (SASS) biotic index for rapid assessment of water quality using benthic macroinvertebrates was investigated using the Yellow Jacket and Mazowe Rivers in Zimbabwe as a case study. Several impacts in... -
FRESHWATER FISH OF THE ADDO ELEPHANT NATIONAL PARK
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: I. A. Russell --- , South AfricaThis study aimed to determine the distribution and relative abundance of freshwater fish in the Addo Elephant National Park. A total of 1578 fish specimens of 12 species were collected during surveys carried out in the Sundays River and four... -
THE STATE OF KNOWLEDGE OF WATER QUALITY AND MAJOR BIOTIC COMPONENTS OF THE MHLATHUZE ESTUARY
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D. P. Cyrus --- , , South AfricaThis note briefly introduces the concept of the Environmental Reserve of the New Water Act as well as the set of papers hereafter which deal with specific components of the ecology of the Mhlathuze Estuary. These were prepared for an... -
COMMENTS ON THE WATER QUALITY OF THE MHLATHUZE ESTUARY IN RELATION TO DETERMINING THE ECOLOGICAL INTEGRITY CLASS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: V. Wepener --- , , South Africa L. A. Vermeulen --- , , South AfricaWater quality forms an integral component of the determination of the Ecological Reserve of a water resource. This paper presents the available historical and current information on the water quality of the Mhlathuze estuary, The data were assessed in order... -
A REVIEW OF THE ICHTHYOFAUNA OF THE MHLATHUZE ESTUARY
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: S. P. Weerts --- , , D. P. Cyrus --- , ,The fish fauna of the Mhlathuze estuary was reviewed making reference to surveys dating from 1948 to 1997. The concept of Estuarine Dependence Category was employed to describe species affinities with the marine, estuarine and freshwater environments. -
A REVIEW OF THE MACROBENTHIC FAUNA OF THE MHLATHUZE ESTUARY: SETTING THE ECOLOGICAL RESERVE
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: C. F. Mackay --- , , South Africa D. P. Cyrus --- , , South AfricaThis paper reviews historical and current ecological information on macrobenthos from the Mhlathuze Estuary before and after development of the Richards Bay Harbour. The fauna is described in terms of the potential influence of a change in freshwater inflow to... -
Fire and the dynamics of a semi-arid grassland: influence on soil characteristics
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: H A SnymanThe short-term impact of fire burning with the wind (head fire) and against the wind (back fire) on soil characteristics (soil-water content, soil compaction, soil temperature, organic matter, pH, exchangeable Ca, Mg, K, Na and extractable P) were determined in... -
Impact of water stress on growth reserves and re-growth of Themeda triandra (Forssk) following defoliation
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: I B Oosthuizen H A SnymanThe influence of water stress and defoliation on the concentration of total non-structural carbohydrates (TNCC) and water-soluble protein (WSPC) as growth reserves after defoliation were determined in the indigenous C4 semi-arid grass species Themeda triandra during three growth stages (vegetative,... -
Soil seed bank evaluation and seedling establishment along a degradation gradient in a semi-arid rangeland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: HA SnymanThe effects of rangeland degradation on the size and species composition of the seed bank and seedling establishment in the field were quantified over a two year period (2000–2001 and 2001–2002 growing seasons). Soil seed bank sampling was carried out... -
Factors affecting in sacco dietary degradation by Ankole cattle grazing natural range pastures in Uganda
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: S Okello EN Sabiiti HJ SchwartzThe in sacco disappearance of dietary dry matter after 48h of incubation in the rumen (DMd) was examined for its relationship with seasonal changes in neutral detergent fibre (NDFd), crude protein (CPd), cellulose (CELL), hemicellulose (HCELL), acid detergent lignin (ADLd)... -
Short-term response of burnt grassland to defoliation in a semi-arid climate of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: HA SnymanThe impact of defoliation on the productivity and soil temperature of burnt grassland (head and back fires) was investigated over the short term (one and two growing seasons after burning). Head fires had greater flame height and rate of spread... -
Dry matter yield and water use efficiency of five perennial subtropical grasses at four levels of water availability
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: D Marais N Rethman J AnnandaleThe effect of four levels of water availability on the yield and water use efficiency (WUE) of five subtropical perennial grasses was evaluated in a small plot trial under a rain shelter. The soil profiles were brought to 100% (W4... -
Species/defoliation/drought interactions on tuft survival and tiller and phytomass production in four sourveld grass species in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JCO du Toit --- Discipline of Grassland Science, South AfricaProductivity and mortality of grass plants following drought may be controlled by interactions between defoliation and severity of the drought. Prudent grassland management might mitigate deleterious changes in species composition in multispecies grasslands. This study, conducted in a horticultural tunnel,... -
The effect of defoliation during wilting on the production of Themeda triandra and Eragrostis lehmanniana in semi‐arid grassland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: H.A. Snyman --- Department of Pasture Science, Republic of South AfricaThe effect of defoliation during wilting on the production of Themeda triandra and Eragrostis lehmanniana was studied over four years (1977 to 1980). Defoliation whilst the plants were at temporary wilting point in the early growing season (before 1 January)... -
Dry matter and nonstructural carbohydrate content as quality parameters in a Lolium multiflorum breeding programme
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J.P. Marais --- , Republic of South Africa M. de Figueiredo --- , Republic of South Africa D.C.W. Goodenough --- Agricultural Research Council, Republic of South AfricaA Lolium multiflorum cv. Midmar pasture and ninety individual plants (both Italian and Westerwolds types), from 15 different Lolium multiflorum cultivars in a spaced‐plant trial, were assessed for total nonstructural carbohydrate (TNC) content, TNC yield, dry matter (DM) content, DM... -
Evapotranspiration, water‐use efficiency and quality of six dryland planted pasture species and natural vegetation, in a semi‐arid rangeland1
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: H.A. Snyman --- Department of Grassland Science, Republic of South AfricaHydraulic, non‐floating lysimeters were used to determine evapotranspiration (Et) and water‐use efficiency (WUE) of several dryland planted pasture species over a period of three years. The species were Anthephora pubescens, Cenchrus ciliaris, Chloris gayana, Digitaria eriantha subsp. eriantha, Eragrosiis curvula... -
Spring and autumn nitrogen fertiliser effects, with and without phosphorus, potassium and sulphur, on dairy pastures: Pasture nutritive value and mineral content
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: F.R. McKenzie --- Department of Natural Resources and Environment, Australia J.L. Jacobs --- Department of Natural Resources and Environment, Australia M. Ryan --- Department of Natural Resources and Environment, Australia G. Kearney --- Department of Natural Resources and Environment, AustraliaExperiments were conducted at three sites to examine effects of applying different nitrogen (N) fertilisers at 45 kg N ha−1, with and without phosphorus (P), potassium (K) and sulphur (S) on dairy pasture nutritive value and mineral content in autumn... -
Comparative investigation of physiological responses of field-grown alfalfa and tall fescue to cutting under different water regimes
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M Lazaridou --- Department of Forestry, Greece P Kostopoulou --- School of Forestry and Natural Environment, Greece M Karatassiou --- School of Forestry and Natural Environment, Greece G Merkouropoulos --- Centre for Research and Technology Hellas, GreeceAn important consideration in designing and managing forage systems is the knowledge of the physiological response mechanisms to cutting, especially when water deficit conditions are prevailing. The objective of this study was to determine the physiological response of Medicago sativa... -
Quantification of the soil-water balance under different veld condition classes in a semi-arid climate
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: H.A. SnymanThe monthly herbage production, water-use efficiency (WUE: above-ground phytomass production per unit of evapotranspiration), surface runoff and soil loss were determined on grassland in three different ecological conditions, viz. poor, moderate and good, over a four year (1995/1996 to 1998/1999)... -
A comparison of different planting methods, including hydrogels, and their effect on eucalypt survival and initial growth in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: PaulW.M. Viero KeithM. LittleResearch to minimize mortality and enhance early growth during the re-establishment of eucalypts includes the use of optimum growing stock and planting techniques, the application of adequate volumes of water at planting (where appropriate), correct fertilizer application and placement, and... -
Water use efficiency in South African Eucalyptus plantations: A review
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: PeterJ. Dye --- Faculty of Science and Agriculture,The relation between rainfall and Eucalyptus stem growth is investigated using data recorded at three ICFR espacement trials in kwaZulu-Natal. These data show that, for a given rainfall amount, large differences in stem growth may occur at different sites. The... -
The sublethal effects of zinc at different water temperatures on selected haematological variables in Oreochromis mossambicus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PP Buthelezi V Wepener DP CyrusTrace metals such as zinc play an important role in the normal metabolic functioning of all organisms. However, metals can become toxic if background concentrations are exceeded in the environment. This study investigated the sublethal effects of zinc on the... -
Some aspects of the ecology of the Groot Letaba River in the Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Vlok JS EngelbrechtThe aim of this pilot study was to evaluate the current ecological status of the Groot Letaba River and to compare this information with historical data. The objective was to determine the effects of various impacts on the fish populations... -
Developing a protocol for managing the biophysical condition of a water management area: the Sabie catchment case study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: E van Wyk J Jaganyi B van Wilgen C Breen K Rogers D Roux F VenterRecent modification of the South African Water Law spells out fundamental changes for the way the country's water resources will be managed in the future. One of the most significant mandates is the establishment of Catchment Management Agencies (CMAs) and... -
Catchments as conservation units for riverine biodiversity
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ WishartThe geological structure and longitudinal nature of river systems provide a possible barrier to the dispersal of lotic organisms. This has the potential to drive evolutionary processes such as genetic differentiation and subsequent allopatric speciation. In the conservation of lotic... -
Aftermath of simultaneous toxic spills in the Klein Nyl River, Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Jooste L PollingIn late August 1998, a mechanical malfunction at the Nylstroom Sewage Treatment Works resulted in a massive quantity of untreated sewage flowing into the Klein Nyl River. Simultaneously, 5km upstream, a poly-aromatic hydrocarbon poison was simultaneously leaked into the same... -
Potential environmental impacts associated with the proposed abstraction of water from the Okavango River in Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P AshtonThe Namibian Department of Water Affairs has in the past faced considerable pressure to relieve the water shortages caused by recent droughts. One of the options considered in 1996, following poor runoff during the 1994/95 and 1995/96 seasons, was a... -
Groundwater quality monitoring around Bass Lake, Betty's Bay, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Schachtschneider K WinterThe study involves the analysis of groundwater around Bass Lake, part of a fragile black water lake system situated along a narrow coastal plain in the southern Cape, in order to establish the quality of the water and to identify... -
The application of the Zero Emissions Research and Initiatives (ZERI) concept in an integrated industry-polyculture-farm system in Namibia: The case of Tunweni Sorghum Brewery
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DO OkeyoOne major area dealt with by the concept of Zero Emissions Research and Initiatives (ZERI) is the utilisation of huge volumes of nutrient-rich waters from household toilets, kitchen sinks and municipal and organo-industries for integrated purposes. The arrangements at the... -
The macroinvertebrates of the Cunene River from the Ruacana Falls to the river mouth and assessment of the conservation status of the river
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FC de Moor HM Barber-James AD Harrison CR Lugo-OrtizThe proposed construction of a second hydroelectric power-generating dam on the Cunene (Kunene) River on the Namibia-Angola border, more than 100km downstream of the Ruacana hydroelectric power plant, will have a major influence on the aquatic biota of this river... -
Water policy in southern Africa: A brief synopsis of some of the macro driving forces
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AR TurtonThe water sector reforms that are underway in many parts of southern Africa are a manifestation of a global phenomenon. This is rooted in the human response to the undesirable consequences of development, and seeks to introduce the notion of... -
Water — The common element: Lessons from antiquity and the health of the environment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C DickensThe chief pursuit of all aquatic science is to come to know the rules that govern aquatic systems. In this pursuit many scientists move in the direction of greater diversity, where the laws that govern ecosystem relationships become increasingly confined... -
Can small-scale fisheries contribute to poverty alleviation in traditionally non-fishing communities in South Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TG Andrew QA Rouhani SJ SetiThere has been considerable debate as to the contribution that fishing activities can make to food security and income generation in rural areas of South Africa where fishing has not traditionally been practised. The rural areas in the eastern half... -
The development of a GIS atlas of southern African freshwater fish
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LEP Scott PH Skelton AJ Booth L VerheustA geographic information systems (GIS) based atlas of southern African freshwater fish has been developed for the SADC countries. The JLB Smith Institute of Ichthyology, in collaboration with ALCOM, has developed a database of freshwater fish for this region from... -
Sublethal effects of manganese on the haematology and osmoregulation of Oreochromis mossambicus after acute exposure
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I Barnhoorn JHJ van VuurenOreochromis mossambicus were exposed for 96 hours to sublethal manganese concentrations in a continuous flow-through system. The sublethal concentrations were determined from the LC50 value of manganese (1.723mg/l), which included a 10% (172.3mg/l), 15% (259.8mg/l) and 20% (345.6mg/l) concentration of... -
Bioaccumulation of selected inorganic substances in the tissue of Oreochromis shiranus from Bunda Dam, Malawi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PP Mumba JW Banda E Kaunda C Ndamala G GhambiA study to assess and monitor the concentrations of sulphate, sodium, magnesium, calcium, chloride, iron and nitrate in Bunda Dam was carried out from May to November 1998. The same parameters, except nitrate and chloride, were also determined in the... -
The state of knowledge of water quality and major biotic components of the Richards Bay coastal lakes
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DP CyrusThis note briefly introduces the concept of the Environmental Reserve of the new Water Act as well as the set of papers that follow that deal with specific components of the four coastal lakes at the lower end of the... -
Available information on macroinvertebrates of the Mhlathuze coastal lakes: setting the ecological reserve (lake water requirements)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CF Mackay DP CyrusThis paper reviews current information on the macroinvertebrates of four coastal lakes in the Mhlathuze catchment of Zululand. The fauna are described in terms of the potential influence of lake level changes in response to increasing anthropogenic pressures for available... -
The icthyofauna of the Mhlathuze coastal lakes: some preliminary results
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SP Weerts DP CyrusThe fish faunas of the four Mhlathuze coastal lakes and the lower river comprise a diverse assortment of over fifty marine, estuarine and freshwater species. Three freshwater species are endemic to KwaZulu-Natal and nine estuarine species are endemic to southern... -
A preliminary assessment of impacts on estuarine associated fauna resulting from an intra-basin transfer and fresh water abstraction from aquatic systems in the Richards Bay area of KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D CyrusAn intra-basin transfer and the abstraction of water from aquatic systems in the Richards Bay area has led to the construction of six barriers which are restricting faunal movement, a reduction of flow to the Mhlathuze and Nhlabane estuaries and... -
An analysis of plant species distributions on the floodplain of the Okavango River, Namibia, with respect to impacts of possible water abstraction
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NJ Diederichs WN ElleryThe proposed abstraction of water from the Okavango River in Namibia could potentially result in significant changes in the vegetation of floodplains downstream of the abstraction point. Direct gradient analysis was used to determine the distribution of the most common... -
Ecological Risk Assessment in Water Resource Management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Claassen PW WadeThe US EPA published guidelines for the application of ecological risk assessment (ERA) in the USA in 1998 (US EPA 1998). The process diagram derived by Murray and Claassen (1999) in an evaluation of the US EPA framework is discussed... -
A comparison of several methods of assessing river condition using benthic macroinvertebrate assemblages
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CA BrownThis paper attempts to address some of the problems that are faced in the endeavour to minimise the time and financial costs of environmental monitoring. At the same time, it aims to assess the usefulness to freshwater studies of some... -
Beacons in the limnological landscape
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR AllansonAn overview is given of a number of major developments in the limnology of South Africa, Zimbabwe and Namibia. None was possible without the involvement of enthusiastic investigators who, over some 70 years, stimulated the growth of freshwater research in... -
The need for research and monitoring on the impacts of translocated sharptooth catfish, Clarias gariepinus, in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JA CambrayThe sharptooth catfish, Clarias gariepinus (Burchell, 1822), is a widespread African freshwater fish species which occurs naturally from the Nile to the Orange River. Through translocation aquaculturists, farmers, anglers and engineers have helped to extend its range into many South... -
The effects of lead, water hardness and pH on oxygen consumption, plas- ma chlorides and bioaccumulation in the freshwater fish Tilapia sparrmanii
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WJ van Aardt LCR VenterClosed system respirometry was performed on captive juvenile Tilapia sparrmanii exposed for 96 hours to a range of Pb-acetate concentrations in hard and soft water to determine the effect of Pb in relation to water hardness and pH. For hard... -
Hydraulic loading, stability and water quality of Nakivubo wetland, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Kyambadde F Kansiime L Gumaelius G DalhammarNakivubo wetland, which has performed tertiary water treatment for Kampala city for the past 40 years, is ecologically stressed by agricultural and infrastructural developments. Field studies were carried out to assess the hydraulic loading, pollution profile, stability and water quality... -
Physico-chemical and macrobenthic faunal characteristics of Kuramo Water, Lagos, southern Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CA Edokpayi MO Lawal NA Okwok CA OgunwenmoA five-month study in 2001 of an enclosed lagoon, Kuramo Water in southern Nigeria, exposed to urban perturbation describes its physical, chemical and macrobenthic invertebrate characteristics. Of the 16 physical and chemical conditions studied at four sites within the bank-root... -
Phosphorus sorption characteristics of sediment in the Simiyu and Kagera River basins: implications for phosphorus loading into Lake Victoria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RA TamatamahAs part of a larger study to assess the influence of land use on riverine and atmospheric phosphorus (P) loading to Lake Victoria, P sorption characteristics of eight composite bottom sediment samples from the Simiyu and Kagera rivers were determined... -
Household water sources and their contribution towards fluoride consumption in Njoro Division, Nakuru District, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Wkn MoturiFluoride is regarded as an essential element for the formation of healthy bones and teeth. However, high fluoride levels in drinking water have been associated with high incidences of dental fluorosis. A 1996–1997 study in Njoro Division, Nakuru District, established... -
Oualidia lagoon, Morocco: an estuary without a river
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Hilmi VG Koutitonsky A Orbi JI Lakhdar M ChagdaliThis study describes some physical oceanography features of an estuary maintained by fresh groundwater inflow. The mesoscale variability of currents, temperature and salinity are documented from moored current meter observations of 12 days duration at three stations. Current speeds exceeded... -
Modelling highly variable daily maximum water temperatures in a perennial South African river system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NicholasA Rivers-Moore CarelN Bezuidenhout GrahamPW JewittThirty-three months of observed hourly water temperatures were used to calculate daily maximum water temperatures for nine sites within the Sabie-Sand River system, Mpumalanga Province, South Africa. A suite of statistical models for simulating daily maximum water temperatures, of differing... -
Recommendations for the collection, preparation and enumeration of diatoms from riverine habitats for water quality monitoring in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JonathanC Taylor P Arno de la Rey Leon van RensburgDiatoms have become important organisms for monitoring freshwaters and their value has been recognised for cross-border water quality monitoring in the European Union. If South Africa is to include diatoms in the current suite of bioindicators, then thorough testing of... -
Reproductive biology of a riverine cyprinid, Labeo umbratus (Teleostei: Cyprinidae), in small South African reservoirs
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WarrenM Potts AnthonyJ Booth Thomas Hecht TimothyG AndrewThe reproductive and recruitment characteristics of moggel, Labeo umbratus, populations were examined in four small South African reservoirs. Reproduction, characterised by an extended spawning season, high fecundity, short incubation time and rapid larval development, appears to be ideally suited to... -
Primary habitats of the St Lucia Estuarine System, South Africa, and their responses to mouth management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ricky Taylor JanineB Adams Sylvi HaldorsenFour primary habitats have been identified in the St Lucia estuarine system, each having a suite of characteristic vegetation types. These can be described as follows: (1) open water; (2) intertidal shoreline; (3) 'dry' shoreline and island (i.e. those habitats... -
Distribution and habitats of Bulinus natalensis and its role as intermediate host of economically important helminth parasites in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: KennéN de Kock CorneliusT WolmaransThis article focusses on the geographical distribution and habitats of Bulinus natalensis, as reflected by the samples taken from 244 collection sites on record in the database of the National Freshwater Snail Collection (NFSC) at the Potchefstroom campus of the... -
Predictor variables for moggel (Labeo umbratus) biomass and production in small South African reservoirs
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WM Potts AJ Booth T Hecht TG AndrewThe biomass and production of moggel, Labeo umbratus, in five small previously unexploited Eastern Cape reservoirs were estimated and related to environmental conditions. Biomass and production estimates varied widely between the reservoirs. Whilst the production/biomass ratio was not a good... -
The impact of land use on water quality of the Lwiro River, Democratic Republic of Congo, Central Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M BagalwaThe water quality of the Lwiro River, Democratic Republic of Congo (DRC), Central Africa, was investigated on a monthly basis from December 1999–October 2000, at six stations along a hydraulic gradient from source to mouth, to evaluate the impact of... -
Seasonal and diurnal stratification in two small Zimbabwean reservoirs
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Tamuka Nhiwatiwa BrianE MarshallSeasonal and diurnal stratification patterns were studied in two small Zimbabwe reservoirs. The water level of the upper reservoir fluctuated more than that of the lower one and theoretical water retention times were 9 days and 3.6 days, respectively. Rainfall... -
Bioassessment of the ecological integrity of river ecosystems using aquatic macroinvertebrates: an overview with a focus on South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DeanJ Ollis HelenF Dallas KarenJ Esler Charles BoucherAn overview is given of the bioassessment of the ecological integrity of river ecosystems using aquatic macroinvertebrates, focussing on the South African situation within a global context. Biotic indices and their use in aquatic bioassessment are covered, and comparative descriptions... -
Testing the applicability of the SASS5 scoring procedure for assessing wetland health: a case study in the KwaZulu-Natal midlands, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Rebecca Bowd DonovanC Kotze CraigD Morris NevilW QuinnA study was undertaken between 29th January and 17th February 2004 to test the applicability of the South African Scoring System Version 5 (SASS5) scoring and calculation procedure in nutrient-enriched palustrine wetlands in the midlands of KwaZulu-Natal, South Africa. Four... -
Physico-chemical conditions and macroinvertebrate fauna in the River Nile from Aswan to Cairo
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Reda Fishar R Thorne W Peter WilliamsThis paper examines the distribution of benthic macroinvertebrates in relation to physico-chemical conditions along 1 035km of the River Nile from Aswan High Dam to Al Kanater Barrage, Cairo. Total Dissolved Salts and several individual chemical variables showed positive linear... -
The association between invertebrates and macrophytes in a tropical reservoir, Lake Kariba, Zimbabwe: a preliminary survey
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Lindah Mhlanga Nqobizitha SizibaThe invertebrate fauna associated with aquatic macrophytes in the littoral of Lake Kariba was studied over a three-month period in 2002. Animals from seven classes — Hirudinea, Oligochaeta, Turbellaria, Insecta, Crustacea, Bivalvia and Gastropoda — were collected. Two hirudineans, Placobdella... -
The distribution and abundance of the endangered Knysna seahorse Hippocampus capensis (Pisces: Syngnathidae) in South African estuaries
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JacquelineF Lockyear Thomas Hecht Horst Kaiser PeterR TeskeThe occurrence, distribution and abundance of the endangered Knysna seahorse Hippocampus capensis in 10 estuaries on South Africa's warm temperate south coast, were investigated. Seahorses were found only in the Knysna, Swartvlei and Keurbooms estuaries. Sex ratios were even and,... -
The life history and fishery potential of Labeo umbratus (Teleostei: Cyprinidae) in five small South African reservoirs
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WarrenM Potts AnthonyJ Booth Thomas Hecht TimothyG AndrewThe life histories of five populations of moggel, Labeo umbratus, inhabiting small Eastern Cape reservoirs were compared and the differences related to environmental parameters. A significant positive correlation between fish growth and chlorophyll a was noted in four cases. In... -
The South African Scoring System (SASS) Version 5 Rapid Bioassessment Method for Rivers
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C WS Dickens --- , South Africa PM Graham --- , South AfricaThe assessment of biota in rivers is a widely recognised means of determining the condition or ‘health’ of rivers. Benthic macroinvertebrates, in particular, are recognised as valuable organisms for bioassessments, due largely to their visibility to the naked eye, ease... -
The response of Cyperus papyrus (L.) and Miscanthidium violaceum (K. Schum.) Robyns to eutrophication in natural wetlands of Lake Victoria, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Kipkemboi --- Department of Zoology, Kenya F Kansiime --- , Uganda P Denny --- , The NetherlandsInterrelationships between nutrient concentrations and aerial biomass, root numbers, length and rhizomes size in Cyperus papyrus (L.) (papyrus) and Miscanthidium violaceum (K. Schum.) Robyns (synonymous to Miscanthus violaceus (K. Schum) Pilg.) were established in five different wetlands around the northern... -
Potential impacts of alien freshwater crayfish in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I de Moor --- , South AfricaThe habitat preferences and life history characteristics of four alien species of freshwater crayfish (Cherax tenuimanus, C. destructor, C. quadricarinatus and Procambarus clarkii) are reviewed. The potential impact of these species on South African freshwater ecosystems is assessed and the... -
A preliminary quantitative assessment of gillnet fishing in subtropical Lake Tzaneen, Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NN Nicolaai --- Department of Zoology and Biology, South Africa A Jooste --- Department of Zoology and Biology, South AfricaBetween January 1998 and January 1999 a quantitative investigation was done on the fish populations of Lake Tzaneen, Northern Province, South Africa. Two graded series of multi-filament gillnets were set overnight every six weeks capturing 14 species of fish. Of... -
Changes to the scientific and common names of southern African freshwater fishes
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PH Skelton --- , South AfricaAdditions and changes to the scientific and common names of southern African freshwater fishes made since 1993, are recorded and explained. Nineteen new scientific names are listed including five new species, three genus-name changes, three species-name changes and four new... -
The impact and control of alien aquatic vegetation in South African aquatic ecosystems
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MP Hill --- Weeds Division, South AfricaWater hyacinth, water lettuce, salvinia, parrot's feather and red water fern are South American aquatic plant species that have become invasive in aquatic ecosystems in South Africa. The lack of indigenous natural enemies and the presence of nutrient rich waters... -
Alien and invasive fresh water Gastropoda in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CC Appleton --- , South AfricaTen species of freshwater gastropod have been introduced into South Africa, mostly through the aquarium trade. Two of these, Lymnaea columella (Lymnaeidae) and Physa acuta (Physidae), have been invasive in river systems across the country for many years, probably since... -
Quantitative aspects of oxygen and carbon dioxide exchange through the lungs in Ocypode ceratophthalmus (Crustacea: Decapoda) during rest and exercise in water and air
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WJ van Aardt --- School of Environmental Sciences and Development, South AfricaGhost crabs Ocypode ceratophthalmus were exercised in air and water to measure CO2 and O2 exchange rates using the method of instantaneous measurements of oxygen consumption rate (MO2) where applicable. Average heart rate increased from 100 to nearly 400 pulses... -
Anthropogenic spatial and temporal changes in the aquatic macro invertebrate assemblages of the lower Mvoti River, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Malherbe --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South Africa JHJ van Vuren --- Centre for Aquatic Research, Department of Zoology, South AfricaIndustrial and urban impacts on the lower reaches of the Mvoti River were studied using changes in macroinvertebrate community structures as indicators of environmental change. Macroinvertebrates were sampled during high- and low-flows in 2005 in the lower Mvoti River and... -
Accumulation of hepatic Hsp70 and plasma cortisol in Oreochromis mossambicus following sublethal metal and DDT exposure
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SS Mlambo --- Centre for Aquatic Research, Zoology Department, South Africa JHJ van Vuren --- Centre for Aquatic Research, Zoology Department, South Africa R Basson --- Centre for Aquatic Research, Zoology Department, South Africa B Grant --- Centre for Aquatic Research, Zoology Department, South AfricaHeat shock response in Oreochromis mossambicus livers was measured, using antibodies specific to Hsp70 family members, by an immunoblotting protocol. The hepatic isoforms Hsp70, Hsp74 and Hsp76 were identified and quantified from copper exposures. Long-term DDT exposure did not result... -
Water quality impacts on instream biota of the Shingwedzi River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSO Fouche --- Department of Zoology, South Africa W Vlok --- Department of Zoology, South AfricaWater quality, macroinvertebrate diversity (using SASS5) and fish diversity (using the fish response assessment index) of the Shingwedzi River system were monitored in 2007/2008 to determine the present status of the system. Possible water pollution sources were identified by aerial... -
Biodiversity and extracellular enzymatic activity of heterotrophic bacterial communities in Bardawil Lagoon, Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Bahgat --- Department of Botany, Faculty of Sciences, Egypt A Dewedar --- Department of Botany, Faculty of Sciences, Egypt HM Shafik --- Department of Botany, Faculty of Sciences, Egypt EE Shabana --- Department of Botany, Faculty of Sciences, EgyptThe biodiversity of heterotrophic viable bacteria (209 isolates) in the hypersaline Bardawil Lagoon, Egypt, was studied. Composition and extracellular activities of viable culturable heterotrophic bacteria (VCHB) in the water and in non-colonised and seagrass-colonised sediments of Bardawil Lagoon were determined... -
Characterisation of the mesozooplankton community in response to contrasting estuarine salinity gradients in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TH Wooldridge --- Department of Zoology, South AfricaStructure and pattern of mesozooplankton in three tidal estuaries experiencing contrasting salinity gradients were investigated. In the Kariega Estuary, where freshwater inflow was persistently low with little variation in flow, salinity values exceeded 28–30 for long periods (years) throughout the... -
The effect of physico-chemical parameters on speciation of trace metals insediments from inland and coastal waters of Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CA Biney --- , Burkina Faso R Asmah --- , GhanaThe speciation of cadmium, lead, copper, zinc, manganese and iron into exchangeable, carbonate, reducible and organic bound fractions was studied in sediments from coastal and freshwater environments in Ghana. This was relevant as the species in which metals are stored... -
Factors governing the removal of faecal indicator bacteria in the ecosystem of Lake Timsah, Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Bahgat --- Department of Botany,Persistence of faecal coliforms, presumptive Vibrio cholerae and Vibrio parahaemolyticus at three stations in Lake Timsah were investigated in 2010. Samples were collected by day and at night. Bacterial counts were highest at the outlet of wastewater discharged into the... -
Distribution of Nile perch Lates niloticus in southern Lake Victoria is determined by depth and dissolved oxygen concentrations
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PC Goudswaard --- , the Netherlands EFB Katunzi --- , Tanzania JH Wanink --- , the Netherlands F Witte --- , the NetherlandsAlthough Nile perch Lates niloticus is assumed to be sensitive to low oxygen concentrations, it was found in deep water in Lake Victoria, where oxygen depletion is common during the rainy season. Since factors determining Nile perch distribution are not... -
Impact of drain water on water quality and eutrophication status of Lake Burullus, Egypt, a southern Mediterranean lagoon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EM Ali --- Department of Environmental Sciences, EgyptThe ecological and biological status of Lake Burullus was examined in 2006 to determine its water quality and eutrophication status in response to the quality and quantity of drain water entering it. The lake suffers from excessive nutrient concentrations. Chlorophyll... -
Metal concentrations in water, sediment and sharptooth catfish Clarias gariepinus from three peri-urban rivers in the upper Manyame catchment, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Nhiwatiwa --- Department of Biological Sciences, Zimbabwe M Barson --- Department of Biological Sciences, Zimbabwe AP Harrison --- Department of Animal and Veterinary Basic Sciences, Denmark B Utete --- Department of Biological Sciences, Zimbabwe RG Cooper --- Division of Physiology, UKConcentrations of zinc, cadmium, chromium, nickel, lead, copper and iron were measured in flowing water, riverbed sediments and tissues of sharptooth catfish Clarias gariepinus from three rivers in the upper Manyame catchment over seven months in 2008–2009. The Manyame and... -
Assessment of heavy metal accumulation in Anzali wetland, Iran, using a submerged aquatic plant, Ceratophyllum demersum
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AR Pourkhabbaz --- Department of Environmental Sciences, Faculty of Agriculture, Iran HR Pourkhabbaz --- Department of Environment, Faculty of Natural Resources, Iran T Khazaei --- Department of Environmental Sciences, Faculty of Agriculture, Iran S Behravesh --- Department of Environmental Sciences, Faculty of Agriculture, Iran M Ebrahimpour --- Department of Environmental Sciences, Faculty of Agriculture, IranThe objective of this study in 2009 was to examine whether levels of cadmium (Cd), copper (Cu), zinc (Zn), lead (Pb) and chromium (Cr) were higher in the leaves than in the stems of a submerged aquatic plant Ceratophyllum demersum... -
Heavy metal concentrations in the water of the Nyl River system, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Greenfield --- Department of Zoology, South Africa JHJ van Vuren --- Department of Zoology, South Africa V Wepener --- Department of Zoology, South AfricaThe Nyl River floodplain, a Ramsar site that provides habitat for a number of endangered species, is one of the jewels in the arid Limpopo province and thus its conservation and protection are vitally important. Very little work has been... -
Ecophysiological responses of the salt marsh grass Spartina maritima to salinity
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Naidoo --- School of Biological and Conservation Sciences, South Africa Y Naidoo --- School of Biological and Conservation Sciences, South Africa P Achar --- Department of Biological and Physical Sciences, USAThe effects of salinity on growth and productivity of Spartina maritima (Curtis) Fernald were investigated in glasshouse and field experiments in 2008. In the glasshouse study, plants were subjected to 2%, 10%, 20%, 40% and 80% sea water, with tidal... -
Impact of marine influence and cultivation on the diatom flora of Thiaroye Pond, Dakar, Senegal
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EH Sow --- Department of Geology, Senegal CAK Fofana --- Department of Geology, Senegal C Aw --- Department of Geology, Senegal PM Ndiaye --- Department of Geology, SenegalDuring a limnological and palaeolimnological study of the western part of the Great Coast of Senegal, an analysis of diatoms was carried out in Thiaroye Pond in the suburbs of Dakar. Current diatom flora in the water and on floating... -
Optimum rabbit density over fish ponds to optimise Nile tilapia production in an integrated rabbit–fish system in Rwanda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Rukera Tabaro --- School of Environmental Science, South Africa O Mutanga --- School of Environmental Science, South Africa D Rugege --- School of Environmental Science, South Africa JC Micha --- Research Unit in Environmental Biology, Department of Biology, BelgiumAlthough previous studies have suggested that rabbit excreta can be used as high-quality manure for sustaining plankton production due to their gradual nutrient release, integrated rabbit–fish production systems are still not widely used. Between 2006 and 2010 optimal rabbit densities... -
A preliminary survey of biotic composition of the Olifantspruit catchment, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ZCC Khoza --- Department of Biodiversity, South Africa MJ Potgieter --- Department of Biodiversity, South Africa W Vlok --- Department of Zoology, South AfricaAs a major tributary of the Nyl River, and ultimately for the Nylsvley wetland, the Olifantspruit, Limpopo province, South Africa, was investigated during the summer (high flow) and winter (low flow) of 2007 at three sites. This preliminary study used... -
Sublethal effects of carbaryl on embryonic and gonadal developments of zebrafish Danio rerio
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PK Mensah --- Department of Zoology, South Africa GH Okuthe --- Department of Zoology, South Africa M Onani --- Department of Chemistry, South AfricaCarbaryl is a broad-spectrum insecticide used to control insect pests. In aquatic environments, it can disrupt the endocrine system and adversely affect the reproductive function of aquatic animals. This study investigated sublethal impacts of carbaryl on embryos and gonads of... -
Fungi associated with Eichhornia crassipes in South Africa and their pathogenicity under controlled conditions
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Ray --- Department of Zoology and Entomology, South Africa MP Hill --- Department of Zoology and Entomology, South AfricaEichhornia crassipes Mart. Solms-Laubach (Pontederiaceae), water hyacinth, continues to be the world's worst aquatic weed. In South Africa, considerable research has been conducted on biological control agents associated with water hyacinth, with the release of six arthropods and one fungus,... -
Bioassessment in ephemeral rivers: constraints and challenges in applying macroinvertebrate sampling protocols
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Watson --- Centre for Environmental Management, South Africa HF Dallas --- , South AfricaHydrology is a major factor controlling the structure and function of river ecosystems. In contrast to perennial rivers, temporary rivers have periods where surface flow ceases resulting in a highly variable flow regime. Existing bioassessment methods in South Africa are... -
Composition, abundance, distribution and seasonality of zooplankton in the Sundays Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Sutherland --- Department of Zoology, South Africa TH Wooldridge --- Department of Zoology, South Africa NA Strydom --- Department of Zoology, South AfricaThe zooplankton assemblage in the permanently open Sundays Estuary, on the south-east coast of South Africa, was studied seasonally. Samples were collected once per season between winter 2007 and autumn 2009 by means of boat-based plankton tows. A total of... -
Impacts of trout on aquatic macroinvertebrates in three Drakensberg rivers in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Rivers-Moore --- Centre for Water Resources Research, South Africa B Fowles --- , South Africa RJ Karssing --- , South AfricaGlobal literature suggests that trout, when introduced as alien species into local streams, have had deleterious impacts on aquatic community structure and function. Prior to defining management actions regarding trout in the rivers of the Ukhahlamba-Drakensberg Park (UDP), data are... -
Relationship between water temperature predictability and aquatic macroinvertebrate assemblages in two South African streams
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BR Eady --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa NA Rivers-Moore --- Centre for Water Resources Research, South Africa TR Hill --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South AfricaVariable seasonal stream temperatures are a critical factor in maintaining aquatic invertebrate community patterns. We investigated whether the degree of predictability in a stream's water temperature profile provides insights into the structure and functional predictability of macroinvertebrate communities. Quarterly macroinvertebrate... -
Characterisation of potential aquaculture pond effluents, and physico-chemical and microbial assessment of effluent-receiving waters in central Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: YB Ansah --- Department of Fish and Wildlife Conservation, USA EA Frimpong --- Department of Fish and Wildlife Conservation, USA S Amisah --- Department of Fisheries and Watershed Management, GhanaAn understanding of specific aquaculture systems and the impacts of their management practices leads to sound and cost-effective policies to protect the aquatic environment. Water samples were collected in 2009 from fish ponds, streams that receive effluents directly from ponds... -
Effect of feeding frequency and feeding rate on growth of Oreochromis mossambicus (Teleostei: Cichlidae) fry
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RW Luthada --- Department of Zoology, South Africa HL Jerling --- Department of Zoology, South AfricaThe effect of feeding frequency and feeding rate on growth of Oreochromis mossambicus fry was investigated over 30 d under temperature- and light-cycle-controlled conditions on the University of Zululand campus, South Africa, in October and November 2009. Weight gain, specific... -
Antibiotic resistance among heterotrophic bacteria in Lagos Lagoon, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OA Agwu --- Department of Biological Oceanography, NigeriaAntibiotic-resistant bacteria in the aquatic environment are considered reservoirs for drug-resistant genes. Therefore, culturable heterotrophic bacteria isolated from Lagos Lagoon surface waters between 2011 and 2012 were screened for their susceptibility to 14 commonly used antibiotics belonging to six major... -
Effects of water quality changes on phytoplankton and lesser flamingo Phoeniconaias minor populations at Kamfers Dam, a saline wetland near Kimberley, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LM Hill --- School of Agricultural, Forest and Environmental Sciences, USA WW Bowerman --- University of Maryland, USA JC Roos --- Water Quality Consultants, South Africa WC Bridges --- Department of Mathematical Sciences, USA MD Anderson --- BirdLife South Africa, South AfricaKamfers Dam, a wetland near Kimberley, South Africa, supports a population of Near Threatened lesser flamingos Phoeniconaias minor. The cyanobacterium Arthrospira fusiformis (Voronikhin) Komarek and Lund 1990, the flamingos’ food source, was in bloom in April 2009. The city's wastewater... -
Trends in waterbird diversity at Banzi, Shokwe and Nyamithi pans, Ndumo Game Reserve, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Madel Whittington --- Department of Nature Conservation, South Africa Gerard Malan --- Department of Nature Conservation, South Africa MichaelD Panagos --- Department of Nature Conservation, South AfricaOur understanding of the timeous changes to pan-associated bird diversity is very important for the conservation of these wetlands. At Ndumo Game Reserve, a Ramsar site located in northern KwaZulu-Natal, seasonal (from March 2005 to January 2006 at Nyamithi Pan)... -
Distribution, breeding phenology and time budget of Ruddy Shelduck Tadorna ferruginea during the annual cycle in the Hauts Plateaux, north-east Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Mouloud Boulkhssaïm --- Department of Biology, Algeria Abdallah Ouldjaoui --- Department of Biology, Algeria AhmedH Alfarhan --- Center of Excellence for Research in Biodiversity, Saudi Arabia Boudjéma Samraoui --- Center of Excellence for Research in Biodiversity, Saudi ArabiaBetween September 2003 and July 2006, the reproductive biology and time budget of the Ruddy Shelduck Tadorna ferruginea was studied in the wetland complex of Oum el Bouaghi, north-east Algeria. Our results indicate a marked post-breeding dispersal of the Ruddy... -
Status and breeding ecology of the Common Moorhen Gallinula chloropus in Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Farrah Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, Algeria AhmedH Alfarhan --- Center of Excellence for Research in Biodiversity, Saudi Arabia Boudjéma Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, AlgeriaThe status of the Common Moorhen Gallinula chloropus in Algeria and its breeding ecology in North Africa are reported for the first time. Nest site selection and breeding parameters were studied at two contrasting sites in north-east Algeria: Boussedra, an... -
Habitat use pattern of three species of egrets in a small coastal lagoon in Ghana
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Francis Gbogbo --- Department of Animal Biology and Conservation Science, Ghana Gideon Kwarteng Acheampong --- Department of Animal Biology and Conservation Science, Ghana John-Mark Yaw Atiemo --- Department of Animal Biology and Conservation Science, Ghana Quist Elorm Crepindale --- Department of Animal Biology and Conservation Science, GhanaThe foraging and pattern of habitat use of Western Reef Heron Egretta gularis, Little Egret Egretta garzetta and Great Egret Egretta alba were studied in Sakumo II Lagoon in Ghana to determine the extent of utilisation of non-fish resources by... -
MICROCRYSTALLINE CELLULOSE POWDERS, PROPERTIES AND POSSIBLE APPLICATIONS IN NUTRITION
Item type: Journal Article • Journal: South African Forestry Journal • Authors: H. Steege B. Phillipp R.E. Nest G. Magister H.J. Lewerenz D. Bleyl Reeves -
Could phosphorus concentrations increase with the development of cage culture in Lake Kariba, Zimbabwe?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- Department of Biological Sciences, Zimbabwe W Mhlanga --- Department of Environmental Science, Zimbabwe P Mwera --- Lake Harvest, Zimbabwe P Tendaupenyu --- Department of Biological Sciences, ZimbabweA comparison between historical and current data was done to determine whether the concentrations of total phosphorus, orthophosphate and chlorophyll a, and Secchi disc transparency, have changed in the Sanyati Basin of Lake Kariba following the commencement of cage culture... -
Chironomid distribution along a pollution gradient in Ethiopian rivers, and their potential for biological water quality monitoring
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Beneberu --- Department of Biology, Ethiopia S Mengistou --- Zoological Sciences Programme Unit, Ethiopia H Eggermont --- Belgian Biodiversity Platform, Belgium D Verschuren --- Limnology Unit, Department of Biology, BelgiumWater pollution resulting from the rapidly intensifying use of freshwater resources in Ethiopia is increasing the need for continuous follow-up and monitoring of the country's aquatic ecosystems, in order to maintain their biological diversity and water quality. Chironomids (non-biting dipteran... -
ZOOPLANKTON AND ESTUARINE RELICT (BENTHIC) FAUNA IN LAKE MZINGAZI, A FRESHWATER COASTAL LAKE OF NATAL
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: B.K. Fowles --- , South Africa C. G.M. Archibald --- , South AfricaLake Mzingazi, a natural, undisturbed freshwater coastal lake in the heart of the Richards Bay municipal area, is threatened by rapid urban and industrial growth. The previously unrecorded composition and distribution of zooplankton in the lake was studied during 1979... -
THE USE OF MICROCOMPUTERS IN WATER RESOURCE MODELLING
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: W. J.R. Alexander --- Department of Civil Engineering,Microcomputers are the ideal tool for water resource modelling. Not only are they fast and computationally efficient, but they can also provide the user with dynamic graphical displays which greatly assist in the interpretation of the results of the analyses... -
WATER QUALITY MODELLING PERCEPTIONS OF A WATER RESOURCE MANAGEMENT ORGANIZATION
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: H.D. Furness --- Scientific Services Division, South Africa W.N. Richards --- Scientific Services Division, South AfricaThe use of models by the South African water industry is discussed. It is suggested that climatic conditions and existing legislation have influenced the formulation of models. Future model requirements by the water Industry are outlined. Changes are suggested which... -
FUTURE CHALLENGES IN WATER QUALITY MODELLING WITH PARTICULAR REFERENCE TO OPERATIONALLY CLOSED CATCHMENTS
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: S.F. Forster --- Department of Water Affairs, South Africa F.A. Stoffberg --- Department of Water Affairs, South Africa J.A. van Rooyen --- Department of Water Affairs, South AfricaAs a result of the declining quality of many water sources, the use of water quality models in planning is increasing. To date applications have involved the simulation of total dissolved salts and nutrients, largely in catchments affected by urban... -
Water-body preferences of dominant calanoid copepod species in the Angola-Benguela frontal zone
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Loick W Ekau HM VerheyeThe distribution of five dominant calanoid copepods was related to different water masses in the Angola-Benguela Front system. Five water bodies were identified by principal component analysis, on the basis of abiotic parameter such as temperature, salinity, dissolved oxygen, phosphate,... -
A demonstration of the hydrographic partition of the Benguela upwelling ecosystem at 26°40'S
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CM Duncombe RaeContinuous CTD data from a series of recent cruises show that the distribution of the water mass characteristics in the central Benguela region from the Orange River mouth (28°38'S) to alvis Bay (22°57'S) is discontinuous in the central and intermediate... -
Historical cyst record as evidence for the recent introduction of the dinoflagellate Gymnodinium catenatum in the north-eastern Atlantic
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Amorim B DaleThe geographical origin of the warm-temperate paralytic shellfish poison producer Gymnodinium catenatum Graham is still under debate. It was first reported in the north-eastern Atlantic in 1976, from the Galician rías (North-West Iberia). Since then, and until 1995, recurrent blooms... -
Algal blooms in Nigerian waters: an overview
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GA Akin-Oriola MA Anetekhai A OriolaAwareness of harmful algal blooms (HABs) and their associated impacts is poor or lacking in the West African sub-region. Different aquatic environments in Nigeria have reportedly experienced blooms of algae either seasonally or year round, but there are no documented... -
Cysts of potentially harmful dinoflagellates, with emphasis on the genus Alexandrium, in Sepetiba Bay (Brazil) during a port survey of GloBallast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: VB Juliano VMT GarciaSepetiba Bay in south-eastern Brazil has been selected as a pilot demonstration site within the Global Ballast Water Management Programme (GloBallast; IMO/PNUD/GEF). As part of the port baseline survey, a series of 43 sediment cores was taken in triplicate in... -
Cyanobacteria species identified in the Weija and Kpong reservoirs, Ghana, and their implications for drinking water quality with respect to microcystin
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Addico J Hardege J Komarek P Babica KAA de Graft-JohnsonThe Kpong and Weija reservoirs supply drinking water to Accra, Ghana. This study was conducted to identify the cyanobacteria present in these reservoirs and to ascertain whether current treatment processes remove whole cyanobacteria cells from the drinking water produced. Cyanotoxins... -
Towards the declaration of a large marine protected area: a subtidal ichthyofaunal survey of the Pondoland coast in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann L Celliers ST Fennessy S Bailey AD WoodA subtidal marine ichthyofaunal survey was carried out on shallow reefs (1–30m deep) in the Pondoland region between the Mtamvuna River and Port St Johns in the Eastern Cape, South Africa. The purpose of this survey was to provide the... -
Shelf currents, lee-trapped and transient eddies on the inshore boundary of the Agulhas Current, South Africa: their relevance to the KwaZulu-Natal sardine run
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Roberts --- Oceans and Coasts, Department of Environmental Affairs, South Africa CD van der Lingen --- Branch Fisheries, Department of Agriculture, South Africa C Whittle --- Department of Oceanography, South Africa M van den Berg --- Oceans and Coasts, Department of Environmental Affairs, South AfricaThe existence and strength of the annual KwaZulu-Natal (KZN) sardine run has long been a conundrum to fishers and scientists alike ― particularly that the sardine Sardinops sagax migrate along the narrow Transkei shelf against the powerful, warm Agulhas Current... -
Characteristics and value of the Thukela Banks crustacean and linefish fisheries, and the potential impacts of changes in river flow
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JK Turpie --- Anchor Environmental Consultants, South Africa SJ Lamberth --- Branch Fisheries, Department of Agriculture, Forestry and Fisheries, South AfricaThis study describes the Thukela Banks crustacean and linefish fisheries and investigates the potential impacts of reduced flow from the Thukela River on the value of these fisheries. Data were obtained from published and unpublished material, key informants and government... -
Integrated culture of silver kob Argyrosomus inodorus and bloodworm Arenicola loveni loveni in abalone farm effluent
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RD Yearsley --- Department of Ichthyology and Fisheries Science, South Africa CLW Jones --- Department of Ichthyology and Fisheries Science, South Africa PJ Britz --- Department of Ichthyology and Fisheries Science, South Africa NG Vine --- Department of Ichthyology and Fisheries Science, South AfricaSouth African abalone Haliotis midae farms utilise large volumes of seawater (c. 500–1 500 l s–1) and produce relatively dilute effluents that are potentially suitable for the integrated culture of other species. To test this hypothesis, a marine finfish, silver... -
Prey capture success and chick diet of Damara terns Sterna balaenarum in Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Braby --- Animal Demography Unit, Department of Zoology, South Africa LG Underhill --- Animal Demography Unit, Department of Zoology, South Africa RE Simmons --- Percy FitzPatrick Institute of African Ornithology, Department of Zoology, South AfricaFeeding terns are affected by a variety of environmental conditions. We studied prey capture success of Damara terns Sterna balaenarum in relation to six variables at two breeding colonies in southern Namibia: tidal phase, wind speed, water clarity, cloud cover,... -
Phytoplankton production and adaptation in the vicinity of Pemba and Zanzibar islands, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Barlow --- , South Africa T Lamont --- , South Africa M Kyewalyanga --- , Tanzania H Sessions --- Oceans and Coasts, Department of Environmental Affairs, South Africa M van den Berg --- Oceans and Coasts, Department of Environmental Affairs, South Africa F Duncan --- , South AfricaPhytoplankton production and physiology were investigated at six selected locations during a research cruise in early October 2007 in Tanzanian coastal waters. The dataset included photosynthesis– irradiance and active fluorescence parameters, phytoplankton absorption coefficients, and pigment concentrations. Primary production was... -
Evaluation of an underwater biopsy probe for collecting tissue samples from bull sharks Carcharhinus leucas
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Daly --- Department of Zoology and Entomology, South Africa MJ Smale --- , South AfricaThis study evaluated the use of a novel underwater biopsy probe designed to collect muscle and dermal tissue samples from large (170–220 cm total length), free-swimming bull sharks Carcharhinus leucas. The biopsy probe tissue retention rate was 87% after 23... -
Abyssal scavenging demersal fauna at two areas of contrasting productivity on the Subantarctic Crozet Plateau, southern Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NJ Cousins --- Oceanlab, UK T Horton --- National Oceanography Centre, Southampton, UK BD Wigham --- Dove Marine Laboratory, School of Marine Science and Technology, UK PM Bagley --- Oceanlab, UKThe Crozet Plateau is situated below typical high-nutrient, low-chlorophyll (HNLC) waters of the southern Indian Ocean. The area to the east of the Crozet Islands experiences high levels of surface productivity during the austral summer due to natural iron enrichment... -
Occurrence of larval fishes in a rocky shore-associated nursery area in temperate South Africa, with emphasis on temperature-related growth in dominant Sparidae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NA Strydom --- Nelson Mandela Metropolitan University, South Africa AJ Booth --- Department of Ichthyology and Fisheries Science, South Africa A McLachlan --- Nelson Mandela Metropolitan University, South AfricaLarval fishes were studied in Shark Bay on the warm, temperate south-east coast of South Africa. The bay is a small, shallow, subtidal area associated with a rocky shore. Sampling took place fortnightly for a period of one year (September... -
Protecting wood with a water repellent/ paint combination
Item type: Journal Article • Journal: South African Forestry Journal • Authors: J.D. van Zyl --- , W.J. van Wyk --- ,The influence of high and/or low solids water repellent on the durability of an alkyd enamel paint on P. radiata was investigated. Apart from increasing the drying time of the first paint coat, a low solids water repellent proved a... -
Modelling growth and water use in four Pinus patula stands with the 3-PG model
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors:Accurate prediction ofgrowth andyield offorest plantations remains importantto the forestry industry for such purposes as assessing the benefits ofsilvicultural practices, matching species to site, understanding economic risks, predicting profitability and scheduling harvests. Conventional methodology is based on statistically-derived stand growth... -
Water use efficiency: What are the implications for plantation forestry?
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: N.W. Pammenter --- , South AfricaWater use efficiency (WUE) is the ratio of some measure of growth or carbon assimilation to water utilization. It can be considered at the level ofthe leaf, whole plant or stand, and can be expressed in terms of total plant... -
Effect of rainfall and under-canopy vegetation on the ability to debark Eucalyptus grandis x E. camaldulensis when felled in Zululand, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Gert J. van den Berg --- , Republic of South Africa Keith M. Little --- , Republic of South AfricaThe combined effects of seasonal variation in rainfall and the presence or absence of under-canopy vegetation on soil moisture content may have a negative or positive impact on the ability to debark eucalypts. A study was initiated to investigate these... -
Some notes on the effect of wet-storage on timber
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: F.S. Malan --- Komatiland Forests Pty Ltd, AfricaThe storage of logs under water sprays has proved to be a highly effective method to preserve logs over prolonged periods against drying defects and infestation by staining fungi. Wet-storage has little effect on wood quality apart from some degradation... -
Variation in foliar water content and hyperspectral reflectance of Pinus patula trees infested by Sirex noctilio
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: O Mutanga --- School of Environmental Sciences, South Africa R Ismail --- School of Environmental Sciences, South AfricaThe remote detection and quantification of symptoms associated with declining forest health is critical for the introduction of proper pest monitoring and control measures. Sirex noctilio, the Eurasian wood wasp, is one of the major pests responsible for declining forest... -
Critical water stress levels in Pinus patula seedlings and their relation to measures of seedling morphology
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: CA Rolando --- , New Zealand NW Pammenter --- , South Africa KM Little --- , South AfricaA pot trial was implemented to determine the effect of soil water stress following transplanting on shoot water potential and stomatal conductance of Pinus patula seedlings. The relationship of seedling morphology to measures of water stress was also investigated. The... -
Site quality assessment of a Pinus radiata plantation in Victoria, Australia, using LiDAR technology
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Y Chen --- School of Geography and Environmental Science, Australia X Zhu --- School of Geography and Environmental Science, AustraliaThe aim of site quality assessment of Pinus radiata plantations is to determine the quality and productivity of the growing stock at different sites. It provides a useful indication of the site productivity to assist in the allocation of optimum... -
Growth response at age 10 years of five Eucalyptus genotypes planted at three densities on a drought-prone site in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jacob Crous --- Sappi Forests, South Africa Louisa Burger --- Department of Forest and Wood Science, South Africa Giovanni Sale --- Sappi Forests, South AfricaSouth Africa's climate is characterised by the occurrence of regular droughts. An assessment of drought mortality in KwaZulu-Natal during 1999 could not provide accurate information regarding the effect of species or planting density on mortality because of confounding species-site allocations... -
Water relations of Eucalyptus nitens × Eucalyptus grandis: is there interclonal variation in response to experimentally imposed water stress?
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: ME Oscar Mokotedi --- CSIR Natural Resources and the Environment, South AfricaThis study tested the hypothesis that water stress increases the hydraulic efficiency of Eucalyptus nitens × E. grandis saplings as a result of osmotic and elastic adjustments. Eucalyptus nitens × E. grandis clones (NH00, NH58, NH69 and NH70) were potted... -
A preliminary survey and analysis of the spatial distribution of aquatic invertebrates in the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HelenF Dallas Belda MosepeleThe spatial distribution of aquatic macroinvertebrates in the Okavango River Delta, Botswana, was investigated during the low-water period in February 2003. This complements an earlier study undertaken during high-water in June 2000. Seventy-five samples were taken in a range of... -
Trace metal contamination of water at a solid waste disposal site at Kariba, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PortiaC ChifambaTrace metal concentrations were determined in soil samples collected from within, and close to, a solid waste disposal site at Kariba, Zimbabwe, and in water flowing from the area during 1996 and 1997. Soil samples were collected from the surface... -
Human impact on lake ecosystems: the case of Lake Naivasha, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GeorgeE Otiang'a-Owiti Ignatius Abiya OsweLake Naivasha is a wetland of national and international importance. However, it is under constant anthropogenic pressures, which include the quest for socioeconomic development within the lake ecosystem itself as well as other activities within the catchment. The lake is... -
Water quality in South African temporarily open/closed estuaries: a conceptual model
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GavinC Snow Susan TaljaardOf the five types of estuaries found in South Africa, temporarily open/closed estuaries comprise approximately 70% of the total. This paper provides an overview and a simple conceptual model of the water quality features and characteristics of temporarily open/closed estuaries... -
Groundwater seeps as potentially important refugia for freshwater fishes on the Eastern Shores of Lake St Lucia, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SvenM Vrdoljak RobC HartThe freshwater wetlands on the Eastern Shores of Lake St Lucia provide an important habitat for freshwater fishes, including a number of IUCN Red Listed species. The ecology of these wetlands is influenced greatly by water flowing from the large... -
Water quality and plankton dynamics in two small dams in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Tamuka Nhiwatiwa BrianE MarshallTwo small dams on the Munwahuku River was investigated in relation to the influence of hydrology on their water chemistry over the period January 2000–August 2001. The water level of the upper dam fluctuated more than that of the lower... -
Response of resident bacteria in a tropical detergent effluent-polluted stream to linear alkylbenzene sulfonate (LAS)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Kit EniolaBacteria were isolated from a tropical detergent-polluted stream, and their responses to linear alkylbenzene sulfonate (LAS) were investigated. The responses of the resident bacteria were assessed in terms of their ability or failure to grow in the presence of LAS... -
The community composition and biomass of pelagic ciliated protozoa in East African lakes
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AndrewW Yasindi WilliamD Taylor DenisH LynnThe community composition and biomass of planktonic ciliates were studied in 17 tropical East African lakes varying from freshwater to saline, and from oligotrophic to eutrophic. The conductivity of the lakes varied from 207μS cm−1 to 70 000μS cm−1. Chlorophyll... -
Environmental impact of seasonal integrated aquaculture ponds ('fingerponds') in the wetlands of Lake Victoria, Kenya: an assessment, with the aid of Bayesian Networks
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Julius Kipkemboi AnneA van Dam Patrick DennyThe potential effect on ecosystem integrity of the use of natural wetlands for seasonal wetland fishponds ('fingerponds'), integrated with vegetable production for livelihood demands, was evaluated using experimental sites at Lake Victoria, Kenya. Soluble reactive phosphorous and total phosphorus, ammonium,... -
Heavy metals in the water and sediments of Oued Es-Souk, Algeria, a river receiving acid effluents from an abandoned mine
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Chahrazed BoukhalfaThe Sidi Kamber Mine, abandoned since 1976, is still a source of acidic drainage entering the Oued Es-Souk River. An investigation of the rate of pollution of the Oued Es-Souk and the variation of its water quality showed that the... -
Changes in algal composition and environmental variables in the high-altitude Mohale Dam — an important water supply reservoir to South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Sanet Janse van Vuuren Nicolene van der Walt Annelie SwanepoelWhereas limited knowledge exists on the ecology and algae present in Lesotho's high-altitude Katse Dam, nothing is published about these aspects in the linked Mohale Dam, completed in 2003. This study investigated the changes in algal composition and associated environmental... -
Trends analysis relating to pollution in Sakumo Lagoon, Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ruby Asmah Hedrick Dankwa CA Biney CC AmankwahSakumo Lagoon, situated near Accra, is a Ramsar-listed coastal wetland threatened by urban and agricultural waste, being located in an urban area where access to domestic and waste disposal facilities is a major problem. The aim of this study was... -
A chronic toxicity test protocol using Caridina nilotica (Decapoda: Atyidae) and the generation of salinity toxicity data
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AR Slaughter CG Palmer WJ MullerSalinization of freshwater resources is an increasing global problem, yet there is a paucity of chronic salinity tolerance data linked to very few chronic toxicity test protocols. This research aimed to generate a chronic toxicity test protocol and protective salinity... -
Variation in benthic macroinvertebrate assemblages in Ologe Lagoon, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TundeOT ImoobeThe community structure, diversity and seasonal variation of the benthic macroinvertebrates in Ologe Lagoon were studied at four sites during the dry and wet seasons of 2003 to provide environmental baseline data for the lagoon. The community comprised 29 taxa... -
Lake Victoria water resources management challenges and prospects: a need for equitable and sustainable institutional and regulatory frameworks
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GB LuiloCurrent issues relating to water utilisation, pollution and management in Lake Victoria, as well as legislative and regulatory history governing the management of the Lake Victoria Basin are reviewed. The articles of the agreements, many of which are now outdated,... -
Macroinvertebrate colonisation of artificial substrates in a Nigerian river I: gravel and leaf litter
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JO Olomukoro U OkologumeBenthic macroinvertebrate colonisation of artificial gravel and leaf litter substrates over periods of four to 40 days was examined in the Ogba River, Benin City, Nigeria. Of all the assemblages of organisms identified (398 individuals, 27 taxa) on different substrates,... -
Anaemia in the freshwater catfish Clarias albopunctatus (Teleostei: Clariidae) exposed to brewery wastewater effluent
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NS OluahHaematological changes were studied in freshwater catfish Clarias albopunctatus exposed for 20 days to 25%, 50% and 100% concentrations of brewery wastewater prepared by dilution using tap water. Haemoglobin, haematocrit and erythrocyte counts in fish exposed to wastewater were significantly... -
Fish community response to increased river flow in the Kariega Estuary, a freshwater-deprived, permanently open southern African system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PD Vorwerk PW Froneman AW Paterson AK WhitfieldThe littoral and demersal ichthyofaunal community structure in the freshwater-deprived, permanently open Kariega Estuary was investigated following heavy rain in November 2006 and was compared to low-flow condition data from 1991 and 1996. All surveys took place during the spring... -
Preliminary assessment of oestrogenic activity in water sources in Rietvlei Nature Reserve, Gauteng, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NH Aneck-Hahn MS Bornman C de JagerA preliminary assessment was made of oestrogenic activity in water sources in the Rietvlei Nature Reserve, from which water is supplied to the metropolitan area of Pretoria. Single samples were extracted from seven sites using a solid phase C18 cartridge... -
A preliminary benthic macroinvertebrate index of biotic integrity (B-IBI) for monitoring the Moiben River, Lake Victoria Basin, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FO Masese PO Raburu M MuchiriA Benthic Index of Biotic Integrity (B-IBI) was developed for the Moiben River. The index assesses effects of human disturbance on the biotic condition of stream macroinvertebrate communities. Eight stations were selected to represent different land-use types including forestry, settlement,... -
Haematological characteristics of African bony tongue, Heterotis niloticus (Teleostei: Arapaimidae), in south-western Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ayotunde OA Fagbenro BO OffemHaematological characteristics — including red and white blood cells counts, haemoglobin, haematocrit, mean cell haemoglobin concentration, mean cell volume, mean cell haemoglobin, protein, glucose, albumin, sodium, chloride, potassium, magnesium and phosphorus — were established from an examination of 25 adult... -
Macroinvertebrate assemblages as biological indicators of water quality in the Moiben River, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FO Masese M Muchiri PO RaburuBenthic macroinvertebrate assemblages at eight stations in the Moiben River, corresponding to different catchment land uses, were assessed in 2006 as indicators of water quality. The relative abundance per taxon, diversity index, richness index, evenness, dominance, percentage of five dominant... -
Conserving the fishes of the Twee River, Western Cape, South Africa: revisiting the issues
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr LME Sutcliffe JA Day CL Griffiths PH SkeltonThe Twee River catchment contains two endemic fish species — the Twee River redfin and the Twee River galaxias — which are threatened by water abstraction, habitat degradation, and the presence of introduced fishes. Fyke nets were used to determine... -
Community participation in river monitoring using diatoms: a case study from the Buffelspoort Valley Conservancy
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Taylor --- School of Environmental Sciences and Development (Botany Division), South Africa N Pope --- , South Africa L van Rensburg --- School of Environmental Sciences and Development (Botany Division), South AfricaThis study was undertaken to determine the present ecological state of rivers and streams in the Buffelspoort Valley Conservancy (BVC), against which later potential changes in, and impacts on, water quality could be measured. After very brief training, all field... -
Age estimation, growth rate and size at sexual maturity of tigerfish Hydrocynus vittatus from the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Gerber --- Centre for Aquatic Research, Department of Zoology, South Africa NJ Smit --- Centre for Aquatic Research, Department of Zoology, South Africa GM Pieterse --- Centre for Aquatic Research, Department of Zoology, South Africa D Durholtz --- , South AfricaThe aims of this study were to determine relative age, growth rate and size at maturity of tigerfish in the Okavango Delta as a basis for the development of a fisheries management plan. A total of 206 tigerfish Hydrocynus vittatus,... -
Comparison of, and the effects of altered freshwater inflow on, fish assemblages of two contrasting South African estuaries: the cool-temperate Olifants and the warm-temperate Breede
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SJ Lamberth L van Niekerk K HutchingsThis study compares the fish assemblages of the permanently open cool-temperate Olifants and warm-temperate Breede estuaries on the west and south coasts of South Africa respectively, and their responses to altered freshwater flows. Both estuaries have experienced a >35% reduction... -
Catching and tracking the world's largest Zambezi (bull) shark Carcharhinus leucas in the Breede Estuary, South Africa: the first 43 hours
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ME McCord SJ LamberthThe Zambezi or bull shark Carcharhinus leucas is a large, predatory shark that occurs in warm-temperate, tropical and subtropical coastal and estuarine systems worldwide. To confirm reports of Zambezi sharks in the Breede Estuary on the south-west coast of South... -
Assessing the effects of early silvicultural management on long-term site productivity of fast-growing eucalypt plantations: the Brazilian experience
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JLM Gonçalves JL Stape J-P Laclau J-P Bouillet J RangerEucalyptus is the dominant and most productive planted forest in Brazil, covering around 3.4 million ha for the production of charcoal, pulp, sawtimber, timber plates, wood foils, plywood and for building purposes. At the early establishment of the forest plantations,... -
Steroid hormone concentrations and physiological toxicity of water from selected dams in Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AK Faul --- Department of Biological Sciences, Namibia E Julies --- Department of Biological Sciences, Namibia EJ Pool --- Department of Medical Biosciences, South AfricaNamibia is a semi-arid to arid country and has most of its surface water in dams built on ephemeral rivers. Whilst water quality is often measured in terms of bacterial contamination and general physico-chemical characteristics, this study extends water quality... -
Salinity tolerance of the South African endemic amphipod Grandidierella lignorum (Amphipoda: Aoridae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NF Masikane --- School of Life Sciences, South Africa BK Newman --- Coastal Systems Research Group, Natural Resources and the Environment, South Africa UM Scharler --- School of Life Sciences, South AfricaThe endemic amphipod Grandidierella lignorum is an organism potentially suited to the toxicity testing of coastal water and sediment in South Africa. The ranges of salinity and temperature at which G. lignorum can be used for toxicity testing were investigated... -
Influence of selected abiotic factors on aquatic macroinvertebrate assemblages in the Olifants River catchment, Mpumalanga, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Kemp --- Unit for Environmental Sciences and Management, South Africa KN de Kock --- Unit for Environmental Sciences and Management, South Africa V Wepener --- Unit for Environmental Sciences and Management, South Africa W Roets --- Unit for Environmental Sciences and Management, South Africa L Quinn --- Unit for Environmental Sciences and Management, South Africa CT Wolmarans --- Unit for Environmental Sciences and Management, South AfricaBiodiversity is frequently seen as an indicator of ecological health. Therefore a survey of the macroinvertebrates of the Olifants River, one of the most polluted rivers in South Africa, was conducted in 2010–2011. Four surveys were conducted at a total... -
A comparison of productive and non-productive green water-use efficiency of Podocarpus henkelii and Pinus patula in the KwaZulu-Natal Midlands
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Hartley H Bulcock --- Centre for Water Resources Research, South Africa Mark B Gush --- CSIR, South Africa Graham PW Jewitt --- Centre for Water Resources Research, South AfricaA number of studies undertaken in South Africa to quantify the green water-use (total evaporation) of introduced commercial forestry species have shown conclusively that green water-use from commercial forest plantations is substantially higher than from the original grasslands or fynbos... -
Performance of simple irrigation scheduling calendars based on average weather data for annual ryegrass
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Melake K Fessehazion --- Plant Production and Soil Science, South Africa John G Annandale --- Plant Production and Soil Science, South Africa Colin S Everson --- Plant Production and Soil Science, South Africa Richard J Stirzaker --- Plant Production and Soil Science, South Africa Michael van der Laan --- Plant Production and Soil Science, South Africa Wayne F Truter --- Plant Production and Soil Science, South Africa Amanuel B Abraha --- Plant Production and Soil Science, South AfricaPoor irrigation management in pastures can lead to yield and quality reduction as well as loss of income through extra pumping and leaching of nitrate fertiliser. A number of irrigation scheduling techniques of varying levels of sophistication have been developed... -
Acute toxicity of selected heavy metals to Oreochromis mossambicus fry and fingerlings
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TB Mashifane --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South Africa NAG Moyo --- Aquaculture Research Unit, School of Agricultural and Environmental Sciences, South AfricaAcute toxicity of copper, lead and iron to tilapia Oreochromis mossambicus fry and fingerlings was tested using 24 h to 96 h static non-renewal toxicity tests. Three methods, probit analysis, Spearman–Karber and a linear regression model, were used to calculate... -
Status and diurnal activity budget of non-breeding White-headed Ducks Oxyura leucocephala in Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Nedjwa Meziane --- Laboratoire de Recherche et de Conservation des Zones Humides, Algeria Farrah Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, Algeria Boudjéma Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, AlgeriaIn Algeria, the Globally Endangered White-headed Duck Oxyura leucocephala is resident throughout the year in the coastal wetlands of north-east Algeria and the Hauts Plateaux, where it occupies habitats that range from freshwater ponds and brackish marshes to hypersaline lakes... -
Interactions between stream channel incision, soil water levels and soil morphology in a wetland in the Hogsback area, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mohammed Y Omar --- Department of Agronomy, South Africa Pieter AL Le Roux --- Department of Soil, Crop and Climate Sciences, South Africa Johan J van Tol --- Department of Agronomy, South AfricaWetland degradation in the form of channel incisioning can significantly alter the hydrological functioning of a wetland. In this study in a small headwater wetland in the Hogsback area, Eastern Cape province, the impact of channel incisioning on soil water... -
Do SASS5 scores vary with season in the South African highveld? A case study on the Skeerpoort River, North West province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HE Fourie --- Department of Zoology and Entomology, South Africa C Thirion --- Department of Water Affairs: Resource Quality Services, South Africa CW Weldon --- Department of Zoology and Entomology, South AfricaMacroinvertebrate assemblages can vary with season as a result of changing environmental conditions and phenology of individual species. The objective of this study was to determine whether results from the South African Scoring System version 5 (SASS5) are affected by... -
Analysis of active rotenone concentration during treatment of the Rondegat River, Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: E Slabbert --- Department of Microbiology, South Africa MS Jordaan --- CapeNature Scientific Services, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaMost endemic freshwater fish species of the Cape Floristic Region are listed as threatened, due mainly to the impacts of invasive alien fish species. The piscicide rotenone has been identified as a potential tool to aid the conservation of indigenous... -
Effects of irrigation water quality on vegetables Part 1: Yield and aesthetical appeal
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Loyiso L Mzini --- Döhne Agricultural Development Institute, South Africa Kevin Winter --- Department of Environmental and Geographical Sciences, South AfricaResearch on the use of greywater for irrigation has focused attention largely on greywater quality and biomass of the crop, but not on the quality of edible vegetable crops, whereas aesthetical appeal of the vegetables determines the acceptance in fresh... -
Soil properties and elements other than hydrogen that can affect the field calibration of a neutron water meter
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Reedah M Mampana --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Danie J Beukes --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Corrie M Swanepoel --- Agricultural Research Council–Institute for Soil, Climate and Water, South AfricaA neutron water meter (NWM) operates on the principle that emitted high-energy neutrons are thermalised by elastic collisions with atomic nuclei present in soil, such as that of the hydrogen atom. Thermalised neutrons, however, are affected by other nuclear-matter interactions... -
Effects of irrigation water quality on vegetables Part 2: Chemical and nutritional content
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Loyiso L Mzini --- Döhne Agricultural Development Institute, South Africa Kevin Winter --- Department of Environmental and Geographical Sciences, South AfricaThe internal qualities of edible vegetable crops have not been widely researched in South Africa. The aim of this study was to determine possible accumulation of nutrients and heavy metals within these crops after being irrigated with greywater (generated from... -
Greenhouse evaluation of deficit irrigation on the growth of tomato and eggplant and their interactions with Meloidogyne javanica
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Osama Mohawesh --- Department of Plant Production and Integrated Pest Management, Faculty of Agriculture, Jordan Muwaffaq Karajeh --- Department of Plant Production and Integrated Pest Management, Faculty of Agriculture, JordanDeficit irrigation is considered to be an important approach for crop cultivation in dry regions where water resources are scarce. Deficit irrigation can be used also to decrease the level of infections by some moisturedependent plant pests and diseases such... -
Consumption of sachet water in Nigeria: quality, public health and economic perspectives
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: David O. Omole --- Department of Civil Engineering, South Africa Julius M. Ndambuki --- Department of Civil Engineering, South Africa Kehinde Balogun --- Department of Civil Engineering, NigeriaDemand for drinking water is met by different methods in different parts of the world. Water packaging into polyethylene sachets (as a form of water vending) has assumed an innovative status which has spread from its origin in Nigeria to... -
Rapid bioassessment of the effects of repeated rotenone treatments on invertebrate assemblages in the Rondegat River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TA Bellingan --- Department of Zoology and Entomology, South Africa DJ Woodford --- Centre for Invasion Biology, South Africa J Gouws --- Scientific Services, CapeNature, South Africa MH Villet --- Department of Zoology and Entomology, South Africa OLF Weyl --- Centre for Invasion Biology, South AfricaThe potential collateral effects of eradicating invasive fishes in streams necessitate the monitoring of invertebrate communities during treatment. In an environmental rehabilitation programme, non-native smallmouth bass were removed from the lower reaches of the Rondegat River, Western Cape, South Africa,... -
Water quality monitoring in sub-Saharan African lakes: a review of remote sensing applications
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Dube --- School of Agricultural, Earth and Environmental Sciences, South Africa O Mutanga --- School of Agricultural, Earth and Environmental Sciences, South Africa K Seutloali --- School of Agricultural, Earth and Environmental Sciences, South Africa S Adelabu --- Department of Geography, South Africa C Shoko --- School of Bioresources Engineering and Environmental Hydrology, South AfricaWater quality deterioration in sub-Saharan Africa has attained a scale that requires scientific intervention. It is therefore important to devise appropriate and reliable techniques to investigate the water quality of lakes and reservoirs for the development of water resource management... -
First record of the Southeast Asian walking catfish, Clarias batrachus (Pisces: Clariidae), from the island of Mauritius, south-western Indian Ocean
Item type: Journal Article • Journal: African Zoology • Authors: Irfan Nunkoo --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South Africa Cecile Reed --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South Africa Sven Kerwath --- Marine Research Institute, Department of Biological Sciences, University of Cape Town, South AfricaThe presence of Southeast Asian walking catfish, Clarias batrachus, in Mauritian freshwater systems has been confirmed. Three female Clarias batrachus were caught in Rivière Sèche, close to the town of Phoenix, Mauritius (20°17′ S, 57°33′ E). This constitutes the first... -
A morphological description of the sagittal otoliths of two mormyrids, Marcusenius macrolepidotus and Petrocephalus catostoma (Family: Mormyridae)
Item type: Journal Article • Journal: African Zoology • Authors: N.N. Nicolaai --- Department of Zoology and Biology, South Africa A. Jooste --- Department of Zoology and Biology, South AfricaThe morphology of the sagittal otoliths of two South African mormyrid fish, Marcusenius macrolepidotus and Petrocephalus catostoma, were studied to determine possible morphological significance. The sagittae of M. macrolepidotus and P. catostoma are kidney-shaped and oblong, respectively. The ventral margin... -
Studies on aspects of the biology of Tilapia mariae (Boulenger, 1899) (Osteichthyes Cichlidae) in Ethiope River, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Zoology • Authors: Robert B. Ikomi --- Department of Zoology, Nigeria Happy O. Jessa --- Department of Zoology, NigeriaAspect of the biology of Tilapia mariae Boulenger, 1899, in Ethiope River were examined. T. mariae was captured in the river throughout the year and constituted about 31% of the cichlid catch. It attained a standard length of 17.5 cm;... -
Trematode infection among freshwater gastropods in Tessaout Amont irrigation system, Morocco
Item type: Journal Article • Journal: African Zoology • Authors: Hammou Laamrani --- Ministry of Education, Morocco Eline Boelee --- Department of Parasitology, Faculty of Medicine, the Netherlands Henry Madsen --- Danish Bilharziasis Laboratory, DenmarkIn the summer of 1994 and the spring of 1995, a snail survey aimed at determining relationships between the distribution of molluscan fauna, various environmental factors and trematode infection was carried out in the Tessaout Amont irrigation system, Morocco. The... -
Description and ecology of larvae of Glossogobius callidus and Redigobius dewaali (Gobiidae) from temperate South African estuaries
Item type: Journal Article • Journal: African Zoology • Authors: Nadine A. Strydom --- South African Institute for Aquatic Biodiversity, South Africa Francisco J. Neira --- Marine Research Laboratories, Tasmanian Aquaculture and Fisheries Institute (TAFI), University of Tasmania, AustraliaThis paper describes the morphology and ecology of the larvae and early juveniles of two common gobiids in warm temperate South African estuaries. The early developmental stages of Glossogobius callidus and Redigobius dewaali were collected during plankton surveys in seven... -
Waterfowl abundance and diversity in relation to season, wetland characteristics and land-use in semi-arid South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Ashley A. Raeside --- Department of Biology, Canada Scott A. Petrie --- Long Point Waterfowl and Wetlands Research Fund, Bird Studies Canada, Canada Thomas D. Nudds --- Department of Integrative Biology, Ecology Group, CanadaWe studied waterfowl abundance and diversity in relation to season (wet vs dry), wetland characteristics (vegetation and morphometrics) and land-use in a semi-arid agricultural region of South Africa to determine how waterfowl respond to various wetland characteristics, particularly those of... -
Plankton dynamics associated with the convergence zone of a shear front in the permanently open Kowie Estuary, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: M. Kruger --- Department of Ichthyology and Fisheries Science, South Africa N. A. Strydom --- Department of Zoology, South AfricaEstuarine frontal systems are thought to play an important role in plankton accumulations in estuaries. However, knowledge surrounding these estuarine circulation patterns is not clear, and consensus regarding the importance of fronts has yet to be reached. A full appraisal... -
Conservation status and distribution of freshwater fishes in South African national parks
Item type: Journal Article • Journal: African Zoology • Authors: I. A. Russell --- South African National Parks, South AfricaThirteen of South Africa’s national parks contain aquatic systems which support 63 indigenous and 11 alien freshwater fishes. Indigenous fishes include 43 species of the Zambezian faunal group (70% of the national total), eight Karroid (47%), five Cape (31%) and... -
Invasive alien freshwater fishes in the Wilderness Lakes System, a wetland of international importance in the Western Cape Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: A. A. Olds --- Department of Ichthyology and Fisheries Science, South Africa M. K. S. Smith --- South African National Parks, Scientific Services, South Africa O. L. F. Weyl --- South African Institute for Aquatic Biodiversity, South Africa I. A. Russell --- South African National Parks, Scientific Services, South AfricaThe Wilderness Lakes System incorporates a RAMSAR listed wetland. Previous ichthyological surveys reported three invasive freshwater fishes; Oreochromis mossambicus (Mozambique tilapia), Gambusia affinis (mosquitofish) and Micropterus salmoides (largemouth bass) from this system. To assess the status of these alien fishes,... -
Diet of largemouth bass, Micropterus salmoides (Centrarchidae), an invasive alien in the lower reaches of an Eastern Cape river, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: R.J. Wasserman --- Department of Zoology, South Africa N.A. Strydom --- Department of Zoology, South Africa O.L.F Weyl --- South African Institute for Aquatic Biodiversity, South AfricaLargemouth bass (Micropterus salmoides) have been introduced to many South African river systems where they become invasive and pose a threat to native biota. The diets of small (32–138 mm TL) and large (192–448 mm TL) sized bass were analysed... -
Freshwater snail distribution related to environmental factors in Banco National Park, an urban reserve in the Ivory Coast (West Africa)
Item type: Journal Article • Journal: African Zoology • Authors: I.A. Camara --- Laboratoire d’Environnement et de Biologie Aquatique, Université d’Abobo-Adjamé, Y.K. Bony --- Laboratoire d’Environnement et de Biologie Aquatique, Université d’Abobo-Adjamé, D. Diomandé --- Laboratoire d’Environnement et de Biologie Aquatique, Université d’Abobo-Adjamé, O.E. Edia --- Laboratoire d’Environnement et de Biologie Aquatique, Université d’Abobo-Adjamé, F.K. Konan --- Laboratoire d’Environnement et de Biologie Aquatique, Université d’Abobo-Adjamé, C.N. Kouassi --- Centre National de Recherche Agronomique (CNRA), Programme Pêche et Aquaculture Continentales (PAC), G. Gouréne --- Laboratoire d’Environnement et de Biologie Aquatique, Université d’Abobo-Adjamé, J.P. Pointier --- Centre de Biologie et d’Ecologie Tropicale et Méditerranéenne, USR 3278 CNRS-EPHE, Université de Perpignan,Freshwater snails and environmental variables were studied at seven stations along the Banco River (Ivory Coast;West Africa) from March to October 2008. Two species (Physa marmorata (Physidae) and Bulinus forskalii (Planorbidae) were recorded only at one sampling site. This station... -
Freshwater invertebrates of sub-Antarctic Marion Island
Item type: Journal Article • Journal: African Zoology • Authors: Herbert J.G. Dartnall --- Department of Biological Sciences, Australia Valdon R. Smith --- Department of Botany and Zoology, South AfricaThe freshwater habitats (mires, streams, lakes, pools and wallows) on sub-Antarctic Marion Island were examined for invertebrates. Sixty-eight species were found, including 45 new records for the Island. Of these 56 were bona fide aquatic invertebrates, the rest being terrestrial... -
Integrating research with management: the case of Katavi National Park, Tanzania
Item type: Journal Article • Journal: African Zoology • Authors: T. Caro --- Department of Wildlife, Fish and Conservation Biology, U.S.A. M. Elisa --- Katavi National Park, Tanzania J. Gara --- Katavi National Park, Tanzania D. Kadomo --- Katavi National Park, Tanzania A. Martin --- Department of Wildlife, Fish and Conservation Biology, U.S.A. D. Mushi --- Katavi National Park, Tanzania C. Timbuka --- Katavi National Park, TanzaniaMany protected areas in Africa and elsewhere suffer from several external pressures making it difficult for management to set priorities. For example, aerial censuses show that many mammal populations in the Katavi-Rukwa ecosystem of western Tanzania are declining. Vehicle transect... -
Foraging at wastewater treatment works increases the potential for metal accumulation in an urban adapter, the banana bat (Neoromicia nana)
Item type: Journal Article • Journal: African Zoology • Authors: S. Naidoo --- School of Life Sciences, University of KwaZulu-Natal, South Africa D. Vosloo --- School of Life Sciences, University of KwaZulu-Natal, South Africa M. C. Schoeman --- School of Life Sciences, University of KwaZulu-Natal, South AfricaWastewater treatment works (WWTWs) are known to provide profitable foraging areas for insectivorous bats in Europe and the New World because of their association with high abundance of pollution-tolerant midges (Diptera). However, bats that feed on these insects may also... -
A study of moult-site fidelity in Egyptian geese, Alopochen aegyptiaca, in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Mduduzi Ndlovu --- Organisation for Tropical Studies/School of Animal, Plant and Environmental Sciences, University of Witwatersrand, South Africa Graeme S. Cumming --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Philip A. R. Hockey --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Mbongeni D. Nkosi --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South Africa Gregory L. Mutumi --- Percy FitzPatrick Institute, DST/NRF Centre of Excellence, University of Cape Town, South AfricaLittle is known about moult and moult-site fidelity of African waterfowl. Satellite telemetry and uniquely engraved colour-rings were used to study moult-site fidelity of Egyptian geese marked at two sites in South Africa – Barberspan in the summer-rainfall region and... -
Preliminary evaluation of the impact of invasive smallmouth bass Micropterus dolomieu on native fish abundance in the Witte River, Cape Floristic Region, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Jeremy M. Shelton --- Department of Biological Sciences, South Africa Jenny A. Day --- Department of Biological Sciences, South Africa N. Dean Impson --- CapeNature Scientific Services, South AfricaThe impact of invasive smallmouth bass, Micropterus dolomieu, on the abundance of two native fish species, Breede River redfin, Pseudobarbus burchelli, and Cape kurper, Sandelia capensis, was investigated in the Witte River tributary of the Breede River in South Africa’s... -
Fluctuations in bird numbers on sewage treatment ponds in an arid environment, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: W Richard J Dean --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Suzanne J Milton --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Hugh P Forsyth --- , South Africa Dorrien R Tissiman --- , South AfricaRegular twice-monthly counts of birds associated with water at the Prince Albert sewage disposal facility recorded 69 species, of which 16 species (23.5%) were waterbirds (ducks, Red-knobbed Coot Fulica cristata and Little Grebe Tachybaptus ruficollis) and 21 species were shorebirds... -
A novel methodology for the rapid assessment of waterbird vulnerability to disturbance
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Kate JH England --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Colin Jackson --- A Rocha Kenya, Mwamba Bird Observatory and Field Study Centre, Kenya Philip AR Hockey --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South AfricaA methodology for rapidly assessing the vulnerability of waterbirds to disturbance was tested at Sabaki estuary, Kenya. Three variables were employed to measure the responses of 15 species: (1) bird density, (2) minimum distance of birds from a stationary disturbance... -
Movement ecology of five Afrotropical waterfowl species from Malawi, Mali and Nigeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: John Y Takekawa --- US Geological Survey, USA Shane R Heath --- US Geological Survey, USA Samuel A Iverson --- US Geological Survey, USA Nicolas Gaidet --- CIRAD, UPR AGIRs, Campus international de Baillarguet, France Julien Cappelle --- CIRAD, UPR AGIRs, Campus international de Baillarguet, France Tim Dodman --- Hundland, UK Ward Hagemeijer --- Wetlands International, The Netherlands William D Eldridge --- US Fish and Wildlife Service, USA Scott A Petrie --- Long Point Waterfowl, Canada Gregory S Yarris --- US Geological Survey, USA Shiiwua Manu --- AP Levantis Ornithological Research Institute, Nigeria Glenn H Olsen --- US Geological Survey, USA Diann J Prosser --- US Geological Survey, USA Kyle A Spragens --- US Geological Survey, USA David C Douglas --- US Geological Survey, USA Scott H Newman --- Food and Agriculture Organization of the United Nations, VietnamHabitat availability for Afrotropical waterbirds is highly dynamic with unpredictable rainfall patterns and ephemeral wetlands resulting in diverse movement strategies among different species. Movement strategies among waterfowl encompass resident, regional and intercontinental migrants, but little quantitative information exists on their... -
The effect of nitrogen and sulphur on the agronomical and water use efficiencies of canola (Brassica napus L.) grown in selected localities of the Western Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Wonder Ngezimana --- Department of Agronomy, South Africa Gert A Agenbag --- Department of Agronomy, South AfricaThe grain yield per unit of plant-available nitrogen (N) and sulphur (S) nutrients in the soil is usually low in most crops, including canola. Besides the ability of different crops in utilising nutrients, soil and climatic conditions can also influence... -
Benthic macroinvertebrate assemblage composition and distribution pattern in the upper Mthatha River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AS Niba --- Department of Biological and Environmental Science, South Africa SP Mafereka --- Department of Biological and Environmental Science, South AfricaBenthic macroinvertebrates were sampled and environmental variables measured at Langeni Forest and Kambi Valley, two sites of varying degrees of human impact in the upper Mthatha River, South Africa, in 2010–2011. Four species, Simulium adersi Pomeroy, Baetis harrisoni Barnard, Pseudocloeon... -
Polycyclic aromatic hydrocarbons in water, sediment and fish from the Warri River at Ubeji, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MC Asagbra --- Ecology and Environmental Biology Research Unit, Department of Zoology, Nigeria AS Adebayo --- Cell Biology and Genetics Unit, Department of Zoology, Nigeria CI Anumudu --- Cell Biology and Genetics Unit, Department of Zoology, Nigeria OA Ugwumba --- Hydrobiology and Fisheries Research Unit, Department of Zoology, Nigeria AAA Ugwumba --- Hydrobiology and Fisheries Research Unit, Department of Zoology, NigeriaThe Warri River at Ubeji, Nigeria, receives pollutants from an oil refinery. The levels of 16 priority polycyclic aromatic hydrocarbons (PAHs) in water, sediment and the tissue of tilapia from the Warri River were investigated in 2010 using gas chromatography... -
The role of the hospitality industry in balanced use of natural resources on Bali
Item type: Journal Article • Journal: • Authors: Lonneke Klein-Aarts --- W2A, Water2All, Amsterdam, The NetherlandsPopular tropical islands often face problems with water supply, especially islands like Bali where 80% of the economy depends on tourism and a healthy water supply. Mismanagement of natural water resources leads to a water crisis. This articles focus on... -
Southern African pasture and forage science entering the 21st century: past to present
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Wayne F Truter --- Department of Plant Production and Soil Science, South Africa Philip R Botha --- Directorate Plant Sciences, Western Cape Department of Agriculture, South Africa Chris S Dannhauser --- Grass SA, Waverley, South Africa Barbara V Maasdorp --- Department of Crop Science, Zimbabwe Neil Miles --- South African Sugarcane Research Institute, South Africa Albert Smith --- Stats4science, South Africa Hennie A Snyman --- Department of Animal, Wildlife and Grassland Sciences, South Africa Neil M Tainton --- Amber Valley, South AfricaGiven the global challenges of mitigating and alleviating land degradation and ensuring food security, particularly through protein production, pasture and forage science together with rangeland science will remain imperative to sustainable livestock production systems. Recognising the scientific principles developed in... -
Ecosystem-specific water quality indices
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I Rangeti --- Department of Community Health Studies, South Africa B Dzwairo --- Institute for Water and Wastewater Technology, South Africa GJ Barratt --- Department of Community Health Studies, South Africa FAO Otieno --- Technology, Innovation and Partnerships, South AfricaThe water quality index (WQI) has emerged as a central tool for analysing and reporting quality trends since 1965. It provides a better overview of water quality variability in a catchment than conventional monitoring programmes that use individual variables. Since... -
Application of multivariate statistics and toxicity indices to evaluate the water quality suitability for fish of three rivers in the Kruger National Park, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Gerber --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Unit for Environmental Sciences and Management, South Africa NJ Smit --- Unit for Environmental Sciences and Management, South AfricaThe water quality of the Olifants, Letaba and Luvuvhu rivers within the Kruger National Park was assessed for their suitability to sustain fish populations. Since water quality assessments result in huge datasets, principal component analysis and an aquatic toxicity index... -
Impact of land use on water quality in the Likangala catchment, southern Malawi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Pullanikkatil --- Department of Geography and Environmental Sciences, South Africa LG Palamuleni --- Department of Geography and Environmental Sciences, South Africa TM Ruhiiga --- Department of Geography and Environmental Sciences, South AfricaIn southern Malawi, the Likangala River, which is important for irrigation, domestic use and fishing, is affected by various land uses along its catchment. The impact of urbanisation and agriculture on the water quality of this river was investigated in... -
Seasonal and genotypic variation of water-soluble polysaccharide content in leaves of Cyclocarya paliurus
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Xiangxiang Fu --- Co-Innovation Center for Sustainable Forestry in Southern China, China Xiaodong Zhou --- Co-Innovation Center for Sustainable Forestry in Southern China, China Bo Deng --- Co-Innovation Center for Sustainable Forestry in Southern China, China Xulan Shang --- Co-Innovation Center for Sustainable Forestry in Southern China, China Shengzuo Fang --- Co-Innovation Center for Sustainable Forestry in Southern China, ChinaCyclocarya paliurus (Batal) Iljinskaja is an important medicinal woody plant due to numerous bioactive natural products in its leaves. As an important bioactive natural product, water-soluble polysaccharides (WSP) in leaves of C. paliurus possess diverse biological activities, such as hypoglycemic,... -
Factors affecting nesting success in the Great-crested Grebe Podiceps cristatus at Lake Tonga, north-east Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Sarra Cheriet --- Department of Ecology, FSNV-STR, Algeria Farrah Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, Algeria Ahmed H Alfarhan --- Center of Excellence for Research in Biodiversity, Saudi Arabia Boudjéma Samraoui --- Laboratoire de Recherche et de Conservation des Zones Humides, AlgeriaThe breeding ecology of the Great-crested Grebe Podiceps cristatus was investigated over four consecutive years (2009-2012) at Lake Tonga, north-east Algeria. In all four years, the egg-laying period was relatively short, spanning two months (end of March to end of... -
A computer-aided framework for subsurface identification of white shark pigment patterns
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Dureuil --- Department of Biology, Canada AV Towner --- Dyer Island Conservation Trust, South Africa LG Ciolfi --- Center for Marine Biology, Brazil LA Beck --- Department of Biology, GermanySubsurface video footage can be used as a successful identification tool for various marine organisms; however, processing of such information has proven challenging. This study tests the use of automated software to assist with photo-identification of the great white shark... -
Locating bilharzia transmission sites in South Africa: guidelines for public health personnel
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: Chris Appleton --- School of Life Sciences, Nelson Miranda --- Department of Zoology, South AfricaBilharzia surveillance at local authority level in South Africa relies on public health personnel being able to locate transmission sites. Although several methods have been tried, the method of choice is collecting snails, identifying those that serve as intermediate hosts... -
Wastewater and solid waste disposal patterns of Dukem town households in Ethiopia
Item type: Journal Article • Journal: Southern African Journal of Epidemiology and Infection • Authors: A Mohammed --- Department of Health Studies, Lindiwe Zungu --- Department of Health Studies, M.E. Hoque --- Graduate School of Business and Leadership, University of KwaZulu-Natal (Westville Campus),The objective of this descriptive, cross-sectional study was to assess wastewater and solid waste management by the households of Dukem, a town in Ethiopia. A total of 391 households were selected using stratifed random sampling techniques. Face-to-face interviews were carried... -
Prospects of prepaid smart water metering in Harare, Zimbabwe
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Tazviona Richman Gambe --- Department of Rural and Urban Development, ZimbabweDilapidated water distribution networks and water theft have resulted in non-revenue water (NRW) being between 40% and 60% of available supplies, yet Harare Water (a department under the City of Harare responsible for water purification and distribution) is struggling to... -
A preliminary investigation of the effects of an Inter Basin Transfer on the ichthyofauna of a small river in northern KwaZulu-Natal,South Africa
Item type: Journal Article • Journal: African Zoology • Authors: A. Viljoen [AN0001] D.P. Cyrus --- Coastal Research Unit of Zululand, South AfricaA study was carried out to provide baseline data so that future impacts of an Inter Basin Transfer on the fish fauna of the Mvuzana River could be assessed. Seven species of fish were recorded, and all were present under... -
Ecophysiology of Acacia species in wet–dry tropical plantations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Alieta Eyles --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Paul Drake --- Cooperative Research Centre for Forestry, Australia Le Thanh Quang --- Forest Science Sub-Institute of South Vietnam, Vietnam Pham Van Bon --- Forest Science Sub-Institute of South Vietnam, Vietnam Daniel Mendham --- CSIRO Ecosystems Sciences, Australia Don White --- CSIRO Ecosystems Sciences, Australia Kieu Tuan Dat --- Forest Science Sub-Institute of South Vietnam, Vietnam Pham The Dung --- Forest Science Sub-Institute of South Vietnam, Vietnam Chris Beadle --- Tasmanian Institute of Agriculture, University of Tasmania, AustraliaSelected tropical Acacia species are used extensively for short-rotation plantation forestry in many parts of Asia and, to a limited degree, in Australia. We explored leaf-level photosynthetic activity and leaf water potential (Ψleaf) of three field-grown Acacia tree species (aged... -
The role of waterbirds in the dispersal of freshwater cladocera and bryozoa in southern Africa
Item type: Journal Article • Journal: African Zoology • Authors: Chevonne Reynolds --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Graeme S Cumming --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South AfricaIt has long been presumed that waterbirds disperse the propagules of aquatic organisms. However, it is only in recent years that this claim has been empirically explored and little is still known about waterbird-mediated dispersal in southern Africa. Aquatic invertebrates... -
Post-fire vegetative recruitment of the alien grass Glyceria maxima at a KwaZulu-Natal Midlands dam, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LF Mugwedi --- School of Animal, Plant and Environmental Sciences, South Africa JM Goodall --- School of Animal, Plant and Environmental Sciences, South Africa ETF Witkowski --- School of Animal, Plant and Environmental Sciences, South Africa MJ Byrne --- Centre of Excellence for Invasion Biology, South AfricaAn accidental fire at a site where the reproductive behaviour of Glyceria maxima was being investigated provided an opportunity to measure its effect on G. maxima vegetative recruitment. The fire burned G. maxima growing along the water's edge and down... -
Diatoms as water quality indicators in the upper reaches of the Great Fish River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Holmes --- School of Biological Sciences, South Africa JC Taylor --- School of Biological Sciences, South AfricaThis study focused on the spring-fed upper reaches of the economically important Great Fish River with the aim of determining if diatoms could be used for biomonitoring in semi-arid conditions in southern Africa. Five sites were monitored monthly from 2010... -
Changes in the algal composition and water quality of the Sundays River, Karoo, South Africa, from source to estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Janse van Vuuren --- Unit for Environmental Sciences and Management, South Africa JC Taylor --- Unit for Environmental Sciences and Management, South AfricaA first survey was done on algae present in the Sundays River from its source to its confluence with the sea. Species found in the upstream sections of the river included indicators of good water quality, but the quality deteriorated... -
Occurrence, abundance and distribution of benthic macroinvertebrates in the Nyando River catchment, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DA Abong'o --- Department of Chemistry, School of Physical Sciences, Kenya SO Wandiga --- Department of Chemistry, School of Physical Sciences, Kenya IO Jumba --- Department of Chemistry, School of Physical Sciences, Kenya PJ Van den Brink --- Aquatic Ecology and Water Quality Management Group, The Netherlands BB Naziriwo --- Department of Chemistry, Uganda VO Madadi --- Department of Chemistry, School of Physical Sciences, Kenya GA Wafula --- Department of Chemistry, School of Physical Sciences, Kenya P Nkedi-Kizza --- Soil and Water Science Department, USA H Kylin --- Department of Water and Environmental Studies, SwedenA baseline study was conducted of the occurrence of macroinvertebrates at 26 sites in the Nyando River catchment in 2005–2006. A total of 13 orders and 16 families of Arthropoda, Mollusca, Platyhelminthes and Annelida were collected, with the order Ephemeroptera... -
Impact of rainfall variability on groundwater levels in Ruiru municipality, Kenya
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: R.M. Nyakundi --- Department of Civil, Construction and Environmental Engineering, Kenya M. Makokha --- Department of Water Engineering and Technology, Kenya J.K. Mwangi --- Department of Civil, Construction and Environmental Engineering, Kenya C. Obiero --- Department of Land Resource Planning and Management, KenyaGroundwater accounts for the largest fresh water resources in the world. However, there has been limited exploitation of this vital resource in many areas. Where groundwater resources have been utilised, they have been over-exploited, polluted, wasted and mismanaged. In Ruiru... -
The use of technology in a water treatment process
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Magdi Osman Ali --- Faculty of Science and Arts and Community - Muhyil Assir, Saudi Arabia Abdalrasol J. Alzubaidi --- Faculty of Engineering, SudanAutomation is an essential part of producing drinking water in the necessary quantities at the right time with high levels of efficiency in water production, energy and chemical materials consumption. The primary objective of this paper is to propose strategies... -
Appraisal of access to safe drinking water in southwest Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Adedayo A. Badejo --- Civil Engineering Department, Faculty of Engineering and the Built Environment, South Africa Julius M. Ndambuki --- Civil Engineering Department, Faculty of Engineering and the Built Environment, South Africa Williams K. Kupolati --- Civil Engineering Department, Faculty of Engineering and the Built Environment, South Africa Adebola A Adekunle --- Civil Engineering Department, College of Engineering, Nigeria Solomon A. Taiwo --- Civil Engineering Department, College of Engineering, Nigeria David O. Omole --- Civil Engineering Department, Faculty of Engineering and the Built Environment, South AfricaThe importance of developing effective water supply services is universally recognised as a basis for improving the overall health of the population. This study ascertained the quality of water supplied by a water treatment scheme in southwest Nigeria. One hundred... -
Soil water and mineral nitrogen content as influenced by crop rotation and tillage practice in the Swartland subregion of the Western Cape
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Japie D Wiese --- Department of Agronomy, South Africa Johan Labuschagne --- Directorate Plant Science, South Africa Gert A Agenbag --- Department of Agronomy, South AfricaAdoption of conservation agricultural practices, reduced tillage and crop rotation in the grain-producing areas of the Western Cape, South Africa, resulted in a gradual build-up of organic matter on the soil surface. It was expected that the increase in organic... -
Assessing the value of wetlands to waterbirds: exploring a population-based index at flyway and regional levels
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Doug M Harebottle --- Animal Demography Unit, Department of Biological Sciences, South Africa Les G Underhill --- Animal Demography Unit, Department of Biological Sciences, South AfricaTraditionally, species richness, species diversity, total count, biomass, energy consumption and the Ramsar ‘1% threshold’ have been used to assess the importance of wetlands for waterbirds. Designation of wetlands of international importance (Ramsar sites) based on waterbirds has focused on... -
Metal enrichment in water and fish in a semi-urban Nigerian lake, and their associated risks
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CD Ezeonyejiaku --- Department of Zoology, Nigeria MO Obiakor --- School of Environmental and Rural Science, AustraliaTrace metal (Zn, Pb, Cu, Cr and Cd) concentrations in the water column and in the liver, muscle and gill tissues of Parachanna obscura and Clarias gariepinus in Agulu Lake, Nigeria, were investigated in June 2014 and compared with WHO... -
Reflooding the Faguibine floodplain system, northern Mali: potential benefits and challenges
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: O Hamerlynck --- Kenya Wetlands Biodiversity Research Team, Kenya SA Moulaye Zeine --- Global Monitoring, Mauritania JY Mutua --- Kenya Wetlands Biodiversity Research Team, Kenya LV Mukhwana --- Kenya Wetlands Biodiversity Research Team, Kenya M Yéna --- Direction Nationale de l’Hydraulique du Mali, MaliThe Faguibine system, northern Mali, consists of a series of interconnected floodplains of which the flooded surface area declined from about 1 000 km² in the late 19th century to only some 90 km² in 2010. Flood extent depends on... -
Have grass carp driven declines in macrophyte occurrence and diversity in the Vaal River, South Africa?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSR Weyl --- Zoology and Entomology Department, South Africa GD Martin --- Zoology and Entomology Department, South AfricaThe Vaal River, South Africa, historically had a rich diversity of native submerged macrophytes with at least 13 species from 5 families recorded. Over the past 10 years there has been a noticeable reduction in the occurrence and diversity of... -
Field evaluation of deficit irrigation effects on tomato growth performance, water-use efficiency and control of parasitic nematode infection
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Osama Mohawesh --- Department of Plant Production, JordanTwo field experiments were conducted using a common tomato cultivar (GS12) to assess the effect of deficit irrigation (DI) regimes on tomato growth performance, and on root-knot nematode Meloidogyne javanica galling and abundance. Irrigation treatments consisted of five irrigation regimes:... -
Past and present fish species recorded in the estuarine Lake Ichkeul, northern Tunisia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Shaiek --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), Tunisia C Fassatoui --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), Tunisia MS Romdhane --- Research Unit Ecosystems and Aquatic Resources (UR13AGRO1), National Agronomy Institute of Tunisia (INAT), TunisiaLake Ichkeul in northern Tunisia is a Ramsar site, a MAB Biosphere Reserve and a UNESCO World Heritage Site. The system is one of the most important coastal wetlands in North Africa, especially as an over-wintering area for migratory birds,... -
Characterisation of a Tunisian coastal lagoon through hyperspectral underwater irradiance
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DH Nourisson --- Department of Biology, Italy F Scapini --- Department of Biology, Italy L Massi --- Department of Biology, Italy L Lazzara --- Department of Biology, ItalyNorth African coastal lagoons are unique ecosystems that often suffer degradation due to human activities. Therefore, monitoring methods are required to identify stressors and assist with the management of these valuable and often understudied ecosystems. A synthetic indicator of water... -
Histopathological biomarkers and genotoxicity in gill and liver tissues of Nile tilapia Oreochromis niloticus from a polluted part of the Nile River, Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AA Baiomy --- Zoology Department, EgyptFish health is affected by water pollution. Oreochromis niloticus collected during summer 2014 from El-Serw, a polluted site on the Nile River, were compared with fish from a reference site, El-Zamalek. Histopathological changes were detected in gill and liver tissue... -
Variation of physico-chemical parameters along a river transect through the Okavango Delta, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Gondwe --- University of Botswana, Okavango Research Institute, Botswana WRL Masamba --- University of Botswana, Okavango Research Institute, BotswanaThe Okavango Delta depends on water quantity and quality to sustain its ecosystem services. Whereas many studies have been carried out on its hydrology, few have been done on water quality in the delta. Water pH, electrical conductivity (EC), dissolved... -
Development of predictive equations for total body water using the deuterium-dilution method as the gold standard in a population of asymptomatic HIV-positive Zulu women in South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: G. Kindra --- Department of Paediatrics and Child Health, Nelson R Mandela School of Medicine, A. Coutsoudis --- Department of Paediatrics and Child Health, Nelson R Mandela School of Medicine, L. Pillay --- Department of Chemistry, A. Kindness --- Department of Chemistry,Objectives: The study aimed to derive predictive equations for total body water determinations with bioelectrical impedance and anthropometric measurements in a population of asymptomatic human immunodeficiency virus (HIV) -positive Zulu women. -
A system-level modelling perspective of the KwaZulu-Natal Bight ecosystem, eastern South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: UM Scharler --- School of Life Sciences, South Africa RC van Ballegooyen --- Coastal Systems Research Group, South Africa MJ Ayers --- School of Life Sciences, South AfricaThe KwaZulu-Natal Bight comprises the only sizeable shelf region on the eastern coast of South Africa, and is influenced by both the Agulhas Current on its seaward side and rivers and estuaries on its landward side. Established knowledge of the... -
Effects of land-use changes on benthic macroinvertebrate assemblages in the tropical Umfurudzi River, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Bere --- Chinhoyi University of Technology, Zimbabwe G Chiyangwa --- Chinhoyi University of Technology, Zimbabwe T Mwedzi --- Chinhoyi University of Technology, ZimbabweThe responses of benthic macroinvertebrates to land-use-induced changes in water quality and habitat because of contrasting land-use types along the Umfurudzi River, Zimbabwe, were investigated in 2013. Five stations in a communal area upstream of Umfurudzi National Park, four on... -
Mapping inundation extent, frequency and duration in the Okavango Delta from 2001 to 2012
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Thito --- University of Botswana, Okavango Research Institute, Botswana P Wolski --- Climate System Analysis Group, University of Cape Town, South Africa M Murray-Hudson --- University of Botswana, Okavango Research Institute, BotswanaThe frequency and duration of inundation in river systems are important for a variety of applications, such as water resource management, floodplain mapping and habitat restoration. The Okavango Delta, the fifth largest Ramsar site in the world, has experienced a... -
Efficacy and deficiencies of rapid biomonitoring in biodiversity conservation: a case study in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HM Barber-James --- Department of Freshwater Invertebrates, South Africa LL Pereira-da-Conceicoa --- Department of Zoology and Entomology, South AfricaRapid biomonitoring protocols, using biotic indices based on macroinvertebrate diversity to assess river ecosystem health, are widely used globally. Such quick assessment techniques are lauded for the rapid results obtained and the relatively easy protocol used to achieve an answer... -
Comparative performance of four survey methods for assessing Lilian’s Lovebird abundance in Liwonde National Park, Malawi
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Tiwonge I Mzumara --- School of Life Sciences, South Africa Michael R Perrin --- School of Life Sciences, South Africa Colleen T Downs --- School of Life Sciences, South AfricaMonitoring abundance of threatened species is important for conservation planning. Lilian’s Lovebird Agapornis lilianae is a near-threatened small parrot found in mopane Colophospermum mopane woodland. Its population has not been investigated in any part of its range. We investigated the... -
Wintering waterbird assemblages in the central part of the Gulf of Gabès in southern Tunisia
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Foued Hamza --- Département des Sciences de la Vie, Faculté des Sciences de Gabès, Tunisia Abdessalem Hammouda --- Département des Sciences de la Vie, Faculté des Sciences de Gabès, Tunisia Slaheddine Selmi --- Département des Sciences de la Vie, Faculté des Sciences de Gabès, TunisiaAlthough the Gulf of Gabès is recognised as an Important Bird Area, several aspects of the ecology of waterbirds inhabiting this area still need to be investigated. We observed how waterbird foraging guilds varied among habitats. In total, 49 species... -
Comparison of lung ultrasound with transpulmonary thermodilution in assessing extra-vascular lung water
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Jody G Davids --- Faculty of Health Sciences, Department of Anaesthesiology, South Africa Edwin W Turton --- Faculty of Health Sciences, Department of Anaesthesiology, South Africa Jacques E Raubenheimer --- Faculty of Health Sciences, Department of Biostatistics, South AfricaBackground: Increased extra-vascular lung water (EVLW) is common in critical care and correlates with the severity of acute lung injury, length of intensive care unit stay and mortality. Lung ultrasound (LUS) can assess EVLW by determining the amount of ‘B-lines’:... -
The annual pattern of sap flow in two Eucalyptus species established in the vicinity of gold-mine tailings dams in central South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Peter Dye --- Ecological Engineering and Phytotechnology Programme, Restoration and Conservation Biology Research Group, School of Animal, Plant and Environmental Sciences, South Africa Alistair Clulow --- Agrometeorology, South Africa Eric Prinsloo --- CSIR, Built Environment, South Africa Vivek Naiken --- CSIR, Natural Resources and the Environment, c/o Agrometeorology, South Africa Isabel Weiersbye --- Ecological Engineering and Phytotechnology Programme, Restoration and Conservation Biology Research Group, School of Animal, Plant and Environmental Sciences, South AfricaSeveral hundred mine tailings dams occur in the Witwatersrand Basin Goldfields in central South Africa. Seepage of acid mine drainage (AMD) from these unlined structures is widespread, and a variety of contaminants is released into soil and groundwater. The ‘Mine... -
Water quality of the Luvuvhu River and its tributaries within the Thulamela Local Municipality, Limpopo Province, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mpho Monyai --- Department of Environmental Sciences, South Africa Rudzani A. Makhado --- Department of Environmental Sciences, South Africa Ntshenge O. Novhe --- Council for Geoscience, South AfricaThe study was conducted during dry and wet periods at the Luvuvhu River and its tributaries within the Thumalamela Local Municipality, Limpopo Province, South Africa. A total of 50 samples (25 per sampling session) were collected for physicochemical analysis at... -
Bioaccumulation of heavy metals in two morphotypes of African large barb Labeobarbus intermedius (Osteichthyes: Cyprinidae) in Lake Hawassa, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Sorsa --- Department of Biology, College of Natural and Computational Sciences, Ethiopia A Gezahagn --- Ethiopian Rift Valley Lakes Basin Authority, Ethiopia E Dadebo --- Department of Biology, College of Natural and Computational Sciences, EthiopiaWater and muscle tissue samples from two morphotypes of the African large barb Labeobarbus intermedius collected from three sites in Lake Hawassa in 2012–2013 were analysed for eight heavy metals, including Cd, Co, Cr, Cu, Mn, Ni, Pb and Zn... -
Harmful cyanobacteria and their cyanotoxins in Egyptian fresh waters – state of knowledge and research needs
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ZA Mohamed --- Department of Botany and Microbiology, Faculty of Science, EgyptCyanobacterial blooms have increased in freshwater ecosystems worldwide in the last century, mostly resulting from eutrophication and climate change. These blooms represent serious threats to environmental and human health because of the production of harmful metabolites, called cyanotoxins. Like many... -
Organochlorine pesticides in Cyprinus carpio from Sidi Salem Dam, north-western Tunisia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Mzoughi --- Institut National des Sciences et Technologies de la Mer, Laboratoire Milieu Marin, R Ennouri --- Institut National des Sciences et Technologies de la Mer, Laboratoire Milieu Marin, L Chouba --- Institut National des Sciences et Technologies de la Mer, Laboratoire Milieu Marin,Cyprinus carpio (Linnaeus, 1758) caught in Sidi Salem Dam in 2011 were analysed for the levels of organochlorine pesticides (OCPs), including hexachlorobenzene (HCB), aldrin, heptachlor, lindane, dieldrin, endrin, and pp′-DDT and its two main metabolites pp′-DDD and pp′-DDE, in order... -
The sensitivity of Afromontane tarns in the Maloti-Drakensberg region of South Africa and Lesotho to acidic deposition
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JA Dunnink --- Centre in Water Research and Development (CiWaRD) and Department of Geography, South Africa CJ Curtis --- Centre in Water Research and Development (CiWaRD) and Department of Geography, South Africa JP Beukes --- Unit for Environmental Sciences and Management, South Africa PG van Zyl --- Unit for Environmental Sciences and Management, South Africa J Swartz --- Unit for Environmental Sciences and Management, South AfricaDespite their remoteness from sources of atmospheric pollutant emissions, the Afromontane tarns in the Maloti-Drakensberg region are perfect candidates to study the negative effects of acidifying atmospheric pollution, because mountain lakes are widely recognised as sentinel ecosystems, unimpacted by direct... -
The effects of conservation tillage practices and fertiliser management on soil structural properties at an experimental farm
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Danie Beukes --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Corrie Swanepoel --- Agricultural Research Council–Institute for Soil, Climate and Water, South AfricaCrop rotation and reduced tillage under conservation agriculture (CA) practices may induce higher soil organic carbon (SOC) and nitrogen (N) levels compared with conventional (Con) tillage practices. Soil organic carbon may increase soil aggregate stability (AS). The study site was... -
The role of the hospitality industry in balanced use of natural resources on Bali
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Lonneke Klein-Aarts --- , The NetherlandsPopular tropical islands often face problems with water supply, especially islands like Bali where 80% of the economy depends on tourism and a healthy water supply. Mismanagement of natural water resources leads to a water crisis. This articles focus on... -
Cholera and household water treatment why communities do not treat water after a cholera outbreak: a case study in Limpopo Province
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: Lutendo Sylvia Mudau --- Norwich School of Medicine, UK Murembiwa Stanley Mukhola --- Norwich School of Medicine, UK Paul Raymond Hunter --- Norwich School of Medicine, UKBackground: Cholera is one of the common diseases in developing countries caused by consumption of contaminated and untreated drinking water. A study was conducted 7 months after a cholera outbreak in Vhembe district, Limpopo, South Africa. The aim of the study... -
Impact of pipe roughness on the performance of a water distribution network: A case study of the Westbury Network, Johannesburg, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Stephen Nyende-Byakika --- Department of Civil Engineering, South AfricaThe Westbury area, a suburb of the city of Johannesburg, is characterized by a very old pipe network, high water losses as well as high operating and maintenance costs. Consequently, a network rehabilitation project was proposed for the area, with... -
Plastic waste as strength modifiers in asphalt for a sustainable environment
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Adedayo A. Badejo --- Department of Civil Engineering, Nigeria Adebola A. Adekunle --- Department of Civil Engineering, Nigeria Olusola O. Adekoya --- Department of Civil Engineering, Nigeria Julius M. Ndambuki --- Department of Civil Engineering, South Africa Kehinde W. Kupolati --- Department of Civil Engineering, South Africa Babatunde S. Bada --- Department of Environmental Management and Toxicology, Nigeria David O. Omole --- Department of Civil Engineering, NigeriaThis research took the form of an investigation into the applicability of polyethylene terephthalate (PET) as strength modifiers in asphalt road construction. Samples of thoroughly washed, naturally dried and shredded PET wastes were collected. The optimum binder content (OBC) of... -
Wind energy potential and economic evaluation of WPS using WECSs in three selected locations of Northern Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Shiva Prashanth Kumar Kodicherla --- Department of Civil Engineering, College of Engineering & Technology, Ethiopia Satyanarayana Gaddada --- Department of Electrical and Computer Engineering, College of Engineering & Technology, Ethiopia Nagaraju Shaik --- Department of Construction Management, College of Engineering & Technology, EthiopiaThis paper analyzes wind energy potential and economic evaluation of water pumping system (WPS) employed by various wind energy conversion systems (WECSs). The wind speed data gathered from three different locations of Northern Ethiopia are analyzed using the Weibull probability... -
Periphytic diatom communities in tributaries around Lake Ichkeul, northern Tunisia: a preliminary assessment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Ouchir --- Department of Earth Sciences F.S.B, Tunisia S Morin --- Unité de Recherche EABX, France L Ben Aissa --- Department of Earth Sciences F.S.B, Tunisia M Boughdiri --- Department of Earth Sciences F.S.B, Tunisia A Aydi --- Department of Earth Sciences F.S.B, TunisiaAn initial inventory of diatom biodiversity at 12 sites draining into Lake Ichkeul, northern Tunisia, was performed in summer 2014, together with the characterisation of metal pollution status by analysing trace metal concentrations to determine Water Quality Indices. The maximum... -
Use of a chimeric transgene construct to confer broad resistance in zucchini (Cucurbita pepo L.) plants against cucurbit-infecting potyviruses occurring in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jacques D Ibaba --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South Africa Benice J Sivparsad --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South Africa Mark D Laing --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South Africa Augustine Gubba --- Discipline of Plant Pathology, School of Agriculture, Earth and Environmental Sciences, College of Agriculture and Environmental Sciences, South AfricaThe frequent identification of cucurbit-infecting viruses across the province of KwaZulu-Natal (KZN) in South Africa necessitates developing effective methods of controlling these diseases. Putative transgenic baby marrow (Cucurbita pepo L.) plants resistant to Zucchini yellow mosaic virus (ZYMV), Moroccan watermelon... -
Vegetative growth of Amaranthus hybridus and Amaranthus tricolor under different watering regimes in different seasons in southern Mozambique
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jerónimo EMM Ribeiro --- Department of Agronomy, South Africa Petrus J Pieterse --- Department of Agronomy, South Africa Sebastião I Famba --- Faculty of Agronomy and Forestry Engineering, MozambiqueDrought-tolerant crops with high nutritional value such as amaranth leafy vegetables have the potential to improve the diet of rural communities in dry semi-arid areas of southern Mozambique. A study was conducted aiming to assess the vegetative growth and leaf... -
Effectiveness of Moringa oleifera seed as a coagulant in domestic wastewater treatment
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: K. A. Adeniran --- Department of Agricultural and Biosystems Engineering, Nigeria T. D. Akpenpuun --- Department of Agricultural and Biosystems Engineering, Nigeria B. A. Akinyemi --- Department of Agricultural and Biosystems Engineering, Nigeria R. A. Wasiu --- Department of Agricultural and Biosystems Engineering, NigeriaAn investigation on the effectiveness of Moringa oleifera seed for the treatment of domestic sewage was carried out in 15 litres plastic pots. Completely randomized design (CRD) experimental design was adopted. The treatments included: the control culture (no Moringa seed),... -
Assessment of water quality in selected shallow wells of Keiyo Highlands, Kenya
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Peter K. Mbaka --- Department of Civil, Construction and Environmental Engineering, Kenya John K. Mwangi --- Department of Civil, Construction and Environmental Engineering, Kenya Clement K. Kiptum --- Department of Civil and Structural Engineering, KenyaA supply of potable water is important for the sustenance of a healthy population. This study was conducted in the Keiyo Highlands, Elgeyo Marakwet County, in Kenya. The aim was to assess seasonal variation in physico-chemical and microbiological water quality... -
Significant genetic differentiation among meroplanktonic barrel jellyfish Rhizostoma pulmo (Cnidaria: Scyphozoa) in the Mediterranean Sea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AR Ben Faleh --- Marine Biology Unit, Faculty of Sciences of Tunis, Tunisia H Allaya --- Marine Biology Unit, Faculty of Sciences of Tunis, Tunisia A Armani --- FishLab, Department of Veterinary Sciences, Italy AAB Shahin --- Department of Zoology, Faculty of Science, EgyptMolecular data have shown that jellyfishes are more geographically restricted and evolutionarily divergent than previously thought. We examined genetic variation and divergence within the meroplanktonic barrel jellyfish Rhizostoma pulmo in the Mediterranean Sea; specific sampling areas were the northern Adriatic,... -
The ecological integrity of the Lower Olifants River, Limpopo province, South Africa: 2009–2015 – Part A: Olifants River main stem
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- South African Institute for Aquatic Biodiversity, South Africa TD Mohlala --- SAEON Ndlovu Node, Kruger National Park, South Africa A Swemmer --- SAEON Ndlovu Node, Kruger National Park, South AfricaThe major rivers of the South African ‘Lowveld’ (low-latitude savanna) suffer numerous impacts from upstream economic activities. Whereas monitoring these rivers is required to detect biodiversity losses, record pollution events and devise mitigation strategies, current monitoring programmes are inadequate. In... -
The ecological integrity of the lower Olifants River, Limpopo province, South Africa: 2009–2015 – Part B: Tributaries of the Olifants River
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- South African Institute for Aquatic Biodiversity, South Africa TD Mohlala --- SAEON Ndlovu Node, Kruger National Park, South Africa A Swemmer --- SAEON Ndlovu Node, Kruger National Park, South AfricaMonitoring on the Lowveld reaches of the Olifants River, Limpopo River System, and its Steelpoort, Blyde, Klaserie and Selati tributaries was initiated in 2009. Analysis of the 2009–2015 data from four Olifants River sites showed deterioration in the river’s ecological... -
Physico-chemical water characteristics and aquatic macroinvertebrates of Lake Tsimanampesotse, south-western Madagascar
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JR Rasoloariniaina --- Centre National de Recherches sur l’Environnement (CNRE), MadagascarSaline lakes are known to be amongst the most productive ecosystems in the world. Tsimanampesotse, a ‘conservation hotspot’ soda lake in southwestern Madagascar, was integrated into the Ramsar wetland network in 1998. Despite its importance for aquatic birds, knowledge of... -
Use of hydrogels in the planting of industrial wood plantations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jacob W Crous --- Sappi Forests, South AfricaThe quantity of available water in soil is crucial for plant growth, especially after transplanting as this water will enable the growth of new roots to facilitate nutrient and water uptake. Water absorbed by a hydrogel (superabsorbent polymer) has the... -
Eucalypt plantation management in regions with water stress
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: José LM Gonçalves --- Department of Forest Science, Brazil Clayton A Alvares --- Institute of Forest Research and Study, Brazil José HT Rocha --- Department of Forest Science, Brazil Carolina B Brandani --- Department of Forest Science, Brazil Rodrigo Hakamada --- Department of Forest Science, BrazilMost eucalypt plantations are managed in short rotations (6–8 years) and are established in regions with water and nutritional stresses of varying degrees. The mean annual increment in these regions ranges from 20 to 45 m3 ha−1 y−1 depending on... -
Biomass production and potential water stress increase with planting density in four highly productive clonal Eucalyptus genotypes
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Rodrigo Hakamada --- Forest Resources Graduate Program, ‘Luiz de Queiroz’ College of Agriculture, Brazil Robert M Hubbard --- US Department of Agriculture Forest Service, USA Silvio Ferraz --- Forest Sciences Department, ‘Luiz de Queiroz’ College of Agriculture, Brazil José Luiz Stape --- Department of Forestry and Environmental Resources, USA Cristiane Lemos --- International Paper do Brasil, BrazilThe choice of planting density and tree genotype are basic decisions when establishing a forest stand. Understanding the interaction between planting density and genotype, and their relationship with biomass production and potential water stress, is crucial as forest managers are... -
Human health risks of metals and metalloids in muscle tissue of Synodontis zambezensis Peters, 1852 from Flag Boshielo Dam, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JR Sara --- Department of Biodiversity, South Africa SM Marr --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa WJ Smit --- Department of Biodiversity, South Africa LJC Erasmus --- Department of Physiology and Environmental Health, South Africa WJ Luus-Powell --- Department of Biodiversity, South AfricaMuscle tissue from 63 Synodontis zambezensis collected bimonthly in 2013 at Flag Boshielo Dam were analysed for metals and metalloids in a desktop human health risk assessment. The Hazard Quotient, based on a weekly meal of 67 g of fish... -
Water quality assessment of the Siluko River, southern Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IP Oboh --- Department of Animal and Environmental Biology, Faculty of Life Sciences, Nigeria CS Agbala --- Department of Animal and Environmental Biology, Faculty of Life Sciences, NigeriaThe water quality of the Siluko River, Edo State, Nigeria was investigated from March to August 2015 to determine its suitability for drinking and usage for domestic purposes. Water samples collected from three stations were tested for thirteen physico-chemical parameters... -
Key factors that drive phytoplankton biomass and community composition in the urbanised Nahoon Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Cotiyane --- Department of Botany, South Africa J Adams --- Department of Botany, South Africa A Rajkaran --- Department of Biodiversity and Conservation Biology, South AfricaEstuaries are under intense pressure, because of urban developments and water abstraction. Water column characteristics of the Nahoon Estuary were examined in 2014–2015 to identify factors that influenced phytoplankton dynamics. The estuary was found to be saline (∼33) and remained... -
Improving the performance of the EPT Index to accommodate multiple stressors in Afrotropical streams
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FO Masese --- Department of Fisheries and Aquatic Sciences, Kenya PO Raburu --- Department of Fisheries and Aquatic Sciences, KenyaThe EPT index (Ephemeroptera, Plecoptera and Trichoptera) may be skewed by the wide tolerance to multiple stressors of the Baetid, Caenid and Hydropsychid families, which affects the performance of the EPT index as an indicator of multiple stressors in aquatic... -
Retention of plastic-tipped dart tags in African tigerfish Hydrocynus vittatus
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FJ Jacobs --- Ministry of Fisheries and Marine Resources, Namibia OLF Weyl --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South Africa NS Libala --- Ministry of Fisheries and Marine Resources, Namibia GC O’Brien --- School of Life Sciences, South Africa CT Downs --- School of Life Sciences, South AfricaEstimates of tag retention and tagging-related mortality are essential for mark-recapture experiments. Mortality and tag loss were estimated from 15 tigerfish Hydrocynus vittatus marked using Hallmark model PDL plastic-tipped dart tags released into a 1 730 m2 pond at Kamutjonga... -
Distribution and breeding ecology of the Ferruginous Duck Aythya nyroca in Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Assia Djelailia --- Laboratoire de Conservation des Zones Humides, Algeria Nasser Baaziz --- Department of Animal Biology, Algeria Farrah Samraoui --- Laboratoire de Conservation des Zones Humides, Algeria Ahmed H Alfarhan --- Department of Botany and Microbiology, Saudi Arabia Boudjéma Samraoui --- Laboratoire de Conservation des Zones Humides, AlgeriaWe conducted a survey of the distribution of Ferruginous Duck Aythya nyroca across Algeria and analysed the influence of nest-site characteristics on nesting success at a Ramsar site, Lake Tonga. The species was found to occupy different wetlands (freshwater lakes,... -
Effect of frequency and height of cutting on growth parameters of Acacia saligna in Egypt
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Ahmed A Kandil --- Agronomy Department, Faculty of Agriculture, Egypt Ali E Sharief --- Agronomy Department, Faculty of Agriculture, EgyptTo revegetate acacia trees in saline desert sandy soils, field experiments were conducted to study the effect of cutting frequency and height on Acacia saligna productivity during 2014, 2015 and 2016. The tallest plants, thickest stems and highest values for... -
Contrasting hydrography and phytoplankton distribution in the upper layers of cyclonic eddies in the Mozambique Basin and Mozambique Channel
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa RG Barlow --- Marine Research Institute and Department of Oceanography, South AfricaHydrographic data collected in cyclonic eddies in the Mozambique Channel and Basin revealed notable differences in temperature and salinity at a depth of 100 m, the upper mixed layer, the nitracline depths, and vertical distribution of chlorophyll-a (Chl-a). Differences in... -
Heavy metal concentrations in, and human health risk assessment of, three commercially valuable fish species in the lower Niger River, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JC Madu --- Department of Zoology and Environmental Biology, Nigeria GE Odo --- Department of Zoology and Environmental Biology, Nigeria CN Asogwa --- Department of Zoology and Environmental Biology, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, NigeriaThe concentrations of Fe, Mn, Ni, Pb and V in water, sediment and the gill, liver and muscle tissues of Synodontis resupinatus, Heterotis niloticus and Clarias gariepinus, all commercially important fish species of the lower Niger River, were investigated in... -
Acoustic communication and reproductive behaviour in the aquatic frog Xenopus laevis (Pipidae), a field study
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Achim Ringeis --- , , Germany Birgit Krumscheid --- , , Germany Phillip J. Bishop --- , , New Zealand Christian de Vries --- , , Germany Andreas Elepfandt --- , , GermanyWe studied the acoustic and reproductive behaviour of the clawed frog, Xenopus laevis, in a pond with clear water in South Africa over a period of two months. It contained 21 adult males and females. Each was marked with a... -
Transport and transformation of surface water masses across the Mascarene Plateau during the Northeast Monsoon season
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Vianello --- Nansen-Tutu Centre for Marine Environmental Research, South Africa IJ Ansorge --- Department of Oceanography, Marine Research Institute, South Africa M Rouault --- Nansen-Tutu Centre for Marine Environmental Research, South Africa M Ostrowski --- Institute of Marine Research, NorwayThe Mascarene Plateau lies in the south-west Indian Ocean between the islands of Mauritius and the Seychelles Bank, and is characterised by a series of shallow banks separated by deep (>1 000 m), narrow channels. The plateau acts as an... -
The impact of river flooding and high flow on the demersal fish assemblages of the freshwater-dominated Great Fish Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Nodo --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A-R Childs --- Department of Ichthyology and Fisheries Science, South Africa MDV Nakin --- Department of Biological and Environmental Sciences, South AfricaFreshwater inflow has a strong impact on the biological, chemical and physical characteristics of estuaries, which in turn affect the distribution and abundance of estuarine organisms. Increased climatic variability associated with climate change is predicated to modify precipitation patterns, which... -
Assessment of potential sources of protozoan contamination between two avian feeding guilds in a conservation area
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Adams A Chaskda --- AP Leventis Ornithological Research Institute, Department of Zoology, Nigeria Georgina S Mwansat --- Entomology and Parasitology Unit, Department of Zoology, Nigeria Danjuma Sani --- Entomology and Parasitology Unit, Department of Zoology, Nigeria Longtong Turshak --- Department of Science Laboratory Technology, NigeriaOccasional screening of food and water quality available to organisms in protected areas could be beneficial to their successful conservation. This is important for areas receiving regular human visitors and exhibiting activities that may be detrimental to ecosystem health. This... -
The bivalve Lembulus bicuspidatus may enhance denitrification in shelf sediment at the Angola–Benguela Frontal Zone
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Neumann --- University of Hamburg, Institute for Geology, Germany A Flohr --- Leibniz Center for Tropical Marine Ecology, GermanyWe collected living individuals of the bivalve Lembulus bicuspidatus, which shows an unusual preference for the oxygen-deficient habitat found at the Angola–Benguela Frontal Zone of the southeastern Atlantic. With a series of incubation experiments with 15N-labelled nitrate as a tracer... -
Use of diatom indices to categorise impacts on and recovery of a floodplain system in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Musa --- Department of Zoology, South Africa R Greenfield --- Department of Zoology, South AfricaThe trophic status of the Ramsar-accredited Nyl River floodplain, which is stressed by sewage treatment effluents, and its ability to restore normal conditions, were assessed in 2014–2015 using diatoms as biological indicators. The Trophic Diatom Index, Specific Pollution Sensitivity Index... -
Biometric variations and oxidative stress responses in juvenile Clarias gariepinus exposed to Termex®
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JU Nnadi --- Department of Zoology and Environmental Biology, Nigeria IN Dimelu --- Department of Home Economics and Hospitality Management Education, Nigeria SI Nwani --- Department of Agriculture Education, Nigeria JC Madu --- Department of Zoology and Environmental Biology, Nigeria CI Atama --- Department of Zoology and Environmental Biology, Nigeria GN Attamah --- Department of Zoology and Environmental Biology, Nigeria JI Okwor --- Department of Zoology and Environmental Biology, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, NigeriaThe current study investigated the effects of termite insecticide, Termex® (imidacloprid 35.50% SC), on biometric variations and oxidative stress biomarkers in Clarias gariepinus. Fish were exposed to 4.00 and 6.00 µg l–1 sublethal Termex® concentrations in 2017. The gill and... -
Acute toxicity effects of ibuprofen on behaviour and haematological parameters of African catfish Clarias gariepinus (Burchell, 1822)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ogueji --- Department of Fisheries and Aquaculture, Nigeria CD Nwani --- Department of Zoology and Environmental Biology, Nigeria SC Iheanacho --- Department of Fisheries and Aquaculture, Nigeria CE Mbah --- Department of Zoology, Zaria CO Okeke --- Department of Biology/Microbiology/Biotechnology, Nigeria A Yaji --- Department of Fisheries, NigeriaIndiscriminate discharge of pharmaceutical waste into the aquatic ecosystem may pose serious health challenges to aquatic biota. The effect of acute exposure to ibuprofen was evaluated using changes in behaviour and haematological parameters under static bio-assay method in Clarias gariepinus... -
A mass mortality of fishes caused by receding water levels in the vegetated littoral zone of the West Kleinemonde Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa PD Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaOn 15 November 2017 the mouth of the West Kleinemonde Estuary breached following heavy catchment rains and increased river flow. The water level in the estuary following mouth opening decreased by 1.65 m within 24 h, resulting in an almost... -
Evidence for diet partitioning among three coexisting native freshwater fishes in South Africa's Cape Fold Ecoregion
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JM Shelton --- Freshwater Research Centre (FRC), South Africa MS Bird --- Department of Zoology, South Africa SM Marr --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThe partitioning of limited resources commonly explains how different species can coexist within the same ecological community. In this 2010 study, the diets of three coexisting freshwater fishes (Cape galaxias Galaxias zebratus, n = 27; Cape kurper Sandelia capensis, n... -
Relationships of water temperature and aquatic macroinvertebrate community structure with non-native riparian plant densities in the southern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Rivers-Moore --- Centre for Water Resources Research, South Africa HF Dallas --- Freshwater Research Centre, South Africa, and Nelson Mandela Metropolitan University, South Africa FC de Moor --- Albany Museum and Department of Zoology and Entomology, South Africa J Barendse --- Sustainability Research Unit/South African National Parks, South AfricaNon-native vegetation in the riparian zone impacts on water temperatures, flow patterns, degree of shading, channel modification, and changes to natural sediment loads. Freshwater ecosystems in the Garden Route Initiative planning domain are of particular conservation value, because of the... -
Sources of fish in the ephemeral western iishana region of the Cuvelai–Etosha Basin in Angola and Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MHT Hipondoka --- Department of Geography, History and Environmental Studies, Namibia BCW van der Waal --- Department of Zoology, South Africa MH Ndeutapo --- Independent Researcher, Angola L Hango --- Ministry of Agriculture, Water and Forestry, Department of Water Affairs and Forestry, NamibiaThe triangle between the Kavango and Kunene rivers is drained by the Cuvelai, an ephemeral and deltaic drainage system covering more than 100 000 km2. In good rainfall years, the area becomes populated by fish communities dominated by five species... -
Preliminary evaluation of non-native rainbow trout (Oncorhynchus mykiss) impact on the Cederberg ghost frog (Heleophryne depressa) in South Africa’s Cape Fold Ecoregion
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Avidon --- Department of Conservation Ecology and Entomology, South Africa JM Shelton --- Department of Conservation Ecology and Entomology, South Africa SM Marr --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South Africa TA Bellingan --- Centre for Invasion Biology, South Africa KJ Esler --- Department of Conservation Ecology and Entomology, South Africa OLF Weyl --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South AfricaWe evaluated the impact of non-native rainbow trout Oncorhynchus mykiss on a population of endemic Cedarberg ghost frog Heleophryne depressa in the upper Krom River (Olifants-Doring River Catchment, Cape Fold Ecoregion). We compared H. depressa abundance (using kick-sampling and underwater... -
First report on OH-PAHs in South African Clarias gariepinus bile from an urban impacted system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Pheiffer --- Water Research Group, Unit for Environmental Science and Management, South Africa N Bortey-Sam --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan Y Ikenaka --- Water Research Group, Unit for Environmental Science and Management, South Africa SMM Nakayama --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan H Mizukawa --- Department of Environmental Veterinary Science, Graduate School of Veterinary Medicine, Japan M Ishizuka --- Laboratory of Toxicology, Department of Environmental Veterinary Science, Japan NJ Smit --- Water Research Group, Unit for Environmental Science and Management, South Africa R Pieters --- Water Research Group, Unit for Environmental Science and Management, South AfricaThe concentrations of selected hydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) were determined in the bile of the African sharptooth catfish Clarias gariepinus from impoundments in the urban impacted Klip River system in Soweto, South Africa. Fish were sampled from three impoundments... -
Possible influences of a macroalgal bloom in eelgrass beds on fish assemblages in the lower Knysna Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Pollard --- South African Environmental Observation Network, South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity, South Africa AN Hodgson --- Department of Zoology & Entomology, South AfricaThe occurrence of a macroalgal bloom at eelgrass (Zostera capensis) sampling sites in the summer of 2014/2015 provided an opportunity to use underwater video cameras to monitor the possible effects of environmental change on fish diversity and abundance in the... -
A new Dactylogyrus species (Dactylogyridae: Monogenea) from Enteromius mattozi, Cyprinidae, at Piet Gouws Dam, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: SN Mashego --- Biodiversity, School of Molecular and Life Science, South Africa KS Matlou --- Biodiversity, School of Molecular and Life Science, South AfricaEnteromius mattozi Guimaraes, 1884, a popular eating fish among local people, were examined for monogenean parasites as part of a larger study to ascertain the feasibility of establishing aquaculture production in Limpopo, South Africa. In this study a new monogenean... -
Flexural, water absorption and wear responses of green composites from bio-resources
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Isiaka Oluwole Oladele --- Department of Metallurgical and Materials Engineering, Nigeria Oluwaseun Olayinka Abegunde --- Department of Metallurgical and Materials Engineering, Nigeria Abdullahi Olawale Masud --- Department of Metallurgical and Materials Engineering, NigeriaThis research was carried out to produce corn husk fibre reinforced recycled waste paper-based composites using natural rubber as a binder. The paper pulp was obtained by soaking waste paper in water for 24 hours after which it was ground... -
Yield of hydroponically grown tomato (Solanum lycopersicon) as affected by different particle sizes of sawdust
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Maboloke A Maatjie --- Department of Agriculture and Animal Health, South Africa Martin M Maboko --- Agricultural Research Council–Vegetable and Ornamental Plants, South Africa David M Modise --- Department of Agriculture and Animal Health, South AfricaThe particle size of a growing medium is one of the most important aspects in growing crops hydroponically. A study was conducted to determine the effect of particle size of sawdust as a substrate on tomato yield, in a non-temperature-controlled... -
The spatial ecology of adult Labeobarbus marequensis and their response to flow and habitat variability in the Crocodile River, Kruger National Park
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MJ Burnett --- Centre for Aquatic Research, Zoology Department, South Africa GC O’Brien --- School of Biology and Environmental Sciences, South Africa V Wepener --- Water Research Group, Unit for Environmental Sciences and Management, South Africa D Pienaar --- Scientific Services Skukuza, Kruger National Park, South AfricaThe spatial movement of Labeobarbus marequensis was evaluated by attaching radio transmitters to 16 adult fish and tracking them from August 2009 to July 2012 in the Crocodile River, Kruger National Park, South Africa. Monthly monitoring surveys acquired 1 620... -
Physico-chemical water quality characteristics of upper Ebonyi River, Enugu State, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NO Nweze --- Department of Plant Science and Biotechnology, Nigeria EC Eze --- Department of Plant Science and Biotechnology, NigeriaThe physico-chemical characteristics of upper Ebonyi River, Nigeria were assessed at four locations, from September 2014 to December 2014, using standard methods, thereby providing information for documentation and the determination of pollution status in comparison with World Health Standards. Parameters,... -
Zambian Invertebrate Scoring System (ZISS): A macroinvertebrate-based biotic index for rapid bioassessment of southern tropical African river systems
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HF Dallas --- Freshwater Research Centre, Scarborough, South Africa S Lowe --- University of Glasgow, Scotland MP Kennedy --- Northern Rivers Institute, School of Geosciences, England K Saili --- Department of Geography and Environmental Studies, Zambia KJ Murphy --- University of Glasgow, ScotlandAn extensive survey of tropical rivers, conducted during 2009–2012 throughout Zambia, collected 151 samples of benthic macroinvertebrates, located on 95 rivers in six of the nine freshwater ecoregions. Associated data for physico-chemistry, human activities and ecosystem stressors were collected. Data... -
Physico-chemical and Water Quality Index analysis of the Okhuaihe River, Edo State, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NK Egun --- Greenspring Consulting, Nigeria CU Ogiesoba-Eguakun --- Department of Animal and Environmental Biology, NigeriaThe water quality of the Okhuaihe River, Edo State, Nigeria was investigated from February to June 2016 to determine its suitability for drinking and other domestic purposes. Water samples collected from three stations were tested for fifteen physico-chemical parameters using... -
Environmental influence on phytoplankton communities in the northern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Barlow --- , South Africa T Lamont --- , South Africa D Louw --- , Namibia M-J Gibberd --- , South Africa R Airs --- , United Kingdom A van der Plas --- , NamibiaAn investigation of surface phytoplankton communities was undertaken on the shelf of the northern Benguela upwelling ecosystem during austral autumn (May) and spring (September), along latitudinal transects at 20° S and 23° S, from 2 to 70 nautical miles offshore,... -
Performance of Drought Tolerant Maize Varieties under Water Harvesting Technologies in the Coastal Region of Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: M.B. Muli --- Kenya Agricultural and Livestock Research Organization, Kenya D. Kengo --- Kenya Agricultural and Livestock Research Organization, Kenya A. Mzingirwa --- Kenya Agricultural and Livestock Research Organization, Kenya R. Musila --- Kenya Agricultural and Livestock Research Organization, KenyaThe average annual rainfall in coastal Kenya is 450–700 mm per annum in most places while the total annual evapotranspiration is 1200–1800 mm. In arid and semi-arid lands (ASALs), farmers grow maize varieties for medium to high rainfall zones without considering the... -
The breeding ecology of Mallard Anas platyrhynchos at Lake Tonga, north-eastern Algeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Aicha Fouzari --- Laboratoire de Conservation des Zones Humides, Algeria Farrah Samraoui --- Laboratoire de Conservation des Zones Humides, Algeria Boudjéma Samraoui --- Laboratoire de Conservation des Zones Humides, AlgeriaThe breeding ecology of Mallard Anas platyrhynchos was investigated at Lake Tonga, north-eastern Algeria, which is at the southern edge of the species’ range in the Western Palearctic. Breeding was mainly carried out in stumps of alder carr (Alnus glutinosa)... -
The presence of artificial water points structures an arid-zone avian community over small spatial scales
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Salamatu Abdu --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Alan TK Lee --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Susan J Cunningham --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South AfricaWater plays a key role in avian thermoregulation, especially when environmental temperatures approach or exceed body temperature. Birds living in arid environments need to either be adapted to life with unreliable access to water, or engage in large-scale movements to... -
Climate change and adaptation-induced engineering design and innovations in water development projects in Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Berhanu F. Alemaw --- Department of Geology, Botswana Nako M. Sebusang --- Department of Civil Engineering, BotswanaIn this paper, a framework for best practice for incorporating climate change and adaption in Africa is presented from mainly the water resources design and management perspectives to chart systematically ways of incorporating climate change in engineering design of water... -
Sustaining African water resources under climate change: Emerging adaptation measures from UNFCCC national communications
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Shepherd Muchuru --- Institute for Corporate Citizenship, University of South Africa, South Africa Godwell Nhamo --- Institute for Corporate Citizenship, University of South Africa, South AfricaThe changing climate is expected to affect the demand for and availability of water resources. The African continent is known to be water scarce with highly temporal and spatially variable rainfall. This paper explores climate-induced challenges faced in the water... -
Impact of health, water and sanitation as key drivers of economic progress in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Obaka Abel Inabo --- Department of Economics, Nigeria Noman Arshed --- Department of Economics, PakistanThis study examined the role of quality of health, water and sanitation as key drivers of economic progress, with a focus on Nigeria from 1990 to 2015. The indicators considered were economic progress (GDP per capita), health (infant mortality rate),... -
Impact of shorebird predation on intertidal macroinvertebrates in a key North African Atlantic wintering site: an experimental approach
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Joulami --- Faculty of Sciences Ben M’sik, Morocco R El Hamoumi --- Faculty of Sciences Ben M’sik, Morocco Z Daief --- Faculty of Sciences Ain Chock, Morocco H Bazairi --- Faculty of Sciences, Morocco RJ Lopes --- Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO), InBio Laboratório Associado, PortugalShorebirds, as migratory aquatic birds and top predators in intertidal ecosystems, can be affected by global environmental changes and escalations in local impacts on coastal lagoons and estuarine trophic networks. Many shorebirds winter in North African Atlantic coastal sites, most... -
Peaceful waters: Community action in sustainable scarce resource management in a rural Zimbabwean setting
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Evans Shoko --- School of Social Sciences, South AfricaI explored community collation approaches to sustainable water management by a rural Zimbabwean community for social justice and equity with inclusivity. Informants were a convenience sample of 27 community dwellers; including villagers (n = 20), community leaders (n = 2),... -
Growth and biomass partitioning of nine provenances of Quillaja saponaria seedlings to water stress
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Carlos Magni --- Departamento de Silvicultura, Facultad de Ciencias Forestales y de la Conservación de la Naturaleza, Chile Sergio Espinoza --- Centro de Desarrollo para el Secano Interior, Facultad de Ciencias Agrarias y Forestales, Chile Paola Poch --- Departamento de Silvicultura, Facultad de Ciencias Forestales y de la Conservación de la Naturaleza, Chile Betsabé Abarca --- Departamento de Silvicultura, Facultad de Ciencias Forestales y de la Conservación de la Naturaleza, Chile Iván Grez --- Departamento de Silvicultura, Facultad de Ciencias Forestales y de la Conservación de la Naturaleza, Chile Eduardo Martínez --- Departamento de Silvicultura, Facultad de Ciencias Forestales y de la Conservación de la Naturaleza, Chile Marco Yáñez --- Núcleo Científico Multidisciplinario, Chile Rómulo Santelices --- Centro de Desarrollo para el Secano Interior, Facultad de Ciencias Agrarias y Forestales, Chile Antonio Cabrera --- Centro de Desarrollo para el Secano Interior, Facultad de Ciencias Agrarias y Forestales, ChileInformation on the morphological and physiological responses of seedlings to stressors, such as water stress, is required for successful early establishment of seedlings. We examined provenance variation in morphological and physiological traits of Quillaja saponaria Molina seeds from nine provenances... -
Morphological and molecular characterization of Glossidium pedatum Looss, 1899 and Orientocreadium batrachoides Tubangui, 1931 from sharptooth catfish, Clarias gariepinus (Burchell, 1822)
Item type: Journal Article • Journal: African Zoology • Authors: José Chissiua Dumbo --- Department of Zoology, South Africa Quinton Marco Dos Santos --- Department of Zoology, South Africa Annemariè Avenant-Oldewage --- Department of Zoology, South AfricaThe superfamily Plagiorchioidea has a considerable number of genera and species with great uncertainty of their phylogenetic position. The objectives of the current study were to specifically describe the morphology and determine for the first time the phylogenetic position of... -
Seed mix type but not planting method or seed priming affect grassland restoration outcomes: a greenhouse trial
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Stuart Demmer --- School of Life Sciences, South Africa Michelle J Tedder --- School of Life Sciences, South Africa Kevin P Kirkman --- School of Life Sciences, South AfricaCommercial seed mixes and various mechanical planting methods have been implemented to overcome barriers to successful restoration of degraded grasslands but their effectiveness in aiding the restoration process has been understudied. Harvested seed must be cleaned of chaff to allow... -
Iodine status of pregnant women and children age 6 to 12 years feeding from the same food basket in Mopani district, Limpopo province, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: E Mabasa --- School of Health Sciences, Department of Nutrition, South Africa NS Mabapa --- School of Health Sciences, Department of Nutrition, South Africa PL Jooste --- Iodine Global Network, Southern Africa XG Mbhenyane --- Division of Human Nutrition, Department of Interdisciplinary Health sciences, South AfricaObjectives: The aim of the study was to assess the iodine status of pregnant women and children age 6 to 12 years feeding from the same food basket in Mopani District. -
Reef fish and benthic community structures of the Santa Luzia Marine Reserve in the Cabo Verde islands, eastern central Atlantic Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Freitas --- Faculdade de Engenharia e Ciências do Mar, República de Cabo Verde TC Mendes --- Departamento de Ecologia, Brazil C Almeida --- Faculdade de Engenharia e Ciências do Mar, República de Cabo Verde T Melo --- Biosfera I – Associação para Defesa do Meio Ambiente, República de Cabo Verde RC Villaça --- Departamento de Biologia Marinha, Brazil R Noguchi --- Programa de Engenharia Ambiental, Brazil SR Floeter --- Laboratório de Biogeografia e Macroecologia Marinha, Departamento de Ecologia e Zoologia, Brazil CA Rangel --- Centro Nacional de Avaliação da Biodiversidade e de Pesquisa e Conservação do Cerrado (CBC), Brazil CEL Ferreira --- Departamento de Biologia Marinha, BrazilUnderstanding ecological structures and the dynamics of reef fish assemblages is a fundamental step in current conservation biology. Patterns of abundance and biomass of reef fish communities of the tropical Cabo Verde Archipelago (eastern central Atlantic Ocean) have not been... -
Dynamics of water exchange and salt flux in the Macuse Estuary, central Mozambique, southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LLAJ Miguel --- Post-Graduate Program in Geology (PPGl), Brazil JWA Castro --- Post-Graduate Program in Geology (PPGl), Brazil SFA Machava --- Department of Oceanography, MozambiqueStudies of water-particle flow dynamics in shallow estuarine systems show that tidal currents control water exchange, salt flux and residence time. We used the 3D Estuary, Lake and Coastal Ocean Model (ELCOM) to estimate the dynamics of tidal currents, salt... -
Contribution to the knowledge of the macroinvertebrate fauna of the streams of Kahuzi-Biega National Park, Democratic Republic of Congo
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MF Ngera --- Centre de Recherche en Sciences Naturelles Lwiro, Democratic Republic of Congo SU Pauls --- Senckenberg Research Institute and Natural History Museum, Germany RW Holzenthal --- Department of Entomology, USA M Bagalwa --- Centre de Recherche en Sciences Naturelles Lwiro, Democratic Republic of Congo MA Bisimwa --- Centre de Recherche en Sciences Naturelles Lwiro, Democratic Republic of Congo EM Mushayuma --- Centre de Recherche en Sciences Naturelles Lwiro, Democratic Republic of Congo DR Cammaerts --- Independent researcher, research associate of the CRSN-Lwiro, Democratic Republic of CongoThe Albertine Rift is one of Africa’s major biodiversity hotspots. However, the aquatic fauna of its western border in Democratic Republic of Congo (DRC) remains understudied and poorly characterised. Kahuzi-Biega National Park (KBNP) in DRC is a crucial link for... -
Taxonomic challenges associated with identification guides of benthic macroinvertebrates for biomonitoring freshwater bodies in East Africa: A review
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Ochieng --- Department of Biology, Uganda J Okot-Okumu --- Department of Environmental Management, Uganda R Odong --- Department of Zoology, Entomology and Fisheries Sciences, UgandaAlthough biomonitoring of freshwater bodies is important in East Africa as a result of increasing environmental threats, the identification guides of benthic macroinvertebrates used to generate data for developing metrics for this purpose are mainly not regionally specific. This casts... -
Sustainable indicators for adventure tourism destinations: A case of Waterval Boven
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ndivhuwo Tshipala --- Centre for Sustainable Tourism, Department of Tourism Management, South Africa Willem Johannes Coetzee --- Department of Tourism, New Zealand Marius Potgieter --- Department of Marketing, South AfricaIn South Africa and around the world, the development of sustainable tourism indicators has been advocated by many authors and has resulted in a number of indicators. Indicators are distinguished by factors such as social, environmental as well as economic... -
Designing a business model from process perspective
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Aygül Dönmez-Turan --- Faculty of Economic and Administrative Sciences, Departments of Business Administration, Turkey Mina Özevren --- Faculty of Business Administration, TurkeyThe business model is a relatively new concept in entrepreneurship and strategic management literature. Thus, the growing body of business model literature contains qualitative research, especially case studies. The key reason business models are explained via case studies is that... -
Tolerance to salinity and dehydration in the Sahara Desert blue-eyed turtle, Mauremys leprosa saharica (Testudines: Geoemydidae) from a brackish pond in the Lower Draa basin, southern Morocco
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Soumia Loulida --- , , Morocco Mohammed Znari --- , , Morocco Mohamed Naimi --- , , Morocco Safaa Bendami --- , , MoroccoThe marginal populations of the Sahara blue-eyed pond turtle, Mauremys leprosa saharica, in the southern-most species distribution range in the pre-Saharan areas of north-west Africa, are faced with extreme environmental conditions of arid climate and anthropogenic and climate change mediated... -
Phenotypical, physiological and biochemical traits of the vegetative growth of wild tepary bean (Phaseolus acutifolius) under restricted water conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Reynaldo Leal-Delgado --- Botánica, Colegio de Postgraduados, México Cecilia B Peña-Valdivia --- Botánica, Colegio de Postgraduados, México Rodolfo García-Nava --- Botánica, Colegio de Postgraduados, México Antonio García-Esteva --- Botánica, Colegio de Postgraduados, México Eleazar Martínez-Barajas --- Departamento de Bioquímica, Facultad de Química, México Daniel Padilla-Chacón --- CONACyT – Colegio de Postgraduados, MéxicoTepary bean (Phaseolus acutifolius A. Gray) is distributed in arid and semi-arid regions from Arizona to the northern areas of Mexico. The objective of this study was to quantify the effects of water deficit on vegetative growth in four accessions... -
Smooth fan lobster Ibacus novemdentatus in the southwestern Indian Ocean: an overlooked fisheries resource?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Groeneveld --- Oceanographic Research Institute (ORI), South Africa LD Zacarias --- Instituto Nacional de Investigação Pesqueira (IIP), Mozambique SP Singh --- Oceanographic Research Institute (ORI), South AfricaBottom-trawl data collected by the RV Dr Fridtjof Nansen off Mozambique (in 1990, 2007 and 2018) and off eastern South Africa (in 2018) were analysed to investigate the distribution, abundance and size composition of the smooth fan lobster Ibacus novemdentatus... -
Localised intermittent upwelling intensity has increased along South Africa’s south coast due to El Niño–Southern Oscillation phase state
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MI Duncan --- Department of Ichthyology and Fisheries Science, South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AE Bates --- Department of Ocean Sciences, Canada WS Goschen --- Institute for Coastal and Marine Research, Ocean Sciences Campus, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe El Niño–Southern Oscillation (ENSO) phase state is reported to drive interannual variability in sea temperatures along South Africa’s south coast through its influence on wind-induced upwelling processes. Whether ENSO drives the intensity of localised, abrupt, intermittent upwelling is less... -
Patterns of juvenile reef-fish recruitment in Kenya’s shallow fringing- lagoon reefs
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM Okemwa --- Kenya Marine and Fisheries Research Institute, Kenya B Kaunda-Arara --- Department of Fisheries and Aquatic Sciences, Kenya EN Kimani --- Kenya Marine and Fisheries Research Institute, KenyaStudies to understand local-scale patterns in the recruitment of juvenile coral-reef fishes within the western Indian Ocean (WIO) region are few, yet such knowledge is important in fisheries management. Underwater visual census surveys were conducted at five shallow fringing-lagoon reef... -
Morphological identification of fungi associated with Eichhornia crassipes (Mart.-Solms) Laubach in the Wouri River Basin, Douala, Cameroon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SN Kenfack Voukeng --- Department of Zoology and Entomology, South Africa C Coombes --- Department of Zoology and Entomology, South Africa P Weyl --- Department of Zoology and Entomology, Switzerland F Djeugoue --- Department of Quality, Security and Environment, Cameroon MP Hill --- Department of Zoology and Entomology, South AfricaIn many parts of the world, excess growth of Eichhornia crassipes (Pontederiaceae) poses a serious threat to aquatic environments. In Cameroon, where manual clearing is still undertaken, little is known about fungal diversity associated with the plant, or its potential... -
“There is life in this place”: “DIY formalisation,” buoyant life and citizenship in Marikana informal settlement, Potchefstroom, South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Hestia Victor --- Department of Social Anthropology, South AfricaTheir shack settlement labelled “too informal” to receive basic service provision, the residents of Marikana informal settlement, in Potchefstroom, North West province, South Africa, planned and executed what was locally referred to as “DIY formalisation” in order to politically appeal... -
The potential use of chironomids (Insecta: Diptera) as bioindicators in streams and rivers around Sebeta, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Mezgebu --- Department of Fisheries and Aquatic Sciences, Ethiopia A Lakew --- National Fisheries and Aquatic Life Research Centre, Ethiopia B Lemma --- Department of Zoological Sciences, Ethiopia G Beneberu --- Department of Biology, EthiopiaThe impact of human activities on streams and rivers of Ethiopia was assessed using the Dipteran family Chironomidae. Different stressors originating from industries and agricultural activities were assessed to see their effect on Chironomidae taxa. Chironomidae larvae were collected using... -
Eutrophication of Ethiopian water bodies: a serious threat to water quality, biodiversity and public health
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Fetahi --- Aquatic Ecology, EthiopiaFreshwater ecosystems provide several ecological and economic services. However, these ecosystems in Ethiopia are deteriorating, because of economic growth, unwise use and pollution (eutrophication). This paper reviews existing trends of eutrophication in Ethiopian water bodies, identifies principal sources of nutrient... -
Assessment of trace metals in water samples and tissues of African catfish (Clarias gariepinus) from the Akaki River Catchment and the Aba Samuel Reservoir, central Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AB Kassegne --- Centre for Environmental Science, Ethiopia T Berhanu --- Interim Coordinator, Central Research Laboratory, Ethiopia JO Okonkwo --- Department of Environmental, Water and Earth Sciences, South Africa S Leta --- Centre for Environmental Science, EthiopiaConcentrations of Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn were determined in water and muscle of Clarias gariepinus from the Akaki River Catchment and the Aba Samuel Reservoir in Ethiopia during 2016 and 2017. The analyses were performed... -
A tale of two habitats: preliminary comparison of fish abundance and diversity between saltmarsh- and mangrove-dominated creeks in the Nahoon Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Keur --- Department of Biodiversity and Conservation Biology, Faculty of Natural Science, South Africa N James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa A Rajkaran --- Department of Biodiversity and Conservation Biology, Faculty of Natural Science, South AfricaA preliminary assessment of abundance and richness of fishes utilising saltmarsh and mangrove habitats in the Nahoon Estuary, situated on the eastern coast of South Africa, was undertaken during July 2017. The structural composition and complexity of the two habitats... -
A comparison between the morphological and molecular approach to identify the benthic diatom community in the St Lucia Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Nunes --- Botany Department and Institute for Coastal and Marine Research, South Africa JB Adams --- Botany Department and Institute for Coastal and Marine Research, South Africa S Van Aswegen --- Department of Biochemistry and Microbiology, South Africa GF Matcher --- Department of Biochemistry and Microbiology, South AfricaThe use of diatoms as bioindicators to detect human-induced change is a globally accepted monitoring tool. DNA metabarcoding is an effective complementary tool to standard microscopic methods for species identification, providing reliable and timeous diatom assessments in a range of... -
Vulnerability of birds to contaminated water sources in the Karoo region of South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Alan TK Lee --- FitzPatrick Institute of African Ornithology, South Africa Carolynne Geary --- Purposefully Lost Conservation Centre, South Africa Dale R Wright --- BirdLife South Africa, South Africa W Richard J Dean --- FitzPatrick Institute of African Ornithology, South AfricaThe Karoo is a unique region in South Africa in terms of its ecological processes and endemic species. Large areas are needed to maintain viable populations of nomadic birds that follow erratic rainfall events and subsequent food and nesting resources,... -
Megaherbivore response to droughts under different management regimes: lessons from a large African savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Izak PJ Smit --- , South Africa Mike JS Peel --- , South Africa Sam M Ferreira --- , South Africa Cathy Greaver --- , South Africa Danie J Pienaar --- , South AfricaDroughts are predicted to increase in frequency and intensity for large parts of Africa. It is unclear how this may impact native grazers in protected areas, and how these outcomes may differ under contrasting management approaches. Reducing artificial water sources... -
Drought amnesia: lessons from protected areas in the eastern Lowveld of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Mike JS Peel --- , South Africa Izak P Smit --- , South AfricaProtected areas (PAs) adjacent to the Kruger National Park (KNP) are divided into fenced and unfenced properties. We discuss land-use development to provide context of how these savannas have evolved over the past century. Although the PAs have embraced the... -
Physico-chemical and microalgal gradients change rapidly in response to mouth closure in a predominantly open estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DA Lemley --- Botany Department and the Institute for Coastal and Marine Research, South Africa JB Adams --- Botany Department and the Institute for Coastal and Marine Research, South AfricaA third of South Africa’s freshwater flow no longer reaches the coast, yet few systems have shifted from being permanently open to temporarily closed. For the first time since 1969, the Gamtoos Estuary mouth closed in June 2018, because of... -
Nutrient fluxes from sediments pose management challenges for the Knysna Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LRD Human --- South African Environmental Observation Network, Elwandle Coastal Node, South Africa R Weitz --- Department of Botany, Institute for Coastal and Marine Research, South Africa BR Allanson --- Knysna Basin Project, Department of Zoology and Entomology, South Africa JB Adams --- Department of Botany, Institute for Coastal and Marine Research, South AfricaThis study investigated seasonal dynamics of benthic nutrient fluxes using in situ benthic chambers deployed over a 24–hour period at the sediment water interface for four distinct regions of the Knysna Estuary. The sediment in the Upper Estuary, Lagoon and... -
Nutrient enrichment as a threat to the ecological resilience and health of South African microtidal estuaries
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JB Adams --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa S Taljaard --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa L van Niekerk --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa DA Lemley --- DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaNutrient pollution in South African estuaries is described using a Driver-Pressure-State-Impact-Response framework. The root cause (‘driver’) of deteriorating water quality is rapid population growth that leads to increasing inputs from wastewater treatment works (WWTWs), stormwater run-off and agricultural return flow... -
Abiotic and biotic responses to the 2016/2017 restoration project at the St Lucia Estuary mouth, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Jones --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa NK Carrasco --- School of Life Science, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa C Fox --- Ezemvelo KwaZulu-Natal Wildlife, St Lucia Estuary, South AfricaThe St Lucia Estuary is the largest estuarine lake in Africa and has been heavily impacted by anthropogenic activities, which include a history of human-induced sediment loading and separation in the 1950s of the originally common St Lucia Estuary-uMfolozi River... -
Effects of prolonged mouth closure in a temporarily open/closed estuary: a summary of the responses of invertebrate communities in the uMdloti Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UM Scharler --- School of Life Sciences, South Africa K Lechman --- School of Life Sciences, South Africa T Radebe --- School of Life Sciences, South Africa HL Jerling --- Department of Zoology, South AfricaProlonged mouth closure in estuaries is often associated with hypersalinity, mainly as a result of reduced freshwater inflow. However, on the KwaZulu-Natal coast, South Africa, temporarily open/closed estuaries have a tendency towards hyposalinity during closed mouth conditions, primarily because of... -
Response of the barrier island coastal region of southwestern Nigeria to climate and non-climate forcing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: IB Danladi --- Department of Geological Engineering, Turkey M Gül --- Department of Geological Engineering, Turkey E Ateş --- Vocational School of Ayaş, TurkeyDespite threats emanating from the influence of climate and non-climate forcing on the barrier island coastal region of southwestern Nigeria, the extent of the coastal erosion is poorly understood. We report evidence of coastal erosion and sediment accumulation in the... -
Chondrichthyans as an umbrella species-complex for conserving South African biodiversity
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GJ Osgood --- Department of Biology, Canada ME McCord --- South African Shark Conservancy (SASC), South Africa JK Baum --- Department of Biology, CanadaConservation surrogates, such as umbrella and flagship species, could help focus South Africa’s limited resources for research and management and enhance the conservation gains from marine protected areas (MPAs). Sharks, rays and chimaeras (Chondrichthyes), which are charismatic and ecologically diverse,... -
Contrasting patterns in the abundance of fish communities targeted by fishers on two coral reefs in southern Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Sancelme --- Australian Institute of Marine Science, Indian Ocean Marine Research Centre, Australia J Goetze --- Global FinPrint Project, Australia S Jaquemet --- Université de La Réunion, UMR 9220 ENTROPIE [Tropical Marine Ecology Laboratory], Réunion MG Meekan --- Australian Institute of Marine Science, Indian Ocean Marine Research Centre, Australia A Flam --- Marine Megafauna Foundation, Marine Megafauna Research Center, Mozambique AM Watts --- Marine Megafauna Foundation, Marine Megafauna Research Center, Mozambique CW Speed --- Australian Institute of Marine Science, Indian Ocean Marine Research Centre, AustraliaCoastal populations of maritime countries in eastern Africa rely on fish as a primary source of protein, but baseline information on the abundance of fish communities on these coastlines is often lacking. We used baited remote underwater video stations to... -
Mapping subtidal estuarine habitats with a remotely operated underwater vehicle (ROV)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Wasserman --- Botany Department, DST/NRF Research Chair in Shallow Water Ecosystems, South Africa L Claassens --- Department of Zoology and Entomology, South Africa JB Adams --- Botany Department, DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaSubtidal habitats have not yet been accounted for in habitat maps of South African estuaries. In this study, a novel method for mapping subtidal estuarine habitats, using a remotely operated underwater vehicle (ROV) piloted from a boat, was developed and... -
Hydropedology in South Africa: Advances, applications and research opportunities
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Johan van Tol --- Department of Soil, Crop and Climate Sciences, South AfricaThe need to characterise and quantify hydrological processes in order to manage scarce water resources led to significant progress in the field of hydropedology in South Africa during the past decade. The adoption of hydropedological research by industry and government... -
Effect of treated greywater by black shale and laterite on Lactuca sativa L. germination rate
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Drissa Sangare --- Department of Agronomic, Forestry and Environmental Engineering, Côte d’Ivoire Lassina Sandotin Coulibaly --- Department of Agronomic, Forestry and Environmental Engineering, Côte d’Ivoire Siaka Sylla --- Department of Science and Environmental Management, Côte d’Ivoire Lacina Coulibaly --- Department of Agronomic, Forestry and Environmental Engineering, Côte d’IvoireGreywater reuse for agricultural irrigation may contribute to reduced use of chemical fertilizers, and is helping to conserve scarce freshwater source. However, treatment methods that reduce the harmful effects of untreated greywater are essential for sustainable agriculture. This study aims... -
Assessment of vulnerability to groundwater pollution in Department of Odienné (North-West Côte d’Ivoire)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Oi Mangoua Jules Mangoua --- Laboratory of Environmental Sciences and Technologies, Côte d’Ivoire Kouamé Auguste Kouassi --- Laboratory Geosciences and Environment, Côte d'Ivoire Williams Francis Kouassi --- Laboratory Geosciences and Environment, Côte d'Ivoire Gountôh Aristide Douagui --- Laboratory Geosciences and Environment, Côte d'Ivoire Issiaka Savane --- Laboratory Geosciences and Environment, Côte d'Ivoire Jean Biemi --- Laboratory of Sciences and Techniques of Water and Environment, Côte d'IvoireDrinking water supply to populations is increasingly oriented towards the exploitation of groundwater whose quality meets WHO standards. However, groundwater is subjected to a pollution phenomenon of anthropogenic origin due to agro-industrial and mining operations that alter water quality. The... -
Blackwater processing via vermifiltration: Worm-based toilet (wormlet) in the arid context of Burkina Faso
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mougabe Koslengar --- Laboratoire Eaux Hydro-systèmes et Agriculture (LEHSA), Burkina Faso Yacouba Konate --- Laboratoire Eaux Hydro-systèmes et Agriculture (LEHSA), Burkina Faso Harouna Karambiri --- Laboratoire Eaux Hydro-systèmes et Agriculture (LEHSA), Burkina FasoIn Burkina Faso, faecal sludge is mostly discharged into the environment untreated, with associated public health risks. Thus, sanitation technology that efficiently treats Blackwater (BW) in-situ is urgently required. This paper reports the design and testing of a proposed worm-based... -
Histopathology of the liver and gills of Labeo rosae (rednose Labeo) from Loskop Dam in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Jeffrey Lebepe --- , South Africa Johan Steyl --- , South Africa Wilmien J Luus-Powell --- , South AfricaThe Loskop Dam is the most polluted impoundment in the Olifants River, because it receives pollutants from the entire mine-dominated upper catchment. However, histopathology of fish inhabiting this polluted dam is scantly explored. The current study aimed to investigate the... -
Promoting rainwater harvesting for improving water security: Analysis of drivers and barriers in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mavis Akuffobea-Essilfie --- , Ghana Portia Adade Williams --- , Ghana Roland Asare --- , Ghana Sigrid Damman --- , Norway George Owusu Essegbey --- , GhanaThe study explored strategies and means of achieving wider acceptability and adoption of roof rainwater harvesting (RWH) systems in Ghana to improve water security and availability. The paper employed a qualitative approach in analyzing views expressed by a wide range... -
Monitoring the effects of spatial protection on the reef fish communities of the Pondoland Marine Protected Area, Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa JQ Maggs --- , New Zealand SN Porter --- , South Africa WN Dalton --- , South AfricaMonitoring marine protected areas (MPAs) is critical for evaluating their effectiveness and for improving management. In this study, a single-camera baited remote underwater video system (mono-BRUVS) was deployed quarterly at four sites (10–30-m depths) to quantify the reef fish communities... -
Patch-scale selection patterns of grazing herbivores in the central basalt plains of Kruger National Park
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Cyanne Young --- , South Africa Hervé Fritz --- , South Africa Erica AH Smithwick --- , United States of America Jan A Venter --- , South AfricaLarge herbivores form an essential component in the ecosystem, because of the impact that they have on their surrounding habitat. In this study, we aimed to evaluate some of the mechanisms behind how herbivores select forage at a patch scale... -
Assessment of physico-chemical parameters of freshwater in the Sidi Abderrahmane reservoir, Safi, Morocco
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Belokda --- , Morocco Z Damsiri --- , Morocco L Natij --- , Morocco K Khalil --- , Morocco M Loudiki --- , Morocco A Dahbi --- , Morocco H Achtak --- , Morocco J Richir --- , Belgium B Sabour --- , Morocco K Elkalay --- , MoroccoThe purpose of the study was to assess the water quality in the Sidi Abderrahmane freshwater reservoir (Safi, Morocco). The monitoring data used in the study included physical, chemical, and biological characteristics. The spatial and temporal characteristics of these parameters... -
Using action cameras to estimate the abundance and habitat use of threatened fish in clear headwater streams
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Hannweg --- , South Africa SM Marr --- , South Africa LE Bloy --- , South Africa OLF Weyl --- , South AfricaSnorkel and electrofishing surveys are the traditional baseline methods for fish surveys in clear headwater streams. However, action cameras provide a non-harmful alternative to monitor freshwater fish populations to develop informed conservation management initiatives. In this paper, estimates from photographs... -
Assessment of heavy metals pollution in surface and groundwater systems in Oued Righ region (Algeria) using pollution indices and multivariate statistical techniques
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ML Benhaddya --- , Algeria Y Halis --- , Algeria B Hamdi-Aïssa --- , AlgeriaSurface and groundwater samples of the Oued Righ region (south-eastern Algeria) were analysed for Cd, Cr, Cu, Mn, Ni, Pb and Zn by atomic absorption spectrophotometric method. An integrated approach of pollution evaluation indices and multivariate statistical methods (one-way ANOVA,... -
Habitat utilisation of Pseudobarbus afer and Sandelia capensis in headwaters of the Swartkops River, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B Hannweg --- , South Africa SM Marr --- , South Africa LE Bloy --- , South Africa OLF Weyl --- , South AfricaHabitat degradation is one of the greatest threats to endemic freshwater fish in the Cape Fold Ecoregion. One habitat restoration strategy is the replication of critical habitat using artificial materials. In this paper, we evaluate the habitat occupancy of two... -
Biomarker responses in African sharptooth catfish, Clarias gariepinus (Burchell, 1822), as indicators of potential metal and organic pollution along the Vaal River system, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LJ Connell --- , South Africa GR Jansen van Rensburg --- , South Africa A Avenant-Oldewage --- , South Africa R Greenfield --- , South AfricaThe Vaal River is of considerable economic and environmental importance. It flows through five provinces within South Africa and it is subject to numerous recreational and industrial activities, which often prove detrimental to the health of the system. To determine... -
Effect of land terracing on soil physical properties across slope positions and profile depths in medium and high altitude regions of Rwanda
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Aloys Fashaho --- , Rwanda George M Ndegwa --- , Rwanda Joyce J Lelei --- , Kenya Amos O Musandu --- , Kenya Samuel M Mwonga --- , KenyaAlthough land terracing is promoted as a management practice for effective soil conservation in hilly areas, construction of terraces causes changes in soil properties. This study evaluated the effect of land terracing on some soil physical properties across slope positions... -
Sustainable shellfish aquaculture in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Santa Marta --- , United Kingdom JG Ferreira --- , United Kingdom GC Pitcher --- , South Africa J Lencart e Silva --- , United KingdomThe carrying capacity for bivalve shellfish culture in Saldanha Bay, South Africa, was analysed through the application of the well-tested EcoWin ecological model, in order to simulate key ecosystem variables. The model was set up using: (i) oceanographic and water-quality... -
Beta diversity of pelagic assemblages at fish aggregating devices in the open ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Forget --- , France L Dagorn --- , France B Mérigot --- , France JC Gaertner --- , French Polynesia J Robinson --- , Seychelles PD Cowley --- , South Africa MS Adam --- , Maldives Y Rilwan --- , Maldives M Koonjul --- , Mauritius V Mangar --- , Mauritius M Taquet --- , French Polynesia F Ménard --- , FranceOwing to difficulties in accessing the vast open ocean, the beta (β) diversity of pelagic fish assemblages remains poorly studied. We investigated the relationship between assemblage similarity and geographical distance between anchored fish aggregating devices (FADs), sampled by standardised underwater... -
Wave setup at Tristan da Cunha
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PL Woodworth --- , United KingdomWave setup was investigated using data from tide gauges in a small harbour at the island of Tristan da Cunha in the South Atlantic Ocean. Frequent examples of wave setup were found during the period 1986–1992, but were much less... -
Spatial variation of nutrients and primary productivity in the Rufiji Delta mangroves, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Minu --- , Tanzania J Routh --- , Sweden JF Machiwa --- , Tanzania S Pamba --- , TanzaniaDeterminations of spatial and temporal variations in organic matter and nutrient dynamics in water and sediments are crucial for understanding changes in aquatic bodies. In this study, we (i) determine the spatial dynamics of dissolved inorganic nutrients, during the transition... -
Diet of the marsh mongoose around a non-permanent reservoir: response of a generalist opportunist forager to the absence of crabs
Item type: Journal Article • Journal: African Zoology • Authors: Emmanuel Do Linh San --- , South Africa Aviwe Nqinana --- , South Africa Zimkitha JK Madikiza --- , South Africa Michael J Somers --- , South AfricaThe diet of the marsh or water mongoose Atilax paludinosus has been well studied in coastal and inland riverine habitats, where crabs often constitute the main prey in terms of frequency of occurrence. We investigated the feeding ecology of a... -
A review of some aspects of the ecology, population trends, threats and conservation strategies for the common hippopotamus, Hippopotamus amphibius L, in Zimbabwe
Item type: Journal Article • Journal: African Zoology • Authors: Beaven Utete --- , ZimbabweThis review explores some ecological aspects of the common hippopotamus (hippo), Hippopotamus amphibius L, threats to its population and contextual peculiarities affecting its conservation in selected water systems in Zimbabwe. Scoping surveys of literature and thematisation of common issues related... -
Cyanobacterial abundance and microcystins in water, seston and fish tissues in Lake Hora-Arsedi (Ethiopia)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TW Zewde --- , Ethiopia D Kifle --- , Ethiopia JA Johansen --- , Norway TB Demissie --- , Ethiopia JH Hansen --- , Norway Z Tadesse --- , EthiopiaThe phytoplanktonic composition with a focus on cyanobacteria, intra- and extracellular microcystins (MCs) concentrations and MCs concentrations in fish tissues were investigated in Lake Hora-Arsedi (Ethiopia). The phytoplankton community comprised of 40 species in the first phase of the study... -
Trends in chemical pollution and ecological status of Lake Ziway, Ethiopia: a review focussing on nutrients, metals and pesticides
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LB Merga --- , The Netherlands AA Mengistie --- , Ethiopia JH Faber --- , The Netherlands PJ Van den Brink --- , The NetherlandsAquatic ecosystems contribute to human well-being by delivering ecosystem services, but their protection has been given low priority in Africa. Lake Ziway in the Ethiopian Rift Valley basin provides services including irrigation, drinking water and fish food in the region... -
Plankton Index of Biotic Integrity (P-IBI) for assessing ecosystem health within the Ouémé River basin, Republic of Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AM Houssou --- , Republic of Bénin DC Adjahouinou --- , Republic of Bénin CA Bonou --- , Republic of Bénin E Montchowui --- , Republic of BéninThis study aims at assessing the impact of organic pollution on plankton communities of the Ouémé River using a Plankton Index of Biotic Integrity (P-IBI) as a tool for ecological heath assessment. Plankton and other environmental data were collected monthly... -
Host selection and notes on the distribution of Chonopeltis australis Boxshall, 1976 in southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LAM Neethling --- , South Africa A Avenant-Oldewage --- , South AfricaThe parasite Chonopeltis australis Boxshall, 1976 has been recorded from tributaries of the Orange-Vaal River System. It is host-specific, preferring the cyprinids Labeo capensis (Smith, 1841) and Labeo umbratus (Smith, 1841). Sampling was conducted between spring 2016 and autumn 2019... -
River water quality modelling and simulation based on Markov Chain Monte Carlo computation and Bayesian inference model
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mrunmayee Manjari Sahoo --- , India Kanhu Charan Patra --- , Rourkela, IndiaHierarchical Bayesian methods are experiencing increased use for probabilistic ecological modelling. Influence of water quality indicators in the river water are studied. Bayesian inference through Markov Chain Monte Carlo (MCMC) algorithm is used as the basic model to assess the... -
Inter-annual growth response of three Miombo tree species to climatic effects
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Francis Munalula --- , South Africa Thomas Seifert --- , South Africa Martina Meincken --- , South AfricaMiombo woodlands cover a large part of Southern Africa and contribute an important wood source for the local wood industry. The already observed and further predicted changes in climatic patterns can be expected to affect the wood properties of Miombo... -
Drip irrigation systems controlled by soil moisture sensors and a soil water balance model for cassava grown in soils of two different textures
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Xintai Xie --- , Thailand Thitiporn Machikowa --- , Thailand Sodchol Wonprasaid --- , ThailandCassava (Manihot esculenta Crantz) yield could be improved by drip irrigation if irrigation scheduling is correctly organized. Soil moisture content is an important factor for controlling irrigation. It can be directly monitored by soil moisture sensors or predicted by soil... -
Composition, structure and diversity of fish assemblages across seascape types at Príncipe, an understudied tropical island in the Gulf of Guinea (eastern Atlantic Ocean)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Otero-Ferrer --- , Canary Islands F Tuya --- , Canary Islands NE Bosch Guerra --- , Australia A Herrero-Barrencua --- , Canary Islands AD Abreu --- , R Haroun --- , Canary IslandsCoastal seascapes are often composed of a mosaic of interconnected habitats. Transitions between adjacent habitats are of special relevance to the ecology of many reef-associated organisms. In this study, we tested (i) whether the degree of similarity in the composition... -
Spatial and temporal diversity of non-native biofouling species associated with marinas in two Angolan bays
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LB Pestana --- , Brazil GM Dias --- , Brazil AC Marques --- , BrazilArtificial structures in coastal areas provide substrates which facilitate the spread of non-native species. Published records of introduced benthic species in the coastal waters of Angola are scarce, and so far these have numbered 29 non-native species and seven cryptogenic... -
Mechanisms of drought response in Populus
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lita Yi --- , China Bin Li --- , China Helena Korpelainen --- , Finland Fei Yu --- , China Lihong Wu --- , China Lingyun Tong --- , China Meihua Liu --- , ChinaDrought affects plant growth and has become a serious problem worldwide. Populus species have different drought tolerance and sensitivity abilities. In order to evaluate the mechanism of drought stress tolerance in different cultivated Populus species distributed in China, the response... -
Temporal effects of biocontrol processes on nutrient dynamics in a shallow lake: Case study of Lake Xini, Okavango Delta in Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CN Kurugundla --- , Botswana JC Buru --- , AustraliaLittle is known about the effects of weeds on nutrient concentration changes in aquatic environments. We examined alterations to nutrient dynamics from the biocontrol process of Salvinia molesta by the weevil Cyrtobagous salviniae in the Lake Xini of Okavango, Botswana... -
Interannual variation in metal concentrations in surface waters of the Marico River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Pienaar --- , South Africa V Wepener --- , South Africa CT Wolmarans --- , South AfricaThis study was conducted to establish the interannual variation in the concentration of metals regarded as toxic to aquatic fauna in the Marico River of South Africa. Five surveys were conducted between 2013 and 2015 at six sites in the... -
Links between introduced fish and zooplanktonic and zoobenthic food sources in the food webs of two reservoirs of a semi-arid zone in Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Djezzar --- , Algeria JM Mortillaro --- , Madagascar SE Doumandji --- , Algeria T Meziane --- , FranceFew studies have focused on the trophic functioning of the reservoirs in Algeria. The study of the gut contents of fish species, as well as the analysis of the stable isotopes of 13C and 15N in the environment, were carried... -
An assessment of the ecological condition of a wetland on the Lions River floodplain based on soil and vegetation parameters, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Ndlovu --- , South Africa DC Kotze --- , South Africa GPW Jewitt --- , South Africa CD Morris --- , South AfricaWetlands are increasingly exposed to human activities, resulting in degradation. As the wetland degrades, it loses functionality. In South Africa, wetlands can play an important water-regulating role. This study aims to establish the ecological condition of a historically utilised wetland... -
Mass developments of Euglena sanguinea Ehrenberg in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Janse van Vuuren --- , South Africa A Levanets --- , South AfricaBlooms of Euglena sanguinea Ehrenberg were observed at two different locations in South Africa, Mpumalanga province during 2016 and Limpopo province during 2020. Besides being responsible for a blood-red discolouration of the water, the species is also toxic, causing fish... -
Nest characteristics and morphometry of Black Crowned Cranes Balearica pavonina ceciliae in Lake Tana area wetlands
Item type: Journal Article • Journal: African Zoology • Authors: Shimelis Aynalem Zelelew --- , Ethiopia George Archibald --- , United StatesBirds select breeding habitats based on biotic and abiotic environmental factors, resulting in a non-random spatial distribution of nests. This study investigated the onset of nesting, nest location, the relationship between nest height and water depth, nest materials, and the... -
Demersal fish communities in KwaZulu-Natal, South Africa, indicate partial congruence with proposed conservation biozones
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WN Dalton --- , South Africa SN Porter --- , South Africa T-C Livingstone --- , South Africa BQ Mann --- , South AfricaThe KwaZulu-Natal shelf, on the east coast of South Africa, is inhabited by diverse communities of demersal fishes; however, previous studies deeper than 30 m have largely investigated these with extractive techniques. Using baited remote underwater videos (BRUVs), this study... -
Reliability and quality of artificial nectar feeders for birds in the Cape Floristic Region
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Anina Coetzee --- , South Africa Phoebe Barnard --- , South Africa Anton Pauw --- , South AfricaSupplementary feeding of birds may have considerable ecological and evolutionary effects on bird communities. However, there is a lack of basic information on the prevalence, frequency and quality of supplementary feeders, especially in African urban areas. Here we describe the... -
Quality assessment of surface water using the Nile Chemical Pollution Index (NCPI) and microbiological pollution of the Rosetta Branch (Nile River, Egypt)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Amal A Othman --- , Egypt Afify DG Al-Afify --- , Egypt Amaal M Abdel-Satar --- , Egypt Mohamed F Ramadan --- , EgyptThe Rosetta Branch (Nile River, Egypt) is one of the main sources of freshwater for drinking, agricultural, and industrial activities in the Nile Delta. However, this water supply is compromised because it receives heavy loads of domestic, agricultural and industrial... -
Development of a Water Quality Assessment Index for the Chania River, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GK Robert --- , Kenya CN Onyari --- , Kenya JG Mbaka --- , KenyaHuman-related activities are known to have deleterious effects on the water quality of aquatic ecosystems, but there is limited information on the impact of these on rivers in tropical regions, such as the Chania River in Kenya. The Chania River... -
Zooplankton composition of temporary pools within the lower Nata River channel, Botswana, during dry season
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DT West --- , South Africa LL van As --- , South AfricaThe Nata River is a seasonal system situated in the semi-arid north-eastern Botswana, where rainfall is unpredictable and drought is common. The annual flow of approximately 279 million cubic meters is regionally significant and it forms an important resource for... -
Identifying multiple geographically restricted phylogeographic lineages of Moggel (Cyprinidae: Labeo umbratus) in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Ramoejane --- , South Africa OLF Weyl --- , South Africa ER Swartz --- , South Africa G Gouws --- , South AfricaLabeo umbratus (Smith, 1841) is a widespread species with populations distributed across isolated southern African river systems. Given that cryptic lineages have been detected in freshwater fishes with a similar distribution, a phylogeographic study of L. umbratus was conducted, considering... -
Effects of fragmented mangroves on macrozoobenthos: a case study of mangrove clearance for powerline right-of-way at Oproama Creek, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Zabbey --- , Nigeria IG Ekpenyong --- , Nigeria GN Nwipie --- , Nigeria IC Davies --- , Nigeria K Sam --- , NigeriaMangroves are vulnerable to varying magnitudes of degrading impact by human activities. Despite the many benefits of mangrove ecosystems, mangroves in the Niger Delta region are often cleared for electric powerline and oil pipeline rights-of-way, recreation, road construction, housing and... -
Species composition and distribution of mayflies (Ephemeroptera) in relation to land use systems along the Thika River, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C Maina --- , Kenya BM Mwangi --- , Kenya JJ Jumbe --- , KenyaMayflies (order Ephemeroptera) are widely distributed and commonly used in biological assessment of water quality because of their sensitivity. Their application as bio-indicators in tropical streams and rivers, however, is hampered by lack of adequate information about their status in... -
Can bait improve the efficiency of underwater video monitoring of fish in headwater streams? A case study from the Rondegat River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SZ Bajaba --- , South Africa S Hugo --- , South Africa AJ van Wyk --- , South Africa SM Marr --- , South Africa NG Vine --- , South Africa OLF Weyl --- , South AfricaThe use of action cameras for underwater video sampling provides a non-harmful alternative for monitoring endangered and threatened fish populations in clear headwater streams. Here, we examine the use of baited remote underwater video systems (BRUVS) for the monitoring of... -
Moringa oleifira noise: Science or quackery and the way forward
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Margaret Huruma Mollel --- , Republic of South Africa Munyaradzi Mujuru --- , Republic of South Africa Vuyo Mjimba --- , Republic of South Africa Nicolas Darangwa --- , Republic of South Africa Richard Nyanzi --- , Republic of South AfricaThe moringa tree is a rising star in South Africa where it is increasingly playing a variety of social and economic roles, especially among the rural poor. Also known as the horseradish tree, moringa has been referred to as the... -
Are there long-term temporal trends of size composition and the length– weight relationship? Results for chokka squid Loligo reynaudii during the peak spawning season off the south coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MR Lipiński --- , South Africa MA Mmethi --- , South Africa D Yemane --- , South Africa J Githaiga-Mwicigi --- , South Africa WHH Sauer --- , South AfricaTemporal trends in the size composition (length frequency) and length–weight (L–W) relationship of chokka squid Loligo reynaudii on the south coast of South Africa were assessed over periods spanning 22 years: length frequencies from 1996 to 2017 (with 15 years... -
Response of malt barley grain quality characteristics to increasing irrigation water salinity
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: VN Mathinya --- , South Africa JH Barnard --- , South Africa ZA Bello --- , South Africa E van der Watt --- , South AfricaPremiums are offered for high quality grain, but producers of malting barley are often confronted with marginal soils and water scarcity. Irrigation water quality is often low, primarily due to high salt loads. This study determined the effect of irrigation... -
‘Drink clean, safe water and/or other fluids through-out the day even if you do not feel thirsty’: a food-based dietary guideline for the elderly in South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Upasana Mukherjee --- , USA Carin Napier --- , South Africa Wilna Oldewage-Theron --- , USAThis review summarises information from available literature to support the dietary guideline ‘Drink Clean, Safe Water and/or Other Fluids Through-Out the Day Even if You Do Not Feel Thirsty’ set for the elderly of South Africa (SA). Water is essential... -
Energy and water utilization in smallholder dairy farming: A milk bulking group case study in Malawi
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Thomas Nyanda Reuben --- , Malawi Grivin Chipula --- , Malawi Thawani Mpatama Sanjika --- , Malawi Darwin Dodoma Singa --- , MalawiMalawi’s dairy farming is dominated by smallholder farmers living in rural areas. The farmers practise hand-milking and have an unreliable supply of clean water. Consequently, low milk yields of generally low quality are realized. Machines can safely be used for... -
Investigating the effects of hypersalinity on the cardiac performance of the invasive gastropod Melanoides tuberculata (Müller, 1774)
Item type: Journal Article • Journal: African Zoology • Authors: TJ de Haas --- , South Africa LJ Connell --- , South Africa R Greenfield --- , South AfricaAnthropogenic activities have propelled the exploitation of natural environments, which along with climate change have resulted in salinity intrusion to freshwater ecosystems worldwide. To determine the extent the hypersalinity stressor has on freshwater ecosystems, physiological cardiac responses in the freshwater... -
Green technology for bioremediation of the eutrophication phenomenon in aquatic ecosystems: a review
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Mostafa El-Sheekh --- , Egypt Mohamed M Abdel-Daim --- , Saudi Arabia Mohamed Okba --- , Egypt Samiha Gharib --- , Egypt Asgad Soliman --- , Egypt Hala El-Kassas --- , EgyptEutrophication is a serious phenomenon that leads to vigorous algal blooms that alters the structure of ecosystems. It is caused by non-point sources of nutrients; as nitrogen and phosphorus, and point sources as wastewater effluent. Distinctive algae groups are responsible... -
Quality assessment of groundwater in an agricultural belt in eastern Nigeria using a Water Quality Index
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ogechi L Alum --- , Nigeria Chukwuma OB Okoye --- , Nigeria Hillary O Abugu --- , NigeriaThe physico-chemical and microbial analyses of fifteen hand-dug wells (HDWs) and six boreholes (BHs) in the Ezeagu and Uzo-uwani Local Governments Areas (LGAs) of Enugu State in south-eastern Nigeria were conducted to evaluate their water quality for potability. Samples were... -
Assessment of river health using benthic macroinvertebrates in the Dwars River, Olifants Water Management Area, Limpopo province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TV Mmako --- , South Africa A Addo-Bediako --- , South Africa WJ Luus-Powell --- , South Africa M Kekana --- , South AfricaThe study assessed the impact of water and sediment quality on benthic macroinvertebrate assemblages in the Dwars River, a tributary of the Olifants River, Limpopo province, South Africa. Physico-chemical variables, heavy metals and macroinvertebrates were collected using standard methods. A... -
Challenges and opportunities for water conservation in irrigated agriculture in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Willem de Clercq --- , South Africa Marlene de Witt --- , South Africa Giel Laker --- , South AfricaThis review provides a brief overview of problems in irrigated agriculture that have become more evident as a result of climate change. In most irrigated regions in South Africa, the demand for water is exceeding the supply, as surface water... -
Response of tomato cultivars to irrigation management strategies employed by emerging farmers in the Greater Giyani Municipality
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tebogo J Lebea --- , South Africa Nebo Jovanovic --- , South Africa Mapotso Kena --- , South Africa Kwabena K Ayisi --- , South Africa Wisani G Mushadu --- , South AfricaIntensification of low-tech agricultural production is required in the Greater Giyani Municipality (Limpopo province, South Africa) to respond to changing climatic conditions, water scarcity and increased food demand of the local market. Two years of field experiments were conducted on... -
Water-related technology research landscape in India: Current status and perspectives
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Deep Jyoti Francis --- , Anup Kumar Das --- ,While seventy-one per cent of the earth’s surface is covered with water, equitable access to safe and drinking water remains a challenge across countries. Especially developing countries, like India, have been identified as water-stressed. In India, various institutions are participating... -
Distribution and community structure of at-risk and Data Deficient elasmobranchs in Zavora Bay, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B O’Connor --- , The Netherlands N Cullain --- , United StatesPersistent threats from fishing pressure and increasing habitat degradation, as well as slow recovery rates resulting from K-selected life histories, are putting increasing numbers of elasmobranch species (sharks, rays and skates) at risk of extinction worldwide. Global declines in elasmobranch... -
Value chain and marketing margins analysis of watermelon: An insight from Northern Uganda
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Jemima Alla Houessou --- , Uganda Basil Mugonola --- , Uganda Walter Odongo --- , UgandaWatermelon is one of the emerging market oriented agricultural products with potential of improving rural livelihoods and alleviating poverty. Consequently, watermelon is attracting attention and gaining a bigger market share as a cash crop. This paper analyzed the value chain... -
Soil erosion risk analysis and mapping for conservation planning at Mihtsab-Azmati micro-dam watershed, Northern Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Selama Gebreslassie Yebyo --- , EthiopiaThis study was conducted to quantify, analyze and map soil erosion risk areas using remotely sensed data and GIS-based Revised Universal Soil Loss Equation (RUSLE) model at Mihtsab-Azmati Irrigation Dam Watershed, Northern Ethiopia. Based on the result, the watershed has... -
Development of a multimetric index for assessing the ecological integrity of some selected rivers and streams in the north-eastern part of Lake Tana sub-basin, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Amelework Zewudu --- , Ethiopia Getachew Beneberu --- , Ethiopia Minwyelet Minigst --- , Ethiopia Amare Mezgebu --- , EthiopiaA multimetric index was developed using benthic macroinvertebrates to assess the ecological health of selected rivers and streams in the north-eastern part of Lake Tana subbasin, Ethiopia. One-time extensive sampling was carried out during the post-rainy season (November–December) of 2016... -
Assessing fish community response to water quality and habitat stressors in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Wesley Evans --- , South Africa Colleen T Downs --- , South Africa Matthew J Burnett --- , South Africa Gordon C O’Brien --- , South AfricaThe degradation of freshwater ecosystems can be attributed to stressors associated with the increased demand for water and other aquatic resources. Freshwater ecosystems face such challenges in supporting agriculture, industry, and high-density urban areas in KwaZulu-Natal (KZN) province, South Africa... -
Structural assemblages of plant species in the Owabi Ramsar Wetland in the Ashanti Region of Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Collins A Nsor --- , Ghana Rockson Acolatse --- , Ghana John N Mensah --- , Ghana Samuel K Oppong --- , Ghana Daniel Dompreh --- , Ghana Louis Addai-Wireko --- , GhanaAnthropogenic activities as predictors of species assemblages in the Owabi Ramsar Wetland were investigated between May and September 2019. Data were collected in 154 plots at five different sites. The prevalence index method was used to categorise the species into... -
Using the Kariba Invitation Tiger Fishing Tournament for monitoring an invasive crayfish Cherax quadricarinatus in Lake Kariba, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LT Marufu --- , Zimbabwe C Phiri --- , Zimbabwe M Barson --- , Botswana T Nhiwatiwa --- , ZimbabweThe stomach contents of tigerfish Hydrocynus vittatus, caught in an angling competition on Lake Kariba, were examined to determine the extent to which they feed on the invasive crayfish Cherax quadricarinatus. The stomach contents of 281 tigerfish caught during three... -
Comparison of calcium concentration in scales and vertebral column of a cyprinid from calcium-limited environments in the Lake Victoria Basin, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WA Nesbitt --- , Canada SB Clarke --- , Canada LJ Chapman --- , CanadaDespite dramatic differences in calcium concentrations within aquatic systems, very few studies have explored the relationships between ambient calcium concentration and the calcium concentration of resident fish under natural conditions. This study compares calcium concentration in the water to that... -
Assessments of range-wide distribution of six African storks and their relationships with protected areas
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Jonah Gula --- , USA M Clay Green --- , USA Sarah Fritts --- , USA W Richard J Dean --- , South Africa KS Gopi Sundar --- , IndiaSpecies range maps provided by the IUCN and BirdLife International are recognised to sometimes mischaracterise distribution and have resulted in inaccurate status assessments. In this study we assessed distribution trends and relationships with protected area extent for six African storks,... -
Spatial distribution of zooplankton in relation to some selected physicochemical water quality parameters of Lake Hawassa, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Getacher Beyene --- , Ethiopia Demeke Kifle --- , Ethiopia Tadesse Fetahi --- , EthiopiaWhile scientific information on spatial variation of freshwater zooplankton is relevant to limnological studies, little information is available from the Ethiopian Rift Valley lake: Lake Hawassa. This study aimed at understanding the spatial distribution of the dominant zooplankton taxa in... -
Evidence for overfishing of tigerfish Hydrocynus vittatus (Castelnau 1861) in the Kavango River, Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FJ Jacobs --- , Namibia TF Naesje --- , Norway EM Ulvan --- , Norway CJ Hay --- , Namibia FH Khaebeb --- , Namibia OLF Weyl --- , South AfricaThe fishery for the African tigerfish Hydrocynus vittatus in northern Namibia makes a substantial contribution to surrounding food security and stimulates the local economy through subsistence and recreational fishing. However, local fishers suggest that catch rates of H. vittatus have... -
Ecological quality of the Alibori River, northern Benin, using macroinvertebrate indicators
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TM Agblonon Houelome --- , Benin TP Agbohessi --- , Benin D Adandedjan --- , Benin R Nechifor --- , Romania A Chikou --- , Benin IM Lazar --- , Romania P Laleye --- , BeninThe Alibori River, which flows through Benin’s cotton crop regions, receives surface water from much of the cultivated land that is situated along its banks. Chemical pollution in surface runoff from this land use threatens the ecological quality of the... -
Diet of a generalist mammalian mesocarnivore in an urban matrix
Item type: Journal Article • Journal: African Zoology • Authors: Jarryd P Streicher --- , South Africa Melanie B Streicher --- , South Africa Tharmalingam Ramesh --- , South Africa Colleen T Downs --- , South AfricaAnthropogenic habitat conversion through urban sprawl is driving mesocarnivores to modify their behaviour and ecology. Thorough knowledge of their feeding ecology is fundamental in understanding the pressures imposed on mesocarnivores by urbanisation. The diet of the water mongoose Atilax paludinosus... -
A comparative review of decision support tools routinely used by selected transboundary River Basin Organisations
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Bukhari --- , South Africa CA Brown --- , South AfricaAs human pressures on water resources increase, the data and decision support (DS) tools used in the governance, development and management of transboundary rivers are likely to become increasingly important. There are no universal, standardised selection processes or designs for... -
The Freshwater Biodiversity Information System (FBIS) – mobilising data for evaluating long-term change in South African rivers
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Helen Dallas --- , South Africa Jeremy Shelton --- , South Africa Tim Sutton --- , South Africa Dimas Tri Cuptura --- , South Africa Mohammed Kajee --- , South Africa Nancy Job --- , South AfricaAccess to long-term biodiversity datasets is vital for monitoring, managing and protecting freshwater ecosystems. Detecting critical ecosystem changes, such as losing unique biodiversity and ecosystem services, is dependent on access to data. A wealth of biodiversity data exists for river... -
The contribution and value of the trait-based approach to water resource protection
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Oghenekaro Nelson Odume --- , South AfricaFreshwater is one of the Earth’s most crucial resources for social-economic development and prosperity. Biomonitoring contributes to water resource protection by integrating a holistic picture of ecosystem health through an analysis of resident biota. The taxonomy-based approach, in which taxa... -
Farmers’ knowledge, attitudes, and perceptions for the adoption of in-field rainwater harvesting (IRWH) technique in Thaba Nchu, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Admire Rukudzo Dzvene --- , South Africa Weldemichael Tesfuhuney --- , South Africa Sue Walker --- , South Africa Andries Fourie --- , South Africa Cobus Botha --- , South Africa Gert Ceronio --- , South AfricaA systematic engagement strategy was used to identify contextual factors that prevent farmers from accepting the in-field rainwater harvesting (IRWH) technique. The purpose of the qualitative study is to assess farmers’ knowledge and attitudes about the technique, as well as... -
Analysis of domestic water consumption in peri-urban South Africa: The case study of Thohoyandou in Limpopo province, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: M. Muloiwa --- , South Africa M. O. Dinka --- , South Africa S. Nyende-Byakika --- , South AfricaThe aim of the paper was to analyze factors affecting domestic water consumption in Thohoyandou, Limpopo province, South Africa. A structured questionnaire was used to collect qualitative and quantitative data in the study area. A total sample of 100 households... -
Investigating the potential for saltpan restoration for the provision of multiple ecosystem services
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Johan Wasserman --- , South Africa Janine B Adams --- , South Africa Daniel A Lemley --- , South AfricaSaltpans are increasingly being abandoned around the world, leading to the loss of ecosystem services provided by these unique semi-natural wetlands. The desertion of a saltpan at the Swartkops Estuary, South Africa has left behind a large area of desiccated... -
Comparison of oxidative stress biomarkers in Oreochromis mossambicus in minimally and highly disturbed aquatic environments in the Matabeleland region, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Z Makuvara --- , Zimbabwe J Marumure --- , Zimbabwe L Chapungu --- , Zimbabwe J Machingura --- , South Africa AH Siwela --- , ZimbabweOwing to their ability to provide a functional measure of organismal response to chemical stressors, oxidative biomarkers are useful in ecotoxicological studies to assess disturbance in aquatic environments. This study assessed the use of oxidative stress biomarkers in Oreochromis mossambicus... -
Flow alterations and nutrient loading reduce primary producer variability in a temporarily closed microtidal estuary in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Monique Nunes --- , South Africa Daniel A Lemley --- , South Africa Janine B Adams --- , South AfricaPrimary producer responses to cumulative regulating factors were investigated in a temporarily closed microtidal estuary. We hypothesised that the phytoplankton chlorophyll-a concentration (Chl a) and invasive alien aquatic plant (IAAP) abundance would be highest during the low-flow season and that... -
Validation of lipid extraction and correction methods for stable isotope analysis of freshwater food webs in southern Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A van der Merwe --- , South Africa A Myburgh --- , South Africa G Hall --- , South Africa A Kaiser --- , South Africa S Woodborne --- , South AfricaStable isotope analysis is ubiquitous as a method to investigate food-web dynamics at various scales in aquatic ecology. Most studies make use of dorsal muscle tissue, which involves lethal sampling of the fish. The sampling of muscle tissue is often... -
An assessment of water and sediment quality of aquatic ecosystems within South Africa’s largest floodplain
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D van Rooyen --- , South Africa R Gerber --- , South Africa NJ Smit --- , South Africa V Wepener --- , South AfricaNdumo Game Reserve (NGR), a Ramsar site, situated in South Africa’s largest floodplain (Phongolo River floodplain) in northern KwaZulu-Natal, with important aquatic ecosystems: the Usuthu and Phongolo rivers and their associated floodplain lakes. While the Phongolo River is regulated, the... -
Technical feasibility of producing binder-free water hyacinth briquettes for domestic energy use
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Thawani Sanjika* --- , Malawi Grivin Chipula --- , MalawiProduction of biomass briquettes of good strength and combustion characteristics usually requires the addition of a binder material to the feedstock. This study was aimed at developing a methodology for producing briquettes from water hyacinth at low compression pressures without... -
A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Edworthy --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa WM Potts --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa S Dupont --- University of Gothenburg, Sweden MI Duncan --- Rhodes University, South Africa TG Bornman --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaCompared with the open ocean, knowledge of pH variability in coastal waters is rudimentary, especially in Africa. This is concerning as quantifying local pH conditions is critical when assessing the response of coastal species to future ocean acidification scenarios. The... -
uMama wekhaya: local subjectivities, water infrastructures and grounded perceptions of development in Agnes Rest, Eastern Cape, South Africa
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Zikhona N. Ngqula --- University of the Witwatersrand, South AfricaThis article provides a window into the lives of the residents of Agnes Rest, a rural village in the Eastern Cape province of South Africa. Using water infrastructures, I explore how two local terms umama wekhaya and abuntu babelungu, express... -
Sludge as an initial nutrient driver for yield improvement in the poor soils of northern Namibia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Ehsan Ebrahimi --- University of Rostock, Germany Jana Zinkernagel --- Hochschule Geisenheim University, GermanyThe northern part of Namibia suffers from drought and low-quality soil. The soil needs a boost of nutrients, and the water must be used in a frugal manner. Thereby, the objective of this research was to investigate the effect of... -
Zooplankton distribution and community structure as a function of environmental variables in the Niger River and its tributaries in Niger
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Souley Adamou --- Université de Toulouse, France B Alhou --- Université Abdou Moumouni de Niamey, Niger M Tackx --- Université de Toulouse, France F Azémar --- Université de Toulouse, FranceThe Niger River and its main tributaries (Sirba, Tapoa and Mékrou) in Niger were sampled during high and low water flow with the objectives of (1) comparing the taxonomic structure, diversity and abundance of the zooplankton community (rotifers, copepods, crustaceans)... -
Colonisation theory and invasive biota: the Great Fish River case history, 35 years later
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Pule P Mpopetsi --- Rhodes University, South Africa Wilbert T Kadye --- Rhodes University, South AfricaUsing the Great Fish River, South Africa, Laurenson and Hocutt (1986) proposed a colonisation theory outlining the characteristics of successful invaders and the properties of aquatic habitats that facilitate successful fish invasions. The Great Fish River has modified flow due... -
Assessment of water quality for suitability and human health risk: a study of the Owan River, Edo State, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Nkonyeasua Kingsley Egun --- University of Benin, Nigeria Ijeoma Patience Oboh --- University of Benin, NigeriaSuitability assessment of water bodies for human consumption and its implication on human health is critical to water resources utilisation and sustainable development. This study investigated the water quality of the Owan River and the potential health risk to users... -
‘Flash Mobula’: first observations of courtship behaviour of the shortfin devil ray Mobula kuhlii
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Carpenter --- University of Cape Town, South Africa C Griffiths --- University of Cape Town, South AfricaFirst-time observations of courtship behaviour of the Endangered shortfin devil ray Mobula kuhlii are described from the Aliwal Shoal Marine Protected Area (MPA), KwaZulu-Natal, South Africa. Three events of M. kuhlii courtship, called ‘mating trains’, were recorded on video during... -
Wind- and eddy-driven upwelling over submarine canyons inshore of the northern Agulhas Current
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Rautenbach --- Nelson Mandela University, South Africa J Hermes --- , South Africa I Halo --- , South Africa T Morris --- , South Africa J Veitch --- , South AfricaThe iSimangaliso Wetland Park, located along the coastline of northern KwaZulu-Natal, hosts South Africa’s only subtropical coral reef system. Episodic upwelling events are observed inshore and at the heads of Diepgat, Leadsman and Leven canyons within the iSimangaliso Wetland Park... -
Plantation water productivity (PWPWOOD) and not water-use efficiency (WUE) as the measure of commercial plantation yield improvement: a review
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nkosinathi D Kaptein --- University of KwaZulu-Natal, South Africa Alistair D Clulow --- University of KwaZulu-Natal, South Africa Michele Toucher --- University of KwaZulu-Natal, South Africa Colin S Everson --- University of KwaZulu-Natal, South Africa Steven B Dovey --- Shaw Research Institute, South Africa Ilaria Germishuizen --- Institute for Commercial Forestry Research, South AfricaGlobal demand for forest products is ever-increasing, creating competition for water between downstream water users and commercial forest producers. Tree production should therefore aim at the effective use of water by producing maximum tree biomass from water used with the... -
Dissipation of environmental DDT and its metabolites in selected rivers of south-western Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JK Nyaundi --- Kenya Marine and Fisheries Research Institute, Kenya SK Omasaki --- Kisii University, Kenya JM Babu --- Kenya Marine and Fisheries Research Institute, Kenya NM Mwirigi --- Kenya Marine and Fisheries Research Institute, Kenya R Omondi --- Kisii University, Kenya GA Mwayulj --- Great Lakes University of Kisumu, Kenya S Bassa --- National Fisheries Resources Research Institute (NaFIRRI), UgandaRivers are the main source of domestic and industrial water supplies in Kenya. In this study, water sampling was done at eight upstream sites in the Kuja River catchment, Kenya, between October 2016 and April 2017, specifically to test for... -
Water quality profile and metal pollution indices of the main stream of the Nile River in Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Manar M Hussein --- National Institute of Oceanography and Fisheries (NIOF), Egypt Mohamed E Goher --- National Institute of Oceanography and Fisheries (NIOF), Egypt Ahmed H Mangood --- Menofia University, Egypt Ibrahim E Mousa --- University of Sadat City, EgyptThe lower Nile River is a vital drinking and irrigation water source in Egypt. Human activities adjacent to rivers deteriorate the quality of such water resources. The water quality profiles of 23 sites along the Nile were calculated in accordance... -
Spatio-temporal variation in phytoplankton community structure in backwaters of the Ketar River, central Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Yadesa Chibsa --- Wachemo University, Ethiopia Seyoum Mengistou --- Addis Ababa University, Ethiopia Demeke Kifle --- Addis Ababa University, EthiopiaThis study assessed the spatio-temporal dynamics of the phytoplankton community in backwaters of the Ketar River, central Ethiopia, in relation to water quality and macrophyte coverage. Phytoplankton samples and physicochemical information were collected at six sites along the river over... -
Long-term study of the drought impact on the phytoplankton concentration and assemblages in two water supply reservoirs in Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Johannes Sirunda --- Namibia Water Corporation, Namibia Paul Oberholster --- University of the Free State, South Africa Gideon Wolfaardt --- Stellenbosch University, South Africa Christoff Truter --- Toronto Metropolitan University, Canada Sean van der Merwe --- University of the Free State, South AfricaRising temperatures and increased occurrences of droughts, brought on by climate change, are expected to affect reservoir water levels. We hypothesised that the decrease in reservoir volumes in dams with desert climates will favour the growth of phytoplankton biomass, measured... -
Environmental stressors influence the biological water quality of a lotic system in southwestern Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Akindele --- Obafemi Awolowo University, Nigeria SA Olaniyan --- Institute of Ecology and Environmental Studies, Obafemi Awolowo University, Nigeria AM Adedapo --- Obafemi Awolowo University, NigeriaDeforestation in the Afrotropical realm is extensively encroaching on riparian corridors, causing increasingly negative impacts on freshwater biota. This study aimed to assess the biological water quality of an Afrotropical river in southwestern Nigeria whose riparian corridor is threatened by... -
Limnological features and water-quality changes of two Ethiopian Rift Valley lakes, Lake Abaya and Lake Chamo
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Dagne --- National Fishery and Aquatic Life Research Center, Ethiopia H Tadesse --- National Fishery and Aquatic Life Research Center, Ethiopia K Teshome --- National Fishery and Aquatic Life Research Center, EthiopiaWe conducted a study in Lake Abaya and Lake Chamo, the two largest Ethiopian Rift Valley lakes, between 2016 and 2019, to evaluate their limnological features and infer longer-term changes in some water-quality parameters. Data generated through in situ measurements... -
Relationship between sediment grain sizes and macroinvertebrate distribution along the Isiukhu River, western Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Emmanuel Mzungu --- Masinde Muliro University of Science and Technology, Kenya Anthony W Sifuna --- Masinde Muliro University of Science and Technology, Kenya William A Shivoga --- Masinde Muliro University of Science and Technology, KenyaThe current study investigated the relationship between sediment grain sizes and macroinvertebrate distribution along the Isiukhu River, a tropical stream in western Kenya. Ten sites in total were selected from the upstream, midstream and downstream areas. Sampling of sediments and... -
Role of the Lethabo Weir in altering the phytoplankton community structure of the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Janse van Vuuren --- North-West University, South Africa A Swanepoel --- , South AfricaDuring 2012, aerial photographs of the Vaal River, South Africa, showed differences in water colour on either side of the Lethabo Weir. Water upstream of the weir was muddy brown, while water downstream was olive-green. Physical and chemical analyses indicated... -
Rainfed-based production of Megathyrsus maximus in sub-Saharan Africa: the case of the semi-arid environment of Sudan
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hussein I Mohamed --- , Sudan Shamseddin M Ahmed --- Water Management and Irrigation Institute, University of Gezira, Sudan Adil D Mohamed --- Water Management and Irrigation Institute, University of Gezira, SudanThe performance of rainfed-based Megathyrsus maximus (syn. Urochloa maxima and Panicum maximum) was investigated in the semi-arid pastures of Sudan. Split-plot complete design experiments with three replications were applied for two consecutive seasons (2020–2021). The treatments were two in situ... -
Understanding the effects of climate change on Southern Ocean ecosystems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD McQuaid --- Rhodes University, South AfricaUnderstanding the future of Southern Ocean ecosystems requires approaches at micro to macro scales. The Southern Ocean has experienced both top-down and bottom-up perturbations driven by man. The removal of whales and finfish was a top-down disruption, removing enormous levels... -
Fine-scale drivers of extinction risk: tadpole occupancy dynamics of the Table Mountain Ghost Frog (Heleophryne rosei)
Item type: Journal Article • Journal: African Zoology • Authors: --- South African National Biodiversity Institute, Kirstenbosch Research Centre, South Africa --- University of Cape Town, South Africa --- , South Africa --- , South AfricaOver the last four decades much progress has been made towards recognising causes of global amphibian declines, but knowledge of fine scale drivers, particularly for specialised species, remains poor, inhibiting conservation effectiveness. The case of the Table Mountain Ghost frog... -
Marine macroalgae of the Agulhas Marine Province of South Africa: biodiversity, exploitation and potential for aquaculture
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JJ Bolton --- University of Cape Town, South Africa CD McQuaid --- Rhodes University, South AfricaThe Agulhas Marine Province (AMP) extends along most of the south coast of South Africa, from Cape Agulhas to the vicinity of the Mbashe River mouth in the Eastern Cape Province, and has its own distinctive warm-temperate seaweed flora, with... -
Effects of succinic acid impregnation on physical properties of sapwood and heartwood from plantation-grown short-rotation teak
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sarah Augustina --- National Research and Innovation Agency (BRIN), Indonesia Teguh Darmawan --- National Research and Innovation Agency (BRIN), Indonesia Sudarmanto --- National Research and Innovation Agency (BRIN), Indonesia Narto Narto --- National Research and Innovation Agency (BRIN), Indonesia Adik Bahanawan --- National Research and Innovation Agency (BRIN), Indonesia Danang S Adi --- National Research and Innovation Agency (BRIN), Indonesia Dimas Triwibowo --- National Research and Innovation Agency (BRIN), Indonesia Yusup Amin --- National Research and Innovation Agency (BRIN), Indonesia Imran A Sofianto --- National Research and Innovation Agency (BRIN), Indonesia Prabu S Sejati --- National Research and Innovation Agency (BRIN), Indonesia Wahyu Dwianto --- National Research and Innovation Agency (BRIN), Indonesia Witjaksono --- National Research and Innovation Agency, Indonesia Ragil Widyorini --- Universitas Gadjah Mada, Philippe Gérardin --- Université de Lorraine, France Sari Delviana Marbun --- National Research and Innovation Agency (BRIN), IndonesiaThe aim of this study was to improve the properties of 15-year-old short rotation teak wood using a succinic acid (SA) treatment without excessively increasing the weight gain. The samples were classified as sapwood (SW) and heartwood (HW). Samples were... -
Water quality monitoring and measuring physicochemical parameters using wireless sensor networks
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Satyanarayana Murthy --- , India SF Ahamed --- , IndiaIn a world grappling with the dire consequences of poor sanitation and inadequate water conditions, there is an urgent need for a comprehensive solution. The staggering statistics of over 400 million affected cases and 15–25 million lives lost worldwide underscore... -
South African coastal outlets and estuaries: what defines an estuary versus an outlet?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Alan K Whitfield --- South African Institute for Aquatic Biodiversity, South AfricaThis review examines the transition of coastal micro-outlets to micro-estuaries, to fully functional and species rich estuaries of various types. The definitions of the different types of microsystems are reviewed and it is apparent that an estuary is not simply... -
Effect of abattoir activities on the quality of water and surrounding soil of the Anwai River in Asaba, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OT Fatunsin --- University of Lagos, Nigeria IG Enenya --- University of Lagos, Nigeria P Ebomese --- University of Lagos, NigeriaThe Anwai River is the most important river in Asaba, Nigeria, because of its many uses, and these include abattoir activities. The aim of this study was to assess the surface water and surrounding soil of the Anwai River for... -
Transpiration efficiency of lucerne under unlimited soil water conditions during the first growing season
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CM Tfwala --- University of the Free State, South Africa G Mengistu --- University of the Free State, South Africa IB Ukoh Haka --- University of the Free State, South Africa LD van Rensburg --- University of the Free State, South Africa CC du Preez --- University of the Free State, South AfricaLucerne production is regarded as requiring high water inputs, making it necessary to understand its transpiration efficiency, especially in countries with water scarcity such as South Africa. The resurgent opportunities in the local lucerne markets prompted the publication of this... -
Biology and ecology of the African blackspot shark Carcharhinus humani on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Cliff --- KwaZulu-Natal Sharks Board, South Africa NG Booyens --- School of Life Sciences, University of KwaZulu-Natal, South Africa R Daly --- Oceanographic Research Institute (ORI), South Africa GL Jordaan --- Oceanographic Research Institute (ORI), South Africa N Nkabi --- KwaZulu-Natal Sharks Board, South Africa D Parker --- Commonwealth Scientific and Industrial Research Organization, Australia BQ Mann --- Oceanographic Research Institute (ORI), South AfricaThe African blackspot shark Carcharhinus humani (until now commonly known as Human’s whaler shark) is a small-sized requiem shark (family Carcharhinidae) found in tropical coastal waters of the western Indian Ocean as far south as Port St Johns on the... -
New data on the clupeoids of lakes Mai-Ndombe and Tumba, western Democratic Republic of the Congo, using an integrated approach combining morphology and barcoding
Item type: Journal Article • Journal: African Zoology • Authors: Bo Delling --- , Sweden Norbert Lingopa Zanga --- Institut Supérieur de Pêche (ISPê), Congo Michael Norén --- , SwedenMorphological and molecular comparisons of clupeoid fishes in lakes Tumba and Mai-Ndombe in the Congo Basin revealed that a large-sized form of a common species in Lake Mai-Ndombe had not been distinguished from the small-sized endemic Mai-Ndombe dwarf sprat Nannothrissa... -
Species diversity and distribution-pattern determinants of African rivulines (Cyprinodontiformes: Nothobranchiidae) in rainforest streams of southern Cameroon
Item type: Journal Article • Journal: African Zoology • Authors: FD Messu Mandeng --- Higher Teacher’s Training College (ENS), University of Yaoundé I, Cameroon CF Bilong Bilong --- University of Yaoundé I, Cameroon JF Agnese --- University of Montpellier (CNRS, IRD, EPHE), FranceUnderstanding the community structure and ecology of fish populations in rainforest streams is a prerequisite for any actions towards their exploitation, management or conservation. We examined the community structure and species diversity of nothobranchiids (African rivulines) in rainforest streams of... -
Assessment of surface water quality in a highly anthropised semi-arid catchment (Case of Wadi El Hatab Basin, Tunisia, North Africa)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Hayouni --- University of Sfax, Tunisia N Chkir --- University of Sfax, Tunisia S Pistre --- Université Montpellier, France K Zouari --- University of Sfax, TunisiaAnthropogenic contamination of surface waters is a critical issue in urbanised catchments, especially in Mediterranean environments with scarce water resources and intermittent rivers. A combined hydro-geochemical and multivariate statistical methodology has been applied to evaluate the surface water quality of... -
Status and distribution of a novel redfin lineage, Pseudobarbus sp. ‘burchelli Tradouw’ from the Cape Fold Ecoregion of South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Martine S. Jordaan --- , South Africa Stuart Barrow --- , South Africa Wilbert Kadye --- Rhodes University, South Africa Albert Chakona --- NRF-South African Institute for Aquatic Biodiversity (NRF-SAIAB), South AfricaFreshwater fish are threatened globally and in addition, knowledge of their diversity is incomplete and species richness is underestimated. Within the ichthyofauna of the Cape Fold Ecoregion of South Africa, many undescribed lineages exist and for most of these, information... -
Appraisement of groundwater quality status within Enugu, Nigeria, using physicochemical evaluation and water quality indices
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Kelvin Ifeanyi Ekpete --- University of Nigeria, Nigeria Patricia Ebele Igbo --- University of Nigeria, Nigeria Hillary Onyeka Abugu --- University of Nigeria, Nigeria Solomon Obialo Onwuka --- University of Nigeria, Nigeria Nnamdi Lawrence Obasi --- University of Nigeria, Nigeria Chukwuma OB Okoye --- University of Nigeria, NigeriaEnugu state is notorious for potable water scarcity which forces residents to depend on polluted water sources. In this study, an appraisement of the quality status of groundwater from some areas within Enugu was conducted. Physicochemical characteristics of groundwater sampled... -
Multi-method approach identifies a South African estuary as an important elasmobranch habitat and potential nursery ground
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Elston --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa TS Murray --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaElasmobranchs play important ecological roles but are highly threatened. Understanding their habitat use and abundance is crucial for the management and conservation of these species and their habitats. While some species are known to use estuaries as vital habitats (e.g... -
Influence of different temperatures on seedling growth and development of Calobota sericea, a semi-arid rangeland species of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Francuois Müller --- Agricultural Research Council – Animal Production Institute, South African National Forage Genebank, South Africa Letty Masemola --- Agricultural Research Council – Animal Production Institute, South African National Forage Genebank, South Africa Fortune Manganyi --- Agricultural Research Council – Animal Production Institute, South African National Forage Genebank, South Africa Nothando Ngcobo --- Agricultural Research Council – Animal Production Institute, South African National Forage Genebank, South AfricaThis study determined how temperature affected the early growth of seedlings of Calobota sericea (Thunb.) Boatwr. & B.-E.van Wyk. One-month-old C. sericea seedlings were grown at constant temperatures of 2.5, 5, 10 and 20 °C for 30 days. After 30... -
Water-quality assessment and spatial distribution of water-quality parameters of Dodoma Urban, Tanzania
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OJ Mdee --- University of Dodoma, Tanzania B Mndolwa --- University of Dodoma, Tanzania N Sadiki --- University of Dodoma, TanzaniaThe study was conducted in 2022 in shallow wells and deep boreholes owned by residents, to investigate the water quality status in the emerging developing area of Dodoma Urban municipality in central Tanzania. Eighteen boreholes and five shallow wells were... -
Spatial and seasonal variation of microplastics and surface water quality of the Njoro River and Lake Nakuru ecosystems, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Petra Kienyiy Chui --- Egerton University, Kenya Bernard Kibet Kirui --- Egerton University, Kenya Meshack Amos Obonyo --- Egerton University, KenyaHigh levels of plastic pollutants threaten aquatic habitats as the plastic materials are ingested by aquatic organisms as food. This study assessed seasonal variations of microplastics and the water quality of the Njoro River and Lake Nakuru, Kenya. Selected water... -
The impact of printing industry effluent on the growth and antioxidant response of the freshwater green microalga Chlorella sorokiniana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IY Okpanachi --- Nigerian Army University Biu, Nigeria U Aminu --- Ahmadu Bello University, Nigeria AO Jolaoso --- University of Lagos, Nigeria WN Yusufu --- Ahmadu Bello University, Nigeria E Abdulmalik --- Ahmadu Bello University, Nigeria MA Chia --- Ahmadu Bello University, NigeriaContamination of aquatic ecosystems with printing industry wastewater is a serious concern because of the toxicity associated with the effluent components and a tendency to create cascading ecological effects. The influence of printing-press effluent on the freshwater microalga Chlorella sorokiniana... -
Contrast in larval sensitivity to low pH in sea urchins from neighbouring seagrass meadows at Inhaca Island, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JA Duvane --- Eduardo Mondlane University, Mozambique D Cossa --- Eduardo Mondlane University, Mozambique DC de Abreu --- Eduardo Mondlane University, Mozambique M Mafambissa --- Eduardo Mondlane University, Mozambique MP Scarlet --- Eduardo Mondlane University, Mozambique A Macia --- Eduardo Mondlane University, Mozambique S Dupont --- University of Gothenburg, SwedenOcean acidification presents a major threat to marine life, and a large body of evidence has documented its negative effects on various marine species and ecosystems. Recent meta-analyses highlight the key role of local adaptation and have linked species’ sensitivity... -
Cooperation in common property resource management: A group engagement approach
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Evans Shoko --- Cape Peninsula University of Technology, South Africa Bongani Ncube --- Cape Peninsula University of Technology, South AfricaThis study explored motivational cooperative behaviour types as a communal resource in a rural Zimbabwean setting. Using the group engagement model, the study examined motivational cooperative behaviour types in managing in managing water resources. Thirty community residents of Mhondoro-Ngezi District... -
Perceptions and knowledge about the use of biological indicators in freshwater ecosystem monitoring in Rwanda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Nzarora --- College of Science and Technology, University of Rwanda, Rwanda C Cocquyt --- , Belgium V Nzibaza --- Center of Excellence in Biodiversity and Natural Resources Management, University of Rwanda, Rwanda V Nsengimana --- College of Science and Technology, University of Rwanda, Rwanda PJ Mugume --- Center of Excellence in Biodiversity and Natural Resources Management, University of Rwanda, Rwanda BA Kaplin --- College of Science and Technology, University of Rwanda, RwandaThe use of biological monitoring (biomonitoring) to assess water quality is recognised alongside the use of chemical and physicochemical parameters due to its ability and efficiency in providing information about both current and long-term changes. Indeed, biomonitoring is applied in... -
Comparative analysis of habitat structure and macroinvertebrate assemblages in headwater streams of Odzi sub-catchment, Chimanimani District, Zimbabwe, post Cyclone Idai-induced flooding
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Brian Mamvura --- , Zimbabwe Tongayi Mwedzi --- Chinhoyi University of Technology, Zimbabwe Beaven Utete --- Chinhoyi University of Technology, ZimbabweFlooding results in short and long-term modifications of aquatic ecosystem structure and biodiversity. Cyclone Idai, which ravaged through Zimbabwe in 2019, had devastating consequences on aquatic ecosystems. However, the extent of habitat modification and consequent biodiversity shifts are unknown. This... -
The use and protection of water resources in the uThukela River Catchment, South Africa: a review of its past, present and future
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Wade --- University of Mpumalanga, South Africa GC O’Brien --- Gulbali Institute, Charles Sturt University, Australia G Jewitt --- IHE Delft Institute for Water Education, the NetherlandsSouth Africa is a water-stressed country and therefore the quantity and quality of the water resources are very important. The uThukela River is one of South Africa’s largest rivers and is a critical component of water resource utilisation in South... -
Impact of climate change on the distribution of the invasive water hyacinth in Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Abdulbasit Hussein --- School of Natural Resources Management and Environmental Sciences, College of Agriculture and Environmental Sciences, Haramaya University, Ethiopia Solomon Estifanos --- School of Natural Resources Management and Environmental Sciences, College of Agriculture and Environmental Sciences, Haramaya University, Ethiopia Tolesa Negese --- School of Natural Resources Management and Environmental Sciences, College of Agriculture and Environmental Sciences, Haramaya University, EthiopiaThe introduction of exotic species poses one of the greatest threats to biodiversity globally. Water hyacinth is a dangerous invasive species that has harmed Ethiopia’s wetland ecology and economy. This research aims to evaluate the current distribution of water hyacinth... -
Predator avoidance by mesopredatory benthic sharks in response to potential predators in a natural environment
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DBS Rooth --- National Institute of Aquatic Resources, Technical University of Denmark, Denmark RGA Watson --- , South AfricaSome benthic elasmobranch mesopredators utilise crypsis to avoid predation by higher trophic predators. While this ability has been documented in various elasmobranchs such as rays, cryptic behaviour has been scarcely documented in catsharks (family Scyliorhinidae). Freezing behaviour by leopard catsharks... -
Nitrogen requirements of canola (Brassica napus L.) at sustained deficit irrigation levels in central Free State, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: KA Seetseng --- University of the Free State, South Africa JH Barnard --- University of the Free State, South Africa CC du Preez --- University of the Free State, South AfricaIn South Africa canola (Brassica napus L.) is cultivated in rotation with wheat under winter rainfall in the Western Cape province. Expansion of the crop to the other eight provinces is propagated to reduce a shortage of locally produced plant... -
Colonisation patterns and reef growth of the invasive serpulid Ficopomatus enigmaticus in a Greek coastal lagoon
Item type: Journal Article • Journal: African Zoology • Authors: Athanasia-Violeta Ntzoumani --- University of Patras, Greece Sarah Faulwetter --- University of Patras, Greece Konstantinos G Nikolakopoulos --- University of Patras, Greece Pavlos Avramidis --- University of Patras, Greece Alexis Ramfos --- University of Patras, GreeceThe reef-building serpulid polychaete Ficopomatus enigmaticus is an invasive species in brackish waters in tropical and temperate zones worldwide and often has massive impacts on ecosystems and anthropogenic activities. In Prokopos Lagoon in Greece, the species has constructed large reefs... -
Diversity, distribution and knowledge gaps of Polychaeta on the continental shelf of southern Namibia
Item type: Journal Article • Journal: African Zoology • Authors: Amoré Malan --- , South Africa Aiden Biccard --- , South Africa Jessica Dawson --- , South Africa Robyn Payne --- , South Africa Kevin Schmidt --- , South Africa Kirti N Gihwala --- , South Africa Ken Hutchings --- , South Africa Deon Louw --- , Namibia Josef Shikeva --- , Namibia Blessing Kamwi --- , Namibia Lapaka Kaimbi --- , Namibia Julien Vumazonke --- , Namibia Megameno Mutaleni --- , Namibia Thomas Shannon --- , United Kingdom Sarah Chordekar --- , United Kingdom Vere Ross-Gillespie --- , United KingdomThis study investigated the diversity, composition and distribution patterns of polychaete macrofauna inhabiting unconsolidated sediments on the continental shelf of southern Namibia. During the austral summer of 2021, 910 Van Veen grab samples were collected from 91 sites in water... -
A new species of Malacoceros (Annelida, Polychaeta, Canalipalpata, Spionidae) from urban waters in Gabon
Item type: Journal Article • Journal: African Zoology • Authors: Nicolas Lavesque --- Université de Bordeaux, CNRS, Bordeaux INP, EPOC, France Aimé Roger Nzigou --- Université des Sciences et Techniques de Makusu (USTM), Gabon Guillemine Daffe --- Université de Bordeaux, Observatoire Aquitain des Sciences de l’Univers, France Johann Ludovic Martial Happi --- Université des Sciences et Techniques de Makusu (USTM), Gabon Geon Hyeok Lee --- National Institute of Biological Resources, Seo-gu, Korea Karin Meißner --- Senckenberg am Meer, Deutsches Zentrum für Marine Biodiversitätsforschung (DZMB), GermanyA new species of Malacoceros is described from estuarine equatorial waters in Libreville (Gabon, West Africa). During a recent environmental study aimed to assess the urban impact on an estuarine ecosystem near Libreville, the collection of sediment samples from the... -
Establishment of determinants to influence community acceptance towards water reuse in India
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Kirti Goyal --- Lovely Professional University, India Arun Kumar --- Indian Institute of Technology, IndiaWorldwide, rising water scarcity calls for alternatives to supplement the water supplies. Water reuse is an emerging source, ensuring water safety and environmental sustainability, but its growth is hindered due to sparse public acceptance. In this study, a social survey... -
Effects of eucalypt and black wattle biochars from vacuum pyrolysis on sandy soil quality and cauliflower yield
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S Mncedi --- Stellenbosch University, South Africa JF Görgens --- Stellenbosch University, South Africa PA Swanepoel --- Stellenbosch University, South Africa AG Hardie --- Stellenbosch University, South AfricaWoody invasive alien plants (IAPs), including black wattle (Acacia mearnsii De Wild.) and eucalypt species (Eucalyptus camaldulensis Dehnh.), present significant environmental challenges in South Africa. Biochar from these plants can enhance soil carbon sequestration and fertility. This study examines the... -
Influence of spatio-temporal variations in precipitation and temperature on the productivity of Eastern Lake Kyoga, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: John Peter Obubu --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Robinson Odong --- Entomology and Fisheries Sciences, Makerere University, Uganda Seyoum Mengistou --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Tadesse Fetahi --- African Centre of Excellence for Water Management, Addis Ababa University, Ethiopia Tena Alamerew --- Ethiopian Institute of Water Resource, Addis Ababa University, Ethiopia Ekwacu Samuel --- Uganda National Meteorological Authority, UgandaSpatio-temporal variations in precipitation and temperature affect productivity in aquatic systems, mainly through nutrient dynamics. Shallow lakes are more vulnerable to spatio-temporal variations, yet they are an important resource for biodiversity conservation, water supply and fisheries. The eastern arm of... -
Littoral substrates and nest properties of Coptodon rendalli vary with distance from the shoreline in a tropical impoundment, southeast Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RJ Chateya --- National University of Science and Technology, Zimbabwe HGT Ndagurwa --- National University of Science and Technology, ZimbabweThe change in littoral substrates and Coptodon rendalli nest properties along the inshore–offshore gradient of Mushandike Dam in southeast Zimbabwe, impacted by long-term water-level fluctuations, were studied in March 2016. Substrate and nest properties were measured in four contiguous 25... -
Assessment of the inland wetland ecosystem types in South Africa: threats and protection
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H van Deventer --- Council for Scientific and Industrial Research (CSIR), South Africa Jeanne L Nel --- , The NetherlandsEcosystem threat status (ETS) and ecosystem protection levels (EPLs) are headline indicators that can assess freshwater ecosystems at a country-wide scale. A spatial layer of freshwater, inland wetland ecosystem types of South Africa was combined with a range of spatial... -
Breeding ecology of the Madagascar Grebe Tachybaptus pelzelnii in Bemanevika Protected Area in the northern highlands of Madagascar
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Delphin Rasolonjatovo --- The Peregrine Fund Madagascar Project, Madagascar Lily-Arison Rene De Roland --- The Peregrine Fund Madagascar Project, Madagascar Tolojanahary Andriamalala --- The Peregrine Fund Madagascar Project, Madagascar Marius Rakotondratsima --- The Peregrine Fund Madagascar Project, Madagascar Séraphin Fabrice --- The Peregrine Fund Madagascar Project, Madagascar Stéphanie Razakaratrimo --- The Peregrine Fund Madagascar Project, Madagascar Yverlin ZM Pruvot --- The Peregrine Fund Madagascar Project, Madagascar Russell Thorstrom --- The Peregrine Fund, United StatesWe studied the breeding ecology of the endangered Madagascar Grebe Tachybaptus pelzelnii (family Podicipedidae) at Bemanevika Protected Area, during two consecutive years (October 2020–September 2022). Two breeding units were observed: pairs and trios made up of one male and two... -
Rapid spread of Euglena sanguinea Ehrenberg (Phylum Euglenophyta) in South African freshwater bodies: A potential threat
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Sanet Janse van Vuuren --- North-West University, South Africa Anatoliy Levanets --- North-West University, South Africa Daniël Erasmus --- North-West University, South AfricaEuglena sanguinea is a red-pigmented euglenid species known for producing the ichthyotoxin euglenophycin, which has been associated with fish mortalities in various freshwater systems. First reported in South Africa from the Kruger National Park in 2016, E. sanguinea has since... -
Influence of water physico-chemical properties and vegetation type on the distribution of schistosomiasis intermediate host snails in Nelson Mandela Bay, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PS Campbell --- Nelson Mandela University, South Africa JB Adams --- Institute for Coastal and Marine Research and Department of Botany, Nelson Mandela University, South Africa M Thwala --- Nelson Mandela University, South Africa O Oyedele --- Nelson Mandela University, South Africa PE Melariri --- Nelson Mandela University, South AfricaSchistosomiasis is an infectious water-borne disease transmitted by Schistosoma flatworms. Humans become infected through skin penetration following exposure to water contaminated with schistosome cercariae. This study assessed the physico-chemical properties of the water bodies, vegetation type, distribution and habitat presence... -
Behavioural responses to air temperature change in helmeted guineafowl Numida meleagris
Item type: Journal Article • Journal: African Zoology • Authors: Johann H van Niekerk --- University of South Africa, South Africa Marta Rodríguez-Rey --- Universidad de Alcalá, Forest Ecology and Restoration Research Group (FORECO), Spain Fabián Casas --- Universidad de Granada, Spain Giovanni Forcina --- Global Change Ecology and Evolution Research Group (GloCEE)/Soil Biology and Subterranean Ecosystems Research Group (GIBSES), SpainDeciphering the behavioural responses of helmeted guineafowl Numida meleagris (Linnaeus, 1758) to temperature variation is key to understanding its eco-ethology and implementing sound management strategies. Here, we tested the ‘warmer together’ hypothesis, which states that thermoregulatory cost reduction (i.e. body... -
Spatial and temporal distribution of shallow-water hake Merluccius capensis off the south coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LCJ Nomxego --- Fisheries and the Environment (DFFE), South Africa OS Kjesbu --- Institute of Marine Research, Norway WHH Sauer --- Rhodes University, South Africa MR Lipinski --- Rhodes University, South AfricaThis study investigated the spatial and temporal distribution of shallow-water hake Merluccius capensis off the south coast of South Africa, using 1 807 females collected by bottom trawling during industry and research surveys between 2014 and 2016. Mean body size... -
Managing drought stress in wheat (Triticum aestivum L.) production: strategies and impacts
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Maltase Mutanda --- University of South Africa, South Africa Hussein Shimelis --- School of Agricultural, South Africa Vincent Chaplot --- School of Agricultural, South Africa Sandiswa Figlan --- University of South Africa, South AfricaDrought stress is a major constraint to sustainable wheat production worldwide, including sub-Saharan Africa, where environmental and poor agronomic practices exacerbate the yield gap. Drought disrupts physiological, biochemical, and molescular processes, negatively impacting crop growth, grain yield and quality. This... -
A baseline survey of coastal birds in the Greater Bazaruto region, Mozambique
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Peter G Ryan --- University of Cape Town, South Africa Cliff Dorse --- , South Africa Dave Gilroy --- , Mozambique James Hogg --- , United Kingdom Albert McLean --- , South Africa Christine Read --- , South Africa Evan Trotzuk --- African Parks Mozambique, Mozambique Gary Allport --- The David Attenborough Building, United KingdomWe report the numbers of coastal birds in the Greater Bazaruto Important Bird and Biodiversity Area (IBA), Mozambique. In November–December 2023, we counted waterbirds foraging on tidal flats and at roost sites in the San Sebastian (São Sebastião) Peninsula, Bazaruto... -
9. “Drink lots of clean, safe water”: a food-based dietary guideline for South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Van Graan AE [cor1] Bopape M --- Department of Human Nutrition, University of Limpopo (Turfloop Campus), Phooko D --- Department of Human Nutrition, University of Limpopo (Turfloop Campus), Bourne L --- Environment and Health Research Unit, Medical Research Council, Wright HH --- Centre of Excellence for Nutrition, North-West University,The purpose of this review is to summarise the literature that supports the importance of the food-based dietary guideline on water consumption. General recommendations for total daily water intake are between 2 and 3.7 l for women and men, 0.7... -
An exploratory study into the effect of an outdoor, cold-water immersion course on mood in adolescents in Norway and the UK
Item type: Journal Article • Journal: Journal of Child & Adolescent Mental Health • Authors: C Mark Mark Harper --- University Hospitals Sussex, United Kingdom Viveka Romeyke --- Institute for Nutrition and Public Health, University of Agder, Norway Sophie Shergold --- Worthing General Hospital, United Kingdom Alexandra Ford --- Brighton and Sussex Medical School, United Kingdom Kjersti Karoline Danielsen --- Institute for Nutrition and Public Health, University of Agder, NorwayBackground: Increasing evidence supports the mental health benefits of outdoor, cold-water immersion in adults. This explorative study aimed to see if evidence found in adult populations regarding changes associated with the activity on mood could be replicated in adolescents through... -
Wadi estuary sediments on the Moroccan Mediterranean coast: an assessment of the impact of heavy metals using phytotoxicity and genotoxicity
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Nadia Belemlih --- Scientific Institute, Mohammed V University, Morocco Ahmed Khadra --- Cadi Ayyad University, Morocco Mohamed Oubane --- Cadi Ayyad University, Morocco Tarik Louzizi --- Ibn Tofail University, Morocco Mohammed Fekhaoui --- Scientific Institute, Mohammed V University, MoroccoTo evaluate the genotoxicity in the Loukkos River estuary, chemical and toxicological analyses were performed on water and sediments collected from six wadis. Heavy metal contents (Cr, Cu, Ni, Zn, Cd, Fe, and Pb), germination tests in lettuce, turnip, and... -
Assessment of the ecological integrity and fish community structures of the uMngeni River, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Pumla Dlamini --- University of KwaZulu-Natal, South Africa Colleen T Downs --- University of KwaZulu-Natal, South Africa Matthew Burnett --- University of KwaZulu-Natal, South Africa Gordon O’Brien --- University of KwaZulu-Natal, South AfricaThe uMngeni River is economically important as it provides water to two of the largest cities in KwaZulu-Natal Province, South Africa. As such, protecting the river and the life within it is also of great importance. In this study, we... -
Quality assessment of groundwater in a crystalline semi-urbanised environment (Lefock watershed, Cameroon)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Lauric Tontsa --- University of Dschang, Cameroon Emile Temgoua --- University of Dschang, Cameroon Obina Chigoziem Akakuru --- Federal University of Technology, Nigeria Hara Toukou --- University of Dschang, Cameroon Guillaume Bertrand --- Univerité de Bourgogne Franche-Comté, France Patrick Lachassagne --- Université de Montpellier, FranceThis study provides an assessment of the hydrogeochemical processes influencing shallow groundwater quality in the Lefock watershed (crystalline area, Cameroon). Seventeen groundwater samples were collected in May 2021 during the rainy season. These samples were analysed for their physical characteristics... -
An assessment of heavy metal accumulation in the Vaal River system, South Africa, using artificial mussels
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JA Calaca --- University of the Witwatersrand, South Africa S Dahms-Verster --- University of the Witwatersrand, South AfricaThis study aims to identify metal concentrations around the Vaal River system by means of spot water sampling and the use of artificial mussels (AMs). Levels of Al, Cd, Co, Cr, Cu, Fe, Mn, Pb and Zn were determined at... -
Assessment of the physico-chemical water quality, distribution and abundance of Macrobrachium species in Okwagbe River, Delta State, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Jerimoth Kesena Ekelemu --- Delta State University, Nigeria Alice Olok Ekwu --- University of Uyo, Nigeria Patrick Adarighofua --- University of Uyo, Nigeria Arnold Ebuka Irabor --- Dennis Osadebay University, NigeriaOkwagbe community, situated along the Okwagbe River, a tributary of River Forcados, is a notable commercial hub recognised for its shrimp harvesting and trade. A study was therefore conducted on this river to determine its water quality, and distribution and... -
The genetic control of early growth properties in Pinus patula × Pinus tecunumanii hybrid families
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JP de Villiers --- Sappi Shaw Research Centre, South Africa A Nel --- Sappi Shaw Research Centre, South Africa B du Toit --- University of Stellenbosch, South AfricaThe objective of this study was to determine the genetic control of growth properties in Pinus patula × Pinus tecunumanii hybrid families across seven sites planted in the summer rainfall region of southern Africa. Genetic material included in the analyses... -
Unveiling Kianda: a multifaceted symbol in Luanda, Angola
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Kyeri Kim --- Hankuk University of Foreign Studies Global Campus, Republic of KoreaThis article explores how Kianda, an (un)official urban symbol of Luanda, the capital of Angola, is rooted in the cosmological worldview of residents of Luanda’s Cabo Island (Ilha do Cabo, also known as Ilha de Luanda) and how it has... -
The behavioural response of an estuarine teleost (Cape stumpnose Rhabdosargus holubi) to angler bait collection in two adjacent Eastern Cape estuaries, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- Rhodes University, South Africa B van Heerden --- Rhodes University, South Africa MW Farthing --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaReports of learned behavioural adaptations of wild Cape stumpnose Rhabdosargus holubi (family Sparidae) were investigated in two estuarine systems in the Eastern Cape Province, South Africa. Underwater observational trials using video cameras demonstrated that fish rapidly responded to bait collection... -
Paclobutrazol application in eucalypt clones promotes morphological changes without affecting the physiological characteristics
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jenifer Nathanna Marcelino Moura --- Universidade Federal do Acre, Brazil Paulo André Trazzi --- Universidade Federal do Acre, Brazil Elsilene Thaynara Melo Sales --- Universidade Federal do Acre, Brazil Marcio Oliveira Martins --- Universidade Federal do Acre, Brazil Keveny da Silva e Silva --- Universidade Federal do Acre, Brazil Gabriel Melo Mustafa --- Universidade Federal do Acre, Brazil Barbara Valentim Oliveira --- Universidade Federal do Acre, BrazilThe aim of this study was to investigate the morphophysiology of young eucalypt clones in response to different water regimes and paclobutrazol (PBZ) concentrations applied to the soil. The experiment was conducted in a greenhouse environment at the Federal University... -
Indigenous knowledge in water resource management in Mtwara region-Ruvuma water basin, Southern Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Evaristo Haulle [cor1] Faraja Sanga --- Ruaha Catholic University, TanzaniaIndigenous knowledge (IK) plays a crucial role in sustainable water resource management, offering valuable insight into local ecosystems, climate patterns, and community practices that have been honed over generations. However, this knowledge is increasingly at risk due to climate change,... -
Physiological traits associated with drought tolerance in Moroccan chickpea
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Meriem Tabouktirt --- University Hassan II, Morocco Fatoumata Farida Traore --- University Hassan II, Morocco Sara Fahde --- , Morocco Ayyoub Ammar --- University Hassan II, Morocco Hasnae Choukri --- , Morocco Said Boughribil --- University Hassan II, MoroccoIn a greenhouse experiment conducted in Mohammedia, drought stress responses were evaluated under two treatments (100% and 50% of field capacity; FC) in six Moroccan chickpea varieties: Arifi, Bouchra, Farihane, Moubarak, Rizki, and Zahour. The susceptibility index (SI) clearly differentiated... -
Macrofauna assemblages and their relationships with environmental parameters in mangroves of Kribi, Cameroon
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Vanessa Maxemilie Ngo-Massou --- High Teacher’s Training College, University of Yaoundé I, Cameroon Ernest Flavien Kottè-Mapoko --- Institute of Fisheries and Aquatic Sciences at Yabassi, The University of Douala, Cameroon Guillaume Léopold Essomè-Koum --- Institute of Fisheries and Aquatic Sciences at Yabassi, The University of Douala, Cameroon Elegbede Isa Olalekan --- Lagos State University, Nigeria Boubakary --- The University of Maroua, Cameroon Laurant Nyamsi-Moussian --- The University of Douala, Cameroon Alphonse Konango-Samè --- The University of Douala, Cameroon Ophman Nsame-Bile --- The University of Douala, Cameroon Wendy Loys Keedi-A-Bougen --- The University of Douala, Cameroon Joseph Lebel Tamesse --- High Teacher’s Training College, University of Yaoundé I, Cameroon Ndongo Din --- The University of Douala, CameroonChanges in composition, abundance and distribution of macrofaunal assemblages are subject to environmental influences. However, the effects of ecological disturbance on mangrove habitats in Cameroon have not been sufficiently studied with regard to macrofaunal assemblages. This work aims to identify... -
Marine–estuarine connectivity, salinity and sedimentation in the St Lucia system, South Africa, following reconnection with the uMfolozi River
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RH Taylor --- Independent Hydro-Ecologist, South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity, South Africa CE Fox --- Ezemvelo KwaZulu-Natal Wildlife, St Lucia Estuary, South Africa JB Adams --- Botany Department and Institute for Coastal & Marine Research, Nelson Mandela University, South AfricaThis study reviews selected physical and biotic responses of the St Lucia estuarine system to the recently implemented management approach of re-establishing the connection between the uMfolozi River and the St Lucia Estuary. This connection was severed in the 1950s... -
Comparing fixed count and observed/expected taxa approaches in diatom-based water quality assessment: implications for monitoring efficiency and accuracy
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Holmes --- Africa Earth Observatory Network (AEON) – Earth Stewardship Science Research Institute (ESSRI), Nelson Mandela University, South Africa JC Taylor --- Unit for Environmental Sciences and Management (UESM), North-West University, South Africa B Linol --- Africa Earth Observatory Network (AEON) – Earth Stewardship Science Research Institute (ESSRI), Nelson Mandela University, South AfricaDiatom-based indices are widely used for freshwater bioassessment, yet methodological variability, particularly in count strategies, can influence ecological classification outcomes. This study compares a traditional fixed count (FC) approach with an observed/expected taxa (OE) strategy across five riverine sites in... -
Comparative study of the occurrence and distribution of parasites in pond and cage-cultured Nile tilapia (Oreochromis niloticus) in the Lake Victoria Crescent, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AN Luttamaguzi --- , Uganda JJ Kisakye --- Makerere University, Uganda T Mudumba --- CAB International, Kenya C Agoe --- National Fisheries Resources Research Institute, National Agricultural Research Organization, Uganda M Sserwadda --- Mountains of the Moon University, Uganda JK Walakira --- National Fisheries Resources Research Institute, National Agricultural Research Organization, UgandaDespite ongoing biosecurity and control efforts, aquaculture intensification in the Lake Victoria Crescent has led to a persistent increase in parasitic disease occurrence in cultured Nile tilapia. Notably, different culture systems provide different habitats and environmental conditions for parasites and...