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Floristic and Structural Composition of Wonderwoud Forest in the Wolkberg, North-Eastern Transvaal
Item type: Journal Article • Journal: South African Forestry Journal • Authors: C.J. Geldenhuys --- Division of Forest Science and Technology, F.J. Pieterse --- Wolkberg Wilderness Area,The closed, evergreen forest of 450 ha was studied by means of a survey of 55 circular plots of 0,04 ha, distributed in a grid pattern. TWINSPAN classification separated the forest into four stand types: Olea capensis macrocarpa—Xymalos monospora—Syzygium gerrardii... -
Floristic and Structural Composition of Hanglip Forest in the Soutpansberg, Northern Transvaal
Item type: Journal Article • Journal: South African Forestry Journal • Authors: C.J. Geldenhuys --- Division of Forest Science and Technology, B. Murray --- Northern Transvaal Forest Region,The closed, evergreen forest of 363 ha was sampled by means of 62 circular plots of 0,04 ha, distributed in a grid pattern. TWINSPAN classification separated the forest into regrowth forest with two forest types, and mature forest with four... -
An evaluation of the economic viability of commercial pastoralism in the smaldeel area of the Eastern Cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture and Water Supply (Eastern Cape Region), J.B. Marais --- Department of Agriculture and Water Supply (Eastern Cape Region),Carrying capacity models and financial data from study group farmers were used to derive attainable net revenue per ha on veld in good, moderate and poor condition. From these data, minimum farm sizes required for a reasonable standard of living... -
The relationship between sward structure, ingestive behaviour and dietary quality in cattle grazing a Chloris gayana pasture
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.J. O'Reagain --- Department of Agricultural Development, Republic of South AfricaThe relationship between sward structure, ingestive behaviour (bite size, biting rate and intake rate) and dietary crude protein (CP) content was studied on a Chloris gayana pasture at different growth stages using oesopha‐geally‐fistulated steers. As the pasture matured, leaf table... -
Influence of rainfall and grazing on the compositional change of the herbaceous layer of a sandveld savanna
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: T.G. O'Connor --- Resource Ecology Group, Department of Botany,The influence of heavy grazing by cattle for three years, and of rainfall interception for one year, on the herbaceous composition of a sandveld savanna in Gazankulu was investigated. The composition and the abundance of the predominant species changed substantially,... -
Patterns of plant selection by grazing cattle in two savanna grasslands: A plant's eye view
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: T.G. O'Connor --- Resource Ecology Group, Department of Botany, Republic of South AfricaThe amount of grazing experienced by individual tufts of the most abundant perennial grasses of two Transvaal savannas was monitored at regular intervals for two growing seasons. In general, Setaria incrassata and Themeda triandra were heavily grazed, Bothriochloa insculpla and... -
The origin of textural lamellae in Quaternary coast sands of Natal
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: L.P. van Reeuwijk --- , The Netherlands J.M. de Villiers --- Department of Soil Science and Agrameteorotogy,A new concept of the formation of textural subsoil lamellae has been developed on the basis of their morphology in aeolian coastal deposits in Natal. It has been concluded that they are initiated somewhere at depth in the profile by... -
The effect of particle-size distribution on the suitability of sandy soils for sports fields
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Nel --- Department of Soil Science, Republic of South AfricaThe compaction of the topsoil layer of sports fields can modify soil properties such as permeability, resistance to root penetration, aeration and water-holding capacity. The feasibility of predicting these properties from particle size distribution parameters of sandy soils was investigated... -
Morphogenesis of Malus domestica cv. Starking flower buds
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- ,Differentiation of reproductive buds of the Starking apple (Malus domestica) was studied by scanning electron microscopy. Differentiation of reproductive structures was initiated during the first week of January when the shoot apex flattened. In terminal flower primordia, sepal primordia were... -
Effect of the previous crop on cortical cell number of Malus domestica cv. Starking Delicious apple flower primordia, flowers and fruit
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- ,The effect of the crop of the previous season on cell size of the cortical region of flower primordia, flowers and fruit size in Starking Delicious apples was investigated. Cell number was monitored from the onset of differentiation of the... -
Opbrengskomponente van koring by verskillende vlakke van grondvrugbaarheid
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Hammes --- Departement Plantproduksie, Republiek van Suid-Afrika J.G. Annandale --- Departement Plantproduksie, Republiek van Suid-Afrika E.A. Beyers --- Departement Plantproduksie, Republiek van Suid-Afrika P.C. Nel --- Departement Plantproduksie, Republiek van Suid-AfrikaIn 'n langtermyn bemestingsproef met koring onder besproeiing het groot verskille in grondvrugbaarheid oor jare ontwikkel, wat ook in groot verskille in graanopbrengs weerspieëf word. Opbrengs en opbrengskomponente was kleiner op persele wat geen P-bemesting ontvang as op persele wat... -
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... -
Enkele faktore wat die vruggroei van sitrus beïnvloed
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.F. du Plessis --- , Republiek van Suid-Afrika H.M. du Plessis --- , Republiek van Suid-Afrika'n Ondersoek het aangetoon dat 'n hoogsbetekenisvolle (r = 0,96) verwantskap bestaan tussen waterverbruik van 'n volwasse sitrusboom en vruggroeitempo. Waterverbruik bereik 'n maksimum van 80–90 l/dag gedurende die periode Desember tot einde Maart, dit is dieselfde tyd wanneer vruggrootte... -
Effect of time of hand-thinning on apple fruit size
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe effect of time of hand-thinning on fruit size of Starking, Starkrimson and Starkspur Golden Delicious was studied during two consecutive seasons. In the first season trees were thinned at weekly or fortnightly intervals, commencing at full bloom until eight... -
Effect of temperature during the first 42 days following full bloom on apple fruit growth and size at harvest
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe relationship between temperature prevailing during the 42-day period following full bloom (42 DFFB) and fruit size at harvest of four apple cultivars was studied for two seasons. Lower temperatures during the first season resulted in smaller fruit whereas higher... -
Proposed regression model for calculating optimum crop levels of apple trees
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe value per ton of Golden Delicious, Granny Smith, Starking and Starkrimson fruit was calculated by assigning values per carton to each of six size groups of fruit harvested from individual trees in experimental orchards during the four seasons 1978/79... -
Invloed van kaliumdraende bemestingstowwe op knolopbrengs en persentasie droëmateriaal van Solanum tuberosum L. knolle
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.G. Bester --- , Republiek van Suid-Afrika P. C.J. Maree --- Departement Akkerbou en Weiding, Republiek van Suid-AfrikaKNO3 het onder beheerde voedings en omgewingstoestande 'n hoër knolopbrengs as KCl en K2SO4 getoon. Alhoewel KCl 'n hoër knolopbrengs as K2SO4 gegee het, was dit net in 1985 oor alle cultivars (cv. BP1, Vanderplank, Up-to-date, Pimpernel) beduidend. KNO3 het... -
Invloed van tyd van ringelering op vruggrootte en rypwording van nektariens
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Hannelie Agenbag --- , Republiek van Suid-AfrikaVoldraende Sunlite nektarienbome is in vyf produksie gebiede op 5, 6, 7, 8 en 9 weke na volblom geringeleer in 'n poging om ringelering se effek op vrugkwaliteit vas te stel. Alle ringeleerbehandelings het skynbaar tot groter vrugte gelei, maar... -
Cumulative effect of time of hand-thinning on fruit size of Golden Delicious and Granny Smith apples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Bergh --- , Republic of South AfricaThe cumulative effect of time of hand-thinning on fruit size of Golden Delicious and Granny Smith apple trees was studied during seven consecutive seasons for Golden Delicious and four consecutive seasons for Granny Smith. Trees were thinned to single flowers... -
An inexpensive, portable rain simulator: construction and test data
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. Claassens --- Department of Soil Science and Plant Nutrition, Republic of South Africa H. v.H. van der Watt --- Department of Soil Science and Plant Nutrition, Republic of South AfricaConstruction details of an inexpensive, portable rain simulator are given. The dismountable components are easily transported on a light truck. The flat spray nozzles used produced rain with a >90% coefficient of uniformity over a 1-m2 test plot. Drop sizes... -
Die sif van sonneblomsaad vir die verbetering van olie- en proteienherwinning
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.A. Nel --- , Republiek van Suid-Afrika H.L. Loubser --- , Republiek van Suid-Afrika P.S. Hammes --- Departement Plantproduksie en Grondkunde, Republiek van Suid-AfrikaVoor die olie van sonneblomsaad (Helianthus annuus L.) uitgepers word, word dit ontdop om onder andere die kwaliteit van die oliekoek so hoog moontlik te kry. Dopbaarheid, of die gemak van ontdopping, het 'n positiewe verwantskap met saadgrootte. Aangesien saadmonsters... -
Deriving a grain hardness calibration for Southern and Western Cape ground wheat samples by means of the particle size index (PSI) method and Fourier transform near infrared (FT-NIR) spectroscopy
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Manley --- Department of Food Science, Republic of South Africa L. van Zyl --- Department of Food Science, Republic of South Africa B.G. Osborne --- , AustraliaThe bread wheat hardness scenario among the Southern and Western Cape cultivars was investigated by deriving a FT-NIR hardness calibration for 198 ground bread wheat samples and using the particle size index (PSI) test as referencê method. Particle size index... -
Effects of nutrient regime on bulb yield and plant quality of Lachenalia Jacq. (Hyacinthaceae)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F. Roodbol --- , South Africa E. Louw --- , South Africa J.G. Niederwieser --- , South AfricaThe effects of different nutrient regimes on the Lachenalia cvs ‘Romelia’ and ‘Namakwa’ were studied over two successive seasons. The basic formulation of the Commisie Glastuinbouw (1992), viz 0.37 g KNO3 + 0.36 g Ca(NO3)2 + 0.06 g MgS04 +... -
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... -
The effect of rootstock cultivar on the yield and fruit quality of ‘Packham's Triumph’, ‘Doyenne du Comice’, ‘Forelle’, ‘Flamingo’ and ‘Rosemarie’ pears
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.N. Jacobs --- Department of Horticultural Science, South Africa N.C. Cook --- Department of Horticultural Science, South AfricaProduction data and questionnaire results concerning the long-term effects of various rootstocks on pear (Pyrus communis L.) yield indicated that BP1 and BP3 are currently the preferred rootstocks in the South African industry. Yield records of ‘Packham's Triumph’ pears indicated... -
Effect of blossom stage of ‘Alpine’ nectarine on efficacy of chemical thinning using Armothin
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.S. North --- Division of Horticulture, South Africa M. Booyse --- Biometry Unit, South AfricaFruit thinning of peach and nectarine cultivars is essential to maximize profitability and stabilize production and is routinely done by hand thinning of blossoms and early fruit. Chemical thinning of blossoms may reduce the cost of manual labour, but results... -
Effect of pruning on yield and quality of hydroponically grown cherry tomato (Lycopersicon esculentum)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. M. Maboko --- , South Africa C. P. du Plooy --- , South AfricaThe commercial importance of cherry tomatoes is continuously increasing in the South African retail market, with fruit size playing an important role. The effect of pruning on yield and quality of two cherry tomato cultivars (Naomi and Josefina) with an... -
Relationships between soil particle size fractions and infiltrability
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.V. Medinski --- Department of Soil Science, South Africa A.J. Mills --- Department of Soil Science, South Africa M.V. Fey --- , Western AustraliaThe influence of particle size fractions on infiltrability was investigated in soils sampled across Namibia and western South Africa. Infiltrability was determined using a laboratory technique calibrated with rainfall simulation, which measures the passage of a suspension of soil particles... -
Infiltrability in soils from south-western Africa: effects of texture, electrical conductivity and exchangeable sodium percentage
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: T.V. Medinski --- Department of Soil Science, South Africa A.J. Mills --- Department of Soil Science, South Africa M.V. Fey --- , Western AustraliaThe effects of particle size, electrical conductivity (EC) and exchangeable sodium percentage (ESP) on infiltra-bility were investigated in 35 soils from Namibia and western South Africa. Samples were grouped as follows: sand (5–9% clay + silt), loamy sand (16–20%) and... -
Development of Phakopsora pachyrhizi on soybean at controlled temperature, relative humidity and moisture periods
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Nunkumar --- , South Africa P.M. Caldwell --- , South Africa Z.A. Pretorius --- Department of Plant Sciences, South AfricaThe influence of temperature, relative humidity (RH) and moisture period (MP) was studied in relation to infection of soybean plants (Glycine max (L.) Merr.) by Asian Soybean Rust (ASR) caused by Phakopsora pachyrhizi Syd. Disease development was investigated at 15,... -
Sampling variation in the quantification of fumonisins in maize samples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. Janse van Rensburg --- , South Africa B.C. Flett --- , South Africa N.W. Mc Laren --- Department of Plant Sciences, 9300 South Africa A.H. Mc Donald --- ,Fumonisins produced by F. verticillioides and F. proliferatum cause mycotoxicoses in horses, swine and rats and have been associated with oesophageal cancer in humans. Accurate measurement of mycotoxins is essential for determining the safety of grain and their products for... -
Influence of mono- and biculture cover cropping systems on soil polysaccharides and aggregate stability 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 AfricaMono- and biculture cropping systems are thought to affect aggregate stability by influencing soil polysaccharides but the exact relationship is uncertain. The objective of this study was to determine the effects of cover cropping systems on polysaccharides and aggregate stability... -
The efficacy of 6-benzyladenine, gibberellins4+7 and prohexadione-calcium to increase fruit size in ‘Forelle’ and ‘Abate Fetel’ pear
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Carlien Dreyer --- Department of Horticultural Science, South Africa Karen I Theron --- Department of Horticultural Science, South AfricaFruit size is an important marketing and quality parameter and has a significant effect on the economic value of fruit. The application of synthetic cytokinins are believed to enhance fruit size by stimulating and extending the cell division stage in... -
On the dynamics of demersal fish assemblages off Namibia in the 1990s
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: G. Bianchi H. Hamukuaya O. AlvheimDemersal fish surveys carried out off Namibia from 1990 to 2000 were used to study the dynamics of demersal fish assemblages on the shelf and upper slope. The study was performed on each major assemblage, i.e. over the shelf (100–300... -
Life history of white stumpnose Rhabdosargus globiceps (Pisces: Sparidae) off South Africa
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: M. H. Griffiths C. Wilke A. J. Penney Y. MeloFishery-dependent and fishery-independent distribution analyses together reveal four discrete areas of white stumpnose Rhabdosargus globiceps abundance between Port Nolloth and the Kei River off the Cape Province of South Africa: the Western Cape (Saldanha Bay), the South-Western Cape, the Southern... -
Some observations on the reproductive biology of The sixgill shark Hexanchus griseus (Bonnaterre, 1788) from southern African waters
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: D. A. EbertObservations are made of the maturation status of 81 male and 88 female sixgill sharks Hexanchus griseus from southern African waters. Males mature at about 310 cm total length (TL) with the calcification of the terminal cartilage elements of the... -
DISTINGUISHING SUB-ENVIRONMENTS OF SEDIMENT DEPOSITION IN RESERVOIRS USING PARTICLE SIZE DISTRIBUTION PARAMETERS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: A van B Weaver --- Department of Water Affairs, South Africa AW Stone --- Department of Water Affairs, South AfricaThe deposition of sediment and the distribution of sediment sizes in impoundments is related to the hydraulic mechanisms of the lacustrine or reservoir environment. Granulometric parameters of sediments can be particularly sensitive indicators of the hydraulic environments occuring in different... -
DEVELOPMENT AND USE OF ZOOPLANKTON LENGTH - FILTRATION RATE RELATIONSHIPS FOR ESTIMATING PHYTOPLANKTON GRAZING LOSSES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: AndrewC. Jarvis --- ,Water quality is impaired by high chlorophyll concentrations. Limitation of algal stocks by high zooplankton grazing is an important component in many lake ecosystems and models. Measurement of grazing rates is labour intensive, expensive and requires specialized skills. This paper... -
Sampling efficiency for species composition assessments using the wheel-point method in a semi-arid savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: BH BrockettA pilot survey to determine the sampling efficiency of the wheel-point method, using the nearest plant method, to assess species composition (using replicate similarity related to sampling intensity, and total sampling time) was conducted on three plot sizes (20 ×... -
A contiguous-quadrat sampling exercise in a shrub-invaded grassland patch: size matters but biggest is not best
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J Goodall P Zacharias T Olckers T EdwardsWe attempted to ascertain the most effective sample size for monitoring serial changes in the herbaceous layer of fragmented and neglected grasslands that are responding to annual veld burning. We conducted a sampling exercise in a coastal grassland invaded by... -
Forage–sheep relationships in communally managed moist thornveld in Zululand, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: CC Nyamukanza --- Department of Agriculture, South Africa PF Scogings --- Department of Agriculture, South Africa KR Mbatha --- Department of Agriculture, South Africa NW Kunene --- Department of Agriculture, South AfricaCommunal rangelands have a wide range of vegetation communities that sustain livestock. Limited information exists on forage availability and quality in communal areas and how it influences Nguni sheep foraging behaviour. A study spanning almost three years was conducted to... -
Investigation of the potential ingestion rates of different sourveld grasses by cattle and sheep
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: P.J. O'Reagain --- , Republic of South Africa B.C. Goetsch --- , Republic of South AfricaQuantification of the potential ingestion rates of different grasses is important for modelling purposes but is difficult to achieve under field conditions. The ingestion rates of the sourveld species Alloteropsis semialata, Andropogon appendiculatus, Cynodon dactylon, Eragrostis plana, Heteropogon contortus, Hyparrhenia... -
Estimating sample size for a small‐quadrat method of botanical survey for application in mixed Bushveld
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: W.G. Dörgeloh --- Applied Natural Sciences, Republic of South AfricaSpecies density and grass density were measured using a small‐quadrat method in eight plant communities in the Nylsvley Nature Reserve, South Africa. The presence of new species in each additional quadrat was used to calculate sample size. A sample size... -
Precision and accuracy of sward height distributions
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C.D. Morris P.J.K. Zacharias J.F. DerryDouble normal distributions can be used to resolve many sward height frequency distributions into two components representing the 'short' (patches) and 'tall' (non∼patches) areas in the sward. The effect of sample size on the precision and accuracy of parameters of... -
An assessment of factors affecting early survival and growth of Pinus patula and Pinus elliottii in the summer rainfall region of southern Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: C. A. Rolando K. M. LittleHigh initial mortality of pine seedlings planted in commercial timber plantations in the summer rainfall region of southern Africa has motivated research into possible causes. The objectives of this study were to assess whether survival and initial growth of Pinus... -
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 effect of feeding regimen on growth, food conversion ratio and size variation in juvenile dusky kob Argyrosomus japonicus (Teleostei: Sciaenidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Kaiser --- Department of Ichthyology and Fisheries Science, South Africa PD Collett --- Department of Ichthyology and Fisheries Science, South Africa NG Vine --- Department of Ichthyology and Fisheries Science, South AfricaTemperature, feeding frequency and feeding intensity are important determinants of fish growth in aquaculture. As part of a research and development programme to optimise husbandry techniques for a new mariculture species, the dusky kob, Argyrosomus japonicus, this study tested the... -
The breeding biology of the southern barred minnow Opsaridium peringueyi (Gilchrist and Thompson 1913) in the Incomati and Luvuvhu river systems, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSO Fouché --- Zoology Department, South Africa JA Venter --- School of Biological and Conservation Sciences, South AfricaData collected at two sites in the Luvuvhu and Sabie rivers show that, based on the gonadosomatic index, Opsaridium peringueyi has one major annual breeding event that occurs in early summer, following a period during which the general condition of... -
Population structure and reproductive biology of Schilbe intermedius (Teleostei: Schilbeidae) in the Pendjari River, Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Ahouansou Montcho --- , A Chikou --- , PA Lalèyè --- , KE Linsenmair --- , GermanyThis study, the first on fish reproduction in the Pendjari River, investigated aspects of the reproductive biology of Schilbe intermedius. A total of 429 females and 239 males were collected from March 2007 to February 2008. Females were larger than... -
Ostrich recruitment dynamics in relation to rainfall in the Mara–Serengeti ecosystem
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: JosephO Ogutu --- Institute of Crop Science, Germany Hans-Peter Piepho --- Institute of Crop Science, Germany HollyT Dublin --- Species Survival Commission, International Union for Conservation of Nature and Natural Resources, c/o Centre for Biodiversity Conservation, South AfricaAnimal population dynamics can be driven by rainfall variability through its influence on habitat suitability, availability and nutritional sufficiency of forage. To understand how rainfall influences ostriches, we related changes in ostrich recruitment in the Mara–Serengeti ecosystem to rainfall. Over... -
Territory size and habitat selection of Cinnamon-breasted Rock Bunting Emberiza tahapisi in Nigeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: FidelisA Atuo --- AP Leventis Ornithological Research Institute, Nigeria ShiiwuaA Manu --- AP Leventis Ornithological Research Institute, NigeriaMost of our understanding of territorial behaviour in birds comes from studies of temperate species. Territoriality and factors influencing territory size of tropical birds are still poorly studied. In this study, 11 territories of the Cinnamon-breasted Rock Bunting Emberiza tahapisi... -
Supernormal clutches in southern African Kelp Gulls Larus dominicanus vetula
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: PeterG Ryan --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute, South Africa BruceM Dyer --- Department of Environment Affairs, South Africa A Paul Martin --- Department of Zoology, South Africa VincentL Ward --- Department of Biodiversity and Conservation Biology, South Africa PhilA Whittington --- Department of Zoology, South Africa AnthonyJ Williams --- , South AfricaThe Kelp Gull Larus dominicanus typically lays clutches of 1–3 eggs, but larger clutches have been recorded occasionally. We report that four- and five-egg clutches comprise 0.3% of clutches among the southern African subspecies L. d. vetula, with a higher... -
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 -
DEVELOPMENT AND USE OF ZOOPLANKTON LENGTH—FILTRATION RATE RELATIONSHIPS FOR ESTIMATING PHYTOPLANKTON GRAZING LOSSES
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: AndrewC. Jarvis --- ,Water quality is impaired by high chlorophyll concentrations. Limitation of algal stocks by high zooplankton grazing is an important component in many lake ecosystems and models. Measurement of grazing rates is labour intensive, expensive and requires specialized skills. This paper... -
LIMNOLOGICAL SOCIETY OF SOUTHERN AFRICA 25th ANNIVERSARY CONGRESS
Item type: Journal Article • Journal: Southern African Journal of Child and Adolescent Mental Health • Authors: -
Observations on the Ecology of Pleurobrachia Pileus (Ctenophora) in the Southern Benguela Ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M. J. Gibbons E. Buecher D. Thibault-BothaThe vertical distribution, abundance and size composition of a population of Pleurobrachia pileus was studied during a six-day drogue study conducted off the west coast of South Africa in February 1995. The population was centred in deep water, possibly because... -
Spatial Variability in the Mudprawn Upogebia Africana on the South-east Coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: O. Dubula T. A. LasiakA nested sampling design was used to examine the variability in density, biomass, sex ratio and size of the estuarine mudprawn Upogebia africana in six estuaries on the south-east coast of South Africa. The objectives were to test the general... -
Populations of Surface-nesting Seabirds at Marion Island, 1994/95–2002/03
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R. J. M. Crawford J. Cooper B. M. Dyer M. D. Greyling N. T. W. Klages P. G. Ryan S. L. Petersen L. G. Underhill L. Upfold W. Wilkinson M. S. De Villiers S. Du Plessis M. Du Toit T. M. Leshoro A. B. Makhado M. S. Mason D. Merkle D. Tshingana V. L. Ward P. A. WhittingtonDuring the 1990s and early 2000s, populations of surface-nesting seabirds at Marion Island showed different trends, but for the majority of species numbers decreased. Reduced numbers of gentoo penguins Pygoscelis papua, eastern rockhopper penguins Eudyptes chrysocome filholi, Crozet shags Phalacrocorax... -
Effects of fishing on the size and dominance structure of linefish of the Cape region, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D. Yemane J. G. Field M. H. GriffithsA dataset of linefish catch, effort and fish size distribution records has been assembled from archives to cover three short periods over the 100 years from 1897 to 1998 in four regions of the former Cape Colony, South Africa. Linefish... -
Comparison of fish-community size spectra based on length frequencies and mean lengths: a note
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Yemane MH Griffiths JG FieldEstimates of fish-community size spectra are promising indicators of the impact of fishing on fish assemblages. Size spectra consist of logarithmic graphs of abundance plotted against fish body size. Size spectra may either be constructed from length frequency data or... -
Stock separation and life history of Argyrozona argyrozona (Pisces: Sparidae) on the South African east coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Brouwer MH GriffithsFishery independent biomass surveys and commercial linefish catch returns were used to elucidate the spatial patterns of carpenter Argyrozona argyrozona distributed along the South African continental shelf. Two distinct areas of abundan ce ere determined, one on the central and... -
Management of Argyrozona argyrozona (Pisces: Sparidae) in South Africa based on per-recruit models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Brouwer MH GriffithsCarpenter Argyrozona argyrozona is an endemic sparid that constitutes an important component of the South African linefishery between Cape Agulhas and Port Alfred, where it exists as two stocks; one on the central Agulhas Bank and the other on the... -
Settlement patterns, size and growth of puerulus and juvenile rock lobster Jasus lalandii at an oyster farm in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Groeneveld --- , South Africa CL Greengrass --- Marine Biology Research Institute, Department of Zoology, South Africa DL van Zyl --- Branch Fisheries, Department of Agriculture, Forestry and Fisheries, South Africa GM Branch --- Marine Biology Research Institute, Department of Zoology, South AfricaTrends in the abundance, size and growth of newly settled pueruli and early juveniles of the rock lobster Jasus lalandii were determined from samples obtained from mesh bags used for oyster mariculture in Saldanha Bay, South Africa. Totals of 3... -
The dispersion of red knots Calidris canutus in Africa—is southern Africa a buffer for West Africa?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RW Summers --- , UK LG Underhill --- Animal Demography Unit, Department of Zoology, South Africa M Waltner --- , UKThe Siberian subspecies of the red knot Calidris canutus canutus spends the non-breeding season largely in West Africa (Mauritania and Guinea Bissau), where approximately half a million occurred in the 1980s. It was a rarely seen in southern Africa in... -
The November 2011 irruption of buoy barnacles Dosima fascicularis in the Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PG Ryan --- Percy FitzPatrick Institute of African Ornithology, DST/NRF Centre of Excellence, South Africa GM Branch --- Marine Research Institute, Department of Zoology, South AfricaNovember 2011 saw an unprecedented irruption of buoy barnacles Dosima fascicularis in coastal waters off the Western Cape, South Africa. Buoy barnacles not uncommonly strand in the region attached to feathers, plastic litter and other small objects, but the 2011... -
Patterns of endemicity and range restriction among southern African coastal marine invertebrates
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RJ Scott --- Marine Biology Research Centre, Zoology Department, South Africa CL Griffiths --- Marine Biology Research Centre, Zoology Department, South Africa TB Robinson --- Department of Botany and Zoology, South AfricaSouthern Africa supports a rich marine biota of 12 734 currently described marine species. Although the distribution and overall species-richness patterns of several component taxa are well documented, studies considering range sizes are absent. This study considers range size frequencies... -
Can anchovy age structure be estimated from length distribution data collected during surveys?
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C L de Moor --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa D S Butterworth --- Marine Resource Assessment and Management Group (MARAM), Department of Mathematics and Applied Mathematics, South Africa J C Coetzee --- Branch Fisheries Management, Department of Agriculture, South AfricaHistorically, a time-series of proportions-at-age 1 from annual November hydro-acoustic surveys has been used to inform the assessment of, and in particular the choice of appropriate values for juvenile and adult natural mortality for, the South African anchovy Engraulis encrasicolus... -
Changes in population structure of the white grouper Epinephelus aeneus as a result of long-term overexploitation in Senegalese waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: W Ndiaye --- Institut Fondamental d'Afrique Noire-Cheikh Anta Diop [IFAN-CH. A. Diop], Laboratoire de Biologie et d'Ecologie des Poissons en Afrique de l'Ouest [LABEP-AO], Senegal M Thiaw --- Centre de Recherches Océanographiques de Dakar-Thiaroye [CRODT], Senegal K Diouf --- Institut Fondamental d'Afrique Noire-Cheikh Anta Diop [IFAN-CH. A. Diop], Laboratoire de Biologie et d'Ecologie des Poissons en Afrique de l'Ouest [LABEP-AO], Senegal P Ndiaye --- Institut Fondamental d'Afrique Noire-Cheikh Anta Diop [IFAN-CH. A. Diop], Laboratoire de Biologie et d'Ecologie des Poissons en Afrique de l'Ouest [LABEP-AO], Senegal OT Thiaw --- Graduate Institute of Fisheries and Aquaculture [IUPA], Senegal J Panfili --- Institut de recherche pour le développement [IRD], UMR 5119 Ecologie des systèmes marins côtiers [ECOSYM], SenegalIn Senegal, a significant decrease in catches indicates that many demersal fish stocks are being overexploited. The white grouper Epinephelus aeneus, locally known as the ‘thiof’, is exploited by both small-scale and industrial fisheries. A 28-year database of E. aeneus... -
Bottlenose dolphin Tursiops truncatus at São Tomé Island (São Tomé and Príncipe) — relative abundance, site fidelity and social structure
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Pereira --- Escola de Mar, Portugal F Martinho --- Escola de Mar, Portugal C Brito --- Escola de Mar, Portugal I Carvalho --- Escola de Mar, PortugalAlthough the bottlenose dolphin Tursiops truncatus is one of the most common cetacean species around São Tomé Island, Gulf of Guinea, little research has focused on this species in this region. This study investigated the population of bottlenose dolphins around... -
Patterns in abundance, population structure and biology of knife prawn Haliporoides triarthrus on deep-water trawl grounds off eastern South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Robey --- Oceanographic Research Institute, South Africa ST Fennessy --- Oceanographic Research Institute, South Africa BI Everett --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fisheries Science, Norway JC Groeneveld --- Oceanographic Research Institute, South AfricaThe deep-water trawl fishery along the KwaZulu-Natal coast of South Africa targets several crustacean species, with the knife (or pink) prawn Haliporoides triarthrus contributing most of the catch. Logbook data of fishing effort and catch between 1988 and 2010 were... -
Cannibalistic interactions of juvenile mud crabs Scylla serrata: the effect of shelter and crab size
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: OD Mirera --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya P-O Moksnes --- University of Gothenburg, SwedenIn the culture of mud crab Scylla serrata, cannibalism is often the greatest cause of mortality. A laboratory study was conducted to compare the influence of size class differences and shelter on cannibalism and limb loss in juvenile mud crabs... -
The effects of ontogenetic maturation in Pinus patula - Part 1: nursery performance
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: R. G. Mitchell --- Sappi Forests Research, Africa J. Zwolinski --- Forestry Programme, Africa N. B. Jones --- Sappi Forests Research, AfricaThe age at which parent or donor hedges reach ontogenetic maturity has frequently been cited as a debilitating factor in the production of conifer cuttings. This point varies between species and prevailing environmental conditions. Among other things, a lack of... -
The effect of anthropogenic disturbances on population structure and regeneration of Scorodophloeus fischeri and Manilkara sulcata in coastal forests of Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: C Mligo --- Department of Botany, Tanzania HVM Lyaruu --- Department of Botany, Tanzania HJ Ndangalasi --- Department of Botany, TanzaniaScorodophloeus fischeri (Fabaceae, subfamily Caesalpinoideae) and Manilkara sulcata (Sapotaceae) are examples of tropical African hardwood species and are endemic to East African coastal forests. These plant species are threatened by human activities beyond natural recovery in some forests. This study... -
Final results from a trial to test the effect of plot size on Eucalyptus hybrid clonal ranking in coastal Zululand, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: TK Stanger --- , South Africa GM Galloway --- Shaw Research Centre, South Africa ECL Retief --- Shaw Research Centre, South AfricaHybrid clones with Eucalyptus grandis as one parent and, generally, E. urophylla as the other parent, are deployed commercially as monoclonal blocks by Sappi in the subtropical region of coastal Zululand, South Africa. In monoclonal blocks genotypes are grown in... -
A model to predict productivity of different chipping operations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MohammadR Ghaffariyan --- , Australia Raffaele Spinelli --- , Italy Mark Brown --- , AustraliaThe chipping operation is an important component of harvesting systems producing biomass and pulp chips. This paper aimed to develop a valid model to predict the productivity of chipping as part of these operations. Over a number of years more... -
Nature and pattern of lagoon fisheries resource utilisation and their implications for waterbird management in coastal Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: F Gbogbo W Oduro SK OppongSeasonal patterns in human fisheries resource utilisation and the capture characteristics of fish, swimming crabs and land crabs harvested from four coastal lagoons in Ghana between September 2005 and August 2007 are described. These are discussed in relation to sustainable... -
The breeding period of the ocellated spiny eel Mastacembelus vanderwaali (Teleostei: Mastacembelidae) in the Batoka Gorge, Zambezi River
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JL MinshullIn late October 1990, Mastacembelus vanderwaali was found to be breeding in the Zambezi River in the Batoka Gorge in protected areas along a rocky shoreline during the low water period prior to the start of the November rains. Two... -
Phylogeographic structure of the caridean shrimp Palaemon peringueyi in South Africa: further evidence for intraspecific genetic units associated with marine biogeographic provinces
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PR Teske PW Froneman NP Barker CD McQuaidRecent genetic studies have shown that most widely distributed, passively dispersing invertebrates in southern Africa have regional intraspecific units that are associated with the three main marine biogeographic provinces (cool-temperate, warm-temperate and subtropical). The caridean shrimp Palaemon peringueyi also occurs... -
Comparative ecology of the copepods Calanoides carinatus and Calanus agulhensis — the influence of temperature and food
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JA Huggett AJ Richardson JG FieldHypotheses regarding temperature, food abundance and food size were tested to explore niche separation between Calanoides carinatus, an abundant copepod in the cool and food-rich southern Benguela upwelling system, and Calanus agulhensis, the dominant copepod on the warmer, relatively food-poor... -
Population structure and growth of polydorid polychaetes that infest cultured abalone Haliotis midae
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Simon AJ BoothPolydorid polychaetes can infest cultured abalone thereby reducing productivity. In order to effectively control these pests, their reproductive biology must be understood. The population dynamics and reproduction of polydorids infesting abalone Haliotis midae from two farms in South Africa is... -
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... -
Recent population estimates and trends in numbers of albatrosses and giant petrels breeding at the sub-Antarctic Prince Edward Islands
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PG Ryan --- , South Africa MGW Jones --- , South Africa BM Dyer --- Department of Environmental Affairs, South Africa L Upfold --- Department of Environmental Affairs, South Africa RJM Crawford --- Department of Environmental Affairs, South AfricaThe second mid-summer survey of surface-nesting seabirds at the Prince Edward Island group (Marion and Prince Edward islands) was conducted during December 2008, seven years after the initial mid-summer survey. Wandering albatrosses Diomedea exulans may have decreased slightly at Prince... -
Recent trends in numbers of four species of penguins at the Prince Edward Islands
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RJM Crawford --- Department of Environmental Affairs, South Africa PA Whittington --- , South Africa L Upfold --- Department of Environmental Affairs, South Africa PG Ryan --- , South Africa SL Petersen --- , South Africa BM Dyer --- Department of Environmental Affairs, South Africa J Cooper --- Animal Demography Unit, Department of Zoology, South AfricaFour species of penguin breed regularly at South Africa's Prince Edward Islands: king penguin Aptenodytes patagonicus, gentoo penguin Pygoscelis papua, macaroni penguin Eudyptes chrysolophus and southern rockhopper penguin E. chrysocome. In December 2008, it was estimated that some 65 000... -
A tale of two islands: contrasting fortunes for Subantarctic skuas at the Prince Edward Islands
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PG Ryan --- , South Africa PA Whittington --- , South Africa RJM Crawford --- Department of Environmental Affairs, South AfricaSubantarctic skuas Catharacta antarctica are key predators of burrowing petrels at sub-Antarctic islands, and can be used to monitor the health of burrowing petrel populations. A survey of skuas at the Prince Edward Islands was conducted during December 2008, repeating... -
Growth responses of Eucalyptus globulus and E. nitens to pruning and fertiliser treatments in a plantation managed for solid-wood products
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: D Wiseman E Pinkard T Wardlaw C Mohammed M Hall C BeadleThe responses of Eucalyptus globulus and E. nitens to pruning (removal of 0 or 60% of the green crown depth) in two lifts and nitrogen (N) fertiliser application (0 [N0], 100 [N1], 300 [N3] and 500 [N5] kg N ha–1)... -
Modelling dimensional growth of three street tree species in the urban forest of the City of Tshwane, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: GH Stoffberg --- Department of Plant Science, South Africa MW van Rooyen --- Department of Plant Science, South Africa MJ van der Linde --- Department of Statistics, South Africa HT Groeneveld --- Department of Statistics, South AfricaTree height, crown height, crown diameter and stem diameter were measured for 282 trees of the indigenous species Combretum erythrophyllum, Searsia lancea and S. pendulina. Growth relationships were modelled using age as explanatory variable for stem diameter and subsequently stem... -
The importance of anthropogenic effects in habitat use and territory size of Northern Anteater-chats Myrmecocichla aethiops near Amurum Forest Reserve, Jos-Plateau, Nigeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Biplang G Yadok --- AP Leventis Ornithological Research Institute, Nigeria Yahkat Barshep --- AP Leventis Ornithological Research Institute, Nigeria Will Cresswell --- AP Leventis Ornithological Research Institute, NigeriaOccurrence of animals in an area and the size of territories they occupy is a function of resource availability and the environmental conditions in that area. Territory location in birds is often determined by availability of nesting habitat and we... -
Teachability of collocations: The role of word frequency counts
Item type: Journal Article • Journal: Southern African Linguistics and Applied Language Studies • Authors: Déogratias Nizonkiza --- School of Languages, Potchefstroom Campus, Kris Van de Poel --- School of Languages, Potchefstroom Campus,This study aims to gain insights into which collocations to teach at which proficiency levels by answering the following questions: (i) Of the Verb+Noun and Adjective+Noun types of collocations, which one is more difficult (and should therefore come at a... -
Estimation of size at first maturity in two South African coral species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PH Montoya-Maya --- Oceanographic Research Institute, Marine Parade, South Africa AHH Macdonald --- School of Life Sciences, South Africa MH Schleyer --- Oceanographic Research Institute, Marine Parade, South AfricaThe corals Acropora austera and Platygyra daedalea have been the subject of extensive reproductive and population genetic studies in the iSimangaliso Wetland Park (iSimangaliso), on the KwaZulu-Natal coast, eastern South Africa. Despite this, estimates of size at first maturity in... -
Chemical thinning of ‘Barouni’ and ‘Manzanilla’ olives with naphthalene acetic acid under South African conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J Jacques Crous --- Department of Horticultural Science, South Africa Willem J Steyn --- Department of Horticultural Science, South AfricaTable olives grown in the Mediterranean-type climate of Western Cape province of South Africa are prone to alternate bearing, as elsewhere in the world. To date, South African producers have tolerated the negative effects of alternate bearing, but due to... -
Predation by introduced largemouth bass Micropterus salmoides on indigenous marine fish in the lower Kowie River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ML Magoro --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa L Carassou --- Department of Zoology and Entomology, South AfricaThe predatory impact of introduced largemouth bass Micropterus salmoides on the juveniles of estuary-associated indigenous marine fish species in the lower Kowie River and estuary headwaters was investigated in 2012–2013. Stomach contents and stable isotope analyses were employed to assess... -
Population dynamics and biology of an invasive population of mosquitofish Gambusia affinis in a temperate estuarine lake system
Item type: Journal Article • Journal: African Zoology • Authors: Hans Sloterdijk --- Leibniz Center for Tropical Marine Ecology, Germany Nicola C James --- South African Institute for Aquatic Biodiversity, South Africa M Kyle S Smith --- South African National Parks, Rondevlei Scientific Services, South Africa Werner Ekau --- Leibniz Center for Tropical Marine Ecology, Germany Olaf LF Weyl --- South African Institute for Aquatic Biodiversity, South AfricaThis study investigates the distribution, relative abundance, population growth and biology of the alien invasive fish Gambusia affinis in the Wilderness Lakes System, a coastal lake system in the warm-temperate region of South Africa. Fish were collected throughout the system... -
Aseasonal reproduction in the Hottentot golden mole, Amblysomus hottentotus (Afrosoricida: Chrysochloridae) from KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: S. Schoeman --- Department of Zoology and Entomology, South Africa N. C. Bennett --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M. van der Merwe --- Mammal Research Institute, Department of Zoology and Entomology, South Africa A. S. Schoeman --- Department of Zoology and Entomology, South AfricaThe Hottentot golden mole, Amblysomus hottentotus, is a subterranean mammal that exhibits aseasonal breeding. Reproductive organs of golden moles that had been killed on a monthly basis over a period of one year were examined. Reproductive tract measurements and body... -
Sexual size dimorphism in montane cordylid lizards: a case study of the dwarf crag lizard, Pseudocordylus nebulosus
Item type: Journal Article • Journal: African Zoology • Authors: Eloise Costandius --- Department of Botany & Zoology, South Africa P. le Fras N. Mouton --- Department of Botany & Zoology, South AfricaThe aim of this study was to provide information on sexual size dimorphism (SSD) in Pseudocordylus nebulosus and to discuss the observed variation in SSD among montane cordylids. Data for P. nebulosus were recorded in the Landdroskop area in the... -
Ecology of Wahlberg’s velvet gecko, Homopholis wahlbergii, in southern Africa
Item type: Journal Article • Journal: African Zoology • Authors: Martin J. Whiting --- School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, South Africa Leeann T. Reaney --- School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, South Africa J. Scott Keogh --- School of Botany and Zoology, The Australian National University, AustraliaWe examined 170 museum specimens of the southern African gekkonid lizard Homopholis wahlbergii, to quantify sexual dimorphism, male and female reproductive cycles and diet. The largest male and female we recorded were 116 and 119 mm snout–vent length (SVL) respectively... -
Morphological characteristics of Cape sugarbirds (Promerops cafer) from Helderberg Nature Reserve
Item type: Journal Article • Journal: African Zoology • Authors: K. M. C. Tjørve --- Zoology Department, South Africa G. Scholtz --- , South AfricaCape sugarbirds (Promerops cafer) are the largest nectarivores in the Western Cape and feed almost exclusively on protea nectar and associated arthropods. Helderberg Nature Reserve, Western Cape, South Africa, has a large diversity of Protea and supports breeding sugarbirds. As... -
Intraspecific host preferences of mopane moths (Imbrasia belina) in mopane (Colophospermum mopane) woodland
Item type: Journal Article • Journal: African Zoology • Authors: Halszka Hrabar --- Department of Zoology and Entomology, South Africa Dawood Hattas --- Department of Botany, South Africa Johan T. du Toit --- Department of Zoology and Entomology, South AfricaColophospermum mopane trees are a common larval food plant of the mopane moth (Imbrasia belina),which commonly reaches outbreak proportions. Our study investigated factors determining host tree choice by ovipositing mopane moths within a single host species (C. mopane). Tree size... -
Field evidence for colony size and aseasonality of breeding and in Ansell’s mole-rat, Fukomys anselli (Rodentia: Bathyergidae)
Item type: Journal Article • Journal: African Zoology • Authors: A.M. Sichilima --- Mammal Research Institute, Department of Zoology and Entomology, South Africa N.C. Bennett --- Mammal Research Institute, Department of Zoology and Entomology, South Africa C.G. Faulkes --- School of Biological and Chemical Sciences, Queen Mary, University of London, U.K.Ansell’s mole-rat, Fukomys anselli, is a cooperatively breeding bathyergid endemic to the Lusaka Province of Zambia. During a 12-month field study involving the capture of 33 colonies of mole-rats, the number of occupants, breeding females and sex ratio within colonies... -
Interspecific variation in the distribution of ungulates relative to human infrastructure surrounding Amboseli National Park
Item type: Journal Article • Journal: African Zoology • Authors: Marian Howe --- Department of Biology, Vassar College, U.S.A. Moses M. Okello --- The School for Field Studies, Center for Wildlife Management Studies, Kenya Jeremy M. Davis --- Department of Biology, Vassar College, U.S.A.The presence of humans and man-made structures may cause increased wariness in wildlife, causing displacement from traditional habitat ranges. Potential species differences in such responses could affect the composition of wildlife communities around human settlements. We examined the position of... -
Orbit orientation and eye morphometrics in giraffes (Giraffa camelopardalis)
Item type: Journal Article • Journal: African Zoology • Authors: G. Mitchell --- Centre for Veterinary Wildlife Studies, University of Pretoria, South Africa D.G. Roberts --- Centre for Veterinary Wildlife Studies, University of Pretoria, South Africa S.J. van Sittert --- Centre for Veterinary Wildlife Studies, University of Pretoria, South Africa J.D. Skinner --- Centre for Veterinary Wildlife Studies, University of Pretoria, South AfricaGiraffe are thought to have excellent vision. We measured eye size, orbit orientation and retina surface area in 27 giraffes of both sexes ranging in age from neonates to mature adults (>10 yrs), to assess how it changes with growth,... -
Temporal and spatial differences in three-egg clutch frequency of the African Black Oystercatcher
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Dane M Paijmans --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Douglas Loewenthal --- , Peter G Ryan --- Percy FitzPatrick Institute of African Ornithology, DST–NRF Centre of Excellence, South Africa Philip AR Hockey --- ,African Black Oystercatchers Haematopus moquini produce a modal clutch size of two eggs and only rarely lay three eggs. A review of over 4 000 nest records from across their breeding range (dating back to the early 1960s) revealed that... -
Company-specific characteristics affecting oil and gas reserves disclosure in the United Kingdom
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Wilson Uchenna Ani --- Department of Banking and Finance, Nigeria Philip Obialor --- Coxswain Social Investment Plus (CSI+) (Consultants), Nigeria Odo Cosmas --- Department of Marketing, Nigeria David Okelue Ugwunta --- Department of Banking and Finance, NigeriaThis paper investigates company-specific characteristics affecting oil and gas reserves disclosure in the United Kingdom. Using a sample selected through purposive and stratified random sampling from 83 UK oil and gas exploration and production companies listed on the London Stock... -
Value and size investment strategies during the global financial crisis: evidence from the South African equity market
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: K. J. Barnard --- Department of Accounting, South Africa M. B. Bunting --- Department of Accounting, South AfricaValue/growth and size investment strategies involve the creation of equity portfolios on the bases, respectively, of intrinsic value relative to market value and market capitalisation. The propositions that a portfolio of high relative intrinsic value shares anomalously outperforms a low... -
On pricing kernels, information and risk
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Diane L. Wilcox --- School of Computational & Applied Mathematics, South Africa Tim J. Gebbie --- School of Computational & Applied Mathematics, South AfricaThis paper compares out-of-sample, ex-ante risk and returns of arbitrage pricing theory (APT) risk-factor based, zero-cost portfolios with characteristic-based, zero-cost portfolios. In particular the Haugen and Baker characteristic-based model framework is used in a comparison with the capital asset pricing... -
A review of capital market theory from a South African Perspective
Item type: Journal Article • Journal: De Ratione • Authors: D.J. Bradfield --- University of Cape Town,The vast quantity of finance literature dealing with Capital Market Theory on the New York Stock Exchange (NYSE) is evidence of the demand for research in this area. Until very recently, almost no research In this area has been conducted... -
Further Evidence of Firm Size and Earnings Anomalies on the Johannesburg Stock Exchange
Item type: Journal Article • Journal: De Ratione • Authors: Michael J. Page --- Graduate School of Business,In spite of the large body of evidence in favour of capital market efficiency in the semi-strong form, several enigmatic findings persist. As much of the research is based on the theoretical foundation of the Capital Asset Pricing Model, the... -
Food and wine pairing: A new approach
Item type: Journal Article • Journal: • Authors: Peter Klosse --- Academie voor Gastronomie, Hotel Gastronomique De Echoput, Hoog Soeren, NetherlandsFlavour can be assessed objectively with the use of the newly developed flavour styles theory. In this approach, flavour is structured on the parameters contracting mouthfeel, coating mouthfeel and flavour richness. The result is the flavour styles cube. The eight... -
Country selection strategies based on value, size and momentum
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Adam Zaremba --- Poznań University of Economics, PolandThis study provides convincing evidence that stock markets with low capitalisation, low valuation ratios and high momentum tend to outperform country markets with high capitalisation, high valuation ratios and low momentum. Based on sorting procedures and cross-sectional tests conducted across... -
Characteristics and management options of crusting soils in a smallholder farming area of the Zambezi metamorphic belt in northern Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Alen Manyevere --- University of Limpopo, South Africa Courage Bangira --- Chinhoyi University of Technology, Zimbabwe Jephita Gotosa --- Bindura University of Science Education, Zimbabwe Lawrence Munjonji --- University of Limpopo, South Africa Emmanuel Chikwari --- Chemistry and Soil Research, ZimbabweCrusting and surface-sealing soils present productivity challenges to smallholder farmers despite their high inherent fertility. Crop production on crusting soils is costly due to unfavourable conditions such as surface capping and compaction, which hinder crop emergence. A study was conducted... -
Current conservation status of the Blue Swallow Hirundo atrocaerulea Sundevall 1850 in Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Steven W Evans --- SARCHI Chair on Biodiversity Value and Change, School of Mathematical and Natural Sciences, South Africa Ara Monadjem --- Department of Biological Sciences, South Africa Lizanne Roxburgh --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Andrew E McKechnie --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, Department of Zoology and Entomology, South Africa Ellizabeth M Baker --- Tanzanian Bird Atlas Project, United Republic of Tanzania Robert B Kizungu --- Organisation of Biodiversity Information and Conservation in Congo Kinshasa, Democratic Republic of Congo Ian T Little --- Endangered Wildlife Trust, South Africa Fadzai Matsvimbo --- BirdLife Zimbabwe, Zimbabwe Ronald K Mulwa --- National Museums of Kenya and Nature Kenya, Kenya Daniel Mwizabi --- Zambian Wildlife Authority, Zambia Dianah Nalwanga --- Nature Uganda, Uganda Kariuki Ndang'ang'a --- BirdLife International, Africa Partnership Secretariat, Kenya Leigh Combrink --- Endangered Wildlife Trust, South AfricaThe global Blue Swallow Hirundo atrocaerulea was classified as Vulnerable in 2010 on account of its small and rapidly declining population estimated at less than 1 500 pairs. We undertook this study to gain a better understanding of the current... -
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... -
Temporal changes in cranial size in South African vlei rats (Otomys): evidence for the ‘third universal response to warming’
Item type: Journal Article • Journal: African Zoology • Authors: Aluwani Nengovhela --- Department of Ecology and Resource Management, School of Environmental Sciences, South Africa Roderick M Baxter --- Department of Ecology and Resource Management, School of Environmental Sciences, South Africa Peter J Taylor --- South African Research Chair on Biodiversity Value and Change in the Vhembe Biosphere Reserve, School of Mathematics and Natural Sciences, South AfricaUsing museum collections and recently collected specimens we studied geographical and temporal (from 1906 to 2013) changes in skull size of two sibling species of rodents, Otomys auratus and O. angoniensis, in northern South Africa occupying distinct temperate grassland (O... -
Photo-identification and habitat use of Atlantic humpback dolphins Sousa teuszii around the Río Nuñez Estuary in Guinea, West Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CR Weir --- Ketos Ecology, UKEcological data for the Atlantic humpback dolphin Sousa teuszii are scant. Six on-effort Sousa teuszii sightings were recorded during 817.6 km of boat-based effort in the Río Nuñez region of Guinea during October and November 2013. Two incidental sightings were also... -
Intertidal population structure of the edible mollusc Turbo sarmaticus (Vetigastropoda) at an unexploited and exploited sites along the coast of the Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: G.G. Foster --- Department of Zoology & Entomology, South Africa A.N. Hodgson --- Department of Zoology & Entomology, South AfricaThe intertidal population structure of the large edible gastropod Turbo sarmaticus was examined at four sites along the Eastern Cape Province of South Africa. One site was free from exploitation, two were subjected to low levels of exploitationand one was... -
Geographic variation in sexual size dimorphism in the rock agama, Agama atra (Sauria: Agamidae)
Item type: Journal Article • Journal: African Zoology • Authors: A.F. Flemming --- National Museum, South Africa P. le F.N. Mouton --- Department of Zoology, South AfricaSignificant sexual dimorphism in overall size occurs in the rock agama, Agama atra (Sauria; Agamidae), with males growing larger than females. Geographic variation in the degree of sexual size dimorphism also exists, males growing significantly larger than females in Namaqualand... -
Feeding biology of the giant clingfish Chorisochismus dentex – implications for limpet populations
Item type: Journal Article • Journal: African Zoology • Authors: Y.A.R.G. Lechanteur --- Marine Biology Research Institute, South Africa K. Prochazka --- Marine Biology Research Institute, South AfricaThe behaviour of the giant clingfish, Chorisochismus dentex, feeding on limpets was investigated in the laboratory and in the field. Prey size and species preference were determined in captivity, and compared with observations of stomach contents obtained from fishes in... -
Territoriality and breeding success in Gurney’s sugarbird, Promerops gurneyi
Item type: Journal Article • Journal: African Zoology • Authors: K.M. Calf --- Department of Zoology, South Africa C.T Downs --- School of Botany and Zoology, South Africa M.I. Cherry --- Department of Zoology, South AfricaTerritory size and quality were determined for Gurney’s sugarbirds in Qwaqwa National Park, northeastern Free State, South Africa. Changes in territory size of Gurney’s sugarbirds during the six-month season reflect increases in numbers of territorial birds and inflorescences at mid... -
Invasion of sandflats in Langebaan Lagoon, South Africa, by the alien mussel Mytilus galloprovincialis: size, composition and decline of the populations
Item type: Journal Article • Journal: African Zoology • Authors: N. Hanekom --- South African National Parks, South Africa P. Nel --- West Coast National Park, South AfricaSince the 1980s the introduced Mediterranean mussel (Mytilus galloprovincialis) has successfully invaded the southern African coastline and has become the dominant species on rocky intertidal shores of the west coast. This study investigates a recent extension of its distribution into... -
Diets of Cape clawless otters at two South African coastal localities
Item type: Journal Article • Journal: African Zoology • Authors: W. Emmerson --- Department of Zoology, South Africa S. Philip --- Department of Zoology, South AfricaThe diet of the Cape clawless otter Aonyx capensis was investigated at the Dwessa Nature Re serve and Mkambati Nature Reserve on the Wild Coast, Eastern Cape Province, South Africa. Their diet was more varied at Mkambati (15 prey species)... -
Field evidence for aseasonality of reproduction and colony size in the Afrotropical giant mole-rat Fukomys mechowii (Rodentia: Bathyergidae)
Item type: Journal Article • Journal: African Zoology • Authors: Alfred M. Sichilima --- Mammal Research Institute, University of Pretoria, South Africa Chris G. Faulkes --- School of Biological and Chemical Sciences, Queen Mary, U.K. Nigel C. Bennett --- Mammal Research Institute, University of Pretoria, South AfricaThe giant mole-rat, Fukomys mechowii is a cooperatively breeding subterranean mole-rat exhibiting a reproductive division of labour in which usually one, or occasionally two, females are responsible for procreation. In a field study that involved complete excavation of 32 burrow... -
Sexual dimorphism in the African legless skink subfamily Acontiinae (Reptilia: Scincidae)
Item type: Journal Article • Journal: African Zoology • Authors: N.J.L. Heideman --- Department of Zoology and Entomology, South Africa S.R. Daniels --- Department of Botany and Zoology, South Africa P.L. Mashinini --- Department of Zoology and Entomology, South Africa M.E. Mokone --- Department of Zoology and Entomology, South Africa M.L. Thibedi --- Department of Zoology and Entomology, South Africa M.G.J. Hendricke --- Department of Biodiversity and Conservation Biology, South Africa B.A. Wilson --- Western Cape Education Department, South Africa R.M. Douglas --- National Museum, South AfricaThe extent to which sexual dimorphism in snout–vent length, tail length and head shape (length, width and height) manifests itself in the legless fossorial skink subfamily Acontiinae was investigated in representatives of all four of its genera, Acontias, Microacontias, Acontophiops... -
Reproductive biology of a pride of lions on Karongwe Game Reserve, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Monika B. Lehmann --- Department of Nature Conservation, South Africa Paul J. Funston --- Department of Nature Conservation, South Africa Cailey R. Owen --- K.e.r.i. Research, Ecological Institute of Research, South Africa Rob Slotow --- School of Biological and Conservation Sciences, South AfricaThe reproductive biology of a pride of lions (Panthera leo) was studied on the 8500 ha Karongwe Game Reserve from 1999 to 2005. Over this period, the pride consisted of between four and 11 lions with a paired coalition of... -
Recent population trends of sooty and light-mantled albatrosses breeding on Marion Island
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Schoombie --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South Africa RJM Crawford --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa AB Makhado --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South Africa BM Dyer --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa PG Ryan --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, University of Cape Town, South AfricaSub-Antarctic Marion Island is one of the few islands where both species of Phoebetria albatrosses breed sympatrically. The last published assessment of their population trends, which reported counts up to 2008, concluded that the numbers of breeding pairs of sooty... -
Extensive netting in Albasini and Nandoni dams: a potential threat to fish as a sustainable food source in the Vhembe District, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IEJ Barnhoorn --- Department of Zoology, South Africa JC van Dyk --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaFish populations in Albasini and Nandoni dams are negatively affected by extensive netting practices. This observation was made by the authors following a number of fish health assessment surveys related to aquatic pollution in the Luvuvhu River catchment. A comparison... -
Population parameters and exploitation rate of Sarotherodon galilaeus galilaeus (Cichlidae) in Lakes Doukon and Togbadji, Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Lederoun --- Laboratory of Functional and Evolutionary Morphology, Belgium P Vandewalle --- Laboratory of Functional and Evolutionary Morphology, Belgium AA Brahim --- Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, Benin J Moreau --- Department of Aquatic Environment, France PA Lalèyè --- Laboratory of Hydrobiology and Aquaculture, Faculty of Agricultural Sciences, BeninGrowth, mortality, recruitment and relative yield per recruit of Sarotherodon galilaeus galilaeus from Lakes Doukon and Togbadji were studied. Data on total length, total weight and sex were recorded on a monthly basis between January and December 2013 for S... -
Nutrition in paediatric Crohn’s disease
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: O. Goulet --- Department of Pediatric Gastroenterology, Hepatology and Nutrition, FranceInflammatory bowel disease (IBD) such as Crohn’s disease (CD) results from the interaction between an individual’s immune response and precipitant environmental factors, which generate an anomalous chronic inflammatory response in those who are genetically predisposed. Protein-energy malnutrition (PEM) is a... -
Perceptions of body size and its association with HIV/AIDS
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: T. Matoti-Mvalo --- Diva Nutritional Products, T. Puoane --- School of Public Health,Objective: To explore the perception among black South African women that people who are thin are infected with HIV or have AIDS. -
Relationship between clutch size, egg volume and hatching success in a Yellow-legged Gull Larus michahellis colony in south-eastern Tunisia
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Abdessalem Hammouda --- Département des Sciences de la Vie, Tunisia Foued Hamza --- Département des Sciences de la Vie, Tunisia Jessica Pearce-Duvet --- Centre d'Ecologie Fonctionnelle et Evolutive (CEFE), France Slaheddine Selmi --- Département des Sciences de la Vie, TunisiaThis study aimed to test the hypothesis that clutch size covaries with egg volume and hatching success in the Yellow-legged Gull Larus michahellis. We determined clutch size and egg volume in a sample of 131 nests, and we used the... -
Comparison of distance sampling estimates to a known population size of Ant-eating Chats Myrmecocichla formicivora
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ute Stenkewitz --- Icelandic Institute of Natural History, Iceland Eric Herrmann --- 48 Van Riebeeck Street, South AfricaLine-transect sampling was used to obtain abundance estimates of an Ant-eating Chat Myrmecocichla formicivora population to compare these with the true size of the population. The population size was determined by a long-term banding study, and abundance estimates were obtained... -
Sexual size dimorphism and morphometric sexing in a North African population of Laughing Doves Spilopelia senegalensis
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Tasnim Ayadi --- Département des Sciences de la Vie, Faculté des Sciences, Tunisia Abdessalem Hammouda --- Département des Sciences de la Vie, Faculté des Sciences, Tunisia Samia Kididi --- Laboratoire d’Elevage et Faune Sauvage, Tunisia Mohamed Habib Yahyaoui --- Laboratoire d’Elevage et Faune Sauvage, Tunisia Slaheddine Selmi --- Département des Sciences de la Vie, Faculté des Sciences, TunisiaLike the majority of Columbiformes, the Laughing Dove Spilopelia senegalensis is sexually monomorphic in plumage, but seems to be slightly dimorphic in size. However, due to the lack of studies little is known about the sexual size dimorphism in this... -
Does the exclusion of meiofauna affect the estimation of biotic indices using stream invertebrates?
Item type: Journal Article • Journal: African Zoology • Authors: John G Mbaka --- Biological Sciences Department, Kenya Charles M M’Erimba --- Biological Sciences Department, Kenya Henry T Karanja --- Natural Resources Department, Kenya Jude M Mathooko --- Global Research Akademic and Mentoring Services, Kenya Mercy W Mwaniki --- Department of Geomatic Engineering and Geospatial Information Sciences, KenyaBiomonitoring of rivers is usually undertaken using information based on macroinvertebrate assemblages. However, exclusion of meiofauna (i.e. invertebrates less than 0.5 mm in size) when sorting benthic invertebrates can affect the estimation of densities and other biotic indices. In the present... -
Biological data from sharks landed within the United Arab Emirates artisanal fishery
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RW Jabado --- Biology Department, Faculty of Science, United Arab Emirates SM Al Ghais --- Biology Department, Faculty of Science, United Arab Emirates W Hamza --- Biology Department, Faculty of Science, United Arab Emirates DP Robinson --- Life Sciences Department, UK AC Henderson --- The School for Field Studies, Turks and Caicos IslandsLanding site and market surveys of sharks landed along the Arabian Gulf coast of the United Arab Emirates were undertaken between October 2010 and September 2012 to obtain biological data from this artisanal fishery. Data were collected on the size... -
Cape cormorants decrease, move east and adapt foraging strategies following eastward displacement of their main prey
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RJM Crawford --- Branch: Oceans & Coasts, Department of Environmental Affairs, South Africa RM Randall --- South African National Parks, South Africa TR Cook --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa PG Ryan --- Percy FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa BM Dyer --- Branch: Oceans & Coasts, Department of Environmental Affairs, South Africa R Fox --- Addo Elephant National Park, South African National Parks, South Africa D Geldenhuys --- CapeNature, Voëlklip, South Africa J Huisamen --- CapeNature, Voëlklip, South Africa C McGeorge --- CapeNature, Voëlklip, South Africa MK Smith --- South African National Parks, South Africa L Upfold --- Branch: Oceans & Coasts, Department of Environmental Affairs, South Africa J Visagie --- CapeNature, Scientific Services, Assegaaibosch Nature Reserve, South Africa LJ Waller --- CapeNature, Voëlklip, South Africa PA Whittington --- Department of Zoology, South Africa CG Wilke --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries, South Africa AB Makhado --- Branch: Oceans & Coasts, Department of Environmental Affairs, South AfricaNumbers of Cape cormorants Phalacrocorax capensis breeding in South Africa decreased by nearly 50% from approximately 107 000 pairs in 1977–1981 to 57 000 pairs in 2010–2014. Although four colonies had >10 000 pairs in 1977–1981, there was just one... -
Atlantic humpback dolphins Sousa teuszii in the Saloum Delta (Senegal): distribution, relative abundance and photo-identification
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CR Weir --- Ketos Ecology, UKDuring October and November 2015, the first systematic survey of Sousa teuszii was carried out in the Saloum Delta (Senegal, West Africa), comprising 1 617.5 km of boat-based survey coverage. Thirty sightings were recorded in the Saloum and Diomboss rivers,... -
Size and value effects in equity hedge funds
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Jung-Min Kim --- College of Business Administration, Republic of KoreaContrary to the findings in mutual funds, both size and value effects appear in equity hedge funds. Small-cap/value funds outperform large-cap/growth funds. Both asset and share liquidity measures show that small-cap/value funds manage less liquid assets and are more likely... -
Clutch, egg and hatchling characteristics in the Souss Valley tortoises, Testudo graeca soussensis Pieh, 2001 (Testudines: Testudinidae) from an arid steppe-land of west-central Morocco
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Nawal Hichami --- , , Morocco Mohammed Znari --- , , Morocco Mohamed Naimi --- , , Morocco Salwa Namous --- , , MoroccoClutch, egg and hatchling characteristics in the Souss Valley tortoises Testudo graeca soussensis (Testudinidae) from an arid steppe area of west-central Morocco were investigated in semi captivity in spring–early summer 2011. Mating activity occurs twice in the year, mainly in... -
Variation in body size and morphometric traits of males and females of the wall gecko, Tarentola delalandii (Phyllodactylidae) from different environments on Tenerife
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: María de Fuentes-Fernández --- , Spain María Mercedes Suárez-Rancel --- , , Spain Miguel Molina-Borja --- , SpainWe analysed sexual dimorphism in body size and several other morphological traits of two populations of Tarentola delalandii on the island of Tenerife (San Cristóbal de La Laguna in the North, and Granadilla de Abona in the South), whose habitats... -
Reproductive traits of the freshwater oyster Etheria elliptica (Bivalvia: Etheriidae) in the Pendjari River, Benin: implications for conservation
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GD Akélé --- Laboratoire d’Hydrobiologie et d’Aquaculture, Faculté des Sciences Agronomiques, Bénin E Montchowui --- Laboratoire d’Hydrobiologie et d’Aquaculture, Faculté des Sciences Agronomiques, Bénin PA Lalèyè --- Laboratoire d’Hydrobiologie et d’Aquaculture, Faculté des Sciences Agronomiques, BéninThe African freshwater oyster Etheria elliptica, which is of great economic importance throughout the continent, is facing overharvesting in many fisheries in West Africa. Its reproductive traits (sex ratio, size at sexual maturity, oocyte diameter and fecundity) were studied at... -
Seasonality in the cross section of factor premia
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Adam Zaremba --- Department of Investment and Capital Markets, PolandThis study examines the seasonality effect in the cross section of factor premia representing a broad set of stock market strategies. Using cross-sectional and time-series tests, we investigated the cross-sectional seasonality of market, value, size, momentum, quality and low-risk premia... -
Comparison of wood, fibre and vessel properties of drought-tolerant eucalypts in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sven-Olof Lundqvist --- Innventia AB, Sweden Thomas Grahn --- Innventia AB, Sweden Lars Olsson --- Innventia AB, Sweden Thomas Seifert --- Department of Forest and Wood Science, South AfricaThree drought-tolerant eucalypt genotypes have been investigated for a broad spectrum of properties to provide a basis for comparison on their suitability for various end-uses. The genotypes included were a Eucalyptus grandis × E. camaldulensis hybrid, E. gomphocephala and E... -
Avian guild assemblages in forest fragments around Budongo Forest Reserve, western Uganda
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Moreen Uwimbabazi --- Department of Forest Biology and Ecosystems Management, Uganda Amy E Eycott --- Institute of Biology, Norway Fred Babweteera --- Royal Zoological Society of Scotland, UK Eric Sande --- Department of Biological Sciences, Uganda Richard J Telford --- Institute of Biology, Norway Vigdis Vandvik --- Institute of Biology, NorwayRemnant forest fragments provide an opportunity for conservation in fragmented landscapes but some patches are more useful than others. Forest fragments around Budongo Forest Reserve, an Important Bird Area in western Uganda, were surveyed to explore the effects of different... -
Benthic freshwater nematode community dynamics under conditions of Tilapia aquaculture in Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AEA Abada --- Zoology Department, Egypt NF Ghanim --- Zoology Department, Egypt AH Sherif --- Department of Fish diseases, Kafrelsheikh Provincial Laboratory, Egypt NA Salama --- Zoology Department, EgyptStudies of the influence of fish aquaculture on benthic freshwater nematode assemblages are scarce, but could provide a way of gauging environmental effects. The abundance and diversity of nematode assemblages in response to Oreochromis niloticus aquaculture were investigated in Kafr... -
Vertical distribution of living mangrove foraminifera from KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KL Strachan --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa TR Hill --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa JM Finch --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South AfricaModern foraminiferal assemblage zones can be used to reconstruct palaeo sea levels when applied to fossil foraminifera down a sediment core. Previous intertidal foraminiferal studies have predominantly focused on assemblages in surface sediments (0–1 cm), with the rationale that surface... -
Exploratory factor analysis on drivers of firm’s growth among construction SMEs in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: B. M. Arthur-Aidoo --- Sustainable Human Settlement and Construction Research Centre, Faculty of Engineering and the Built Environment, South Africa C. O. Aigbavboa --- Sustainable Human Settlement and Construction Research Centre, Faculty of Engineering and the Built Environment, South Africa W. D. Thwala --- Sustainable Human Settlement and Construction Research Centre, Faculty of Engineering and the Built Environment, South AfricaThe growth of construction SMEs is imperative if an economy is to develop. Numerous factors influence the growth of construction SMEs due to the nature of their operation. Their growth can also be driven their activities which can be classified... -
Sample-size determination and adherence in randomised controlled trials published in anaesthetic journals
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: M Nontshe --- Metropolitan Department of Anaesthetics, Critical Care and Pain Management, South Africa S Khan --- Metropolitan Department of Anaesthetics, Critical Care and Pain Management, South Africa T Mandebvu --- Metropolitan Department of Anaesthetics, Critical Care and Pain Management, South Africa B Merrifield --- Metropolitan Department of Anaesthetics, Critical Care and Pain Management, South Africa RN Rodseth --- Metropolitan Department of Anaesthetics, Critical Care and Pain Management, South AfricaBackground: Sample-size calculations are critical to ensure that randomised control trials return robust and reliable results. The estimated treatment effects used in these calculations is often significantly different from the actual treatment effect and can dramatically impact trial validity. -
How many can you catch? Factors influencing the occurrence of multi-prey loading in provisioning Greater Crested Terns
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Davide Gaglio --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Timothée R Cook --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Richard B Sherley --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South Africa Peter G Ryan --- DST-NRF Centre of Excellence at the FitzPatrick Institute of African Ornithology, Department of Biological Sciences, South AfricaSeabirds use several methods to transport food to their chicks; most species carry food in their stomachs or crops, but some terns and auks carry prey in their bills. Terns usually only carry one prey item at a time, limiting... -
Programmatic mapping to determine the size and dynamics of sex work and injecting drug use in Mauritius
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Amita Pathack --- National AIDS Secretariat, Mauritius Ahmed Saumtally --- National AIDS Secretariat, Mauritius Sarah Soobhany --- National AIDS Secretariat, Mauritius Carly A Comins --- National AIDS Secretariat, Mauritius Said A H Kinoo --- National AIDS Secretariat, Mauritius Faran Emmanuel --- Centre for Global Public Health, CanadaHIV in Mauritius is in a concentrated phase. Most HIV infection is among key populations (KPs) including female sex workers (FSW), people who inject drugs (PWID), men who have sex with men (MSM), and transgender sex workers (TGSW). The objective... -
Reproductive strategies of smooth-head catfish Clarias liocephalus (Boulenger, 1898), in the Rwizi-Rufuha wetland system, south-western Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Yatuha --- Biology Department, Uganda J Rutaisire --- National Agricultural Research Organization, Uganda L Chapman --- Department of Biology, Canada J Kang’ombe --- Bunda College of Agriculture, Malawi D Sikawa --- Bunda College of Agriculture, MalawiThe reproduction of the smooth-head catfish (Clarias liocephalus), a heavily exploited wetland fish in Uganda, in a data-deficient fishery, was studied from January to December 2011. Analyses were based on a sample of 854 fish specimens obtained from a chain... -
The BRIC and African Countries’ Informal Economies: Differences, Similarities and Some General Observations
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Aareni Ammal Uruthirapathy --- School of Business, Trent University, Canada Moses N. Kiggundu --- Sprott School of Business, Carleton University, CanadaThis study examines whether African countries can learn from the experiences of BRIC countries that have informal economies. Our analysis revealed that some characteristics of the informal economy are common in both the BRIC and the select African group. 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)... -
Characterisation of the soil pore system in relation to its hydraulic functions in two South African aeolian soil groups
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Achamyeleh G Mengistu --- Department of Soil, Crop and Climate Sciences, South Africa Sabelo SW Mavimbela --- Department of Soil, Crop and Climate Sciences, South Africa Leon D van Rensburg --- Department of Soil, Crop and Climate Sciences, South AfricaThe characterisation of soil pores has a prime importance in soil hydrology particularly for soil water management in both irrigated and dryland agriculture. Hence, this study describes the soil pore system in the Clovelly and Hutton soil forms and its... -
Forest gap size can efficiently promote litter decomposition and nutrient release in south-western China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Xun Li --- Key Laboratory of Ecological Forestry Engineering, China Danju Zhang --- Key Laboratory of Ecological Forestry Engineering, China Yan Zhang --- Key Laboratory of Ecological Forestry Engineering, China Jian Zhang --- Key Laboratory of Ecological Forestry Engineering, China Simeng Song --- Key Laboratory of Ecological Forestry Engineering, China Yang Zhou --- Key Laboratory of Ecological Forestry Engineering, ChinaForest gaps are important in forest dynamics and management; however, the gap size that is most conducive to the decomposition of litter and promotion of nutrient cycling in forests remains poorly understood. The mass loss and nutrient release from Pinus... -
Population biology of the woodland dormouse Graphiurus murinus in a riverine Combretum forest, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Zimkitha JK Madikiza --- School of Animal, Plant and Environmental Sciences, South Africa Sandro Bertolino --- Department of Life Sciences and Systems Biology, Italy Emmanuel Do Linh San --- Department of Zoology and Entomology, South AfricaUntil recently, very little was known of the biology and ecology of the woodland dormouse Graphiurus murinus, a nocturnal and arboreal rodent belonging to the family Gliridae. Here, we aimed to increase our knowledge on its population biology in a... -
Effect of Seed Tuber Planting Depth and Nitrogen Rate on Yield and Yield Related Traits of Potato (Solanum tuberosum L.) at Haramaya and Hirna, Eastern Ethiopia
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: Bulti Merga --- School of Plant Sciences, Ethiopia Nigussie Dechassa --- School of Plant Sciences, Ethiopia Wassu Mohammed --- School of Plant Sciences, EthiopiaThe potato (Solanum tuberosum L.) is an important cash and food security crop in the eastern highlands of Ethiopia. However, the yield of the crop is constrained by low soil fertility and poor agronomic practices. Therefore, the field experiment was... -
Effect of residue management and fertiliser application on the productivity of a Eucalyptus hybrid and Acacia mangium planted on sloping terrain in northern Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Nguyen Van Bich --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Daniel Mendham --- CSIRO Land and Water, Australia Katherine J Evans --- Tasmanian Institute of Agriculture, University of Tasmania, Australia Tran Lam Dong --- Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Vietnam Vo Dai Hai --- Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Vietnam Hoang Van Thanh --- Silviculture Research Institute, Vietnamese Academy of Forest Sciences, Vietnam Caroline L Mohammed --- Tasmanian Institute of Agriculture, University of Tasmania, AustraliaForest plantation growers in Vietnam commonly burn residues after harvesting and often apply suboptimal amounts of nutrients during plantation establishment. We examined whether the retention of forest residue, and application of phosphorus fertiliser at higher rates, can increase rates of... -
Institutional logics and sustainability of selected small and medium-sized audit firms
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Carla Coetzee --- Department of Auditing, South Africa Karin Barac --- Department of Auditing, South Africa Joanne Seligmann --- Department of Financial Management, South AfricaAlthough an abundance of research exists concerning larger audit firms, studies on small-scale audit firms are scarce. This study investigates how small and medium-sized audit firms deal with professional and commercial logic for sense-making and legitimisation of their strategies and... -
Population structure and growth of the beaked clam Eumarcia paupercula (Bivalvia, Veneridae) in Maputo Bay, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: ED Mugabe --- Centre of Coastal Studies and School of Marine and Coastal Sciences, Mozambique CA Amoda --- Centre of Coastal Studies and School of Marine and Coastal Sciences, Mozambique CL Griffiths --- Marine Research Institute and Department of Biological Sciences, South AfricaThe edible beaked clam Eumarcia paupercula (Holten, 1802) is an abundant component of the intertidal infauna in Maputo Bay, Mozambique, and is an important source of food and income for local communities. This study investigates the population structure and estimates... -
Ecology, conservation, and phylogenetic position of the Madagascar Jacana Actophilornis albinucha
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Josephine D’Urban Jackson --- Milner Centre for Evolution, Department of Biology and Biochemistry, United Kingdom Sama Zefania --- Institut d’Enseignement Supérieur de Menabe, Madagascar Sebastien Moehy --- Institut d’Enseignement Supérieur de Menabe, Madagascar Andrew J Bamford --- Wildfowl and Wetlands Trust, United Kingdom Michael W Bruford --- Organisms and Environment Division, School of Biosciences, United Kingdom Tamás Székely --- Milner Centre for Evolution, Department of Biology and Biochemistry, United KingdomThe Madagascar Jacana Actophilornis albinucha (Jacanidae) is an endemic shorebird found in the threatened wetlands of western Madagascar. This species is presumed to exhibit classical polyandry; however, few data are available to support that assumption. More generally, a lack of... -
Geographical and temporal variation in the diet of Bank Cormorants Phalacrocorax neglectus in South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: BM Dyer --- Department of Environment, South Africa J Cooper --- Department of Botany and Zoology, South Africa RJM Crawford --- Department of Environment, South Africa RB Sherley --- Environment and Sustainability Institute, University of Exeter, United Kingdom S Somhlaba --- Department of Environment, South Africa A Cockcroft --- Department of Environment, South Africa L Upfold --- Department of Environment, South Africa AB Makhado --- Department of Environment, South AfricaThe Bank Cormorant Phalacrocorax neglectus is endemic to the Benguela upwelling ecosystem off southwest Africa and is classified as Endangered owing to a recent large reduction in its number. It is thought that food scarcity, including a decreased abundance of... -
Cliff roost site selection of the endangered Cape Vulture Gyps coprotheres in the Eastern Cape province, South Africa
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Francis R Martens --- School of Natural Resource Management, George Campus, South Africa Morgan B Pfeiffer --- School of Natural Resource Management, George Campus, South Africa Colleen T Downs --- School of Life Sciences, South Africa Jan A Venter --- School of Natural Resource Management, George Campus, South AfricaRoost site preferences influence the spatial distribution of species. Large soaring birds often roost on cliffs and large structures, and thus are restricted to areas where safe take-offs and landings can occur. The cliff roosting preferences of the Cape Vulture... -
Breeding ecology of the Cream-coloured Courser in Cape Verde
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Romy Rice --- Department of Evolutionary Zoology and Human Biology, Hungary José O Valdebenito --- Milner Centre for Evolution, United Kingdom Meinolf Ottensmann --- Department of Animal Behaviour, Germany Noémie Engel --- Department of Evolutionary Zoology and Human Biology, Hungary Andreia Adrião --- Maio Biodiversity Foundation, Republic of Cape Verde Tamás Székely --- Department of Evolutionary Zoology and Human Biology, HungaryThe Cream-coloured Courser Cursorius cursor exsul is a data-deficient shorebird distributed across Eurasia and Africa. The subspecies exsul is endemic to the Cape Verde archipelago. In contrast with their mainland breeding sites, where coursers appear to be nomadic and rare... -
Breeding ecology of the Andalusian Buttonquail Turnix sylvaticus sylvaticus
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Carlos Gutiérrez-Expósito --- Departamento de Biología de la Conservación, Estación Biológica de Doñana-CSIC, Spain Ruth García-Gorria --- Ibn Khaldoun 1, El Jadida, Morocco Abdeljebbar Qninba --- Laboratoire de Géo-Biodiversité et Patrimoine Naturel (GEOBIO), Institut Scientifique, Morocco Miguel Clavero --- Departamento de Biología de la Conservación, Estación Biológica de Doñana-CSIC, Spain Eloy Revilla --- Departamento de Biología de la Conservación, Estación Biológica de Doñana-CSIC, SpainUnderstanding the breeding cycle of wildlife is essential to afford conservation strategies. This is especially important for barely studied species and urgent for those at serious risk of extinction. The Andalusian Buttonquail is an endangered endemic of the Western Mediterranean,... -
Biomass partitioning in an endemic southern African salt marsh species Salicornia tegetaria (Chenopodiaceae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CE Brown --- Department of Biodiversity and Conservation Biology, South Africa A Rajkaran --- Department of Biodiversity and Conservation Biology, South AfricaThe below ground biomass of salt marsh species accounts for more than half of the total plant biomass in salt marsh systems, yet no biomass data exist for salt marsh species in South Africa. The aims of the current study... -
Reproductive biology of the mackerel scad Decapterus macarellus from Cabo Verde and the implications for its fishery management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MPV Costa --- Instituto Nacional do Desenvolvimento das Pescas [National Institute for Fisheries Development ] (INDP), Cabo Verde DRS Cruz --- Faculty of Sciences of the University of Lisbon, Portugal LS Monteiro --- Federal University of Rio Grande, Brazil KSM Evora --- University of Cabo Verde, Cabo Verde LG Cardoso --- Federal University of Rio Grande, BrazilThe mackerel scad Decapterus macarellus is of great social and economic importance to Cabo Verde citizens; however, in recent years catches have shown an unexplained decline. The harvest is regulated by way of a minimum legal size and a seasonal... -
Nesting ecology and hatching success of the hawksbill turtle (2004–2014) on Cousine Island, Seychelles
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Gane --- Centre for Functional Biodiversity, School of Life Sciences, South Africa CT Downs --- Centre for Functional Biodiversity, School of Life Sciences, South Africa I Olivier --- Centre for Functional Biodiversity, School of Life Sciences, South Africa M Brown --- Centre for Functional Biodiversity, School of Life Sciences, South AfricaPopulations of the Critically Endangered hawksbill turtle Eretmochelys imbricata in the Seychelles showed significant declines in the past. They have since recovered and nesting numbers are increasing because of increased protection and management intervention. Data on their nesting ecology on... -
Body mass and condition of a fynbos bird community: investigating impacts of time, weather and raptor abundance from long-term citizen- science datasets
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Alan Tristram Kenneth Lee --- , South Africa Phoebe Barnard --- , South Africa Mike Fraser --- , South Africa Chris Lennard --- , South Africa Ben Smit --- , South Africa Hans-Dieter Oschadleus --- , South AfricaVariation in body size, especially mass, is a function of local environmental conditions for any given species. Recent recorded decreases in body size of endotherms have been attributed to climate change in some cases. This prediction is based on the... -
Monteiro’s Hornbills Tockus monteiri do not exhibit addition indeterminacy
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Mark T Stanback --- , United StatesBirds that respond to the addition/removal of eggs by laying fewer/extra eggs are known as indeterminate layers. Species that are insensitive to additions/removals are said to be determinate layers. Hornbills are an interesting group with which to investigate this phenomenon,... -
Small-minus-big predicts betting-against-beta: Implications for international equity allocation and market timing
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Adam Zaremba --- , PolandWe demonstrate a strong relationship between short-term small-firm premium and future low-beta anomaly performance. Rises (declines) in small-firm prices temporarily improve (deteriorate) funding conditions, benefiting (impairing) the short-run returns on the low-beta strategy. To investigate this phenomenon, we examine returns... -
Increasing numbers of a threatened insular population of the Common Raven Corvus corax
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Manuel Siverio --- , Spain Felipe Siverio --- , Spain Beneharo Rodríguez --- , SpainUntil the middle of the 20th century, the Common Raven Corvus corax was an abundant bird in the Canary Islands. However, during recent decades, populations have decreased dramatically in the most densely populated islands, apparently because of changes in land... -
Breeding ecology and nestling growth of the Madagascar Pond Heron Ardeola idae in a monospecific colony at Sofia Lake, northern Madagascar
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Yverlin ZM Pruvot --- , Madagascar Lily-Arison R de Roland --- , Madagascar Marius Rakotondratsima --- , Madagascar Yvette Razafindrakoto --- , Madagascar Felix Razafindrajao --- , Madagascar Rivo Rabarisoa --- , Madagascar Russell Thorstrom --- , United StatesThe breeding ecology of the endangered Madagascar Pond Heron Ardeola idae was studied at Sofia Lake, northern Madagascar, during two consecutive breeding seasons (October 2017–April 2018 and October 2018– April 2019). Altogether 158 nests were documented at a monospecific breeding... -
Common dolphin Delphinus delphis occurrence off the Wild Coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Caputo --- , South Africa PW Froneman --- , South Africa S Plön --- , South AfricaDespite their typical large group sizes, limited research exists on the occurrence of common dolphins Delphinus delphis because of the pelagic, offshore nature of this species and the lack of barriers to their movement in this environment. The main purpose... -
Assessment of subsurface riverbed clogging by fine sediments in a semi-arid catchment of north-western Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AM Bendaoud --- , Algeria KA Haddou --- , Algeria AM Taleb --- , Algeria NO Belaidi --- , AlgeriaIn semi-arid regions, natural and anthropogenic disturbances increase the input of fine particles and their subsequent accumulation in streambeds sediment. The clogging of streambeds sediment is caused by the infiltration of fine particles at depth, reducing hydraulic conductivity (K) and... -
Evaluating Kenya’s coastal gillnet fishery: trade-offs in recommended mesh-size regulations
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: K Osuka --- , Kenya JA Kawaka --- , Kenya MA Samoilys --- , KenyaGillnets are a widely used fishing gear in Kenya’s artisanal fisheries, yet their mesh sizes are inadequately monitored or regulated. This study evaluated the impacts of gillnets of seven stretched-mesh sizes, through comparative analysis of species-related metrics and catch per... -
Anthropogenic food availability and body mass maintenance in urban Red-winged Starlings Onychognathus morio
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Taylyn C Risi --- , South Africa Petra Sumasgutner --- , South Africa Susan J Cunningham --- , South AfricaAnthropogenic food availability is influenced by short-term fluctuations in human presence, especially in core urban areas. Few studies have explored responses to such day-to-week fluctuations, specifically on body mass and body condition of urban birds. Here, we investigated non-breeding body... -
Diet of the mullets Planiliza macrolepis and Moolgarda cunnesius in the Mfolozi-Msunduzi Estuary, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Qwabe --- , South Africa DP Cyrus --- , South AfricaThe mullet species, Planiliza macrolepis and Moolgarda cunnesius, were collected seasonally from Mfolozi-Msunduzi Estuary on the east coast of South Africa in order to determine their diet. The gut contents of 178 fish with standard length (SL) ranging between 100... -
Stakeholders’ perceptions of mammal occurrence and abundance on agricultural properties bordering the Boland Mountain Complex, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Willem A Nieman --- , South Africa Brittany C Schultz --- , South Africa Anita Wilkinson --- , South Africa Alison J Leslie --- , South AfricaThe encroachment of agricultural landscapes on natural ecosystems poses a significant threat to native wildlife persistence. In the Boland Mountain Complex (BMC), the presence of mammals was well documented in the 20th century, but an updated account is lacking. This... -
Structure, growth and growing space efficiency of Pinus radiata (D. Don) trees as affected by their social position
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Hans Pretzsch --- , Germany Andreas Rais --- , Germany Deon Malherbe --- , South Africa Antonio Ruano --- , Spain Hugo Lambrechts --- , The Netherlands Enno Uhl --- , Germany Ben du Toit --- , South AfricaCurrently, silvicultural prescriptions such as thinning monospecific stands from above and transitioning from monospecific to mixed-species stands are scrutinised regarding their ability to reduce stress and damage. That the quantity and quality of the trees harvested by intermediate and final... -
Nestling diet of the Algerian Nuthatch Sitta ledanti, an endemic threatened bird in Babors’ Kabylia region (north-eastern Algeria)
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Mourad Zemouri --- , Algeria Lydia Asloune --- , Algeria Aida Adrar --- , Algeria Abdelouhab Bouchareb --- , Algeria Abdelazize Franck Bougaham --- , AlgeriaThe Algerian Nuthatch is an endemic and protected bird species in Algeria, and its different habitats are threatened by fires and others human actions; the species is therefore considered ‘Endangered’. A faecal samples analysis of the species’ nestlings was done... -
Are Cape Cormorants Phalacrocorax capensis losing the competition? Dietary overlap with commercial fisheries
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: OB Masiko --- , South Africa PG Ryan --- , South Africa CD van der Lingen --- , South Africa L Upfold --- , South Africa S Somhlaba --- , South Africa M Masotla --- , South Africa Y Geja --- , South Africa BM Dyer --- , South Africa RJM Crawford --- , South Africa AB Makhado --- , South AfricaCape Cormorants Phalacrocorax capensis breed in southern Africa’s Benguela upwelling system and in 2013 were listed as Endangered by the IUCN following a population decrease of >50% over their three most recent generations. This decrease was associated with reduced prey... -
Effects of tropical rainforest fragmentation on bird species: a case study from the Bemanevika Protected Area, northwestern Madagascar
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Armand Benjara --- , Madagascar Lily-Arison Rene de Roland --- , Madagascar Marius Rakotondratsima --- , Madagascar Russell Thorstrom --- , United StatesThe effects of forest fragmentation on forest bird species in the Bemanevika Protected Area (PA), northwestern Madagascar, were investigated during two breeding seasons from October 2016 to January 2018. The forest of Bemanevika is composed of large patches of fragmented... -
Characterising epibenthic diversity and physical drivers in unconsolidated marine habitats of Algoa Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HJ Truter --- , South Africa LJ Atkinson --- , South Africa CEO von der Meden --- , South Africa D Bailey --- , South Africa W Goschen --- , South Africa AT Lombard --- , South AfricaUnconsolidated marine sediment habitats spatially make up the majority of global ocean seabed, yet benthic faunal patterns and their abiotic drivers remain poorly understood. Benthic research in Algoa Bay, on the south coast of South Africa, has largely focused on... -
Changes in social dominance in a group of subadult white rhinoceroses (Ceratotherium simum) after dehorning
Item type: Journal Article • Journal: African Zoology • Authors: Samuel G Penny --- , United Kingdom Maxim Withey --- , United Kingdom Rachel L White --- , United Kingdom Dawn M Scott --- , United Kingdom Lynne MacTavish --- , United Kingdom Angelo P Pernetta --- , United KingdomIn many social species physical attributes correlate with dominance rankings and influence the outcomes of dyadic interactions. We investigated the processes that affect white rhinoceros’ social behaviour in response to a reduction in horn size asymmetries within a group of... -
Comparative avifaunal richness and diversity in invasive Acacia dealbata patches and adjacent montane grasslands
Item type: Journal Article • Journal: African Zoology • Authors: Jessica Seath --- , South Africa Charlie Shackleton --- , South AfricaInvasive alien species are regarded as the second greatest threat to biodiversity globally. Yet, at a local scale their effects may vary, underlying the requirement for more local-scale studies across taxa and settings. Here we consider the effects of an... -
Preliminary assessment of the population status and diurnal activity pattern of common bushbuck (Tragelaphus scriptus decula Rüppell, 1835) in Maze National Park, Ethiopia
Item type: Journal Article • Journal: African Zoology • Authors: Eshetu Esatu --- , Ethiopia Abebayehu Desalegn Hailemariam --- , EthiopiaThe common bushbuck (Tragelaphus scriptus decula) is a widely distributed antelope species in Africa that utilises a variety of habitat types. A study was conducted on the population status and diurnal activity pattern of T. s. decula in Maze National... -
Aggregate dynamics and intra-aggregate carbon contents as influenced by long-term wheat production management in semi-arid South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: LS Tlomatsana --- , South Africa PF Loke --- , South Africa E Kotzé --- , South Africa MP Aghoghovwia --- , South AfricaSoil aggregate dynamics have received renewed interest due to their relevance in carbon (C) stabilisation. This study evaluated changes in aggregate-size distribution and intra-aggregate C following 41 years of wheat production in semi-arid central South Africa. Management practices that have... -
Social capital and firm performance nexus: The role of new product development capability and environmental dynamism in an emerging economy
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Patrick Awusak Akanpaaba --- , Ghana Ahmed Agyapong --- , Ghana Henry Kofi Mensah --- , Ghana Samuel Yaw Akomea --- , GhanaThis paper seeks to examine the argument that the social capital and market performance link is more pronounced when it is channelled through the new product development capability of the firm. The study further argues that the indirect effect of... -
The role of HIV/AIDS committees in effective workplace governance of HIV/AIDS in South African small and medium-sized enterprises (SMEs)
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Jocelyn R Vass --- Human Science Research Council,The primary purpose of this study was to assess the role, status and scope of workplace HIV/AIDS committees as a means of effective workplace governance of the HIV/AIDS impact, and their role in extending social protective HIV/AIDS-related rights to employees... -
Long‐term variation in reproductive traits of Bibron's agama, agama impalearis, in Western Morocco
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: M. Znari --- Cadi Ayyad University, Morocco E. El Mouden --- Cadi Ayyad University, Morocco H. Francillon‐Vieillot --- Université Denis Diderot Paris 7, Laboratoire d'Anatomie Comparée, FranceFemale reproductive characteristics (clutch size [CS], egg volume [EV] and egg mass [EM]) of Agama impalearis and their annual variation were studied over a six‐year period (1993–1998) in the central Jbilet mountains, Western Morocco. Females produced one to two clutches... -
Analysis of intraspecific colour variation in the fossorial Coastal Legless Lizard, Microacontias litoralis (Scincidae: Acontiinae)
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: PhomoloL. Mashinini --- Transvaal Museum, South Africa Neil.J. L. Heideman --- University of the Free State, South Africa P. le FrasN. Mouton --- Stellenbosch University, South AfricaAn analysis of intraspecific variation in the fossorial skink Microacontias litoralis revealed that orange‐coloured and melanistic individuals co‐occur at several localities. Body colour was found to be independent of sex and body size. Both orange‐coloured and melanistic in situ embryos... -
Ecological notes on two sympatric Psammophis species from East Africa
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: AmandaM. Cottone --- Villanova University, USA AaronM. Bauer --- Villanova University, USAWe investigated the ecology of two sympatric whipsnakes from East Africa (Psammophis punctulatus trivirgatus and P. biseriatus) by examining preserved museum specimens (n = 40). Both species lacked any significant sexual size dimorphism and displayed seasonal reproductive cycles. These findings... -
Reproduction of the Western Marsh Harrier Circus aeruginosus at the El Maleh Dam reservoir in north-western Morocco
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Abdeslam Rihane --- , Morocco Abdelmottalib Nahli --- Hassan II Université Casablanca, Morocco Rhimou El Hamoumi --- Hassan II Université Casablanca, Morocco Mohamed Chlaida --- Hassan II Université Casablanca, MoroccoThe reproduction of the Western Marsh Harrier Circus aeruginosus in submerged and dried up thickets of French tamarisk Tamarix gallica at El Maleh Dam reservoir, Benslimane Province, Morocco, was studied through monitoring nests in three successive years (2017–2019). Systematic field... -
ICT impact and firm size: Empirical results from Vietnam
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Dang Thi Viet Duc --- , Vietnam Phuoc Van Nguyen --- , VietnamThis paper examines the effect of firm size on firms’ ICT adoption and productivity impact by running models for four size groups of 11,709 Vietnamese firms. The results reveal two main points. Firstly, the application of basic ICT is relatively... -
Effects of Acacia melanoxylon, an alien tree species to South Africa, on Afrotemperate forest tree sapling composition
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tineke Kraaij --- Nelson Mandela University, South Africa Johan A Baard --- , South Africa B Adriaan Grobler --- Nelson Mandela University, South Africa Bayleigh Miles --- Nelson Mandela University, South AfricaThe alien tree Acacia melanoxylon (R.Br.) occurs extensively in the Southern Cape Afrotemperate Forest (South Africa). Concerns exist about its potential negative effects on indigenous tree sapling communities, ultimately with implications for forest composition and structure. We investigated whether Acacia... -
Status and density of the threatened Kori Bustard Ardeotis kori in a woodland savanna
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Kathan Bandyopadhyay --- University of Wyoming, United States Bogdan Cristescu --- , Namibia Jeffrey L Beck --- University of Wyoming, United States John L Koprowski --- University of Wyoming, United States Laurie Marker --- , NamibiaMany grassland habitats have disappeared or undergone substantial change worldwide and many obligatory grassland animal species have populations that are at risk of extinction. The Kori Bustard Ardeotis kori is the largest flying bird native to Africa and an open... -
Moderating role of organizational culture in the relationship between total quality management and organizational innovation among manufacturing SMEs in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Kabir Musa Shuaib --- Tianjin University, People’s Republic of China Zhen He --- Tianjin University, People’s Republic of ChinaPrevious studies on the total quality management and innovation relationship have had mixed findings. We predict that organizational culture could moderate the relationship between total quality management and organizational innovation. The study collected empirical data from 433 small and medium-sized... -
Population size, habitat use and foraging habits of wild Helmeted Guineafowl Numida meleagris in southwestern Ethiopia
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Yihenew Aynalem --- Addis Ababa University, Ethiopia Afework Bekele --- Addis Ababa University, Ethiopia Bezawork Afework Bogale --- Addis Ababa University, EthiopiaThe Helmeted Guineafowl Numida meleagris is a widespread and abundant resident gamebird species in sub-Saharan Africa. It is hunted throughout the region, including in Ethiopia. However, knowledge of the species’ ecology and behaviour in many parts of the country is... -
Effect of rotational harvesting on the size composition of Cape rock oysters Striostrea margaritacea on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn --- Oceanographic Research Institute, South Africa JC Groeneveld --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fishery Science, Uit – The Arctic University of Norway, NorwayA commercial fishery for the Cape rock oyster Striostrea margaritacea along the north coast of KwaZulu-Natal, South Africa (western Indian Ocean), follows a 4-year rotational cycle, with each harvest year followed by 3 fallow years across four harvest zones. We... -
The use of big data and analytics in external auditing: Does audit firm size matter? Evidence from a developing country
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Ahmed S. Abdelwahed --- Cairo University, Egypt Ahmad A. Abu-Musa --- Tanta University, Egypt Hosam Moubarak --- Alexandria University, Egypt Hebatallah A. Badawy --- Egypt-Japan University of Science and Technology, EgyptPurpose: The aims of this research are to investigate the reasons for adopting big data (BD) and big data analytics (BDA), determine their extent of usage, and identify potential obstacles to their adoption in a developing country, Egypt. -
Two-step inertial Tseng’s extragradient method for solving quasimonotone variational inequalities
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: O.T. Mewomo --- University of KwaZulu-Natal, South Africa R.N. Nwokoye --- University of KwaZulu-Natal, South Africa C.C. Okeke --- University of the Witwatersrand, South AfricaWe focus on quasimonotone variational inequality problems with non-Lipschitz operator and combine some operator theory techniques to establish a weak convergent fixed point iterative method to approximate the solution of the presented problems. The convergence analysis assumes very mild conditions... -
Estimation accuracy of bean bags as portion size estimation aids for amorphous foods
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Friedeburg Anna Maria Wenhold --- University of Pretoria, South Africa Una Elizabeth MacIntyre --- University of Pretoria, South Africa -
Genetic consequences in the southern African endemic seabream Polysteganus undulosus (Sparidae) after eight decades of overfishing
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CJ Oosthuizen --- University of Pretoria, South Africa BQ Mann --- Oceanographic Research Institute (ORI), South Africa P Bloomer --- University of Pretoria, South Africa TB Hoareau --- University of Pretoria, South AfricaThe Critically Endangered seventy-four seabream Polysteganus undulosus, a slow-growing sparid that forms spawning aggregations off South Africa, faced heavy exploitation from 1910 until a fishery moratorium was put in place in 1998. Utilising temporal samples from 1962/1963 (mid-collapse) and 2005/2006... -
The African Penguin Spheniscus demersus should be considered Critically Endangered
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Richard B Sherley --- Environment and Sustainability Institute/Centre for Ecology and Conservation, University of Exeter, United Kingdom Azwianewi B Makhado --- , South Africa Robert JM Crawford --- , South Africa Christina Hagen --- , South Africa Jessica Kemper --- , Namibia Katrin Ludynia --- University of the Western Cape, South Africa Makhudu J Masotla --- , South Africa Alistair McInnes --- , South Africa Lorien Pichegru --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa Desmond Tom --- , Namibia Leshia Upfold --- , South Africa Lauren J Waller --- University of the Western Cape, South AfricaThe African Penguin Spheniscus demersus has been considered a threatened species since 1984 and, aside from a short period around 2000, its population has been in constant decline since at least the 1950s. By combining counts of the numbers of... -
Observations on the breeding biology of D’Arnaud’s Barbet Trachyphonus darnaudii
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Henrik Brumm --- Max Planck Institute for Ornithology, Germany Poyo Makomba --- , Tanzania Wolfgang Goymann --- , TanzaniaBreeding behaviour is a key process for avian fitness and evolution, but the basic natural histories of many species are unknown. We studied the breeding biology of D’Arnaud’s Barbet Trachyphonus darnaudii (family Lybiidae) on the Usangu Plains in southwestern Tanzania... -
Firm size and enterprise productivity in Nigeria: Evidence from firm-level data
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ambrose Nnaemeka Omeje --- University of Nigeria, Nigeria Augustine Jideofor Mba --- University of Nigeria, Nigeria Ravinder Rena --- Durban University of Technology, Republic of South AfricaAnchored on the economies of scale of production theory, this study utilized Nigeria’s firm-level enterprise survey data of the World Bank collected through stratified random sampling of 2 676 firms and face-to-face interviews with the application of the multinomial logit... -
Aspects of the reproductive biology of the common Octopus vulgaris from landings in the coastal trawl and artisanal fleets in the Atlantic waters of southern Morocco
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: B Oubahaouali --- Abdelmalek Essaâdi University, Morocco A Kaddouri --- Abdelmalek Essaâdi University, Morocco M Aksissou --- Abdelmalek Essaâdi University, MoroccoAn investigation of aspects of the reproductive biology of the common octopus Octopus vulgaris caught in the Atlantic waters of southern Morocco was undertaken in 2020. The study focused on the demographic structure and sexual maturity of O. vulgaris by... -
Determinants of the effective tax rate: Board composition of South African firms listed on the Johannesburg Stock Exchange
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Cecileen Greeff --- School of Accountancy, Stellenbosch University, South AfricaMotivation: Numerous international studies have been conducted to determine the effect of board composition on tax aggressiveness, and ultimately the effective tax rate (ETR) of firms, but to the best of the author's knowledge, no similar research from a South... -
Size structure and reproductive biology of skipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis in the western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FA Mzingirwa --- Rhodes University, South Africa GM Okemwa --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya MW Farthing --- Rhodes University, South Africa CS Bova --- Rhodes University, South Africa JS Halafo --- Instituto Oceanográfico de Moçambique (InOM), Mozambique JG Mshana --- Sokoine University of Agriculture, Tanzania AA Abubakar --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya N Ishmael --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya WHH Sauer --- Rhodes University, South AfricaSkipjack tuna Katsuwonus pelamis and kawakawa Euthynnus affinis are economically important tuna species targeted by artisanal fishers in the western Indian Ocean. Both species are currently considered sustainably fished despite substantial catches. Even so, ongoing management is crucial to maintain... -
Biometry, hatching efficiency, growth performance and survival of the brine shrimp Artemia franciscana from Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AT Jacob --- Sokoine University of Agriculture, Tanzania IB Kapinga --- , Tanzania AP Mwijage --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania A Luvanga --- Tanzania Fisheries Research Institute (TAFIRI), Tanzania A Mremi --- , Tanzania C Sekadende --- Tanzania Fisheries Research Institute, Tanzania SS Shaban --- Tanzania Fisheries Research Institute, Tanzania HA Lamtane --- Sokoine University of Agriculture, Tanzania AB Matondo --- College of Veterinary Medicine and Biomedical Sciences, Sokoine University of Agriculture, TanzaniaThis study determined the biometry, hatchability and growth performance of a strain of the brine shrimp Artemia franciscana, a species now widely introduced globally, obtained from salt farms in the Tanga Region, Tanzania. The cysts were collected from salt pans... -
First report of Dactylogyrus fimbriphallus (El Gharbi, Birgi & Lambert, 1994) infecting Luciobarbus biscarensis (Boulenger, 1911) in Oued Tadmit River of Djelfa Governorate (Algeria)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Djouhina Chabira --- University of Biskra, Algeria Badreddine Attir --- University of Biskra, Algeria Nurten Aydoğdu --- Balıkesir University, Türkiye Adel Mammeri --- University of Biskra, AlgeriaThis study aimed to determine the occurrence of dactylogyrid communities in Sahara barbel, Luciobarbus biscarensis (Boulenger, 1911), an endemic species to Algeria, according to season and host factors. A total of 78 samples of L. biscarensis were collected seasonally, over... -
The triple burden of obesity, HIV, and anaemia during pregnancy and associations with delivery outcomes in urban South Africans
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Alessandra Prioreschi --- University of the Witwatersrand, South Africa Stephanie V Wrottesley --- University of the Witwatersrand, South Africa Linda Adair --- University of North Carolina at Chapel Hill, USA Kate A Ward --- University of the Witwatersrand, South Africa Shane A Norris --- University of the Witwatersrand, South Africa -
Distance domination and linear-vizing constants
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Paul Horn --- University of Denver, USA Di Qin --- University of Denver, USAGeneralizing and strengthening a classical result of Vizing, Rautenbach proved a linear relationship between the domination number, the maximum degree, the number of vertices, and the number of edges for graphs with no isolated vertices. The sharpest version of this...
