Search
Search results for
We found
168 results for you
-
Site Evaluation in Black Wattle with Special Reference to Soil Factors
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- Silviculture Section, Institute for Commercial Forestry Research, South Africa W. J.K. Aldworth --- Silviculture Section, Institute for Commercial Forestry Research, South AfricaTogether with climate, soil characteristics are the most important factors affecting tree growth. However, the attempts in many site evaluation studies to establish a direct relationship between soil factors and tree growth have not been very successful, the exception being... -
Chemical Evaluation of Leaf Fibre Residues from Tropical Tree Legumes—a Wealth in Social Perspective
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Sunanda Chanda --- Biological Sciences Division, India S.K. Bhaduri --- Department of Chemistry and Microbiology, Jute Technological Research Laboratories, India Sharmistha Das --- Biological Sciences Division, India D. Sardar --- Department of Chemistry and Microbiology, Jute Technological Research Laboratories, IndiaLeaf fibre residues obtained as a by-product during bulk extraction of leaf protein meal from three tropical forest trees viz. Albizzia procera Benth., Dalbergia sisso Roxb. and Delonix regia Raf. were analysed for their chemical and mineral composition. The fibres... -
Yield and morphological responses of a forage sorghum to mefluidide
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D I Bransby --- , A G Matches --- , USA C R Richardson --- , USADue to rapid growth, stem build‐up in forage sorghum crops often leads to considerable wastage by animals and consequent loss of production. In this study the potential of the chemical plant growth regulator, mefluidide, for modifying the morphology of forage... -
Fertilizer requirements and production of Anthephora pubescens nees on a soil of the mangano series in the northern cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.H. Fourie --- Department of Agriculture and Water Supply, L.G. Du Pisani --- Department of Agriculture and Water Supply, C.H. Donaldson --- Department of Agriculture and Water Supply,The reaction of Anthephora pubescens to N, P and K fertilization was evaluated from 1976 to 1983. Dry matter production at N levels of 0; 75 and 150 kg/ha were 1,9; 2,2 and 2,3 ton/ha respectively. This relative poor reaction... -
Effect of wilting on biochemical and microbiological changes in Kikuyu (Pennisetum clandestinum Hochst) silage
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: Maria deFigueiredo --- Department of Agriculture and Water Supply (Natal Region), Republic of South Africa J.P. Marais --- Department of Agriculture and Water Supply (Natal Region), Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaSmall‐scale laboratory silos were used to study the fermentation process of Kikuyu (Pennisetum clandestinum Hochst) silage prepared from grass containing 25% and 40% dry matter. Silage made from grass containing 40% dry matter was found to be better preserved and... -
Die beheer van Amaranthus spp. en die invloed daarvan op Digitaria eriantha gedurende die vestigingsjaar
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.S. Dannhauser --- Departement Landbou en Watervoorsiening, Republiek van Suid‐Afrika AnnelieS. deBeer --- Departement Landbou en Watervoorsiening, Republiek van Suid‐AfrikaThe control of Amaranthus spp. and the influence thereof on Digitaria eriantha during the season of establishment. Chemical control of Amaranthus spp. in newly established Smuts finger grass (D. eriantha) was investigated. A mixture of 800 ml 2,4‐D Amine+1200 ml... -
The effect of nitrogen fertilization on the quality of Kikuyu silage
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: Maria de Figueiredo --- Department of Agriculture and Water Supply (Natal Region), Republic of South Africa J.P. Marais --- Department of Agriculture and Water Supply (Natal Region), Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaSmall‐scale laboratory silos were used to study the fermentation process of Kikuyu (Pennisetum clandestinum Hochst) silage prepared from grass grown at three nitrogen fertilizer levels (300, 400 and 500 kg N/ha/year). Kikuyu grass was cut at three and six‐week growth... -
Die invloed van ontblaring en vog op die tanien‐ en polifenolinhoud van Portulacaria afra
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: A.M. Ras --- , Republiek van Suid‐AfrikaThe influence of defoliation and moisture on the tannin and polyphenol contents of Portulacaria afra. To determine whether tannin and total polyphenol contents of Portulacaria afra change owing to damage, different trees were subjected to three intensities of defoliation, namely,... -
Screening of candidate herbicides in field trials for chemical control of Chromolaena odorata
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Erasmus --- , J. van Staden --- UN/CSIR Research Unit for Plant Growth and Development, Department of Botany,A range of concentrations of a number of herbicides was tested in field trials, for the control of Chromolaena odorata (L.) R.M. King and H. Robinson. The results obtained show that triclopyr, 2,4,5-T and tebuthiuron were consistently the most effective,... -
Chemical control of some broadleaved weeds which grow during winter in untilled maize lands
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. E.L. Thomas --- Summer Grain Sub-Centre,Several experiments have been done at Cedara in attempts to control broadleaved weeds in unfilled lands during winter. A number of herbicide treatments were tested on Conyza spp., Coronopus didymus, Gnaphalium spp., Hypochoeris radicata, Oenothera rosea and Taraxacum officinale. Where... -
Variasie in lipied- en proteïeninhoud van sonneblomsaad en oliekoekmele in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.A. Smith --- Departement Veekunde, Republiek van Suid-Afrika J.P. Hayes --- Departement Pluimveekunde, Republiek van Suid-Afrika Naomi Smith --- Navorsingsinstituut vir Vee- en Suiwelkunde, Republiek van Suid-AfrikaDie variasie in die chemiese samestelling van sonneblom- saad, wat uit verskillende areas aan oliepersers gelewer is, en die invloed daarvan op die samestelling van die geproduseerde oliekoekmele is in die studie ondersoek. Die ontleding van die sade het 'n... -
The effect of some chemical agents on thinning of Golden Delicious and Granny Smith apples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.F. Lourens --- , Republic of South AfricaThinning trials were carried out with various chemical compounds on Golden Delicious and Granny Smith apple trees over a period of three years in the Elgin area in the western Cape. The scorching agents dinoseb (2-sec-butyl-4,-6-dinitrophenol) and paraquat (1,1'-dimethyl-4,4′-bipyridinium ion)... -
The potential effect of environmental conditions on the growth of irrigated cool season pastures in the Dohne Sourveld
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: c. J.G le Roux --- Dohne Agricultural Centre, Republic of South Africa L.G. Howe --- Dohne Agricultural Centre, Republic of South Africa L.P. du Toit --- Dohne Agricultural Centre, Republic of South Africa W. Iveson --- Dohne Agricultural Centre, Republic of South AfricaFour temperate grasses (Festuca arundinaceae, Festuca X Lolium hybrid, Lolium boucheanum and Lolium multiflorum) were grown under irrigation at the Dohne Agricultural Centre. The object was to determine the monthly growth and nutritional value of the grasses. The effects of... -
Towards costing chemical control of Lantana camara L.
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Erasmus --- Cedara Weeds Laboratory, Plant Protection Research Institute, Department of Agricultural Development, Republic of South Africa J. N.G. Clayton --- , Republic of South AfricaSix herbicide treatments are registered in South Africa for the control of Lantana camara L. (lantana). Three of the treatments were selected for a costing analysis of the initial control of lantana, based on their suitability for specific situations in... -
Evaluation of chemical control against the insect complex of groundnuts (Arachis hypogaea L.) in the South African Highveld Region
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.F. van Eeden --- , Republic of South Africa J. B.J. van Rensburg --- Summer Grain Centre, Republic of South Africa T. C. de K. van der Linde --- Department of Zoology and Entomology, Republic of South AfricaChemical compounds representing seed treatments, soil-applied systemic insecticides, contact and systemic corrective sprays were tested on the groundnut pest complex for three seasons in the South African Highveld Region. The efficacy of the compounds was evaluated by determining the effect... -
Development of a chemical control strategy for Chilo partellus (Lepidoptera: Pyralidae) in grain sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. van den Berg --- Summer Grain Centre, Republic of South Africa M.C. van der Westhuizen --- Department of Zoology and Entomology, Republic of South AfricaFour field trials were conducted over three seasons to determine the optimum plant growth stages for single and follow-up insecticide applications for the control of Chilo partellus in grain sorghum. The insecticide was applied at various vegetative and reproductive plant... -
Comparison of various directional insecticide sprays against Busseola fusca (Lepidoptera: Noctuidae) and Chilo partellus (Lepidoptera: Pyralidae) in sorghum and maize
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. van den Berg --- , Republic of South Africa J. B.J. van Rensburg --- , Republic of South AfricaThree methods of directional insecticide application against Busseola fusca and Chilo partellus infestations in the late growth stages of sorghum and maize were compared over two seasons. An insecticide mixture consisting of endosulfan and deltamethrin was applied 10 days after... -
Die invloed van kultivar, stikstofbemesting en tophoogte op die kwaliteit van oonddroogtabak II. Chemiese kwaliteit
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.J. Malan --- Departement Plantproduksie en Grondkunde, Republiek van Suid Afrika P.S. Hammes --- Departement Plantproduksie en Grondkunde, Republiek van Suid Afrika M.C. Dippenaar --- , Republiek van Suid AfrikaDie toenemende vraag na beter kwaliteit oonddroogtabak, het aanleiding gegee tot navorsing om te bepaal watter rol stikstofbemesting, tophoogte en kultivar speel. Vyf oonddroogtabakkultivars (TL33, OD86, A4, OD224 en OD212) is in 'n veldproef onderwerp aan drie stikstofbemestingspeile (70, 100... -
Use of solid waste bagasse from a paper mill as an organic amendment and its effect on some soil properties: a case study
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.C. Hughes --- Soil Science, South Africa S. J.A. Girdlestone --- Soil Science, South AfricaAt a paper mill in KwaZulu-Natal, South Africa bagasse waste was disposed of by burying it in a layer resulting in variable sugar cane growth. The waste was mostly organic fibres, had a high water holding capacity, and contained small... -
Laboratory assay to determine efficacy of insecticides for control of the spotted maize beetle, Astylus atromaculatus Blanchard (Coleoptera: Melyridae), a pest of sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H. du Plessis --- , South Africa J. van den Berg --- , South AfricaSpotted maize beetle, (Astylus atromaculatus), African boll- worm, (Helicoverpa armigera) and various aphid species attack sorghum from flowering onwards. The possibility of simultaneous control of these pests with a single application of an insecticide exists. The efficacy of insecticides registered... -
The impact of leaf rust on spring wheat in the winter rainfall region of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. H.P. Boshoff --- , Republic of South Africa Z.A. Pretorius --- Department of Plant Pathology, Republic of South Africa B.D. van Niekerk --- , Republic of South AfricaIn a field trial established near Malmesbury in the Western Cape during 1999 the effect of Puccinia triticina on yield and quality of the bread wheat (Triticum aestivum L.) cultivar SST 75 was determined. Information on the efficacy of different... -
Fungicide efficacy and the impact of stripe rust on spring and winter wheat in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. H.P. Boshoff --- , Republic of South Africa Z.A. Pretorius --- Department of Plant Sciences, Republic of South Africa B.D. van Niekerk --- , Republic of South AfricaField trials were conducted from 1997 to 1999, in both the winter and summer rainfall areas of South Africa, to determine the effect of Puccinia striiformis Westend, f. sp. tritici Erikss. on yield and quality of bread wheat (Triticum aestivum... -
User-friendly model for chemical equilibrium of CaSO4 solutions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.Z. Jovanovic --- Department Plant Production and Soil Science, South Africa J.G. Annandale --- Department Plant Production and Soil Science, South Africa N. Benadè --- , South AfricaUser-friendly Windows software (ChemEq) was developed for calculation of solution chemical equilibrium and precipitation- dissolution of lime and gypsum. ChemEq calculates ionic concentrations and activities, pH, solid phase gypsum and lime, sodium adsorption ratio and electrical conductivity from initial concentrations... -
Prediction of the chemical composition of winter grain and maize with near infrared reflectance spectroscopy
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Viljoen --- Elsenburg Agricultural Research Centre, South Africa T.S. Brand --- Elsenburg Agricultural Research Centre, South Africa D.A. Brandt --- , South Africa L.C. Hoffman --- Department of Animal Sciences, South AfricaNear infrared reflectance spectroscopy (NIRS) was evaluated as a tool for the fast and inexpensive prediction of nutritional values of feedstuffs. NIRS calibrations were developed for winter grain samples collected over three years in the Western Cape region of South... -
Chemical control of Nysius natalensis Evans (Hemiptera: Orsillidae), a pest of sunflower in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H. du Plessis --- , South Africa M.J. Byrne --- Ecophysiological Studies Research Group, South Africa J. van den Berg --- School of Environmental Sciences and Development, South AfricaNo insecticide is currently registered for Nysius natalensis Evans (Hemiptera: Orsillidae), control on sunflower [Helianthus annuus L. (Asteraceae)]. Field as well as laboratory trials were conducted to evaluate efficacy of insecticides for N. natalensis control. During budding prior to anthesis,... -
Differences in the chemical composition and digestibility of cereal hay and straw produced in a Mediterranean rainfall area of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Viljoen --- Elsenburg Agricultural Research Centre, South Africa T.S. Brand --- Elsenburg Agricultural Research Centre, South Africa L.C. Hoffman --- Department of Animal Sciences, South AfricaChemical composition and digestibility values were obtained to provide a database for accurate values of hay and straw types produced in the Western Cape area of South Africa. Straw and hay samples were collected from 10 different localities in the... -
Physical and chemical properties associated with food quality in sorghum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. Geleta --- Department of Plant Sciences, South Africa M.T. Labuschagne --- Department of Plant Sciences, South Africa G. Osthoff --- Department of Microbial, Biochemical and Food Biotechnology, South Africa A. Hugo --- Department of Microbial, Biochemical and Food Biotechnology, South Africa C. Bothma --- Department of Microbial, Biochemical and Food Biotechnology, South AfricaSamples of 13 genetically diverse sorghum [Sorghum bicolor (L.) Moench] accessions were analysed for physical properties and chemical composition. The food (injera) quality and the phenolic (condensed tannins) content of six sorghum samples were also determined. The accessions showed a... -
Effects of Artemisia afra leaf extracts on seed germination of selected crop and weed species
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. Ammann --- Department of Agronomy, Republic of South Africa P.J. Pieterse --- Department of Agronomy, Republic of South AfricaHerbicide resistance in weeds is a phenomenon threatening sustainable cereal production in the winter rainfall region of South Africa. Every possible weed control measure that may be used to complement chemical weed control measures should be investigated. The effect of... -
Evaluation of selected herbicides for the control of European gorse (Ulex europaeus L) by cut-stump and foliar treatment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.D. Viljoen --- Agricultural Research Council, South Africa C.W. Stoltsz --- Agricultural Research Council, South AfricaEuropean gorse (Ulex europaeus L) is a persistent, declared weed (Category 1) of South Africa. Current distribution is limited to the moist, high altitude regions of the Drakensberg (KwaZulu Natal Province) and Amatola (Eastern Cape Province) mountains. Gorse poses a... -
Effect of the organo-trisiloxane surfactant, Break-Thru S240, on the depth of penetration of insecticides into maize whorls and chemical control of stem borers
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. van den Berg --- , South Africa D. Viljoen --- , South AfricaChemical control of the stem borers Busseola fusca (Lepidoptera: Noctuidae) and Chilo partellus (Lepidoptera: Pyralidae) is complicated because of cryptic feeding deep inside plant whorls where larvae do not easily come into contact with insecticides. In this study the effect... -
Reaction of South African soybean cultivars to rust caused by Phakopsora pachyrhizi
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.W. McLaren --- Centre for Plant Health Management, Department of Plant Sciences, South AfricaSoybean rust was recorded in South Africa in February 2001 in the Vryheid area of KwaZulu-Natal, from where it spread throughout production areas east of the escarpment. Management of the disease is presently, based on fungicide spray programs. Commercial soybean... -
Relationships between plant and soil nutrient status and position in the landscape on Pellic Vertisols of Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Lemma Gizachew --- , Ethiopia G.N. Smit --- Department of Animal, Wildlife and Grassland Sciences, South AfricaEffects of land use on soil nutrients and related soil parameters of Pellic Vertisols were assessed using soil samples collected from plots subjected to the cultivation of tef (Eragrostis tef) (TF) and grass pea (Lathyrus sativus) (GP) and native grassland... -
Soil properties changes after short-term livestock exclusion in “degraded” communally managed rangelands in the western Bophirima District, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. Moussa --- , South Africa L. Van Rensburg --- , South Africa K. Kellner --- , South AfricaLivestock grazing and detrimental overgrazing are commonly associated with severe rangeland degradation particularly in communally managed pastoral systems in South Africa. Effects of grazing exclusion on vegetation are well documented, but there is a dearth of quantitative research conducted in... -
The effect of the adjuvant, Break-Thru S240, on whorl penetration and efficacy of foliar insecticide applications against Chilo partellus
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: O. Slabbert --- , South Africa J. Van den Berg --- , South AfricaInsecticide sprays registered for the control of maize stem borers are all intended for whorl application. Chemical control of these pests is complicated by their cryptic feeding habit inside plant whorls. The aim of this study was to investigate whether... -
Herbicide resistance in weeds – a threat to effective chemical weed control in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.J. Pieterse --- Department of Agronomy,Apart from the last 40 to 50 years, weed control in crops has always been a labour-intensive and time-consuming mechanical practice. Relief came in the form of chemical compounds that could control weeds, in particular selective herbicides. The development of... -
Preliminary evaluation of soil-residual herbicides for the control of silver-leaf bitter apple (Solanum elaeagnifolium Cav.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.D. Viljoen --- , 6230 Republic of South Africa C.W. Stoltsz --- , 6230 Republic of South Africa M. van der Rijst --- , Republic of South AfricaSolanum elaeagnifolium Cav., commonly known as silver-leaf bitter apple, silverleaf nightshade or “satansbos”, has become one of the most important emerging weeds in South Africa, with the potential to spread throughout some of the major crop growing areas of the... -
Carbon and nitrogen mineralisation and inactivation of the Cry1Ab protein in Bt maize (MON810) residues during composting
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CK Daudu --- Department of Agronomy, South Africa P Muchaonyerwa --- School of Agricultural, Earth and Environmental Sciences, South Africa PNS Mnkeni --- Department of Agronomy, South AfricaA study was carried out to determine the effects of composting Bt maize residues on carbon (C) and nitrogen (N) contents and activity of the Cry1Ab protein in the compost. Residues (leaf plus stem) of mature Bt maize (DKC 7815B)... -
Phytochemical content, antioxidant capacity and physicochemical properties of pomegranate grown in different microclimates in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Asanda Mditshwa --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Faculty of AgriSciences, South Africa OlaniyiA Fawole --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Faculty of AgriSciences, South Africa Fahad Al-Said --- Department of Crop Sciences, College of Agricultural and Marine Sciences, Sultanate of Oman Rashid Al-Yahyai --- Department of Crop Sciences, College of Agricultural and Marine Sciences, Sultanate of Oman UmezuruikeL Opara --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Faculty of AgriSciences, South AfricaWe investigated the antioxidant and physicochemical properties of pomegranate (Punica granatum cv. Bhagwa) fruit grown in three microclimates in South Africa. The physicochemical properties of fruit peel and arils differed among the growing locations, including weight and redness color of... -
Identification and classification of vertical chlorophyll patterns in the Benguela upwelling system and Angola-Benguela front using an artificial neural network
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: N. F. Silulwane A. J. Richardson F. A. Shillington B. A. Mitchell-InnesInformation on the vertical chlorophyll structure in the ocean is important for estimating integrated chlorophyll a and primary production from satellite. For this study, vertical chlorophyll profiles from the Benguela upwelling system and the Angola-Benguela front were collected in winter... -
THE SUMMER CONDITION OF THREE EASTERN TRANSVAAL RESERVOIRS AND SOME CONSIDERATIONS REGARDING THE ASSESSMENT OF TROPHIC STATUS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , South Africa D.F. Toerien --- , South AfricaSummer temperature, oxygen and light penetration profiles in the Da Gama, Klipkopje and Witklip Reservoirs are presented. Analysis of waters from different depths showed the presence of chemical stratification despite the absence of clear thermal stratification. An algal bioassay procedure... -
HYDROCHEMISTRY OF THE UPPER ORANGE RIVER CATCHMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: PC Keulder --- Department of Botany, South AfricaA four year pre-impoundment study of the catchment of the Hendrik Verwoerd Dam was conducted. The Orange River was the major source of dissolved chemicals and suspended sediments, while the Caledon River contributed 24 and 30% respectively, and the Kraai... -
A PRELIMINARY LIMNOLOGICAL STUDY OF BUFFELSPOORT DAM AND ITS CATCHMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , D.F. Toerien --- ,A limnological survey of the Buffelspoort Dam and its catchment between 1973 and 1975 showed that the water of the area contained extremely low concentrations of dissolved minerals and that there was no point source of nutrient supply to the... -
THE INTERRELATIONSHIPS BETWEEN THE BIOLOGICAL AND PHYSICO-CHEMICAL PARAMETERS IN THE WATER PHASE OF SESHEGO DAM, NORTHERN TRANSVAAL
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Antoinette Jooste --- Department of Zoology and Biology, South AfricaSeshego Dam, Lebowa, was investigated over a period of 15 months (1974 – 1975). The interrelationships between biological parameters such as Biological Growth Potential (BGP), anaerobic fecal and coliform bacteria, Cladocera and Copepoda were established by means of factor and... -
ZOOPLANKTON AND ENVIRONMENTAL CONDITIONS IN GROENVLEI, SOUTHERN CAPE, DURING 1976
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.J. Coetzee --- Cape Department of Nature and Environmental Conservation, South AfricaThe zooplankton and environmental conditions in Groenvlei were studied during 1976 as part of an overall ecological study of the zooplankton of the Wilderness Lakes system. The Groenvlei water was found to be well mixed and low in dissolved PO4−P,... -
THE COMPOSITION OF WATER COLLECTED FROM THE KUISEB RIVER, NAMIB DESERT, AT GOBABEB
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: JohanU Grobbelaar --- , South Africa MaryK Seely --- , South AfricaWater from the Kuiseb River at Gobabeb varied in ionic content. Various ionic dominance orders were recorded from flooding until the pools dried up. The quality was not suitable for irrigation, but would present no problems when used by stock... -
A SYSTEM FOR SPRAYING CHEMICALS ON TO LAKE SURFACES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , South Africa M. Taylor --- , South Africa M.T. Seaman --- , South Africa -
ZOOPLANKTON AND ENVIRONMENTAL CONDITIONS IN A SOUTHERN CAPE COASTAL LAKE SYSTEM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.J. Coetzee --- Cape Department of Nature and Environmental Conservation, South AfricaThe usually natural closing and artificial opening of the Tow River mouth to the sea have a major influence on the physico-chemical environmental conditions in the coastal lake system formed by the Tow River, Eilandvlei, Langvlei and Rondevlei, as it... -
HYDROCLIMATE DEVELOPMENT FOLLOWING IMPOUNDMENT IN A TROPICAL AFRICAN MAN-MADE LAKE (LAKE ROBERTSON, ZIMBABWE)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: N.G. Cotterill --- Hydrobiology Research Unit, Zimbabwe J.A. Thornton --- Hydrobiology Research Unit, ZimbabweLake Robertson was impounded by the Darwendale Dam which was completed in late 1976 to supplement the water supply to the City of Harare, Zimbabwe. This paper presents the results of a fortnightly sampling programme conducted on the lake between... -
NOTES ON THE AVAILABILITY AND CHEMICAL COMPOSITION OF WATER FROM THE GRAVEL PLAINS OF THE NAMIB-NAUKLUFT PARK
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: O.B. Kok --- Department of Zoology, J.U. Grobbelaar --- Department of Zoology,Data are presented on the occurrence of a surprising number of permanent water sources on the gravel plains of the Namib-Naukluft Park, South West Africa. As a consequence, no game animal is further than ca 25 km away from the... -
ECOLOGICAL PROBLEMS IN HARTBEESPOORT DAM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: AndrewC. Jarvis --- National Institute for Water Research,In Hartbeespoort Dam ecological problems arise primarily as a consequence of the reservoir's hypertrophic condition. The development of anaerobic conditions, high primary productivity and blue-green algal dominance have many detrimental influences on ecosystem structure and function. With high rates of... -
Seasonal influence on diet selection of sheep grazing a weedy dryland lucerne pasture
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T.S. Brand F. Franck J. CoetzeeThe experiment was conducted to determine the seasonal effects on the availability, chemical composition and digestibility of a grazing dry-land lucerne pasture, as measured on samples either collected by hand or with oesophageally fistulated (OF) sheep. The pasture was monitored... -
Chemical composition and in vitro gas production of vetch (Vicia sativa) and some browse and grass species in northern Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G Berhane LO Eik A ToleraChemical composition and in vitro gas production of vetch (Vicia sativa) and some browse and grass species from northern Ethiopia were investigated. Vetch (fresh cut) was sampled in September and vetch hay samples were taken in October both during the... -
Condensed tannin in Eragrostis chloromelas leaves deters feeding by a generalist grasshopper
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J. Dini --- Department of Zoology, Republic of South Africa N. Owen‐Smith --- Department of Zoology, Republic of South AfricaWe investigated the feeding responses of a generalist grasshopper, the brown locust (Locusta pardalina), to leaves of the grass Eragrostis chloromelas differing in polyphenol content. For three specimens of E. chloromelas, the presence of condensed tannin in epidermal cells was... -
Effect of maturity stage and method of preservation on the yield and quality of babala
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: L.D. Snyman --- , South Africa H.W. Joubert --- , South AfricaThe effect of maturity stage on the total yield (all harvests throughout the season) of some forage components and on the chemical composition and in vitro dry matter digestibility (IVDMD) (first harvest) of babala, was investigated. The effects of various... -
Research note: A preliminary study of the root distribution of Commiphora pyracanthoides Engl. (BURSERACEAE) in the Sweet Bushveld of the Northern Province, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J.J. Jordaan --- , Republic of South Africa J.S. Swart --- , Republic of South Africa S. Venter --- , Republic of South AfricaThe root distribution of Commiphora pyracanthoides Engl., a potential encroaching woody species in the sweet bushveld areas of the Northern Province, South Africa, was studied at the Mara Agricultural Development Centre. The root system of ten C. pyracanthoides shrubs consisted... -
Research note: The silage characteristics of two varieties of forage sorghum mixed in different proportions and at two stages of maturity
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G. Ashbell --- Forage Preservation and By‐Products Research Unit, ARO, Israel Z.G. Weinberg --- Forage Preservation and By‐Products Research Unit, ARO, Israel K.K. Bolsen --- Department of Animal Sciences and Industry, United States Y. Hen --- Forage Preservation and By‐Products Research Unit, ARO, Israel A. Azrieli --- Forage Preservation and By‐Products Research Unit, ARO, IsraelTwo varieties of forage sorghum, low grain Dekalb FS‐5 (FS) and higher grain Pioneer 947 (GS) were harvested at the milk and dough stages of maturity respectively. Each variety was ensiled separately and as mixtures under laboratory conditions. The mixtures... -
Botanical composition, yield and nutritional quality of grassland in relation to stages of harvesting and fertiliser application in the highlands of Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Z Tessema --- Department of Animal Sciences, Ethiopia A Ashagre --- , Ethiopia M Solomon --- Debre Zeit Agricultural Research Centre, EthiopiaLivestock production contributes to the livelihoods of the Ethiopian people; however, the productivity of the livestock subsector in the highlands is low due to malnutrition. Therefore, this study assessed the botanical composition, dry matter (DM) yield, chemical composition and in... -
Bioaccumulation of selected inorganic substances in the tissue of Oreochromis shiranus from Bunda Dam, Malawi
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PP Mumba JW Banda E Kaunda C Ndamala G GhambiA study to assess and monitor the concentrations of sulphate, sodium, magnesium, calcium, chloride, iron and nitrate in Bunda Dam was carried out from May to November 1998. The same parameters, except nitrate and chloride, were also determined in the... -
The impact of land use on water quality of the Lwiro River, Democratic Republic of Congo, Central Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M BagalwaThe water quality of the Lwiro River, Democratic Republic of Congo (DRC), Central Africa, was investigated on a monthly basis from December 1999–October 2000, at six stations along a hydraulic gradient from source to mouth, to evaluate the impact of... -
Comparative analysis of the aquaculture potential of hybrid Tilapia zillii (male) × T. guineensis (female) (Teleostei: Cichlidae) in floating cages, cement tanks and earth ponds
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CélineSK Nobah Tidiani Koné Valentin N'Douba Jos Snoeks Gouli Gooré Bi EssetchiP KouamélanThe effect of three rearing systems, floating cages, cement tanks and earth ponds, on the growth rate, feeding efficiency and mortality rates of hybrid tilapia — Tilapia zillii (male) × T. guineensis (female) — was evaluated for 233 days. Fish... -
Temporal and spatial variability in macroinvertebrate community structure in relation to environmental variables in Ajijiguan Creek, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FO Arimoro --- , South Africa RB Ikomi --- Department of Animal and Environmental Biology, Nigeria IO Ajuzieogu --- Department of Animal and Environmental Biology, Nigeria FO Nwadukwe --- Department of Animal and Environmental Biology, NigeriaVariations in macrobenthic community structure in time and space along a pollution gradient were examined in a small Niger Delta creek in 2006–2007. Salinity fluctuated between fresh and mesohaline conditions with values ranging from 0.4 to 5.2, and conductivity ranged... -
Enzymatic activities as potential stress biomarkers of two substituted benzene compounds in Propsilocerus akamusi (Diptera: Chironomidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CW Cao --- Department of Forest Protection, People's Republic of China XP Li --- Department of Forest Protection, People's Republic of China SL Ge --- Department of Forest Protection, People's Republic of China LL Sun --- Department of Forest Protection, People's Republic of China ZY Wang --- Department of Forest Protection, People's Republic of ChinaChironomids are a globally distributed family of insects that can serve as biological indicators of environmental pollution. Substituted benzenes are a group of serious environmental pollutants and severely threaten biological and human health. In order to investigate potential stress biomarkers... -
The effects of fire on wetland structure and functioning
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DC Kotze --- School of Agriculture, Earth and Environmental Sciences, South AfricaFire is an extensively used wetland management tool in both tropical and temperate areas, but its effects on wetlands are not well understood. The purpose of this paper is to review the effects of fire on wetland hydrology, biogeochemical cycling... -
Metal contamination of sediments and fish from the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Pheiffer --- Unit for Environmental Sciences and Management, R Pieters --- Unit for Environmental Sciences and Management, JC van Dyk --- Department of Zoology, NJ Smit --- Unit for Environmental Sciences and Management,Mining and other economic activities have led to the pollution of the Vaal River with metals of mainly industrial origin, but the consequences of this for animal and human health are unknown. Based on chemical analysis and histological examination, we... -
A symbiotic shell-encrusting bryozoan provides subtidal whelks with chemical defence against rock lobsters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Gray CD McQuaid MT Davies-ColemanThe subtidal whelk Burnupena papyracea co-occurs with a voracious predator, the rock lobster Jasus lalandii, in situations where other potential prey are largely eliminated. The survival of B. papyracea has been ascribed to a symbiotic bryozoan, Alcyonidium nodosum, which characteristically... -
Exploring basic biochemical constituents in the body tissues of South African abalone Haliotis midae reared in shore-based mariculture systems
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Laas --- Medical Research Council of South Africa, South Africa A Vosloo --- School of Environmental Science and Development, South AfricaThe study quantifies the effects of season, age and feeding regime on glucose, glycogen, proteins and lipids in abalone Haliotis midae tissues, and to assess water loss during simulated live export. Abalone of two age classes, younger (∼30 months old)... -
Algal communities associated with aquatic macrophytes in some artificial ponds in Nyando District, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Balthazar Mpawenayo Christine CocquytThis study describes the algal communities of six ponds colonised by aquatic macrophytes in Nyanza Province, Kenya. Plankton samples were collected from the water column and epiphytic samples from macrophytes such as Azolla, Pistia, Nymphaea, Ipomoea and Ludwigia. Pond pH,... -
Composition, abundance, distribution and seasonality of larval fishes in the Mngazi Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: P Pattrick NA Strydom TH WooldridgeWe investigated the larval fish assemblage in the intermittently-open Mngazi Estuary, in the subtropical/warm-temperate biogeographic boundary region of South Africa. Larvae were collected by means of boat-based plankton tows in summer and winter for a period of three years between... -
Trends analysis relating to pollution in Sakumo Lagoon, Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ruby Asmah Hedrick Dankwa CA Biney CC AmankwahSakumo Lagoon, situated near Accra, is a Ramsar-listed coastal wetland threatened by urban and agricultural waste, being located in an urban area where access to domestic and waste disposal facilities is a major problem. The aim of this study was... -
Preliminary assessment of oestrogenic activity in water sources in Rietvlei Nature Reserve, Gauteng, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NH Aneck-Hahn MS Bornman C de JagerA preliminary assessment was made of oestrogenic activity in water sources in the Rietvlei Nature Reserve, from which water is supplied to the metropolitan area of Pretoria. Single samples were extracted from seven sites using a solid phase C18 cartridge... -
Haematological characteristics of African bony tongue, Heterotis niloticus (Teleostei: Arapaimidae), in south-western Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Ayotunde OA Fagbenro BO OffemHaematological characteristics — including red and white blood cells counts, haemoglobin, haematocrit, mean cell haemoglobin concentration, mean cell volume, mean cell haemoglobin, protein, glucose, albumin, sodium, chloride, potassium, magnesium and phosphorus — were established from an examination of 25 adult... -
Exploring differences of soil quality as related to management in semiarid rangelands in the western Bophirima District, North West province, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AS Moussa L van Rensburg K Kellner A BationoDifferences in land-use management may result in different rangeland condition (soil, vegetation and biodiversity) and productivity. Vegetation condition in contrasting land-use management systems is well documented in semiarid rangelands, but relatively little information is available on soil quality. This study... -
A note on the potential nutritive value of Ziziphus mucronata (buffalo thorn) foliage during different seasons
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Abubeker Hassen --- Department of Animal and Wildlife Science, South Africa NFG Rethman --- Department of Plant Production and Soil Science, South Africa WA van Niekerk --- Department of Animal and Wildlife Science, South AfricaFoliage of Ziziphus mucronata (buffalo thorn) was collected during the spring, summer and autumn. The chemical composition and in vitro digestibility of organic matter (IVDOM) of these samples were determined. Crude protein concentration ranged between 123–262 g kg DM−1, and... -
Energy, chemicals and carbon: future options for the Eucalyptus value chain
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: S ChristieThis paper examines the current Eucalyptus value chain and the possible drivers that may impact upon it. The potential consequences of climate change on the growth and yield of Eucalyptus are discussed and the impact of the security of oil... -
Steroid hormone concentrations and physiological toxicity of water from selected dams in Namibia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AK Faul --- Department of Biological Sciences, Namibia E Julies --- Department of Biological Sciences, Namibia EJ Pool --- Department of Medical Biosciences, South AfricaNamibia is a semi-arid to arid country and has most of its surface water in dams built on ephemeral rivers. Whilst water quality is often measured in terms of bacterial contamination and general physico-chemical characteristics, this study extends water quality... -
Marijuana use in Pregnancy: Anaesthetic Implications
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: KM Kuczkowski --- Departments of Anesthesiology and Reproductive Medicine, -
Lithostructural framework and rare metal (Ta-Nb-Sn-Li-Be) mineralisation in lepidolite from the Ijero-Aramoko pegmatite field, south-western Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Oluwatoyin O Akinola --- Department of Geology, NigeriaA lithological framework and petrochemical features relating to Ta-Nb-Sn-Li-Be mineralisation in lepidolite from the Ijero-Aramoko pegmatite field, south-western Nigeria were investigated. Systematic geological mapping revealed that the pegmatite occurs as steeply inclined intrusive bodies in a basement of gneisses and... -
Water quality dynamics in the Boro-Thamalakane-Boteti river system, northern Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Tubatsi --- Okavango Research Institute, Botswana MC Bonyongo --- Okavango Research Institute, Botswana M Gondwe --- Okavango Research Institute, BotswanaThe quality of water in aquatic systems is subject to temporal and spatial variations due to varying effects of natural and anthropogenic factors. This study assessed the dynamics of water quality in the Boro-Thamalakane-Boteti river system along an upstream–downstream gradient... -
Spatio-temporal variation in density of microphytoplankton genera in two tropical coral reefs of Mauritius
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SB Sadally --- Department of Biosciences, Faculty of Science, Mauritius N Taleb-Hossenkhan --- Department of Biosciences, Faculty of Science, Mauritius R Bhagooli --- Department of Biosciences, Faculty of Science, MauritiusSpatial and temporal (seasonal and interannual) variation in microphytoplankton was investigated at two tropical coral reef sites off Mauritius (Belle Mare [BM] and Flic-en-Flac [FEF]), from 2010 to 2012. Each site was divided into three zones: coast, lagoon and reef... -
Differential effects of thermal and chemical stressors on tissue balls from scleractinian corals
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Mattan-Moorgawa --- Department of Biosciences, Faculty of Science, Mauritius G Poonet --- Department of Biosciences, Faculty of Science, Mauritius R Bhagooli --- Department of Biosciences, Faculty of Science, Mauritius S Rughooputh --- Department of Physics, Faculty of Science, MauritiusCoral cell aggregates (tissue balls) from four species (Acropora muricata, Fungia repanda, Pavona cactus and Pocillopora damicornis) were used as an indicator to investigate the effects on the corals of thermal stress and of chemical extracts from three sponges (Adocia... -
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... -
Foraging mode of a group-living lizard, Cordylus cataphractus (Cordylidae)
Item type: Journal Article • Journal: African Zoology • Authors: P. le --- Department of Zoology, South Africa F.N. Mouton --- Department of Zoology, South Africa H. Geertsema --- Department of Entomology & Nematology, South Africa L. Visagie --- Department of Zoology, South AfricaCordylus cataphractus is a group-living lizard endemic to the dry western regions of southern Africa. Groups of up to 30 individuals are regularly encountered and, if this species is a sit-and-wait forager like other members of its family, competition for... -
Dynamics of recruitment of larval and juvenile Cape stumpnose Rhabdosargus holubi (Teleostei: Sparidae) into the Swartkops and Sundays estuaries, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Y Kisten --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa P Pattrick --- Department of Zoology, South Africa NA Strydom --- Department of Zoology, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaRecruitment of early life stages into estuaries is an integral part of the life cycle of many marine fish species. Although estuaries are naturally environmentally dynamic, they also are subject to anthropogenic disturbances, including land use and climate change, which... -
The Effects of Phosphate Fertilizers and Manure on Maize Yields in South Western Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: J. S. Ademba --- Kenya Agricultural Research Institute (KARI) Kisii, Kenya J. K. Kwach --- Kenya Agricultural Research Institute (KARI) Kisii, Kenya A. O. Esilaba --- Kenya Agricultural Research Institute (KARI) Headquarters, Kenya S. M. Ngari --- Egerton University, KenyaPhosphorus, nitrogen and Striga hermonthica are the major constraints to maize production in the Nyanza Province of Kenya. Field trials were conducted on-farm in Nyanza Province to investigate the effects of phosphate fertilizers and manure on maize yields. The experimental... -
Seasonal variations in diet selection of Nguni goats: effects of physical and chemical traits of browse
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Sylvester W Fomum --- Department of Animal and Poultry Sciences, School of Agriculture, Earth and Environmental Sciences, South Africa Peter F Scogings --- Department of Agriculture, South Africa Luthando Dziba --- CSIR, South Africa Ignatius V Nsahlai --- Department of Animal and Poultry Sciences, School of Agriculture, Earth and Environmental Sciences, South AfricaGoats select some browse species more than others, given options. Seasonal trends of diet selection of Nguni goats indexed by intake were investigated in cafeteria-style experiments. The relationships between diet selection and plant chemical/physical traits of Vachellia nilotica, Vachellia robusta,... -
Prey, but not plant, chemical discrimination by the lizard Gerrhosaurus nigrolineatus
Item type: Journal Article • Journal: African Zoology • Authors: William E. Cooper --- Department of Biology,, U.S.A Jason J. Habegger --- Department of Biology,, U.S.AWe experimentally studied responses to food chemicals by Gerrhosaurus nigrolineatus, a member of a lizard genus endemic to subsaharan Africa. Gerrhosaur diets vary from insectivorous to omnivorous with a very large plant portion. The omnivorous G. validus responds strongly to... -
Foraging mode of serpentiform, grass-living cordylid lizards: a case study of Cordylus anguina
Item type: Journal Article • Journal: African Zoology • Authors: A. du Toit --- Department of Zoology, South Africa P. le F.N. Mouton --- Department of Zoology, South Africa H. Geertsema --- Department of Entomology and Nematology, South Africa A.F. Flemming --- Department of Zoology, South AfricaForaging mode of the Cape grass lizard, Cordylus anguina, was determined by using three criteria: 1) the number of movements per minute (MPM) and the percentage of time spent moving (PTM) during periods of activity; 2) prey chemical discrimination ability;... -
Validation of growth zone deposition in otoliths of two large endemic cyprinids in Lake Gariep, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Henning Winker --- Department of Ichthyology and Fisheries Science, South Africa Bruce R. Ellender --- Department of Ichthyology and Fisheries Science, South Africa Olaf L.F. Weyl --- South African Institute for Aquatic Biodiversity, South Africa Anthony J. Booth --- Department of Ichthyology and Fisheries Science, South AfricaWe tested the hypothesis that growth zones in the astericus otoliths of smallmouth yellowfish (Labeobarbus aeneus) and Orange River mudfish (Labeo capensis) were deposited annually. Two methods, fluorochrome marking and edge analysis of otoliths were used. For fluorochrome marking, specimens... -
Antioxidant content and phytochemical properties of apple ‘Granny Smith’ at different harvest times
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Asanda Mditshwa --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Horticultural Sciences, Faculty of AgriSciences, South Africa Filicity Vries --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa Kobus van der Merwe --- Agricultural Research Council Infruitec-Nietvoorbij, South Africa Elke Crouch --- Department of Horticultural Sciences, Faculty of AgriSciences, South Africa Umezuruike Linus Opara --- Postharvest Technology Research Laboratory, South African Research Chair in Postharvest Technology, Department of Horticultural Sciences, Faculty of AgriSciences, South AfricaUnderstanding the biochemical composition of fruit to be stored could be used as a tool for planning postharvest management to maintain quality and reduce losses of fresh fruit. This study evaluated the effects of harvesting fruit seven days before (H1)... -
Surface water quality in the Okavango Delta panhandle, Botswana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DT West --- Department of Zoology and Entomology, South Africa JG van As --- Department of Zoology and Entomology, South Africa LL van As --- Department of Zoology and Entomology, South AfricaThe Okavango Delta, a Ramsar and a World Heritage Site, is an important source of food and water in the Kalahari Desert of southern Africa. Although the eastern delta fan is a protected area, the rest, including the upstream panhandle,... -
Chemical and thermal ocular burns: a review of causes, clinical features and management protocol
Item type: Journal Article • Journal: South African Family Practice • Authors: Khathutshelo Mashige --- School of Health Sciences, South AfricaChemical and thermal ocular burns are among the most urgent ophthalmic emergencies, often resulting in permanent damage, and in some cases, blindness. These burns are the result of exposure to chemicals or radiant energy (thermal or ultraviolet). The most serious... -
Health assessment of freshwater fish species from Albasini Dam, outside a DDT-sprayed area in Limpopo province, South Africa: a preliminary study
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UMC Nibamureke --- Department of Zoology, South Africa IEJ Barnhoorn --- Department of Zoology, South Africa GM Wagenaar --- Department of Zoology, South AfricaDuring 2006 to 2008, the water, sediment and fish in Albasini Dam, used as a reference site outside a DDT-sprayed area, had been found to be as affected as those in the nearby DDT-sprayed area were. Accordingly, the aim of... -
Effect of integrated soil bunds on key soil properties and soil carbon stock in semi-arid areas of northern Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Birhane Tadesse --- Natural Resource Management, Bureau of Agriculture and Rural Development, Ethiopia Shimbahri Mesfin --- Department of Land Resource Management and Environmental Protection, Ethiopia Girmay Tesfay --- Department of Natural Resource Economics and Management, Ethiopia Fetien Abay --- Department of Dryland Crop and Horticultural Science, EthiopiaLand degradation is a serious global problem. To reclaim degraded land, many soil bunds have been implemented. However, their effectiveness has not been studied in all regions of Ethiopia. The objective of this study was to investigate the effect of... -
Water quality of the Luvuvhu River and its tributaries within the Thulamela Local Municipality, Limpopo Province, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mpho Monyai --- Department of Environmental Sciences, South Africa Rudzani A. Makhado --- Department of Environmental Sciences, South Africa Ntshenge O. Novhe --- Council for Geoscience, South AfricaThe study was conducted during dry and wet periods at the Luvuvhu River and its tributaries within the Thumalamela Local Municipality, Limpopo Province, South Africa. A total of 50 samples (25 per sampling session) were collected for physicochemical analysis at... -
Is there a trade-off in resource allocation to condensed tannins and thorn defences in Vachellia (Acacia) species?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Allan Sebata --- Department of Forest Resources and Wildlife Management, ZimbabweAcacia species invest in condensed tannins (CT) and thorn defences among others. Plant defences are considered costly because they use resources that would otherwise be available for growth and reproduction. To reduce plant defence costs it has been argued that... -
Effect Of Replacing Fish Meal With Blood Meal On Chemical Composition Of Supplement For Nile Tilapia (Oreochromis Niloticus)
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: J. G. Kirimi --- State Department of Fisheries, Kenya L. M. Musalia --- Department of Animal Sciences, Kenya J. M. Munguti --- Kenya Marine and Fisheries Research Institute (KMFRI)-Sagana, KenyaThe objective of the work was to evaluate the effect on the nutrient content of replacing fish meal (FM) with blood meal (BM) in fish supplement. Three isonitrogenous diets (35% crude protein) were formulated using FM as the main source... -
Growth and nutritional qualities of three ocimum species as affected by methods of propagation
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: A. I. Okunlola --- Department of Crop, Soil and Pest Management, Nigeria O. C. Ogungbite --- Department of Biology, Nigeria G. F. Hassan --- Department of Crop, Soil and Pest Management, NigeriaOcimum species are well known for their medicinal values and this has increased demand from individuals and the pharmaceutical industry. In order to meet the demand for this plant species three different Ocimum species (Ocimum basilicum, Ocimum gratissimum and Ocimum... -
Nutritional quality of baby spinach (
Spinacia oleracea L. ) as affected by nitrogen, phosphorus and potassium fertilisationItem type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Bongekile O Zikalala --- Department of Agriculture and Animal Health, South Africa Mpumelelo Nkomo --- Department of Agriculture and Animal Health, South Africa Hintsa Araya --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Wonder Ngezimana --- Marondera College of Agricultural Sciences and Technology, Zimbabwe Fhatuwani N Mudau --- Department of Agriculture and Animal Health, South AfricaBaby spinach is a nutritious vegetable rich in phytochemicals and minerals. Cultural practices such as fertilisation have an impact on the nutritional composition of vegetables. Hence, the current study investigated the responses of the chemical composition of baby spinach to... -
The mechanisms behind environmental strategies in chemical manufacturing firms
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Keshminder Singh --- Faculty of Business and Management, Malaysia VGR Chandran --- Faculty of Economics and Administration, Department of Development Studies, Malaysia Santha Chenayah Ramu --- Faculty of Economics and Administration, Department of Economics, MalaysiaThe evaluation of an effective environmental strategy goes beyond understanding its antecedents and benefits. Identifying and understanding the various mechanisms behind the formulation, design and implementation of environmental strategies is important – yet past studies have not adequately addressed this... -
The abundance of an invasive freshwater snail Tarebia granifera (Lamarck, 1822) in the Nseleni River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RW Jones --- Department of Zoology and Entomology, South Africa JM Hill --- Department of Zoology and Entomology, South Africa JA Coetzee --- Department of Botany, South Africa TS Avery --- Department of Biology and Mathematics & Statistics, Canada OLF Weyl --- Centre for Invasion Biology, South Africa MP Hill --- Department of Zoology and Entomology, South AfricaThe invasive freshwater snail Tarebia granifera (Lamarck, 1822) was first reported in South Africa in 1999 and it has become widespread across the country, with some evidence to suggest that it reduces benthic macroinvertebrate biodiversity. The current study aimed to... -
Macroinvertebrate functional organisation along the longitudinal gradient of an austral temperate river
Item type: Journal Article • Journal: African Zoology • Authors: Sydney Moyo --- Department of Zoology and Entomology, South Africa Nicole B Richoux --- Department of Zoology and Entomology, South AfricaThe Kowie River, a relatively pristine system in South Africa, was sampled on four occasions over one year to determine if relative abundances of functional feeding groups (FFGs) of invertebrates changed along the longitudinal gradient, and if these changes matched... -
Water quality assessment of the Siluko River, southern Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IP Oboh --- Department of Animal and Environmental Biology, Faculty of Life Sciences, Nigeria CS Agbala --- Department of Animal and Environmental Biology, Faculty of Life Sciences, NigeriaThe water quality of the Siluko River, Edo State, Nigeria was investigated from March to August 2015 to determine its suitability for drinking and usage for domestic purposes. Water samples collected from three stations were tested for thirteen physico-chemical parameters... -
Modelling the impacts of semi-intensive aquaculture on the foodweb functioning of a Nile Delta coastal lake
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Bocci --- Department of Environmental Sciences, Informatics and Statistics, Italy R Pastres --- Department of Environmental Sciences, Informatics and Statistics, Italy S Kholeif --- National Institute of Oceanography and Fisheries (NIOF), Egypt D Dalla Barba --- Department of Environmental Sciences, Informatics and Statistics, Italy D Brigolin --- Department of Environmental Sciences, Informatics and Statistics, ItalyNutrient loadings are an important component of aquaculture impacts as they can lead to cascade effects at the ecosystem level. An evaluation of these effects on foodweb functioning is presented and discussed for the case study of Lake Burullus in... -
Occurrence of oestrogenic pollutants and widespread feminisation of male tilapia in peri-urban dams in Bulawayo, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: C Teta --- Department of Environmental Science and Health, Zimbabwe; Current address: Department of Ichthyology and Fisheries Science, Rhodes University, Grahamstown, South Africa BF Holbech --- Institute of Biology, University of Southern Denmark, Denmark L Norrgren --- Department of Pathology, Faculty of Veterinary Medicine, Sweden YS Naik --- Research and Innovation, ZimbabwePeri-urban water bodies are at risk from excessive pollution as they are direct sinks for urban effluents. The occurrence of oestrogenic and androgenic endocrine disrupting chemicals (EDCs) in effluents and water bodies around the city of Bulawayo, Zimbabwe, and their... -
Effects of urea addition on the fermentation of sorghum (Sorghum bicolor) silage
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Ana Paula Maia dos Santos --- Programa de Pós-Graduação em Zootecnia, Brazil Edson Mauro Santos --- Programa de Pós-Graduação em Zootecnia, Brazil Juliana Silva de Oliveira --- Programa de Pós-Graduação em Zootecnia, Brazil Ossival Lolato Ribeiro --- Universidade Federal do Recôncavo da Bahia, Brazil Alexandre Fernandes Perazzo --- Bolsista DCR/FAPESB/CNPq, Brazil Ricardo Martins Araújo Pinho --- Programa de Pós-Graduação em Zootecnia, Brazil Alberto Jeferson da Silva Macêdo --- Programa de Pós-Graduação em Zootecnia, Brazil Gildenia Araújo Pereira --- Programa de Pós-Graduação em Zootecnia, BrazilThis study was conducted to evaluate the effects of urea addition on fermentation characteristics, losses and chemical composition of silage of sorghum (Sorghum bicolor) ‘BRS Ponta Negra’. The sorghum plant was chopped and treated with different levels of urea (0.1756,... -
A novel system dynamics’ model for the motors of a sectoral innovation system–simulating and policymaking
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sayyed Mohsen Azad --- Department of Industrial Engineering, Iran Seyed Hassan Ghodsypour --- Department of Industrial Engineering, IranIn recent years, science and technology policymaking has been taken into consideration by many researchers. One of the most important fields of this policymaking is innovation systems’ management; which is divided into national, regional, sectoral and technological innovation systems. In... -
Occurrence and distribution of organochlorine pesticide residue levels in water, sediment and aquatic weeds in the Nyando River catchment, Lake Victoria, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DA Abong’o --- College of Biological and Physical Sciences, School of Physical Science, Department of Chemistry, Kenya SO Wandiga --- College of Biological and Physical Sciences, School of Physical Science, Department of Chemistry, Kenya IO Jumba --- College of Biological and Physical Sciences, School of Physical Science, Department of Chemistry, KenyaSamples of water, sediments and aquatic weeds were collected from 26 sites in the Nyando River catchment of the Lake Victoria basin in 2005–2006. The objective was to investigate levels of organochlorine pesticides that have either been banned or are... -
Biomarkers of toxicity in Clarias gariepinus exposed to sublethal concentrations of polycyclic aromatic hydrocarbons
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TO Sogbanmu --- Ecotoxicology and Conservation Unit, Department of Zoology, Faculty of Science, Nigeria AO Osibona --- Department of Marine Sciences, Faculty of Science, Nigeria OA Oguntunde --- Department of Anatomic and Molecular Pathology, Faculty of Basic Medical Sciences, Nigeria AA Otitoloju --- Ecotoxicology and Conservation Unit, Department of Zoology, Faculty of Science, NigeriaPhysiological, biochemical and histological indices in Clarias gariepinus broodstock, and teratogenic indices in embryos exposed to sublethal concentrations of naphthalene, phenanthrene and pyrene were investigated in 2014 using a static-renewal bioassay protocol. Phenanthrene (1.41 mg l−1) was the most toxic,... -
An overview of pedogenesis in Technosols in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Angelique Daniell --- Unit for Environmental Science and Management, South Africa Pieter W van Deventer --- Unit for Environmental Science and Management, South AfricaTechnosols are soils dominant in technical artifacts, formed from anthropogenic deposits or transported materials. While anthropogenic in origin, it is clear that pedogenic processes are active within Technosols, i.e. transformation and translocation of elements, minerals and particles within these materials... -
Chemical characteristics of woods from several Chilean native forest species and their relationship with nanomechanical cell properties
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: María Graciela Aguayo --- Centro de Biomateriales y Nanotecnología, Chile William Gacitúa --- Centro de Biomateriales y Nanotecnología, Chile Paulina Valenzuela --- Centro de Biomateriales y Nanotecnología, Chile Regis Teixeira Mendonça --- Laboratorio de Recursos Renovables, Centro de Biotecnología, Chile Pablo Reyes --- Centro de Excelencia en Nanotecnología, Fundación Leitat Chile, ChileThe objective of this research was to study the chemical and nanomechanical characteristics of native woods grown in southern Chile region. The species analysed were Drimys winteri, Laureliopsis philippiana, Aextoxicon puctatum, Nothofagus alpina, Nothofagus dombeyi, Laurelia sempervirens, Austrocedrus chilensis and... -
Long-term physico-chemical and faunal changes in a small, rural South African estuary
Item type: Journal Article • Journal: African Zoology • Authors: M Kajee --- Department of Biological Sciences and Centre for Invasion Biology, South Africa CL Griffiths --- Department of Biological Sciences and Centre for Invasion Biology, South Africa SJ Lamberth --- Fisheries Management, Department of Agriculture, South AfricaThe Palmiet Estuary is a small, rural estuary in the Western Cape that only closes briefly during dry summers. The system was previously surveyed during 1979 to 1980 and we repeated the survey in April 2015 (mouth closed) and September... -
Remediation of salt-affected soil by natural and chemical amendments to improve berseem clover yield and nutritive quality
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Zainab Mohamed Abd El-Naby --- Forage Research Department, Egypt Wafaa Abd El-Karim Hafez --- Soil, Water and Environment Research Institute, Agriculture Research Center, Egypt Hanan Ahmed Hashem --- Botany Department, Faculty of Science, EgyptSalinity is a major problem affecting crop production worldwide. The potential of different soil amendments (sulphur, gypsum, compost, and combination of gypsum, compost and sulphur) and two plant-growth stimulators (potassium silicate and calcium carbonate nanoparticles) to alleviate the harmful effects... -
Review of anthropogenic threats and biodiversity assessment of an Ethiopian soda lake, Lake Abijata
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Wagaw --- Department of Biology, Ethiopia S Mengistou --- Department of Zoological Sciences, Ethiopia A Getahun --- Department of Zoological Sciences, EthiopiaThe intention of this review is to assess the impact of anthropogenic activities on the biodiversity of Lake Abijata. The lake was established as a National Park, together with Lakes Shalla and Chitu, to conserve water birds. It has high... -
Seasonal and successional patterns of phytoplankton in Epe Lagoon, Lagos, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OA Kunrunmi --- Department of Botany, Nigeria TA Adesalu --- Department of Botany, NigeriaVariations in phytoplankton species abundance and composition are regulated by changes in physico-chemical factors. A study of biodiversity and successional sequences was carried out monthly from November 2012 to April 2014 to determine the environmental factors controlling phytoplankton assemblages in... -
Eutrophication of Ethiopian water bodies: a serious threat to water quality, biodiversity and public health
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Fetahi --- Aquatic Ecology, EthiopiaFreshwater ecosystems provide several ecological and economic services. However, these ecosystems in Ethiopia are deteriorating, because of economic growth, unwise use and pollution (eutrophication). This paper reviews existing trends of eutrophication in Ethiopian water bodies, identifies principal sources of nutrient... -
Oxygen and temperature influence the distribution of deepwater Cape hake Merluccius paradoxus in the southern Benguela: a GAM analysis of a 10-year time-series
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: FL Mbatha --- Department of Biological Sciences and Marine Research Institute, South Africa D Yemane --- Department of Biological Sciences and Marine Research Institute, South Africa M Ostrowski --- Institute of Marine Research (IMR), Norway CL Moloney --- Department of Biological Sciences and Marine Research Institute, South Africa MR Lipiński --- Department of Ichthyology and Fisheries Science, South AfricaGeneralised additive models (GAMs) were applied to survey data to assess the influence of dissolved oxygen, water temperature and year of sampling upon the presence/absence of small (≤15 cm TL), medium (16–34 cm TL) and large (≥35 cm TL) size... -
Nutritional values and chemical composition of tropical pastures as potential sources of α-tocopherol and condensed tannin
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jalise F Tontini --- Graduate Program in Animal Science, Agronomy College, Brazil Cesar HEC Poli --- Graduate Program in Animal Science, Agronomy College, Brazil Viviane S Hampel --- Graduate Program in Animal Science, Agronomy College, Brazil Alessandro P Minho --- Embrapa Southeast Livestock, Brazilian Agricultural Research Corporation, Ministry of Agriculture, Brazil James P Muir --- Texas AgriLife Research, USATropical pastures can be important natural sources of antioxidant compounds and may impact production and quality of animal protein with repercussions on human health. The objective of this study was to evaluate the concentrations of α-tocopherol, condensed tannin (CT) and... -
Optimising the dosage of ethyl methanesulphonate mutagenesis in selected wheat genotypes
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Boluwatife M Olaolorun --- School of Agricultural, Earth and Environmental Sciences, South Africa Hussein A Shimelis --- School of Agricultural, Earth and Environmental Sciences, South Africa Isack Mathew --- School of Agricultural, Earth and Environmental Sciences, South Africa Mark D Laing --- School of Agricultural, Earth and Environmental Sciences, South AfricaNarrow genetic variation limits the success of crop improvement programs. Mutagenesis using ethyl methane- sulphonate (EMS) provides an opportunity to increase genetic variation to enhance selection in wheat improvement. This study aimed at establishing the optimum dosage and treatment conditions... -
Phytochemical screening and antimicrobial investigation of Moringa oleifera leaf extracts
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Oluwole Solomon Oladeji --- Department of Physical Sciences, Faculty of Pure and Applied Sciences, PMB 1001, Km 4, Ipetu Road, Omu-Aran, Kwara State, Nigeria Kehinde Abraham Odelade --- Department of Microbiology, Faculty of Natural and Agricultural Sciences, Private Bag X2046, Mmabatho 2735, South Africa Julius Kola Oloke --- Department of Pure and Applied Biology, PMB 4000, Ogbomoso, Oyo State, NigeriaPhytochemical screening and antimicrobial analysis of Moringa oleifera leaf collected from Ogbomoso, Nigeria were carried out. The secondary metabolites in M. oleifera leaf were extracted by maceration using chloroform, ethyl acetate and ethanol. Some important bioactive compounds or metabolites in... -
Macrobenthic community structure of the Mhlathuze Estuary, a permanently open estuarine embayment in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JI Izegaegbe --- Department of Zoology, South Africa L Vivier --- Department of Zoology, South Africa HMM Mzimela --- Department of Zoology, South AfricaThe Mhlathuze Estuary, an estuarine embayment in northern Zululand, is considered an estuary of national conservation importance. No historical data on the benthic macrofauna are available for the past 20 years, creating a significant gap in our understanding of the... -
Playing with food: Detection of prey injury cues stimulates increased functional foraging traits in Xenopus laevis
Item type: Journal Article • Journal: African Zoology • Authors: Josie South --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South Africa Tarryn L Botha --- Unit for Environmental Sciences and Management, South Africa Nico J Wolmarans --- Unit for Environmental Sciences and Management, South Africa Victor Wepener --- Unit for Environmental Sciences and Management, South Africa Olaf LF Weyl --- DST/NRF Research Chair in Inland Fisheries and Freshwater Ecology, South AfricaAnimal behavioural traits determine trophic interaction strength, which in turn structures ecological communities. Behavioural responses to prey cues can inform upon how prey are perceived and detected and therefore determine whether certain stimuli can increase or dampen predatory efficiency and... -
Methods of storing cactus pear genotypes for animal feeding
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Chrislanne Barreira de Macêdo Carvalho --- , Brazil Ricardo Loiola Edvan --- , Brazil Keuven dos Santos Nascimento --- , Brazil Romilda Rodrigues do Nascimento --- , Brazil Leilson Rocha Bezerra --- , Brazil Darkle Luiza de Souza Jácome --- , Brazil Viviany Lúcia Fernandes dos Santos --- , Brazil Hermógenes Almeida de Santana Júnior --- , BrazilThe objective of this study was to evaluate storage methods of cactus pear as a way of conservation for use in animal feeding. The randomised experimental design composed twelve treatments and three replications. Three cactus pear genotypes, Nopalea cochenillifera genotype... -
Relationships between farmer perceptions and temporal variation in nutritive value of browse species on savanna rangelands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Clarice P Mudzengi --- , Zimbabwe Amon Murwira --- , Zimbabwe Tinyiko Halimani --- , Zimbabwe Herve Fritz --- , France Chrispen Murungweni --- , ZimbabweIn livestock-based livelihoods of the developing world, determination of the nutritive value of browse species is mainly associated with farmer perceptions. Additionally, little is known on seasonal variation in nutritive value of these species in some areas. Therefore, chemical analysis... -
Assessment of physico-chemical parameters of freshwater in the Sidi Abderrahmane reservoir, Safi, Morocco
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Belokda --- , Morocco Z Damsiri --- , Morocco L Natij --- , Morocco K Khalil --- , Morocco M Loudiki --- , Morocco A Dahbi --- , Morocco H Achtak --- , Morocco J Richir --- , Belgium B Sabour --- , Morocco K Elkalay --- , MoroccoThe purpose of the study was to assess the water quality in the Sidi Abderrahmane freshwater reservoir (Safi, Morocco). The monitoring data used in the study included physical, chemical, and biological characteristics. The spatial and temporal characteristics of these parameters... -
Biomarker responses in African sharptooth catfish, Clarias gariepinus (Burchell, 1822), as indicators of potential metal and organic pollution along the Vaal River system, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LJ Connell --- , South Africa GR Jansen van Rensburg --- , South Africa A Avenant-Oldewage --- , South Africa R Greenfield --- , South AfricaThe Vaal River is of considerable economic and environmental importance. It flows through five provinces within South Africa and it is subject to numerous recreational and industrial activities, which often prove detrimental to the health of the system. To determine... -
Threats posed by xenoestrogenic chemicals to the aquatic ecosystem, fish reproduction and humans: a review
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: I Badamasi --- , Uganda R Odong --- , Uganda C Masembe --- , UgandaXenoestrogens mimic and interfere with natural functions of oestrogens and adversely affect fish reproduction. Pesticides, plastics, wastewaters and pharmaceuticals are sources of xenoestrogens, and are carried through surface runoffs to water bodies at concentration levels that are harmful to aquatic... -
Farmer knowledge, attitude and practices on sorghum allelopathy in five sorghum producing districts of Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H Tibugari --- , South Africa C Chiduza --- , South Africa AB Mashingaidze --- , ZimbabweLack of knowledge about allelopathy technology may be a barrier to the adoption of allelopathy by farmers. A questionnaire survey together with physical weed sampling in farmers’ fields were conducted to examine farmer knowledge, attitude and practices on sorghum allelopathy... -
Spatial variation of nutrients and primary productivity in the Rufiji Delta mangroves, Tanzania
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Minu --- , Tanzania J Routh --- , Sweden JF Machiwa --- , Tanzania S Pamba --- , TanzaniaDeterminations of spatial and temporal variations in organic matter and nutrient dynamics in water and sediments are crucial for understanding changes in aquatic bodies. In this study, we (i) determine the spatial dynamics of dissolved inorganic nutrients, during the transition... -
Physico-chemical limnology during the filling phase of Tugwi-Mukosi, a tropical reservoir in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- , Harare TC Madzivanzira --- , Zimbabwe T Nhiwatiwa --- , Harare P Tendaupenyu --- , Harare M Barson --- , Harare L Marufu --- , Harare N Songore --- , ZimbabweThe physico-chemical limnology and trophic status of the Tugwi-Mukosi reservoir were assessed seven months after impoundment. Water temperature, conductivity, pH, dissolved oxygen, transparency, nitrates, total nitrogen, orthophosphates, total phosphorus and metals (K, Na, Ca, Mg, Cu, Cd, Cr, Ni, Hg,... -
Cyanobacterial abundance and microcystins in water, seston and fish tissues in Lake Hora-Arsedi (Ethiopia)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TW Zewde --- , Ethiopia D Kifle --- , Ethiopia JA Johansen --- , Norway TB Demissie --- , Ethiopia JH Hansen --- , Norway Z Tadesse --- , EthiopiaThe phytoplanktonic composition with a focus on cyanobacteria, intra- and extracellular microcystins (MCs) concentrations and MCs concentrations in fish tissues were investigated in Lake Hora-Arsedi (Ethiopia). The phytoplankton community comprised of 40 species in the first phase of the study... -
Leaf-cutting ants in commercial forest plantations of Brazil: biological aspects and control methods
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Germano Lopes Vinha --- , Brazil Ricardo Alcántara-de la Cruz --- , Brazil Terezinha Maria Castro Della Lucia --- , Brazil Carlos Frederico Wilcken --- , Brazil Edson Dias da Silva --- , Brazil Pedro Guilherme Lemes --- , Brazil José Cola Zanuncio --- , BrazilForest plantations represent the fourth largest crop by planted area in Brazil. However, leaf-cutting ants can compromise their establishment and development. Atta and Acromyrmex (Hymenoptera: Formicidae) ant genera are the main pests in Eucalyptus and Pinus plantations, and their management... -
Pot trial screening of chemical, biological and natural insecticides for the management of white grubs (Coleoptera: Scarabaeidae) during eucalypt and wattle establishment
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Benice J Sivparsad --- , South Africa Andrew R Morris --- , South Africa Ilaria Germishuizen --- , South AfricaIn South African forest plantations, white grubs (Scarabaeidae larvae) can contribute to high transplant mortality following re-establishment. Currently registered insecticides are considered highly hazardous and their use is restricted by the Forest Stewardship Council (FSC). Therefore, there is an immediate... -
Mass trapping of Coryphodema tristis (Lepidoptera: Cossidae) using a sex pheromone in Eucalyptus nitens compartments in Mpumalanga, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: KP Noeth --- , South Africa PM Verleur --- , South Africa MC Bouwer --- , South Africa JW Crous --- , South Africa J Roux --- , South Africa BP Hurley --- , South Africa B Slippers --- , South AfricaCoryphodema tristis (Lepidoptera: Cossidae) is a native wood-boring moth with a broad host range on both native and non-native vegetation and is an important pest of commercial Eucalyptus nitens plantations in South Africa. Management of C. tristis is challenging since... -
Pheromones as management tools for non-Scolytinae Curculionidae: development and implementation considerations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Luki-Marie Scheepers --- , South Africa Jeremy D Allison --- , Canada Marc C Bouwer --- , South Africa Egmont R Rohwer --- , South Africa Bernard Slippers --- , South AfricaFor the large family Curculionidae, the number of species considered pests is expected to increase due to global movement of plant and soil material, as well as climate change. Pheromones are increasingly popular for use in pest management programmes, either... -
Endocrine-disrupting activity of the fungicide mancozeb used in the Vhembe District of South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MF Seshoka --- , South Africa MC van Zijl --- , South Africa NH Aneck-Hahn --- , South Africa IEJ Barnhoorn --- , South AfricaMany chemicals released into the environment are believed to disrupt normal endocrine functions in humans and animals. A major group of endocrine disrupting chemicals (EDCs) that could be responsible for reproductive defects are those that mimic natural oestrogens, known as... -
Diversity of macrophytes in relation to environmental conditions in wetlands along the lower part of the Gilgel Abay River catchment in Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Habtamu Getnet --- , Ethiopia Seyoum Mengistou --- , Ethiopia Bikila Warkineh --- , EthiopiaThe environmental conditions in wetlands affect the diversity, composition, and distribution of their macrophyte communities. This study investigated the diversity of macrophytes as related to environmental conditions in wetlands of the lower part of Gilgel Abay River catchment in Ethiopia... -
Effect of encroaching woody plant species on soil nutrients and selected soil chemical properties in communally managed semiarid savanna grazing lands in the North West province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Pieter W Malan --- , South Africa Makuété A P Tiawoun --- , South Africa Khumoetsile S Molatlhegi --- , South Africa Simeon A Materechera --- , South AfricaWoody plant encroachment is recognised as one of the major threats to biodiversity in ecosystems. In many arid and semiarid areas of South Africa, indigenous encroacher species are proliferating, but the factors that favor their abundance are poorly understood. This... -
Physiological response of ryegrass (Lolium spp.) grown at different temperatures to glufosinate ammonium application
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tendai Mucheri --- , South Africa Petrus J Pieterse --- , South Africa Carl F Reinhardt --- , South Africa Aleysia Kleinert --- , South AfricaEfficacy of glufosinate ammonium is influenced by temperature. However, several studies show variable results. The response of ryegrass (Lolium spp.) to glufosinate ammonium activity at different temperatures was investigated. Ryegrass was grown at 10/15, 15/20, 20/25, and 25/30 °C (night/day)... -
Adherence to safety practices and risks associated with toxic chemicals in the research and postgraduate laboratories at Sefako Makgatho Health Sciences University, Pretoria, South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Liziwe Lizbeth Mugivhisa --- , South Africa Khanyi Baloyi --- , South Africa Joshua Oluwole Olowoyo --- , South AfricaThe study investigated the knowledge of postgraduate students in the Biology, Chemistry and Biochemistry departments regarding safety practices, protective measures and risks associated with toxic chemicals in the postgraduate and research laboratories. The study was exploratory and was conducted through... -
Rotifers in the Niger River, Niger: diversity and abundance in relation to environmental parameters
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Souley Adamou --- , France B Alhou --- , Niger M Tackx --- , France F Azémar --- , FranceA first study of the rotifers of the Niger River in Niger is reported here. Two surveys took place under contrasting hydrological conditions: low-water level (16 April to 8 May 2018) and high-water level (1 to 15 February 2019). Zooplankton... -
Endogenous metabolic content of the cutting positions and ndole-3-butyric acid influence rooting of Toona ciliata var. pubescens stem cuttings
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Qiangqiang Cheng --- , China Dejia Ji --- , China Xiaoyan Guo --- , China Honglang Huang --- , China Lu Zhang --- , ChinaToona ciliata var. pubescens (family Meliaceae) is an endangered species of mahogany endemic to China. It is now under Class II protection, and stem cuttings are an important means for its clonal propagation. However, the metabolic changes that occur in... -
Macroinvertebrate community structure and diversity in relation to environmental factors in wetlands of the lower Gilgel Abay River catchment, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Habtamu Getnet --- , Ethiopia Seyoum Mengistou --- , Ethiopia Bikila Warkineh --- , EthiopiaThe influence of environmental factors on the diversity of macroinvertebrates was studied in the wetlands of the Gilgel Abay River (GAR) catchment in Ethiopia. The study was done between September 2017 and March 2018, encompassing both wet and dry seasons... -
Ecological quality of the Alibori River, northern Benin, using macroinvertebrate indicators
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TM Agblonon Houelome --- , Benin TP Agbohessi --- , Benin D Adandedjan --- , Benin R Nechifor --- , Romania A Chikou --- , Benin IM Lazar --- , Romania P Laleye --- , BeninThe Alibori River, which flows through Benin’s cotton crop regions, receives surface water from much of the cultivated land that is situated along its banks. Chemical pollution in surface runoff from this land use threatens the ecological quality of the... -
A reflection on tick control and the potential role of botanical products in integrated management practices
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: EMC Theron --- , SR Magano [cor1]Tick infestations and tick-borne diseases continue to be the leading causes of loss in livestock and revenue, particularly in developing countries, despite the prevalent use of synthetic acaricides. Research on plants as alternative sources of anti-arthropod agents has received attention... -
Do male barking geckos (Ptenopus garrulus garrulus) avoid refuges scented by other males?
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: TobyJ. Hibbitts --- University of the Witwatersrand, South Africa MartinJ. Whiting --- University of the Witwatersrand, South AfricaLizards frequently rely on chemical cues to detect the presence of a conspecific or a predator, or to sample and detect potential prey. Male lizards in particular, may chemically sample potential refuges to avoid rivals. We tested whether male common... -
Conspecific pheromone trailing and pheromone trail longevity in the African Colubrid Boaedon fuliginosus
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: AnthonyJ. Wilmes --- Saint Louis University, USA JustinL. Rheubert --- Saint Louis University, USA DavidL. Gruenewald --- Saint Louis University, USA Tharun Kotaru --- Parkway South High School, USA RobertD. Aldridge --- Saint Louis University, USAIn snakes, pheromone trailing is a strategy used for long-distance location of conspecifics. The two existing hypotheses for this behaviour are: a) to locate individuals for reproductive purposes; and b) to form aggregations during the winter/dry season. Pheromone trailing for... -
Participatory inventory and nutritional evaluation of local forage resources for smallholder free-range beef production in semi-arid areas of South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Ayanda Nyambali --- University of Fort Hare, South Africa Julius T Tjelele --- Animal Production Institute, South Africa Mthunzi Mndela --- Animal Production Institute, South Africa Cletos Mapiye --- Stellenbosch University, South Africa Phillip Strydom --- Stellenbosch University, South Africa Emiliano Raffrenato --- Stellenbosch University, South Africa Kennedy Dzama --- Stellenbosch University, South Africa Voster Muchenje --- University of Fort Hare, South Africa Ntuthuko Mkhize --- Animal Production Institute, South AfricaFeed scarcity is a major challenge facing free-range beef farming in semi-arid areas. Specifically, low quality and quantity of forage in rangelands and higher feeding costs are the main constraints limiting smallholder free-range beef farmers’ participation in mainstream beef markets... -
Water quality of the Blue Nile at Khartoum, Sudan, before complete filling of the Grand Ethiopian Renaissance Dam
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AMH Bashir --- University of Khartoum, Sudan ME Abdelrahman --- University of Khartoum, Sudan FA Sinada --- University of Khartoum, SudanPhysico-chemical variables were monitored biweekly for the Blue Nile at Khartoum between July 2017–June 2019. The aim was to document the present status of water quality at Khartoum before complete filling of the Grand Ethiopian Renaissance Dam (GERD). Physico-chemical parameters... -
Validation of growth zone formation in Oreochromis mossambicus otoliths collected from an irrigation pond in the Sundays River Valley, Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mofu --- Rhodes University, South Africa T Dalu --- University of Mpumalanga, South Africa RJ Wasserman --- South African Institute for Aquatic Biodiversity, South Africa DJ Woodford --- University of the Witwatersrand, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaIn fisheries science, life-history trait information is widely used to estimate fish population recruitment, growth, and mortality. The aging and growth of Oreochromis mossambicus from the Sundays River Valley irrigation pond in the Eastern Cape province of South Africa were... -
A comparison of the water quality and plankton diversity of the Okamini Stream to the freshwater systems within the New Calabar River catchment, Port Harcourt, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BB Otene --- Rivers State University, Nigeria I Thornhill --- University of Manchester, United Kingdom J Amadi --- Rivers State University, NigeriaThe water quality and phytoplankton diversity of the Okamini Stream, Port Harcourt, Nigeria was studied between April and June 2018 at three stations. The data was used to assess the health of the system for supporting local communities. Compared to... -
Assessment of water quality for suitability and human health risk: a study of the Owan River, Edo State, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Nkonyeasua Kingsley Egun --- University of Benin, Nigeria Ijeoma Patience Oboh --- University of Benin, NigeriaSuitability assessment of water bodies for human consumption and its implication on human health is critical to water resources utilisation and sustainable development. This study investigated the water quality of the Owan River and the potential health risk to users... -
Spatial interpolation of vertisol physico-chemical properties through ordinary kriging in south-eastern Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Muketiwa Chitiga --- Lupane State University, Zimbabwe Gabriel Soropa --- Chinhoyi University of Technology, Zimbabwe Trevor Dube --- Midlands State University, Zimbabwe Progress Sengera --- GreenFuel, ZimbabweA decline in sugarcane yields from Block G (∼400 ha) of GreenFuel’s Chisumbanje Estate in south-eastern Zimbabwe prompted a study on spatial variability of the soil physico-chemical parameters in the 2017–2018 farming season. Using a systematic gridding schema, 123 geo-located... -
Limnological features and water-quality changes of two Ethiopian Rift Valley lakes, Lake Abaya and Lake Chamo
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Dagne --- National Fishery and Aquatic Life Research Center, Ethiopia H Tadesse --- National Fishery and Aquatic Life Research Center, Ethiopia K Teshome --- National Fishery and Aquatic Life Research Center, EthiopiaWe conducted a study in Lake Abaya and Lake Chamo, the two largest Ethiopian Rift Valley lakes, between 2016 and 2019, to evaluate their limnological features and infer longer-term changes in some water-quality parameters. Data generated through in situ measurements... -
Relationship between sediment grain sizes and macroinvertebrate distribution along the Isiukhu River, western Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Emmanuel Mzungu --- Masinde Muliro University of Science and Technology, Kenya Anthony W Sifuna --- Masinde Muliro University of Science and Technology, Kenya William A Shivoga --- Masinde Muliro University of Science and Technology, KenyaThe current study investigated the relationship between sediment grain sizes and macroinvertebrate distribution along the Isiukhu River, a tropical stream in western Kenya. Ten sites in total were selected from the upstream, midstream and downstream areas. Sampling of sediments and... -
Role of the Lethabo Weir in altering the phytoplankton community structure of the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: S Janse van Vuuren --- North-West University, South Africa A Swanepoel --- , South AfricaDuring 2012, aerial photographs of the Vaal River, South Africa, showed differences in water colour on either side of the Lethabo Weir. Water upstream of the weir was muddy brown, while water downstream was olive-green. Physical and chemical analyses indicated... -
Effects of succinic acid impregnation on physical properties of sapwood and heartwood from plantation-grown short-rotation teak
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sarah Augustina --- National Research and Innovation Agency (BRIN), Indonesia Teguh Darmawan --- National Research and Innovation Agency (BRIN), Indonesia Sudarmanto --- National Research and Innovation Agency (BRIN), Indonesia Narto Narto --- National Research and Innovation Agency (BRIN), Indonesia Adik Bahanawan --- National Research and Innovation Agency (BRIN), Indonesia Danang S Adi --- National Research and Innovation Agency (BRIN), Indonesia Dimas Triwibowo --- National Research and Innovation Agency (BRIN), Indonesia Yusup Amin --- National Research and Innovation Agency (BRIN), Indonesia Imran A Sofianto --- National Research and Innovation Agency (BRIN), Indonesia Prabu S Sejati --- National Research and Innovation Agency (BRIN), Indonesia Wahyu Dwianto --- National Research and Innovation Agency (BRIN), Indonesia Witjaksono --- National Research and Innovation Agency, Indonesia Ragil Widyorini --- Universitas Gadjah Mada, Philippe Gérardin --- Université de Lorraine, France Sari Delviana Marbun --- National Research and Innovation Agency (BRIN), IndonesiaThe aim of this study was to improve the properties of 15-year-old short rotation teak wood using a succinic acid (SA) treatment without excessively increasing the weight gain. The samples were classified as sapwood (SW) and heartwood (HW). Samples were... -
Biostimulant effects on the herbage yield and nutritive composition of a mixed ryegrass–clover pasture
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J de Beer --- Stellenbosch University, South Africa PA Swanepoel --- Stellenbosch University, South Africa JHC van Zyl --- Stellenbosch University, South Africa L Steyn --- Stellenbosch University, South AfricaDairy producers are continuously searching for environmentally friendly and economically sustainable alternatives to increase pasture herbage yield and reduce reliance on chemical fertilisers. A possible means to reduce fertiliser reliance is the use of biostimulants. Biostimulants such as fulvic acid... -
Assessment of water quality and associated human health risk of a tropical freshwater body in Edo State, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Ekene Biose --- University of Benin, Nigeria Nkonyeasua Kingsley Egun --- University of Benin, Nigeria Nkolika Uzoh --- University of Benin, Nigeria Michael Osasele Omoigberale --- University of Benin, NigeriaThe quality of freshwater sources is a key factor in sustainable development. This study investigated the water quality suitability of Ossiomo River for human consumption and the implications for public health. Water samples were collected and analysed from October 2021... -
Nutritional improvement of cactus fruit scraps with addition of alfalfa or Atriplex halimus, and comparison of two animal feed preservation methods (silage and solar drying)
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: L El Hajji --- Sultan Moulay Slimane University, Morocco H Azzouzi --- Sultan Moulay Slimane University, Morocco M Achchoub --- Sultan Moulay Slimane University, Morocco K Elfazazi --- National Agricultural Research Institute, Morocco S Salmaoui --- Sultan Moulay Slimane University, MoroccoThis work aimed to study the effect of adding alfalfa (Medicago sativa L.) and Atriplex halimus L. on biochemical properties, microbial flora, ferment silage and solar-dried cactus fruit scraps. Alfalfa and Atriplex were added to cactus silage to improve nutrient... -
Water-quality assessment and spatial distribution of water-quality parameters of Dodoma Urban, Tanzania
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OJ Mdee --- University of Dodoma, Tanzania B Mndolwa --- University of Dodoma, Tanzania N Sadiki --- University of Dodoma, TanzaniaThe study was conducted in 2022 in shallow wells and deep boreholes owned by residents, to investigate the water quality status in the emerging developing area of Dodoma Urban municipality in central Tanzania. Eighteen boreholes and five shallow wells were... -
Maize farmers’ perceptions of the use of agrochemicals and their impact on the environment: A case study of Iringa District Council, Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Caphlene Japhet Peter --- University of Dar es Salaam, Mkwawa University College of Education, Department of Geography and Economics, Tanzania Sospeter Jibunge Charles --- University of Dar es Salaam, Mkwawa University College of Education, Department of Geography and Economics, Tanzania Michael Elias Mgalula --- University of Dar es Salaam, Mkwawa University College of Education, Department of Geography and Economics, TanzaniaThis study examines farmers’ perceptions of agrochemical use in maize production and their harmful environmental effects. A convergent parallel mixed design was used to collect quantitative data from 254 respondents via structured interviews and qualitative data through in-depth interviews and... -
Perceptions and knowledge about the use of biological indicators in freshwater ecosystem monitoring in Rwanda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Nzarora --- College of Science and Technology, University of Rwanda, Rwanda C Cocquyt --- , Belgium V Nzibaza --- Center of Excellence in Biodiversity and Natural Resources Management, University of Rwanda, Rwanda V Nsengimana --- College of Science and Technology, University of Rwanda, Rwanda PJ Mugume --- Center of Excellence in Biodiversity and Natural Resources Management, University of Rwanda, Rwanda BA Kaplin --- College of Science and Technology, University of Rwanda, RwandaThe use of biological monitoring (biomonitoring) to assess water quality is recognised alongside the use of chemical and physicochemical parameters due to its ability and efficiency in providing information about both current and long-term changes. Indeed, biomonitoring is applied in... -
A preliminary macroinvertebrate index of biotic integrity (M-IBI) for monitoring the highland flood plain wetland ecosystems in Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Habtamu Getnet Fetene --- Asossa University, Ethiopia Seyoum Mengistou --- Addis Ababa University, Ethiopia Bikila Warkineh Dullo --- Addis Ababa University, EthiopiaAnthropogenic activities have put tremendous pressure on the natural condition of wetlands. However, few studies have used indices based on benthic invertebrates to assess the effect of these pressures on wetland ecosystems. Multi-metric indices (MMIs) have been used successfully to... -
Preliminary evaluation of residual herbicides for the control of camelthorn bush (Alhagi maurorum Medik.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B.D. Viljoen [cor0005] C.W. Stoltsz --- Agricultural Research Council, Plant Protection Research Institute, South Africa M. van der Rijst --- Agricultural Research Council, Biometry Unit, South AfricaCamelthorn bush (Alhagi maurorum Medik.) invasion in South Africa is a serious, but still relatively localized problem, with the potential to spread into many other parts of the country. Previous research revealed the difficulty in killing the deep extensive root... -
Soil properties influence tree fall in a fragment of Atlantic Forest in Recife, Pernambuco, Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Maria Salomé de Lima --- Rural Federal University of Pernambuco, Brazil Fernando José Freire --- Rural Federal University of Pernambuco, Brazil Débora de Melo Almeida --- Rural Federal University of Pernambuco, Brazil Brivaldo Gomes de Almeida --- Rural Federal University of Pernambuco, Brazil Renato Lemos dos Santos --- Federal Institute of Education, Science and Technology of Pernambuco, Brazil Luiz Carlos MarangonTrees falling in natural environments can be attributed to tree age, terrain topography, amount of rainfall, wind strength, root type and soil properties. Soil plays a role in nutrient cycling, water retention and distribution, and tree support, and can be... -
Vertical heterogeneity of chemical constituents and in vitro ruminal fermentation parameters in browse tree leaves
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Kgaogelo P Meso --- North-West University, South Africa Caven M Mnisi --- North-West University, South Africa Martin P Hughes --- University of the West Indies, Abubeker Hassen --- University of Pretoria, South Africa Solomon T Beyene --- University of Fort Hare, Victor Mlambo --- University of Mpumalanga, South AfricaRepeated herbivory has the potential to induce adaptive chemical changes in the leaves of browse plants, which can alter their nutritive value. This study examined the interactive effect of tree species and harvest height on chemical composition and in vitro... -
Pastures established on rehabilitated surface coal mined land: an assessment of forage production and implications for livestock grazing
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Emmanuel Nkosinathi Cele --- University of Pretoria, South Africa Monde Rapiya --- University of Pretoria, South Africa Wayne Sanders --- University of Pretoria, South Africa Wayne Truter --- Enterprises University of Pretoria, South AfricaCurrently, land rehabilitation best practice in South Africa is to revegetate ameliorated soil with grass mixtures. These grasses have valuable grazing potential that can deliver great benefits to livestock farmers. However, due to paucity of research and published findings, the... -
Growth potential and productivity of the green macroalgae Ulva reticulata in a sustainable farming system in a coastal lagoon at Bambous Virieux, Mauritius
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Nazurally --- Department of Agricultural and Food Science, University of Mauritius, Mauritius D Beehary-Panray --- Environmental Protection and Conservation Organisation (EPCO), Resilient Island Endeavour (RISE) Project, Mauritius EC Gatteschi --- Cooperazione Internazionale Sud Sud (CISS), Resilient Island Endeavour (RISE) Project, ItalyUlva reticulata is a fast-growing green macroalga with high bioremediation and economic potential. Cultivation of this seaweed at Bambous Virieux in southeast Mauritius was undertaken to evaluate its growth potential and biological feasibility in a tropical lagoon. Over a 30-day...