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A comparison of five methods for assessing veld condition in the natal midlands
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C A H Heard --- Department of Grassland Science, N M Tainton --- Department of Grassland Science, J Clayton --- Department of Grassland Science, M B Hardy --- Department of Agriculture (Natal Region),Site rankings obtained from five methods of scoring veld condition in the highland sourveld and the moist tall grassveld of the Natal Midlands were correlated with rankings from methods of multivariate analysis. With few exceptions, all methods gave rankings which... -
A multivariate approach to a specific problem of grouping maize cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MarieF. Smith --- , Republic of South AfricaThe use of multivariate techniques in the analysis of multivariate problems is illustrated by comparing the results of univariate and multivariate techniques applied to the problem of establishing the nutritional requirements of, and the acid tolerance differences between maize cultivars... -
A quality assurance strategy for wheat (Triticum aestivum L.) where growth environment predominates
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. van Lill --- Faculty of Applied Sciences, Technikon Free State, South Africa MarieF. Smith --- Department of Statistics, South AfricaThe variation in the processing quality of South African winter wheat cultivars over growth environments is detrimental to its market value. Variation in protein content has previously been identified as a primary contributor to this variation and should therefore be... -
Application of Partial Least Squares regression to relate tastiness of boiled potatoes to chemical and physical tests
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Marie F. Smith --- , South Africa Christine S. Leighton --- , South Africa Liesl Morey --- , South Africa Hettie C. Schönfeldt --- , South AfricaPartial Least Squares regression (PLS) was used to understand the relationship between 15 sensory attributes of potatoes boiled in their skins as dependent variables (Y), and six objective (chemical and physical) measurements as the independent variables (X). The ARC-Sensory Analysis... -
THE BENTHIC MACROINVERTEBRATE FAUNA OF A SOUTH AFRICAN MOUNTAIN STREAM AND ITS RESPONSE TO FIRE
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D.L. Britton --- Freshwater Research Unit, Zoology Department, South AfricaThe effects of a late-summer prescribed burn on the temperature and benthic macroinvertebrate fauna of a south-western Cape mountain stream were investigated over a period of 12 months. Temperature and discharge regimes appear well-defined and relatively predictable from year to... -
Savanna browse production. 2: Prediction
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Caryn A Penderis --- School of Life Sciences, South Africa Kevin P Kirkman --- Grassland Science, South AfricaBrowsing herbivores are generally highly selective feeders, selecting for new shoots and young plant material. Determinations of browser carrying capacity are then greatly inflated when based on available browse biomass estimates. Our study was initiated with the aim of modelling... -
The influence of downstream changes in water quality on phytoplankton composition in the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Sanet Janse van Vuuren AJH PieterseLinks between spatial differences in phytoplankton composition and changes in environmental variables in the Vaal River, South Africa, were investigated. Multivariate analysis showed that the most important environmental variables influencing algal abundance were turbidity, conductivity, nutrient concentrations and temperature. Of... -
Fatty acid composition of muscle and heart tissue of Nile perch, Lates niloticus, and Nile tilapia, Oreochromis niloticus, from various populations in Lakes Victoria and Kioga, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Justus Kwetegyeka G Mpango O Grahl-NielsenThe fatty acid composition in the heart tissue and muscle tissue of the Nile perch, Lates niloticus, and Nile tilapia, Oreochromis niloticus populations from Lakes Kioga and Victoria was determined by methanolysis and gas chromatography of the resulting fatty acid... -
Anthropogenic spatial and temporal changes in the aquatic macro invertebrate assemblages of the lower Mvoti River, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Malherbe --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South Africa JHJ van Vuren --- Centre for Aquatic Research, Department of Zoology, South AfricaIndustrial and urban impacts on the lower reaches of the Mvoti River were studied using changes in macroinvertebrate community structures as indicators of environmental change. Macroinvertebrates were sampled during high- and low-flows in 2005 in the lower Mvoti River and... -
10. Multivariate Analysis A Way to Better Understanding of Complexity
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. van Laar --- Faculty of Forestry, South Africa -
Changes in demersal fish assemblages on the west coast of South Africa, 1986–2009
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LJ Atkinson --- , South Africa RW Leslie --- Fisheries Branch, Department of Agriculture, South Africa JG Field --- , South Africa A Jarre --- , South AfricaResearch survey data collected over 24 years (1986–2009) were used to explore long-term changes in demersal fish assemblages on the west coast of South Africa. Differences in spatial (latitude and depth) and temporal (seasonal and annual) factors were examined using... -
The pulp and paper properties of Sirex noctilio infested and fire-damagedthermomechanically pulped, South African grown Pinus patula
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M du Plessis --- , South Africa NJ le Roux --- Department of Statistics and Actuarial Science, South Africa S Gardner-Lubbe --- Department of Statistical Sciences, South Africa JPJ Swart --- Department of Forest and Wood Science, South Africa T Rypstra --- Department of Forest and Wood Science, South AfricaPinus patula is the softwood species most extensively planted in South Africa. However, large portions of these plantings are under threat from Sirex noctilio infestation and occasional forest fires. In this exploratory investigation, the effects of tree age, Sirex noctilio... -
The impact of feedlot effluent on water quality and aquatic macroinvertebrate community structure in streams of the upper Vaal River catchment, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M-N Jonker --- Centre for Aquatic Research, Department of Zoology, South Africa JHJ van Vuren --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South AfricaThe impact of three intensive feedlots on aquatic macroinvertebrate community structure under high and low flows in the upper Vaal catchment was investigated. Water quality variables recorded upstream and downstream of feedlot activity include pH, dissolved oxygen, conductivity, temperature, turbidity,... -
Genetic diversity of Amaranthus species in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Abe S Gerrano --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Willem S Jansen van Rensburg --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South Africa Patrick O Adebola --- Agricultural Research Council–Roodeplaat Vegetable and Ornamental Plant Institute, South AfricaAmaranthus species plays an important role in sustaining food security and alleviation of malnutrition in South Africa. A number of Amaranthus genotypes have been collected and conserved in the gene bank of the ARC–Roodeplaat Vegetable and Ornamental Plant Institute, South... -
Extraordinary items: Accounting and market risk
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: J A Miller --- Emeritus Professor in Accounting and Finance,The market reaction to the recurrent reporting of extraordinary items was tested by calculating and comparing the betas for a portfolio of shares that reported extraordinary items in each of the five years 1990 through 1994 and a control portfolio... -
Explaining the first-year academic performance of commerce academic development students: A statistical analysis
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: L C Smith --- Education Development Unit, Faculty of Commerce, J Pym --- Education Development Unit, Faculty of Commerce, V Ranchhod --- School of Economics,Academic development students’ academic performance in the first-year accounting degree is influenced by a range of personal and contextual variables. The objective of this paper is to conduct an exploratory investigation of a selection of these variables in order to... -
A review of capital market theory from a South African Perspective
Item type: Journal Article • Journal: De Ratione • Authors: D.J. Bradfield --- University of Cape Town,The vast quantity of finance literature dealing with Capital Market Theory on the New York Stock Exchange (NYSE) is evidence of the demand for research in this area. Until very recently, almost no research In this area has been conducted... -
A comparison of multivariate discriminant and logistic regression analysis in the prediction of corporate failure in South Africa
Item type: Journal Article • Journal: De Ratione • Authors: P W Court --- Rhodes University, S E Radloff --- Rhodes University,The prediction of corporate failure, based on a specific model, is of vital importance to a large body of individuals. The two statistical methodologies which enjoy prominence in the literature when establishing these models are multivariate discriminant analysis and logistic... -
The nearest-plant method is robust and powerful enough for different survey teams to monitor change in mesic grassland species composition
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Alan Short --- Themeda Eco Consulting, South Africa Craig Morris --- Agricultural Research Council–Livestock Business Division, Range and Forage Unit, c/o School of Biological and Conservation Sciences, South AfricaA long-term rangeland monitoring programme needs to employ a field survey technique that is practicable, precise, powerful enough to distinguish change, not prone to worker bias, and able to distinguish real change from operator error arising from staff turnover. These... -
On evaluating multivariate polynomials over finite fields
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Edoardo Ballico --- Via Sommarive 14, Italy Michele Elia --- Dipartimento di Elettronica, Politecnico di Torino, ItalySome evaluation methods of multivariate polynomials over finite fields are described and their multiplicative complexity is discussed. -
Morphometric variation in the cutlassfish Trichiurus lepturus on the Kenyan coast: implications for stock identification and management
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SM Mwakiti --- University of Eldoret, Kenya B Kaunda-Arara --- University of Eldoret, Kenya CM Mlewa --- Pwani University, Kenya R Ruwa --- Kenya Marine Fisheries Research Institute, KenyaMorphometric variation was used to study population structure of the cutlassfish Trichiurus lepturus on the Kenyan coast. In all, 16 morphometric measurements taken from 193 individuals from six sites were subjected to multivariate statistical analysis in order to determine possible... -
Community ecology of the metazoan parasites of snoek Thyrsites atun (Euphrasen, 1791) (Perciformes: Gempylidae) off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MAI Nunkoo --- Department of Biological Sciences, South Africa CC Reed --- Department of Biological Sciences, South Africa SE Kerwath --- Department of Biological Sciences, South AfricaThe parasite assemblage of snoek Thyrsites atun, a commercially important fish in the Benguela system, was examined over a one-year period. In all, 16 parasite taxa including eight new host records (Bolbosoma vasculosum, Caligus coryphaenae, Caligus dakari, Corynosoma australe, Hatschekia... -
Model for cutting force prediction in high precision single-point diamond turning of optical silicon
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: M. K. O. Ayomoh --- Mechatronics Engineering Department, South Africa K. A. Abou-El-Hossein --- Mechatronics Engineering Department, South Africa O. A. Olufayo --- Mechatronics Engineering Department, South AfricaThis paper presents a mathematical model predicated on a finite series convergent scheme and derivative functions of multi-variants obtained from a cutting force constitutive equation for onward prediction of the maximum cutting force at the tip of a single-point diamond... -
Characterisation of pigeon pea (Cajanus cajan) landraces grown in two climatic zones in KwaZulu-Natal province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Lindah L Hluyako --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Alfred O Odindo --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Paramu Mafongoya --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Nkanyiso J Sithole --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South Africa Lembe S Magwaza --- Discipline of Crop Science, School of Agricultural, Earth and Environmental Sciences, South AfricaPigeon pea is an important legume in arid and semi-arid areas of the Sub-Saharan Africa. Knowledge of adaptation characteristics of genotypes would significantly enhance its production in diverse environments of the region. Field experiments were conducted at two sites, namely... -
Adoption of agrochemical management practices among smallholder cocoa farmers in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gideon Danso-Abbeam --- SAEES – Discipline of Agricultural Economics, South Africa Lloyd J. S. Baiyegunhi --- SAEES – Discipline of Agricultural Economics, South AfricaThis study explores smallholder cocoa farmers’ adoption decisions of agrochemical inputs in the Ghanaian cocoa industry using farm-level data collected from a sample of 838 farm households in four cocoa producing regions. Multivariate probit and Tobit models were used to... -
Farm household typology and adoption of climate-smart agriculture practices in smallholder farming systems of southern Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Clifton Makate --- International Centre for Tropical Agriculture (CIAT), Zimbabwe Marshall Makate --- Department of Economics, USA Nelson Mango --- International Centre for Tropical Agriculture, UgandaEnhancing adoption rates of climate-smart agriculture practices and their impact on livelihoods requires promotional persistence, complemented by a thorough socioeconomic analysis that recognizes the heterogeneity of smallholder farmers. Farm typologies are a useful tool to assist in understanding and unpacking... -
The bionomics of whitegrub species (Coleoptera: Scarabaeidae) affecting commercial forestry re-establishment in representative areas of the South African summer-rainfall region
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Derian Echeverri-Molina --- Department of Biology, School of Science and Technology, Sefako Makgatho Health Sciences University, South Africa Prem Govender --- Research and Postgraduate Studies Directorate, Sefako Makgatho Health Sciences University, South AfricaSouth African commercial forestry plants mainly Eucalyptus, Pinus and Acacia species. Invertebrate pests play a significant role in the establishment phase of these exotic trees. Whitegrubs, in particular, are known to affect seedling survival during this period. Their pest status... -
Seed mix type but not planting method or seed priming affect grassland restoration outcomes: a greenhouse trial
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Stuart Demmer --- School of Life Sciences, South Africa Michelle J Tedder --- School of Life Sciences, South Africa Kevin P Kirkman --- School of Life Sciences, South AfricaCommercial seed mixes and various mechanical planting methods have been implemented to overcome barriers to successful restoration of degraded grasslands but their effectiveness in aiding the restoration process has been understudied. Harvested seed must be cleaned of chaff to allow... -
Multivariate analysis to research innovation complementarities
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Hernán Alejandro Morero --- Centro de Investigaciones y Estudios sobre Cultura y Sociedad (CIECS) – CONICET y UNC, Argentina Pablo Ortiz --- Facultad de Ciencias Económicas, Departamento de Economía y Finanzas, UNC, ArgentinaIt is widely recognized that orthodox economics is obsessed with econometrics tools. However, econometrics techniques have a limited capacity to deal with qualitative variables coming from surveys. This paper presents a defence of the use of statistical methods, in particular... -
Discrimination of the phenotypic sardine Sardina pilchardus stocks off the Moroccan Atlantic coast using a morphometric analysis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Mounir --- Biodiversity and Dynamics of Ecosystems Laboratory, Department of Biology, Faculty of Sciences, Morocco A Ewague --- Biodiversity and Dynamics of Ecosystems Laboratory, Department of Biology, Faculty of Sciences, Morocco M Znari --- Biodiversity and Dynamics of Ecosystems Laboratory, Department of Biology, Faculty of Sciences, Morocco H Elmghazli --- Biodiversity and Dynamics of Ecosystems Laboratory, Department of Biology, Faculty of Sciences, MoroccoMorphometric variation can be very useful for discriminating ‘phenotypic stocks’ as groups with similar life-history traits. Such groups are of great importance for accurate population-dynamics modelling for purposes of fishery stock assessment and management, independent of their genetic differences or... -
Factors affecting the choice of marketing outlet selection strategies by smallholder farmers in Swaziland
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Bongiwe Porrie Dlamini-Mazibuko --- Discipline of Agricultural Economics, South Africa Stuart Ferrer --- Discipline of Agricultural Economics, South Africa Gerald Ortmann --- Discipline of Agricultural Economics, South AfricaThis paper explores smallholder vegetable farmers’ marketing channel selection decisions using data collected from a sample of 140 farmers from Manzini and Hhohho regions of Swaziland. Multivariate probit analysis was applied to examine the determinants of marketing channels participation. The... -
Volatility transmission in maize futures markets of major exporters
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Ayesha Sayed --- Lecturer of Finance, School of Economic and Business Sciences, South Africa Christo Auret --- Head of Finance Division, School of Economic and Business Sciences, South AfricaThe United States, Brazil, Argentina and South Africa are the largest exporters of maize. This paper examines volatility transmission in maize futures listed on SAFEX, CBOT, MATBA (Argentina) and BMF (Brazil). Four multivariate GARCH models are employed to investigate the... -
Spatio-temporal variation of environmental variables and aquatic macroinvertebrate assemblages in Lake Nokoué, a RAMSAR site of Benin
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OH Odountan --- Laboratory of Ecology and Aquatic Ecosystem Management, Department of Zoology, Republic of Benin L Janssens de Bisthoven --- Capacities for Biodiversity and Sustainable Development (CEBioS), Belgium CZ Koudenoukpo --- Laboratory of Hydrobiology and Aquaculture, Benin Y Abou --- Laboratory of Ecology and Aquatic Ecosystem Management, Department of Zoology, Republic of BeninEnvironmental characteristics and macroinvertebrate assemblages of Lake Nokoué (Benin) were investigated from September 2014 to July 2016. Seasonal and hydroclimatic changes, as well as anthropogenic activities were the overriding factors affecting environmental variables investigated. Analysis of macroinvertebrate community structure with... -
How do firms combine different types of innovation? A multivariate probit approach
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: George Abuchi Agwu --- Department of Economics and Development Studies, Nigeria Tobechi Agbanike --- Department of Economics and Development Studies, Nigeria Nkechinyere Uwajumogu --- Department of Economics and Development Studies, Nigeria R. Anuli Ogbuagu --- Department of Economics and Development Studies, NigeriaWhen previous studies relate innovation behaviours to firm heterogeneity, they consider mainly product and process innovations. In this paper, we consider a wider range of types of innovation that firms could combine to form different innovation strategies. Using the multivariate... -
Modelling spillover effects between the UK and the US stock markets over the period 1935–2020
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Olalekan Aladesanmi --- , United KingdomThis study investigates the spillovers of shocks and volatilities between the UK and the US stock markets over the period 1935–2020. The empirical analysis is carried out for the full sample and four subsample periods by applying the asymmetric GARCH-BEKK... -
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... -
Prospects of sustainable intensification of smallholder farming systems: A farmer typology approach
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Vine Mutyasira --- , ZimbabweSmallholder farming systems are highly diverse, owing to differences in farmers’ resource endowments, levels of technology use, degree of market access and agro-ecological factors. Consequently, the prospects of achieving sustainable intensification of smallholder farming systems need to be examined vis-à-vis... -
The impact of rubber effluent discharges on the water quality of a tropical rain forest river in Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MO Omoigberale --- , Nigeria IM Ezenwa --- , Nigeria E Biose --- , Nigeria C Okoye --- , NigeriaThe impact of a rubber effluent on the water quality of Oken River, Nigeria, was assessed. Surface water was analysed for water quality parameters at four sites; one upstream and three downstream. Significantly raised (p ≤ 0.05) levels of electrical... -
Using crown characterisation variables as indicators of the vigour, competition and growth of Brazilian pine
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lorena Oliveira Barbosa --- , Brazil César Augusto Guimarães Finger --- , Brazil Emanuel Arnoni Costa --- , Brazil Otávio Camargo Campoe --- , Brazil Cristine Tagliapietra Schons --- , BrazilCrown variables are used in growth and production models to increase the accuracy of estimates. These variables are costly and difficult to measure, mainly in dense native forests such as mixed ombrophilous forests (MOF), where Araucaria angustifolia is the predominant... -
Soil quality index for extensive pastures in hilly landforms region of highly weathered soils in an Atlantic forest biome, Brazil
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: DL Burak --- , Brazil E de C Monteiro --- , Brazil RR Passos --- , Brazil E de Sá Mendonça --- , BrazilExtensive pasture systems established in highly weathered tropical soils on steep slopes are vulnerable to soil degradation. Soil degradation can be monitored using an soil quality index (SQI). The SQI can assess both environmental aspects and indices related to pasture... -
Indicators of firm growth: Evidence from the JSE
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Kyle Kildaire --- University of the Witwatersrand, South Africa Avani Sebastian --- University of the Witwatersrand, South Africa Warren Maroun --- University of the Witwatersrand, South AfricaThe estimation of firm growth is increasingly relevant to providers of capital in periods of economic uncertainty. The current study employs univariate and multivariate analyses to assess the impact of real GDP and the dividend payout ratio on earnings growth... -
Density effect on growth variables of eucalypt clones in a Nelder wheel experiment
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Franciele Alba da Silva --- , Brazil Sylvio Péllico Netto --- , Brazil Alexandre Behling --- , Brazil Henrique Soares Koehler --- , Brazil Ataídes Marinheski Filho --- , Brazil Cláudio Cerqueira --- , BrazilNelder’s systematic design enables studies of tree plantation spacing in relatively small areas, which is of great interest for forest planning. However, dependence between observations can arise with this method, making it difficult to use classic statistics for evaluating an... -
Risk factors associated with HIV infection among young persons aged 15–24 years: Evidence from an in-depth analysis of the 2005–06 Zimbabwe Demographic and Health Survey
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Joshua Kembo [d118e18]This study focuses on factors that predispose young persons aged 15–24 years in Zimbabwe to infection from HIV. Using the Mosley and Chen framework, multivariate modelling was used to assess the effect of demographic, socio-economic and behavioural factors on the... -
A review of the southern African ‘non‐spitting’ cobras (Serpentes: Elapidae: Naja)
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: DonaldG. Broadley --- Research Associate, Natural History Museum of Zimbabwe, Wolfgang Wüster --- University of Wales, Wales, U.K.We analysed the systematics of the ‘non‐spitting’ cobras of southern Africa, paying particular attention to the Naja annulifera complex. Multivariate morphometric analyses demonstrate that the taxa annulifera and anchietae are consistently distinct and homogenous over their respective ranges, and their... -
The effects of suspended bivalve culture on benthic community structure and sediment fluxes in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TA Probyn --- Fisheries and the Environment (DFFE), South Africa M Pretorius --- Fisheries and the Environment (DFFE), South Africa F Daya --- Fisheries and the Environment (DFFE), South Africa A du Randt --- Fisheries and the Environment (DFFE), South Africa A Busby --- Fisheries and the Environment (DFFE), South AfricaThis study provides a follow-up to prior measurements of the impact of mussel Mytilus galloprovincialis farming on benthic macrofauna and biogeochemistry and includes the first measurements of the effect of oyster Crassostrea gigas farming in Saldanha Bay, South Africa. The... -
Assessment of surface water quality in a highly anthropised semi-arid catchment (Case of Wadi El Hatab Basin, Tunisia, North Africa)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W Hayouni --- University of Sfax, Tunisia N Chkir --- University of Sfax, Tunisia S Pistre --- Université Montpellier, France K Zouari --- University of Sfax, TunisiaAnthropogenic contamination of surface waters is a critical issue in urbanised catchments, especially in Mediterranean environments with scarce water resources and intermittent rivers. A combined hydro-geochemical and multivariate statistical methodology has been applied to evaluate the surface water quality of... -
Determinants of adoption and intensity of mechanization in Ethiopia: Evidence from Arsi Zone
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gizachew Mengesha Abebe --- Bahir Dar University, Ethiopia Wondaferahu Mulugeta Demissie --- Ethiopian Civil Service University (ECSU), Ethiopia Markose Chekol Zewdie --- Bahir Dar University, EthiopiaMechanization has been recognized as a key thematic area by the Ethiopian Agricultural Research Institute for the period 2018–2030; however, research on its adoption determinants remains limited. This study examines the factors influencing the adoption and intensity of mechanization, focusing... -
Assessment of the ecological integrity and fish community structures of the uMngeni River, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Pumla Dlamini --- University of KwaZulu-Natal, South Africa Colleen T Downs --- University of KwaZulu-Natal, South Africa Matthew Burnett --- University of KwaZulu-Natal, South Africa Gordon O’Brien --- University of KwaZulu-Natal, South AfricaThe uMngeni River is economically important as it provides water to two of the largest cities in KwaZulu-Natal Province, South Africa. As such, protecting the river and the life within it is also of great importance. In this study, we... -
Quality assessment of groundwater in a crystalline semi-urbanised environment (Lefock watershed, Cameroon)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Lauric Tontsa --- University of Dschang, Cameroon Emile Temgoua --- University of Dschang, Cameroon Obina Chigoziem Akakuru --- Federal University of Technology, Nigeria Hara Toukou --- University of Dschang, Cameroon Guillaume Bertrand --- Univerité de Bourgogne Franche-Comté, France Patrick Lachassagne --- Université de Montpellier, FranceThis study provides an assessment of the hydrogeochemical processes influencing shallow groundwater quality in the Lefock watershed (crystalline area, Cameroon). Seventeen groundwater samples were collected in May 2021 during the rainy season. These samples were analysed for their physical characteristics...
