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Grondgeassosieerde, lineêre plantegroeipatrone in die Warmbadomgewing van die Limpopo-provinsie van Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Dinkelmann --- Departement Geografie en Omgewingstudies, E. Verster --- Departement Geografie en Omgewingstudies, T.H. van Rooyen --- Departement Geografie en Omgewingstudies,Lineêre mikroreliëfverskynsels wat op lugfoto's soos vingerafdrukpatrone vertoon en bestaande uit boomryke kruine en grasryke trôe is op die voethang van die Baviaansberg, Warmbadomgewing (Suid-Afrika) beskryf. Vir die doel om die oorsprong van die verskynsels te verklaar is van 'n... -
Estimation of frost occurrence and duration of frost for a short-grass surface
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MJ Savage --- Agrometeorology Discipline, Soil-Plant-Atmosphere Continuum Research Unit, School of Agricultural, Earth and Environmental Sciences, South AfricaThe estimation of frost duration (FD) was investigated using dielectric, infrared surface temperature and grass temperature subhourly measurements. Near real-time FD data and information displays and alerts were also made available via a web-based system. FD was estimated using a... -
Estimation of leaf wetness duration for a short-grass surface
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MJ Savage --- Agrometeorology Discipline, Soil-Plant-Atmosphere Continuum Research Unit, South AfricaThe measurement of leaf wetness duration (LWD) was investigated using subhourly dielectric, infrared surface temperature, dewpoint temperature, grass temperature and relative humidity (RH) measurements. Near real-time LWD data and information displays and alerts were made available timeously via a web-based... -
RATE OF EROSION IN THE CATCHMENT OF THE BULBERGFONTEIN DAM NEAR REDDERSBURG IN THE ORANGE FREE STATE
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: J.S. Ie Roux --- Department of Geography, South Africa Z.N. Roos --- Department of Geography, South AfricaThe volume of sediment in the Bulbergfontein Dam was computed after mapping the area of the dam and ascertaining the depth of the sediment by digging and augering. The watershed of the impoundment had been delimited by means of aerial... -
PHYSICAL, CHEMICAL AND BIOTIC RESPONSES TO DECREASING WATER DEPTH IN A HIGHVELD PAN FOLLOWING WET AND DRY SUMMERS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: KH Rogers --- Department of Botany, WN Ellery --- Department of Botany, NL Winternitz --- Department of Botany, R Dohmeier --- Department of Botany,The classification of highveld pans by Geldenhuys (1982) emphasized the spatial diversity of morphology, vegetation and fauna. However, since the characteristics of individual pans also change seasonally and over longer term wet/dry cycles, he called for more detailed limnological studies... -
Defining function in rangelands of the Peddie district, Eastern Cape, using Landscape Function Analysis
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AR Palmer FJ Killer AM Avis D TongwayPortions of natural rangeland in the Great Fish River Valley have been defined as degraded by several studies using vegetation analysis techniques. It was considered desirable that soil surface condition should also be described to provide an index of landscape... -
Quantification of the soil-water balance under different veld condition classes in a semi-arid climate
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: H.A. SnymanThe monthly herbage production, water-use efficiency (WUE: above-ground phytomass production per unit of evapotranspiration), surface runoff and soil loss were determined on grassland in three different ecological conditions, viz. poor, moderate and good, over a four year (1995/1996 to 1998/1999)... -
First rotation Eucalyptus macarthurii cut stump control in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: KeithM. Little GerhardusJ. van den BergMany cold tolerant eucalypts, E. macarthurii in particular, coppice vigorously following harvesting, and in contrast to E. grandis are proving difficult to kill by existing cut stump control methods. Based on past research, selected cut stump treatments were tested on... -
Control of Eucalyptus grandis cut-stumps of single-stem origin
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: K.M. Little --- , Republic of South Africa N.S. Eccles --- , Republic of South AfricaFour methods to control coppice re-growth on single-stem cut-stump Eucalyptus grandis stools were tested in the Zululand region of KwaZulu-Natal. The methods used were the burning of the plantation residue as opposed to a no-burn control, the application of triclopyr... -
The effect of a soil-amended hydrogel on the establishment of a Eucalyptus grandis x E. camaldulensis clone grown on the sandy soils of Zululand
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: P. W.M. Viero --- , South Africa K.M. Little --- , South Africa D.G. Oscroft --- , South AfricaIn order to ensure the adequate survival of Eucalyptus grandis clonal hybrids on the sandy soils in the Zululand region of South Africa, seedlings are planted with large volumes of water (5 litres per planting pit). This results in a... -
Exploring Mindfulness in Self-Injuring Adolescents in a Psychiatric Setting
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Rümando Kok --- North-West University, South Africa Doret K. Kirsten --- North-West University, South Africa Karel F.H. Botha --- North-West University, South AfricaThis study explored mindfulness amongst eight self-injuring psychiatric adolescents. A mixed-method design was used. Interviews and clinical records comprised the qualitative data, while quantitative data was gathered using the Five-Facet Mindfulness Questionnaire (FFMQ: Baer, Smith, Hopkins, Krietemeyer & Toney, 2006)... -
Cross-Cultural Study of Facial Beauty
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Germano Vera Cruz --- University of Toulouse II, FranceThis research studies proportionality, thinness and smooth skin as cross cultural facial beauty attributes. Participants (N =450; males = 216, females = 234) were college students from three cultural areas: Mozambique (N = 150), Brazil (N = 150) and France... -
Students' Personality Traits and Learning Approaches
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: David P. Ngidi --- Central University of Technology, South AfricaThis study examined students' usage of deep and surface approaches to learning as well as the relationship between students' personality attributes and their approaches to learning. Participants were 284 undergraduate education students registered with a South African regular university (females... -
The Borsuk-Ulam theorem for surfaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: DacibergL. GonçalvesGiven a pair (S, T) whereS is a closed surface and T is a free Z 2 action on S, we classify which pairs have the property that the Borsuk-Ulam theorem holds with respect to R 2. In particular if... -
Mahler Measure and Modular Elliptic Surfaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Leila Benferhat --- , AlgerieIn this paper we prove a formula for the Mahler measure of as the integral of the classical elliptic period function K. By analysing the associated elliptic surfaces we also prove the identity between Mahler measures -
Investigating the interface between health system reform and HIV/AIDS in sub-Saharan Africa: an approach for improving the fight against the epidemic
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: RasmusC Dawes --- , DenmarkDuring the period in which the HIV/AIDS epidemic has taken hold in sub-Saharan Africa, health system reforms have and continue to be introduced throughout the region. In spite of the multidisciplinary research undertaken, it can be questioned whether the relationships... -
Update on the bathymetry of Lake Mweru (Zambia), with notes on water level fluctuations
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ArthurR Bos CyprianK Kapasa PaulAM van ZwietenA new bathymetric map of Lake Mweru was developed, displaying previously unknown morphological features and correcting the shape of the shoreline as presented in older maps. Water depth was measured during 11 transect cruises in early 1994. Two depressions were... -
Antibiotic resistance among heterotrophic bacteria in Lagos Lagoon, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OA Agwu --- Department of Biological Oceanography, NigeriaAntibiotic-resistant bacteria in the aquatic environment are considered reservoirs for drug-resistant genes. Therefore, culturable heterotrophic bacteria isolated from Lagos Lagoon surface waters between 2011 and 2012 were screened for their susceptibility to 14 commonly used antibiotics belonging to six major... -
Detection of land cover changes around Lake Mutirikwi, Zimbabwe, based on traditional remote sensing image classification techniques
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Dube --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa W Gumindoga --- Department of Civil Engineering, Zimbabwe M Chawira --- Zimbabwe Environmental Law Association, ZimbabweLand cover changes around Lake Mutirikwi in 1984–2011 were mapped from Landsat images using traditional image classification methods including the maximum likelihood classifier algorithm. The possibility of mapping the coverage and abundance of surface floating aquatic weeds was also tested... -
Remotely sensed variability of temperature and chlorophyll in the southern Benguela: upwelling frequency and phytoplankton response
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SJ Weeks R Barlow C Roy FA ShillingtonHigh-resolution (1km) satellite data from the NOAA AVHRR (Advanced Very High Resolution Radiometer) and OrbView-2 SeaWiFS (Sea-viewing Wide Field-of-view Sensor) are used to investigate the upper layer dynamics of the southern Benguela ecosystem in more detailed space and time scales... -
A simple method for rapid estimation of Ecklonia maxima and Laminaria pallida biomass using floating surface quadrats
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Rothman --- Department of Agriculture, South Africa RJ Anderson --- Department of Agriculture, South Africa JJ Bolton --- Department of Botany, South Africa CJT Boothroyd --- Department of Agriculture, South Africa FA Kemp --- Department of Agriculture, South AfricaIn South Africa two species of kelp, Ecklonia maxima and Laminaria pallida, occur in quantities sufficient for commercial use. Currently, the former species is harvested in large quantities (about 5 000 tonnes wet weight per year) as abalone feed. In... -
Stock-environment recruitment analysis for Namibian Cape hake Merluccius capensis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Kainge --- National Marine Information and Research Centre, Namibia N Bahamon --- Centre d'Estudis Avançats de Blanes (CEAB-CSIC), Spain CH Bartholomae --- National Marine Information and Research Centre, Namibia JN Kathena --- National Marine Information and Research Centre, Namibia AK van der Plas --- National Marine Information and Research Centre, Namibia A Gordoa --- Centre d'Estudis Avançats de Blanes (CEAB-CSIC), SpainThe factors modulating recruitment success of Cape hake Merluccius capensis in Namibian waters are still unresolved. In this study, we used generalised additive models, regression tree analysis and the conventional Ricker model to examine the effect of environmental indices and... -
The effect of a soil-amended hydrogel on the establishment of a Eucalyptus grandis clone on a sandy clay loam soil in Zululand during winter
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: P.W.M. Viero --- , South Africa K.E.A. Chiswell --- , South Africa J.M. Theron --- , South AfricaTo ensure acceptable survival and growth of Eucalyptus grandis clonal material planted in the sandy clay loam soils of the Zululand interior of South Africa, the current planting season is limited to the summer rainfall period. A field trial was... -
Killing Eucalyptus grandis cut stumps after multiple coppice rotations in the KwaZulu-Natal midlands, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Keith M. Little --- , Republic of South AfricaThe repeated regeneration of Eucalyptus grandis through the managementofcoppice shoots results inlarge multi-stemmed stumpsthat are difficult to kill To test the most effective mannerinwhichthese stumps could be killed, a trial wasinitiated at felling on a fourth rotation stand of E... -
Heavy metals in the water and sediments of Oued Es-Souk, Algeria, a river receiving acid effluents from an abandoned mine
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Chahrazed BoukhalfaThe Sidi Kamber Mine, abandoned since 1976, is still a source of acidic drainage entering the Oued Es-Souk River. An investigation of the rate of pollution of the Oued Es-Souk and the variation of its water quality showed that the... -
Application of a chlorophyll index derived from satellite data to investigate the variability of phytoplankton in the Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: H Demarcq R Barlow L HutchingsThe spatial and temporal variability in phytoplankton biomass in the Benguela ecosystem was investigated over an 8-year period using a chlorophyll index (Chl Index) derived from low resolution SeaWiFS ocean colour data. Monthly composite images revealed that the surface chlorophyll... -
Image-based reflectance conversion of ASTER and IKONOS imagery as precursor to structural assessment of plantation forests in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MT Gebreslasie --- School of Environmental Sciences, South Africa FB Ahmed --- School of Environmental Sciences, South Africa JAN van Aardt --- Laboratory for Imaging Algorithms and Systems, Center for Imaging Science, USAReflectance-converted imagery is a requirement for establishing temporally robust remote sensing algorithms, given the reduction of time-specific atmospheric effects. Thus, in this study image-based atmospheric correction methods for ASTER and IKONOS imagery for retrieving surface reflectance of plantation forests in... -
A qualitative study on the relationship between doctors and nurses offering primary health at KwaNobuhle (Uitenhage)
Item type: Journal Article • Journal: South African Family Practice • Authors: MD Qolohle --- , HH Conradie --- Dept. of Family Medicine, GA Ogunbanjo --- Dept. of Family Medicine & PHC, NH Malete --- Dept. of Family Medicine & PHC,Background -
Approaches to learning by pre-service science students of an institution of higher learning: an exploratory study
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Sheila N. Matoti --- Department of Educational and Professional Studies, South AfricaThis case study explored pre-service science students’ approaches to studying and learning. The participants were 65 undergraduate students (females = 47%; age range 18 to 25 years) at a university of technology in South Africa. Students’ preferences for deep or surface learning... -
Spring body condition, moult status, diet and behaviour of white-faced whistling ducks (Dendrocygna viduata) in northern South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Scott A. Petrie --- Centre for Water in the Environment, University of the Witwatersrand, South AfricaMany white-faced whistling ducks (Dendrocygna viduata) have responded to European colonization by overwintering on irrigation and stock-watering ponds in the semi-arid interior of South Africa. I studied the body condition, diet, behaviour and moult intensity of whitefaced whistling ducks prior... -
The relationship between devoted study time and auditing learning approaches followed by prospective chartered accountants in South Africa
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: K Barac --- Department of Auditing,Learning approaches in accounting, distinguishing between deep, surface and strategic approaches, have been researched in several countries other than South Africa. The study reported in this article provided a South African perspective by investigating the auditing learning approaches of prospective... -
A study of the approaches to learning, engagement with the learning context and conceptions of learning of a group of fourth year accounting students
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: K Mashishi --- Department of Accounting, E Rabin --- Department of Accounting,Recent research into the quality of learning of accounting students has indicated that students lack requisite skills and competencies in a number of areas. Sharma (1997: 125) refers to the following inadequacies, amongst others, that researchers have identified: That students... -
Modelling the tides and their impacts on the vertical stratification over the Sofala Bank, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CM Chevane --- Instituto Nacional de Hidrografia e Navegação, Mozambique P Penven --- LMI ICEMASA, Laboratoire de Physique des Océans, France FPJ Nehama --- Escola Superior de Ciências Marinhas e Costeiras, Mozambique CJC Reason --- Department of Oceanography, South AfricaThe Sofala Bank, a wide shelf located along the central coast of Mozambique, hosts tides with high amplitudes. The Regional Ocean Modelling System (ROMS) was used to analyse the tidal currents on the bank and to investigate their effects on... -
Comparing hotels’ employer brand effectiveness through social media and websites
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Sjoerd Gehrels --- Stenden Hotel Management School, The Netherlands Natascha Wienen --- Stenden Hotel Management School, The Netherlands Julio Mendes --- Faculty of Economics, PortugalThis research explores hotel companies’ employer branding (EB) through the internet. Many countries in the world will face a gap between the demand for talent in the hospitality and tourism industry and the available talent pool. Previous research found that,... -
Optimization of copper nanoparticle biosynthesis process using aqueous extract of Andrographis paniculata
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Supratim Biswas --- Mineral Processing and Technology Research Centre, Department of Metallurgy Faculty of Engineering & The Built Environment, South Africa Suparna Chakraborty --- School of Materials Science and Nanotechnology, India Antoine F. Mulaba-Bafubiandi --- Mineral Processing and Technology Research Centre, Department of Metallurgy Faculty of Engineering & The Built Environment, South AfricaThe competency of aqueous extract of Andrographis paniculata (kalmegh) to reduce copper nitrate for the biosynthesis of copper nanoparticle (CuNPs) was investigated. The experiments were set up according to the design of experiment technique and the results were analyzed for... -
Management for failed back surgery syndrome: three-in-one procedure versus percutaneous spinal fixation alone
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Ahmed Abdalla Mohamed --- Faculty of Medicine, Department of Anesthesiology & ICU, Egypt Atef Kamel Salama --- Faculty of Medicine, Department of Anesthesiology & ICU, Egypt Ahmed Essam Salem --- Faculty of Medicine, Department of Anesthesiology & ICU, Egypt Ashraf El Gallad --- Faculty of Medicine, Department of Neurosurgery, EgyptObjectives: To evaluate the short-term outcome of a 3-in-1 procedure including percutaneous facet radiofrequency, percutaneous spinal fixation and steroid with hyaluronidase enzyme injection versus percutaneous spinal fixation alone for cases with failed back surgery syndrome (FBSS). -
Contrasting hydrography and phytoplankton distribution in the upper layers of cyclonic eddies in the Mozambique Basin and Mozambique Channel
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa RG Barlow --- Marine Research Institute and Department of Oceanography, South AfricaHydrographic data collected in cyclonic eddies in the Mozambique Channel and Basin revealed notable differences in temperature and salinity at a depth of 100 m, the upper mixed layer, the nitracline depths, and vertical distribution of chlorophyll-a (Chl-a). Differences in... -
Influence of electro-polishing characteristics on needle-tissue interaction forces
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mubita Kapui --- Advanced Manufacturing Laboratory, Department of Mechanical Engineering, South Africa Ramesh Kuppuswamy --- Advanced Manufacturing Laboratory, Department of Mechanical Engineering, South AfricaThe electro-polishing process was applied to stainless steel 304 with the aim of improving its surface texture. The electrolyte was a mixture of H2O, H2SO4 (98%) and H3PO4 (85%) at a volume ratio of 2:3:5. Gravimetric analysis and stylus profilometry... -
Validation and downscaling of Advanced Scatterometer (ASCAT) soil moisture using ground measurements in the Western Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jason Moller --- Institute for Water Studies, South Africa Nebo Jovanovic --- Institute for Water Studies, South Africa Cesar L Garcia --- Consejo Nacional de Investigaciones Cientificas y Tecnologicas (CONICET – UCC), Argentina Richard DH Bugan --- CSIR, South Africa Dominic Mazvimavi --- Institute for Water Studies, South AfricaSatellite-based remote sensing of soil water content (SWC) is a promising technology for hydrological applications to overcome large spatiotemporal variabilities of SWC. This study investigated the performance of the Advanced Scatterometer (ASCAT) soil moisture product on METOP satellite (∼12.5 km... -
Optimization of processing conditions for oil reduction of magwinya (a deep-fried cereal dough)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Oluwatoyin Oladayo Onipe --- Department of Food Science and Technology, School of Agriculture, South Africa Daniso Beswa --- Department of Life and Consumer Sciences, School of Agriculture and Life Sciences, South Africa Victoria Adaora Jideani --- Department of Food Science and Technology, Faculty of Applied Sciences, South Africa Afam Israel Obiefuna Jideani --- Department of Food Science and Technology, School of Agriculture, South AfricaObesity – a known risk factor for some metabolic diseases – is still of global concern deeply rooted in unhealthy diet and lifestyle choices. Magwinya, a wheat-based deep-fried snack, absorbs up to 14% of oil. Wheat bran (WB), can serve... -
Human and plant interfaces: relationality, knowledge and practices
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Diana Gibson --- Department of Anthropology and Sociology, South Africa William Ellis --- Department of Anthropology and Sociology, South AfricaThis introduction to the special issue on “Human-Plant Interfaces: Relationality, Knowledge and Practices” briefly makes a case for the ethnography of the human-plant interface by referring to three interrelated aspects that emerge from the set of papers that follow. These... -
A comparison of the cost-effectiveness of different eucalypt cut-stump control management options to reduce competition from coppice regrowth during stand establishment in Mpumalanga, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jonathan C Roberts --- School of Natural Resource Management, South Africa Keith M Little --- School of Natural Resource Management, South Africa Marnie E Light --- Institute for Commercial Forestry Research, South AfricaSelected cut-stump (Cut_surface) and basal frill (Basal_frill) treatments were tested on Eucalyptus macarthurii cut stumps that had previously been coppiced multiple times. Treatments included the application of herbicide (triclopyr as an amine salt, 360 g L−1), either to the cut-surface... -
Occurrence and ingestion of microplastics by zooplankton in Kenya's marine environment: first documented evidence
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Kosore --- Kenya Marine and Fisheries Research Institute, Kenya L Ojwang --- Pwani University, Kenya J Maghanga --- Taita Taveta University, Kenya J Kamau --- Kenya Marine and Fisheries Research Institute, Kenya A Kimeli --- Kenya Marine and Fisheries Research Institute, Kenya J Omukoto --- Kenya Marine and Fisheries Research Institute, Kenya N Ngisiag’e --- Kenya Marine and Fisheries Research Institute, Kenya J Mwaluma --- Kenya Marine and Fisheries Research Institute, Kenya H Ong’ada --- Kenya Marine and Fisheries Research Institute, Kenya C Magori --- Kenya Marine and Fisheries Research Institute, Kenya E Ndirui --- Kenya Marine and Fisheries Research Institute, KenyaMicroplastics can be ingested by marine organisms and may lead to negative impacts at the base of marine food chains. This study investigated the occurrence and composition of microplastics in the sea-surface water and sought evidence of ingestion by zooplankton... -
Environmental influence on phytoplankton communities in the northern Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Barlow --- , South Africa T Lamont --- , South Africa D Louw --- , Namibia M-J Gibberd --- , South Africa R Airs --- , United Kingdom A van der Plas --- , NamibiaAn investigation of surface phytoplankton communities was undertaken on the shelf of the northern Benguela upwelling ecosystem during austral autumn (May) and spring (September), along latitudinal transects at 20° S and 23° S, from 2 to 70 nautical miles offshore,... -
The presence of artificial water points structures an arid-zone avian community over small spatial scales
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Salamatu Abdu --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Alan TK Lee --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South Africa Susan J Cunningham --- FitzPatrick Institute of African Ornithology, DST-NRF Centre of Excellence, South AfricaWater plays a key role in avian thermoregulation, especially when environmental temperatures approach or exceed body temperature. Birds living in arid environments need to either be adapted to life with unreliable access to water, or engage in large-scale movements to... -
Wives’ career progression among dual-career ethno-cultural couples: Husbands’ perspectives
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Sumaiyah Fuad Mohamed --- Department of Human Resource Management, South AfricaThis study explored the perspectives of husbands regarding the participation of their wives in professional occupations. The participants included nine South African Indian men in dual-career marriages (ages ranging from 25 to 54 years old). The completed semi-structured, life-story interviews... -
Seasonal cycle of the salinity barrier layer revealed in the northeastern Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AN Dossa --- International Chair in Mathematical Physics and Applications (ICPMA-UNESCO Chair), Benin CY Da-Allada --- International Chair in Mathematical Physics and Applications (ICPMA-UNESCO Chair), Benin G Herbert --- Institut de Recherche pour le Développement (IRD), Instrumentation, Moyens Analytiques, France B Bourlès --- Institut de Recherche pour le Développement (IRD), Instrumentation, Moyens Analytiques, FranceThe region located in the far northeast of the Gulf of Guinea (NEGG), eastern tropical Atlantic, remains poorly documented due to a lack of available in situ ocean data. Heavy rainfall and intense river discharges observed in this region induce... -
Localised intermittent upwelling intensity has increased along South Africa’s south coast due to El Niño–Southern Oscillation phase state
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MI Duncan --- Department of Ichthyology and Fisheries Science, South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa AE Bates --- Department of Ocean Sciences, Canada WS Goschen --- Institute for Coastal and Marine Research, Ocean Sciences Campus, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe El Niño–Southern Oscillation (ENSO) phase state is reported to drive interannual variability in sea temperatures along South Africa’s south coast through its influence on wind-induced upwelling processes. Whether ENSO drives the intensity of localised, abrupt, intermittent upwelling is less... -
Salt marsh elevation and responses to future sea-level rise in the Knysna Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JL Raw --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa T Riddin --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa J Wasserman --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa TWK Lehman --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South Africa TG Bornman --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa JB Adams --- DST/NRF Research Chair in Shallow Water Ecosystems, Department of Botany, South AfricaSea-level rise is a significant threat to salt marshes. However, these habitats can respond by increasing their relative elevation, or by migrating into adjacent areas. Here we provide the first report on surface elevation change for salt marsh at the... -
The effectiveness of riparian zones in mitigating water quality impacts in an agriculturally dominated river system in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CR Petersen --- , South Africa NZ Jovanovic --- , South Africa MC Grenfell --- , South AfricaThis study evaluates relationships between contrasting land uses representing an anthropogenic impact gradient in a coastal agricultural catchment, and riparian vegetation, as reflected in changes in nutrient dynamics and water quality. The objectives were to: 1) determine the water and... -
Assessment of heavy metals pollution in surface and groundwater systems in Oued Righ region (Algeria) using pollution indices and multivariate statistical techniques
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: ML Benhaddya --- , Algeria Y Halis --- , Algeria B Hamdi-Aïssa --- , AlgeriaSurface and groundwater samples of the Oued Righ region (south-eastern Algeria) were analysed for Cd, Cr, Cu, Mn, Ni, Pb and Zn by atomic absorption spectrophotometric method. An integrated approach of pollution evaluation indices and multivariate statistical methods (one-way ANOVA,... -
A survey of Great-winged Petrels Pterodroma macroptera breeding at sub-Antarctic Marion Island and a revised global population estimate
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ben J Dilley --- , South Africa David W Hedding --- , South Africa Stefan Schoombie --- , South Africa Peter G Ryan --- , South AfricaAlthough burrow-nesting petrels are the most abundant group of seabirds in the Southern Ocean, their global populations are poorly known, because most species breed on remote islands. For example, there are no accurate estimates for Great-winged Petrel Pterodroma macroptera populations... -
Characterising the seasonal cycle of wind forcing, surface circulation and temperature around the sub-Antarctic Prince Edward Islands
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Toolsee --- , South Africa T Lamont --- , South Africa M Rouault --- , South Africa I Ansorge --- , South AfricaLocated between the sub-Antarctic Front and the Antarctic Polar Front, the Prince Edward Islands (PEIs) provide an essential breeding ground for top predators and are an ideal location to investigate disturbances linked to climate change. This study provides the first... -
Anthropogenic food availability and body mass maintenance in urban Red-winged Starlings Onychognathus morio
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Taylyn C Risi --- , South Africa Petra Sumasgutner --- , South Africa Susan J Cunningham --- , South AfricaAnthropogenic food availability is influenced by short-term fluctuations in human presence, especially in core urban areas. Few studies have explored responses to such day-to-week fluctuations, specifically on body mass and body condition of urban birds. Here, we investigated non-breeding body... -
Assessing the impact of climate change on crop production in southern Africa: a review
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AC Franke --- , South AfricaThis paper provides a systematic review of studies assessing the impact of climate change on crop yields in southern Africa. Moreover, it synthesises the current knowledge of the impact of elevated ambient CO2 levels (eCO2) and temperatures on physiological processes,... -
Challenges and opportunities for water conservation in irrigated agriculture in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Willem de Clercq --- , South Africa Marlene de Witt --- , South Africa Giel Laker --- , South AfricaThis review provides a brief overview of problems in irrigated agriculture that have become more evident as a result of climate change. In most irrigated regions in South Africa, the demand for water is exceeding the supply, as surface water... -
Current-day distribution of the rinkhals (Hemachatus haemachatus) in central South Africa and Lesotho: An evaluation based mainly on photographic and videographic records from social media
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Michael F Bates --- National Museum, South Africa Cora S Stobie --- National Museum, South AfricaThe rinkhals (Hemachatus haemachatus) is a well-known venomous elapid found in greater South Africa and the eastern highlands of Zimbabwe. To evaluate its current-day (mostly 2012–2021) distribution in central South Africa and Lesotho, we examined various media sources, including Facebook,... -
Face validity and content assessment of a diabetes nutrition education DVD for low literacy adults living with diabetes: a mixed-method study
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: Dianré Kapp --- , South Africa Gerda J Gericke --- , South Africa Jane W Muchiri --- , South AfricaAim: A study was undertaken to assess the face validity and content correctness of a diabetes nutrition education (DNE)-DVD developed for low literacy adults living with diabetes. -
Evaluation of furrow irrigation performance: Case of Kasinthula Cane Growers Scheme in Malawi
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Stanley Phiri --- , Malawi Thomas Nyanda Reuben --- , Malawi Grivin Chipula --- , Malawi Kenneth Alfred Wiyo --- , MalawiSurface irrigation is associated with low irrigation efficiencies and exerts a lot of pressure on water resources. Despite this, the irrigation method remains dominant in Malawi and other sub-Saharan Africa countries. A need exists to improve surface irrigation efficiencies in... -
The short-term effects of surface-applied dolomitic lime and gypsum on soil chemical properties and yields of sugarcane ratoon crops in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile Siphesihle Mthimkhulu --- , South Africa Dimpho Elvis Elephant --- , South Africa Neil Miles --- , South Africa Louis William Titshall --- , South AfricaThis study investigated the effects of surface-application of lime and gypsum on soil properties and yields of ratoon sugarcane crops. Treatments involved once-off surface application of dolomitic lime (L), gypsum (G) and dolomitic lime plus gypsum (LG) in factorial combination,... -
An empirical study stepping towards ethnographic research for e-commerce websites: A perspective of user-centred design
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Thabang Excellent Mofokeng --- University of Johannesburg, South AfricaUser-centred design denotes human-centred design processes for interactive systems that intend to meet consumers’ demand for web interface design and usability in human–computer interactions. Perceptions of user interface quality, security, trust, and loyalty were examined in this study. Cross-sectional data... -
Impact of cold plasma-mediated treatment on coated and packaged ‘Monterey’ strawberries during cold storage
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Zinash A Belay --- , South Africa Nandi E Nyamende --- , South Africa Oluwafemi James Caleb --- , South AfricaCold plasma technology has been used within the food industry for surface decontamination. Therefore, this study investigated the efficacy of low-pressure cold plasma (CP) treatment to decontaminate sodium alginate-coated and packaged ‘Monterey’ strawberries. Cold plasma treatment was carried out at... -
Digital Jordan curves and surfaces with respect to a graph connectedness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Josef Šlapal --- Brno University of Technology, Institute of Mathematics, Czech RepublicWe introduce a graph connectedness induced by a given set of paths of the same length. We focus on the 2-adjacency graph on the digital line ℤ with a certain set of paths of length n for every positive integer... -
Widowhood in the era of HIV/AIDS: A case study of Slaya District, Kenya
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Constance Ambasa-Shisanya --- Family Health International,Luo women are believed to acquire contagious cultural impurity after the death of their husbands that is perceived as dangerous to other people. To neutralise this impure state, a sexual cleansing rite is observed. In the indigenous setting, the ritual... -
An enumeration of orphans and analysis of the problems and wishes of orphans: the case of Kariba, Zimbabwe
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Jaqualine F Mangoma --- University of Zimbabwe Lake Kariba Research Station, Moses J Chimbari --- University of Botswana's Harry Oppenheimer Okavanga Research Centre, Elmon Dhlomo --- University of Zimbabwe Lake Kariba Research Station,In southern Africa, HIV and AIDS accounts for the largest proportion of orphans. Very often the orphaned children become destitute, and young girls in particular become more vulnerable to HIV and AIDS as they try to fend for the rest... -
Perception of government employees on the use of biometric technology in determining a person’s ethnic group in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Martins E. Irhebhude --- Nigerian Defence Academy, Nigeria Adeola O. Kolawole --- Nigerian Defence Academy, Nigeria Agwi C. Uche --- Nigerian Defence Academy, Nigeria Adeleye V. Dupe --- Nigerian Defence Academy, NigeriaSelected biometric technologies such as iris, face, gait, voice, etc. are widely used for the recognition of individuals. This paper presents a biometric technology perception by members of staff from government agencies in Nigeria, namely: the National Identity Management Commission... -
Compression with wildcards: Abstract simplicial complexes
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Marcel Wild --- Stellenbosch University, SADespite the more handy terminology of abstract simplicial complexes , in its core this article is about antitone Boolean functions. Given the maximal faces (=facets) of , our main algorithm, called Facets-To-Faces, outputs in a compressed format. The degree of... -
Dissipation of environmental DDT and its metabolites in selected rivers of south-western Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JK Nyaundi --- Kenya Marine and Fisheries Research Institute, Kenya SK Omasaki --- Kisii University, Kenya JM Babu --- Kenya Marine and Fisheries Research Institute, Kenya NM Mwirigi --- Kenya Marine and Fisheries Research Institute, Kenya R Omondi --- Kisii University, Kenya GA Mwayulj --- Great Lakes University of Kisumu, Kenya S Bassa --- National Fisheries Resources Research Institute (NaFIRRI), UgandaRivers are the main source of domestic and industrial water supplies in Kenya. In this study, water sampling was done at eight upstream sites in the Kuja River catchment, Kenya, between October 2016 and April 2017, specifically to test for... -
Sensitivity simulation of sea surface temperature variability in coastal waters off East Africa in relation to the Indian Ocean Dipole
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MC Manyilizu --- The University of Dodoma, TanzaniaEast African coastal waters in the tropical western Indian Ocean experience strong seasonality which varies yearly, leading to the establishment of a prominent interannual Indian Ocean Dipole (IOD). This has a significant influence on regional and global socio-economic, climatic and... -
Moving the Margins: Gender Inequality and Homelessness in Amma Darko’s Faceless
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Puleng Segalo --- University of South Africa, South Africa Theresah Patrine Ennin --- University of South Africa, South AfricaMany African women writers have engaged with issues of social justice, development and the need to pay attention to the persistent inequalities that eat away the fabric of many societies. To this day, they continue to be at the coalface... -
Beauty and materiality: Subjective social class mediation of self-perceived physical attractiveness and materialism in Chinese college students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Baoyan Yang --- Northwest Normal University, China Xiaoyue Zhao --- Northwest Normal University, China Mengmeng Zhu --- Northwest Normal University, China Yiting Wang --- Northwest Normal University, China Qiaoqiao Du --- Northwest Normal University, ChinaThis study examines the relationship between self-perceived physical attractiveness and materialism, and the mediating role of subjective social class in that relationship. Participants were 375 Chinese college students (female = 79%; sophomore = 29%; mean age = 21.99; SD =... -
Patterns in sightings of ocean sunfishes (Molidae) in the greater Dyer Island ecosystem, Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RGA Watson --- , South Africa E Frey --- Queen’s University, Canada S Hörbst --- , South AfricaThis study aims to describe the distribution of ocean sunfishes (family Molidae) in the greater Dyer Island ecosystem off the southwest coast of South Africa. Between 2014 and 2022, local whale watching vessels operating under Dyer Island Cruises conducted 3... -
‘Yo Dumbfucks!’: Problematising “Transgressive” White Humour and the Use of Blackface in the Artworks of South African Visual Artist Anton Kannemeyer
Item type: Journal Article • Journal: Eastern African Literary and Cultural Studies • Authors: Sharlene Khan --- University of the Witwatersrand, South AfricaSince the early 1990s, blackface has seen a resurgence in South Africa. In 2010, Pappa in Afrika, the artwork of White Afrikaner artist Anton Kannemeyer elicited public criticism. Interrogating Kannemeyer’s Pappa in Afrika, this paper questions assumptions of blackface’s parodic... -
How psychological contract breach relates to façades of conformity: The mediating role of emotional labour
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Feng-Hua Yang --- Da-Yeh University, Taiwan Huai-Liang Liang --- Da-Yeh University, TaiwanWe investigated the relationship between psychological contract breach (PCB) and façades of conformity and mediation by surface acting and deep acting. Employees (n = 255) from a large bank in Taiwan were surveyed (female = 58.80%; mean age = 36.30... -
Umbilicity of complete linear Weingarten hypersurfaces immersed in certain Einstein manifolds
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Henrique F. de Lima --- Universidade Federal de Campina Grande, Brazil Lucas S. Rocha --- Universidade Federal de Campina Grande, Brazil Marco Antonio L. Velásquez --- Universidade Federal de Campina Grande, BrazilIn this paper, we present some sets of geometric conditions that ensure the umbilicity of linear Weingarten hypersurfaces immersed in an Einstein manifold satisfying standard curvature constraints which, in particular, are verified by a Riemannian space with constant sectional curvature... -
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...
