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The effect of stocking rate and lick supplementation on the performance of lactating beef cows and its impact on Highland Sourveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: A. Van Niekerk --- Department of Agriculture (Natal Region), M.B. Hardy --- Department of Agriculture (Natal Region), B.D. Mappledoram --- Department of Agriculture (Natal Region), S.F. Lesch --- Department of Agriculture (Natal Region),The Highland Sourveld of Natal is an important beef producing area. Although it covers only 13% of the total area of the province, it supports 18% of the beef cattle population. -
The effect of thirty years of burning on the Highland Sourveld of Natal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.S. Everson --- Department of Environment Affairs, Directorate of Forestry, N.M. Tainton --- Department of Grassland Science,A veld condition assessment was used to determine the effect of past burning treatments on the species composition of Highland Sourveld at Cathedral Peak. Veld condition scores in grassland protected from fire were significantly lower than where veld had been... -
Influence of stocking rate and grazing system on plant basal cover and botanical composition of veld in the northern cape1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.H. Fourie --- Department of Agriculture (Free State Region), G.J. Redelinghuys --- Department of Agriculture (Free State Region), D.P.J. Opperman --- Department of Pasture Science,Changes in basal cover and botanical composition were recorded at four stocking rates, both under continuous and rotational grazing in the Northern Cape. The experiment was conducted with cattle. Results suggested that heavier stocking rates could be applied under rotational... -
Conservative stocking or maximum profit: A grazing management dilemma?
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture (Eastern Cape Region), P.G. King --- Department of Agriculture (Eastern Cape Region),Swards in the False Thornveld of the Eastern Cape are generally stocked considerably in excess of the rate currently recommended for maximised production on a sustained basis. Economic analysis of the relationship between stocking rate and production per ha reveals... -
Forage production of some grass species in the false Thornveld of the Eastern Cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: I.E. Danckwerts --- Department of Agriculture (Eastern Cape Region), A.I. Aucamp --- Department of Agriculture (Eastern Cape Region), H.I. Barnard --- Department of Agriculture (Eastern Cape Region),The most commonly occurring grass species in the False Thornveld (Acocks, 1953; veld type no. 21) were clipped before and after grazing on veld in good and poor condition at different times of the year. Herbage yield per species was... -
Effect of continuous grazing in the dohne sourveld on species composition and basal cover
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.F. du Toit --- , A.J. Aucamp --- ,In a grazing trial conducted at the Dohne Agricultural Research Station, natural grassland was grazed continuously for 36 years with cattle. In a second investigation conducted on similar grassland, paddocks were grazed or rested, in all combinations of the four... -
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 preliminary investigation of woody plant increase in the western Transvaal and implications for veld assessment
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: MargaretH. Friedel --- Division of Wildlife and Rangelands Research, AustraliaThe relationships between tree density and indices of pasture and soil condition were examined in Western Transvaal grasslands where Acacia karroo had increased following disturbance. The correlation between tree density and pasture condition was not linear, indicating a threshold in... -
Identification and selection of benchmark sites on litholitic soils of the western grassland biome of South Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: O.J.H. Bosch --- Department Botany, F.P. Janse van Rensburg --- Department Botany, S. du T. Truter --- Department Botany,An approach to identify benchmarks for different ecological situations in the grassland biome is described. The approach is illustrated by using information on vegetation change, role of habitat factors and the relative palatability differences between the species of the vegetation... -
Fertilization of southern tall grassveld of natal: Effects on botanical composition and utilization under grazing
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.R. Barnes --- Department of Grassland Science, D.I. Bransby --- Department of Grassland Science, N.M. Tainton --- Department of Grassland Science,The long‐term effects of nitrogen, phosphate and lime on change in botanical composition and utilization under grazing of Southern Tall Grassveld of Natal are presented. Nitrogen, phosphate, lime and type of nitrogen affected botanical composition significantly. Generally, fertilization had the... -
Composition, pattern and diversity of some Transkeian grasslands
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: B. McKenzie --- Department of Botany,Species composition, pattern and diversity of selected grassland communities were determined by using point samples, transects and quadrats. The continuously grazed grasslands of Dohne Sourveld generally had the richer species composition, the highest diversity and the most variable intra‐community pattern... -
Ecological status of species on grazing gradients on the shallow soils of the western grassland biome in South Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: O.J.H. Bosch --- Department Botany, F.P. Janse vanRensburg --- Department Botany,Grasses on the shallow soils of the western grassland biome of South Africa were classified on their ecological status on the basis of their reaction to grazing. Vegetation data were gathered in such a way that those of different successional... -
The effect of severe drought and management after drought on the mortality and recovery of semi‐arid grassveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture (Eastern Cape Region), G.C. Stuart‐Hill --- Department of Agriculture (Eastern Cape Region),The False Thornveld of the Eastern Cape experienced a particularly intense drought during the 1982/83 growing season. Extensive grass mortality took place during the drought. After the drought, recovery was particularly sensitive to the post‐drought management treatment applied. Veld that... -
An evaluation of the economic viability of commercial pastoralism in the smaldeel area of the Eastern Cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture and Water Supply (Eastern Cape Region), J.B. Marais --- Department of Agriculture and Water Supply (Eastern Cape Region),Carrying capacity models and financial data from study group farmers were used to derive attainable net revenue per ha on veld in good, moderate and poor condition. From these data, minimum farm sizes required for a reasonable standard of living... -
Die invloed van brand en maai op onbeweide langgrasveld in Natal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.J.G. leRoux --- Departcment Landbou, Republiek van Suid‐AfrikaThe effect of burning and mowing on ungrazed tall grassveld of Natal. The trial was conducted on the Estcourt Research Station to show the effect of 14 burning and mowing treatments without grazing in the tall grassveld of Natal. The... -
The quality of herbage ingested by cattle in rotationally grazed semi‐arid grassveld of the eastern Cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture (Eastern Cape Region), Republic of South AfricaOesophageal fistulated steers were used to sample herbage daily during periods of occupation on veld in good and moderate condition. Forage quality was assessed in terms of in vitro dry matter digestibility and digestible crude protein. The quality of herbage... -
‘n Vergelyking van wei‐ en voergewasse vir die produksie van slaglammers in die Pretoria‐ Witwatersrand‐Vereeniging(PWV)‐gebied
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.A. Pieterse --- Departement Plantproduksie, Republiek van Suid‐Afrika J.O. Grunow --- Departement Plantproduksie, Republiek van Suid‐Afrika N.F.G. Rethman --- Departement Plantproduksie, Republiek van Suid‐Afrika W.A. van Niekerk --- Departement Veckunde, Republiek van Suid‐AfrikaA comparison of pasture and fodder crops for the production of slaughter lambs in the Pretoria‐Witwatersrand‐Vereeniging (PWV) area. A number of pasture and fodder species were evaluated for the production of mutton with weancr lambs. Animal performance and meat production... -
A weighted key species method for monitoring changes in species composition of Highland Sourveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.R. Hurt --- Department of Agriculture (Natal Region), Republic of South Africa M.B. Hardy --- Department of Agriculture (Natal Region), Republic of South AfricaThe use of key species for indexing veld condition in relation to the fire/grazing impact has potential for monitoring change in the Highland Sourveld of Natal. Weightings are calculated for previously identified key species. A weighted‐averages approach is used in... -
Interrelationships between veld condition, herbage mass, stocking rate and animal performance in the Tall Grassland of Natal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.R. Turner --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaGrazing trials were established at three sites in the Tall Grassveld of Natal. The objectives were to determine (a) patterns in herbage mass in relation to veld condition, stocking rate and commencement of spring grazing, and (b) animal performance in... -
Use of multivariate techniques to identify vegetation units and monitor change on a livestock production system in a semi‐arid savanna of the eastern Cape
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.C. Martens --- Departmentof Agricultural Development (Eastern Cape Region), Republic of South Africa J.E. Danckwerts --- Departmentof Agricultural Development (Eastern Cape Region), Republic of South Africa G.C. Stuart‐Hill --- Departmentof Agricultural Development (Eastern Cape Region), Republic of South Africa A.J. Aucamp --- Departmentof Agricultural Development (Eastern Cape Region), Republic of South AfricaSpecies composition data of the grass layer were determined from point surveys along permanently demarcated transects. These data were separated into vegetation units using multivariate techniques. The repeatability of this classification was tested on data collected over a period of... -
A conceptual stocking rate model for the moderately dry mixed and sourveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.R. Turner --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaResults for the 1986/87 season from 15 grazing trials situated at five sites were used to develop a qualitative model describing the relationships between stocking rate and herbage mass and between stocking rate and individual animal performance. Although it cannot... -
Korttermyn invloed van strawwe droogte op veldtoestand en waterverbruiksdoeltreffendheid van grasveld in die sentrale Oranje‐Vrystaat
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: H.A. Snyman --- , Republiek van Suid‐Afrika W.L.J. van Rensburg --- , Republiek van Suid‐AfrikaShort‐term effect of severe drought on veld condition and water use efficiency of grassveld in the central Orange Free State. The impact of an intensive drought (1982/1983 and 1983/84‐growing seasons) on botanical composition, basal cover, mortality of grazing plants and... -
Towards visual assessment of succulent valley bushveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.C. Stuart‐Hill --- Department of Grassland Science, Republic of South AfricaVisual vegetation assessment was tested for repeatability and accuracy and compared with an objective survey technique for time and cost efficiency. Eighteen operators first inspected a range of sites where ecological status was known. Using these for reference, they then... -
The complemental role of dryland cultivated pastures in market‐related beef production from semi‐arid rangeland
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: L.G. duPisani --- Department of Agricultural Development, Republic of South Africa T.E. Skinner --- Department of Agricultural Development, Republic of South AfricaRangeland condition is a decisive factor in determining the income:cost ratio of production and hence in the profitability of any beef production enterprise. By maintaining and/or improving rangeland condition, the beef producer can buffer himself against low profitability. Cultivated pastures... -
Remote sensing applications for monitoring rangeland vegetation
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.T. Tueller --- Department of Range, Wildlife and Forestry, United States of AmericaRemote sensing techniques hold considerable promise for the inventory and monitoring of natural resources on range‐lands. A significant lack of information concerning basic spectral characteristics of range vegetation and soils has resulted in a lack of rangeland applications. To use... -
The Potch System: An approach to the management of semi‐arid grasslands in southern Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: R.H. Drewes --- Department of Agricultural Development, Republic of South AfricaA host of grassland management systems have been published and recommended. Whereas earlier approaches to grassland management emphasized the systematic resting aspect, the systems published since 1966 have tended to stress the degree of utilization of the grassland sward. In... -
An alternative approach to veld condition assessment in the non‐grassveld regions of South Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: G.C. Stuart‐Hill --- Department of Grassland Science, Republic of South Africa F.O. Hobson --- , Republic of South AfricaTraditional veld condition assessment methods score veld either in terms of its ‘state of health’ or its value for a specific land‐use objective. This is problematic and we propose that ‘veld condition’ should simply be a descriptive index, devoid of... -
Range monitoring in South Africa: A broad perspective
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: A.J. Aucamp --- , Republic of South Africa J.E. Danckwerts --- Department of Plant Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaRange monitoring is defined, in the context of this paper, as regular surveillance to establish whether properties of the range are changing. The objective of such monitoring is therefore to establish whether temporal changes are taking place in response to... -
Osmoconditioning of seeds of sweet pepper (Capsicum annuum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H.A. van de Venter --- Magaretha Mes Institute for Seed Research, Rentia Hoffman --- Magaretha Mes Institute for Seed Research,Germination rate of seeds of sweet pepper (Capsicum annuum L.) cv. Florida Resistant Giant was increased significantly at both 15 °C and 25 °C after osmotic priming for 10 days at 15 °C in solutions of polyethylene glycol. Post-treatment drying... -
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... -
Measurements of mineralization, nitrification and denitrification in laboratory incubations of soil from a semi-arid natural grassland
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South Africa C.C. du preez --- Department of Soil Science, Republic of South AfricaExperiments were done to compare three incubation methods after it was found that prolonged incubation of soil in sealed preserving jars resulted in the exhaustion of head- space oxygen and anaerobiosis in the soil. Nitrate added to soil from the... -
Effects of sample drying temperature on indices of available nitrogen in soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: G.H. Wiltshire --- Department of Soil Science, Republic of South Africa C.C. du Preez --- Department of Soil Science, Republic of South AfricaDuring a field trial investigation into the long-term effects of conservation practices on the nitrogen fertility of a soil cropped annually to wheat, it was observed that sample preparation had an effect on some indices of available nitrogen. The trial... -
Effect of soil fertility management strategies and resource-endowment on spatial soil fertility gradients, plant nutrient uptake and maize growth at two smallholder areas, north-western Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J. Nyamangara --- Department of Soil Science and Agricultural Engineering, Zimbabwe E. Makarimayi --- Department of Soil Science and Agricultural Engineering, Zimbabwe E.N. Masvaya --- Department of Soil Science and Agricultural Engineering, Zimbabwe S. Zingore --- , Malawi R.J. Delve --- , ZimbabweWe investigate the effects of smallholder farmer resource—endowment and soil nutrient management strategies on plant nutrient uptake and growth across soil fertility gradients under semi-arid conditions. Soil fertility gradients as influenced by farmers’ resource availability may affect the response of... -
A comparison of condition factor and gonadosomatic index of sardine Sardinops sagax stocks in the northern and southern Benguela upwelling ecosystems, 1984–1999
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: A. Kreiner C. D. van der Lingen P. FréonTime-series of condition factor (CF) and gonadosomatic index (GSI) were generated using general linear models (GLM) for sardine Sardinops sagax stocks in the northern and southern Benguela ecosystems over the period 1984–1999. During this period the biomass of sardine in... -
Reproduction and recruitment patterns of the surf clam Donax serra (Bivalvia, Donacidae) on two Namibian sandy beaches
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: J. Laudien T. Brey W. E. ArntzReproduction and recruitment of the surf clam Donax serra on two Namibian beaches were studied over a period of two years. Histological examination of the gonads indicated a discontinous annual reproductive cycle, related to monthly mean sea surface temperature. The... -
THE LENGTH/MASS RELATIONSHIP AND CONDITION OF LABEO CAPENSIS IN THE CALEDON RIVER
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.P. Baird --- Department of Zoology, South Africa S. Fourie --- Department of Zoology, South AfricaThe length mass relationship for a Labeo capensis population is described by the equation M = 0,0134 L2'999 where 2,999 represents a constant the value of which indicates isometric growth. There is very little difference between the length/mass relationship for... -
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,... -
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... -
A CHARACTERIZATION OF SOUTHERN AFRICAN ESTUARINE SYSTEMS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: A.K. Whitfield --- , South AfricaModifications to the structure and functioning of southern African estuarine systems can be placed into two major categories; those changes that have been driven by global forces such as climatic and sea-level fluctuations, and those that have resulted from direct... -
Grazing behaviour and diet selection of Barotse cattle on a communally grazed floodplain in west Zambia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: RMT Baars JJ OttensGrazing behaviour and diet selection of cattle were studied on a communally grazed floodplain and its adjacent wooded uplands in western Zambia to identify the interaction between basic herd management practices, foraging behaviour and body condition of cattle. On average,... -
The effect of supplements of crop residues based diets on the performance of steers grazed on natural pasture during the dry season
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: EM AregheoreTwenty-four White Fulani steers, 20-26 months old, mean initial live weight of 270.6 ± 0.5kg, were divided into three treatment groups to investigate the effects of crop residues supplementation on performance when grazed on natural pasture during the dry season... -
The quantification of grazing capacity from grazing — and production values for forage species in semi-arid grasslands of southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: HC van der Westhuizen HA Snyman WLJ van Rensburg JHJ PotgieterThe relation between rangeland condition and grazing capacity was determined along a degradation gradient. In studying agronomic values of forage species, the average production per tuft was combined with its grazing preferences, to link grazing values for species in the... -
Soil and vegetation changes across a Succulent Karoo grazing gradient
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: P C Beukes F EllisThis study describes soil and vegetation changes radiating out from a central watering point on a livestock farm in the Succulent Ceres Karoo (Tanqua). The aim was to identify possible relationships between long-term grazing pressure, and soil and vegetation properties... -
Analysis of factors affecting milk yield of Ankole cows grazed on natural range pastures in Uganda
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: S Okello EN Sabiiti HJ SchwartzEffects of seasonal rainfall (RF) and maximum temperature (Tm) variations on milk yield of Ankole cows grazed solely on range pastures were investigated. The resulting changes in herbage growth (HG), herbage yields (HY), herbage crude protein (CPh) and neutral detergent... -
Identification of key grass species under grazing in the Highland Sourveld of Natal
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C.R. Hurt --- Department of Grassland Science, Republic of South Africa M.B. Hardy --- , Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaRelative abundances of rangeland species have for many years been used to index trends in range condition following the impact of grazing. All species recorded in a botanical survey are usually classified according to their assumed reaction to grazing using... -
Habitat factors influencing the distribution of Cymbopogon validus in Mkambati game reserve, Transkei
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: SheonaE. Shackleton --- Department of Botany, Republic of South Africa C.M. Shackleton --- Department of Botany, Republic of South AfricaThe factors influencing the distribution of Cymbopogon validus in Mkambati Game Reserve were investigated using multivariate techniques. C. validus was found to be present on nutrient‐rich, clay soils and absent from dystrophic, sandy soils. This could account for the patchy... -
The grazing index method of range condition assessment
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: P.C.V. du Toit --- Department of Agriculture, Republic of South AfricaOwing to the difficulty of examining succession theory in the Karoo, it is suggested the ecological index method (EIM), be replaced by the grazing index method (GIM), through the introduction of grazing index values (GIV) for Karoo plant species. The... -
Species responses to grazing in the Smaldeel area of the Eastern Cape1
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J.C. Martens --- , Republic of South Africa J.E. Danckwerts --- , Republic of South Africa P.J.K. Zacharias --- Department of Grassland Science, Republic of South AfricaSpecies composition of the grass layer was measured in plots selected to cover a wide spectrum of condition states in six range types. This was achieved by placing 257 sample plots along contrasting fence‐lines in adjacent plots on either side... -
Towards the development of a bioeconomic stocking model for the semi‐arid savanna of KwaZulu‐Natal
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G.P. Hatch --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South Africa G.F. Ortmann --- Department of Agricultural Economics, South AfricaRainfall variability is a major determinant of system dynamics and profitability of livestock enterprises in arid and semi‐arid environments. Range managers consequently require detailed information on the financial and ecological implications of various stocking strategies in order to formulate viable... -
Description of a method for assessing veld condition in the Karoo
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: P.C.V. du Toit --- , Republic of South AfricaIn the past, veld condition in the Karoo was assessed according to the ecological index method. This has recently been replaced by the grazing‐index method. The principles governing the method of botanical survey remain the same, but this methodology has... -
Which grazing management practices are most appropriate for maintaining biodiversity in South African grassland?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: TG O'Connor --- , South Africa P Kuyler --- Centre for Environmental Management, Faculty of Natural and Agricultural Sciences, South Africa KP Kirkman --- School of Biological and Conservation Sciences, South Africa B Corcoran --- , South AfricaThe relative benefit of different grazing management practices for maintaining grassland biodiversity integrity was assessed. Practices considered were grazing system, stocking rate, animal type, grazing season, fire–grazing interaction, plus burning regime. Sparse empirical data indicated that stocking rate, cattle-to-sheep ratio,... -
Biomass production and water use efficiency of grassland in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AR Palmer --- , South Africa A Short --- , South Africa IAM Yunusa --- , AustraliaUsing the results from a long-term grazing trial in the Dry Highland Sourveld of the KwaZulu-Natal province, we prepared a water use efficiency value (the ratio of the increment in annual biomass to total annual evapotranspiration) for this rangeland type... -
Impact of Prosopis (mesquite) invasion and clearing on the grazing capacity of semiarid Nama Karoo rangeland, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: T Ndhlovu --- Department of Conservation Ecology and Entomology, South Africa SJ Milton-Dean --- DST/NRF Centre of Excellence at the Percy FitzPatrick Institute of African Ornithology, South Africa KJ Esler --- Department of Conservation Ecology and Entomology, South AfricaWe assessed the impact of Prosopis invasion and clearing on the grazing capacity of heavily grazed Nama Karoo rangeland in the Beaufort West district of the Western Cape province of South Africa. Invasion (c. 15% Prosopis canopy cover) reduced grazing... -
Herbaceous plant species richness and composition in moist Midlands Mistbelt Grasslands in KwaZulu-Natal: is there a relationship to veld condition?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: P Ngwenya --- , South AfricaThis study investigated the relationship between grazing veld condition and herbaceous plant species richness in the moist Midlands Mistbelt Grassland in KwaZulu-Natal. The observed herbaceous plant species richness and composition of 12 sample plots (50 m × 50 m) was... -
The good shepherd: remedying the fencing syndrome
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Monique Salomon --- Farmer Support Group, South Africa Clement Cupido --- Agricultural Research Council–Animal Production Institute, c/o Department of Biodiversity and Conservation Biology, South Africa Igshaan Samuels --- Agricultural Research Council–Animal Production Institute, c/o Department of Biodiversity and Conservation Biology, South AfricaIn this paper the use of fenced grazing camps to manage the rangeland commons is challenged. A historical perspective is presented on fencing and rotational grazing in South Africa. Two case studies in KwaZulu-Natal and the Northern Cape illustrate the... -
Identifying key grazing indicators to monitor trends in the veld condition of Lambert's Bay Strandveld, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Nelmarie Saayman --- Directorate: Plant Science, South Africa Craig Morris --- Agricultural Research Council–Animal Production Institute, South Africa Hannes Botha --- Directorate: Plant Science, South AfricaCurrently, the methods used to assess the veld condition of the Lambert's Bay Strandveld along the West Coast of South Africa require that the operator knows all the plants encountered in the survey area. In this study data were collected... -
Provincial road condition and round wood timber transport in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: StephenJ. Nicholls ReinoE. Pulkki PierreA. AckermanThe context of the study is the concern over declining provincial road conditions due to insufficient government funding for road maintenance. The roads are used by a wide variety of commercial and private interests that contribute a broad range of... -
Training of Professional Psychologists for Africa: Community Psychology or Community Work?
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Olaniyi Bojuwoye --- University of Kwazulu-Natal, South AfricaIf the practice of psychology is to be relevant to environmental realities and context sensitive then conscious consideration must be given to the psychology training programme. Training programmes should give due recognition to the historical, political, social, economic and cultural... -
Job Demands and Resources, Psychological Conditions, Religious Coping and Work Engagement of Reformed Church Ministers
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Sebastiaan Rothmann --- North-West University, South Africa Chenelle Buys --- North-West University, South AfricaThis study investigated the relation between job demands and resources, psychological conditions, religious coping and work engagement of Reformed Church ministers. A cross-sectional survey design was used. Participants were 115 Reformed Church ministers (age range = 25 to 65, Afrikaans... -
There is No Lattice Preserving Natural Tensor Norm
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Pérez-García Ignacio VillanuevaWe prove that for every natural tensor norm α, one can find a Banach lattice X such that the tensor product X ⊗ X endowed with the norm α does not have the Gordon-Lewis property and, therefore, cannot be isomorphic... -
The canonical spectral measure and köothe function spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jos´e Bonet Susumu Okada WernerJ. RickerThe theme of this paper is the interaction between analytic properties of (Fréchet) Köthe function spaces X and measure/operator theoretic properties of the canonical spectral measure Q acting in X. For instance, Q is boundedly σ-additive iff X is Montel... -
Some banach space properties of E φ [0, 1]
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Diomedes BárcenasWe prove several Banach spaces properties of E φ [0, 1], many of them concerning to the Δ2 condition and the presence of c 0 and l 1 in those Banach spaces. -
European basket option pricing by maximizing over a subset of lower bounds
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: W. Mudzimbabwe --- Department of Mathematics and Applied Mathematics, South Africa K.C. Patidar --- Department of Mathematics and Applied Mathematics, South Africa P.J. Witbooi --- Department of Mathematics and Applied Mathematics, South AfricaIn this paper we derive a lower bound for the price of a European basket option under the Black and Scholes framework. The bound is based on the conditioning method of [L.C.G. Rogers and Z. Shi, The value of an... -
Efficient spectral-Petrov-Galerkin methods for third- and fifth-order differential equations using general parameters generalized Jacobi polynomials
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: W.M. Abd-Elhameed --- Department of Mathematics, Faculty of Science, Saudi Arabia E.H. Doha --- Department of Mathematics, Faculty of Science, Giza-Egypt Y.H. Youssri --- Department of Mathematics, Faculty of Science, Giza-EgyptTwo new families of general parameters generalized Jacobi polynomials are introduced. Some efficient and accurate algorithms based on these families are developed and implemented for solving third- and fifth-order differential equations in one variable subject to homogeneous and nonhomogeneous boundary... -
Necessary and sufficient conditions for approximate strong invariance for semilinear differential inclusions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Alina Ilinca Lazu --- Department of Mathematics, Romania Victor Postolache --- Department of Mathematics, RomaniaWe establish necessary and sufficient conditions for approximate strong invariance referring to semilinear differential inclusions, conditions expressed in terms of a suitable defined tangency concept. -
Perceptions of HIV/AIDS leaders about faith-based organisations’ influence on HIV/AIDS stigma in South Africa
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Mpoe Johannah Keikelame --- Directorate of Primary Health Care, Faculty of Health Sciences, South Africa ColleenK Murphy --- , United States KarinE Ringheim --- , United States Sara Woldehanna --- , United StatesThe extent of the HIV pandemic—particularly in the hardest-hit countries, including South Africa—has prompted a call for greater engagement of all groups, including faith-based organisations (FBOs). Although FBOs are known to play a substantial role in providing care and support... -
Human-rights perspectives on caregiving of people with HIV: the case for the Kanye home-based care programme, Botswana
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: SimonM Kang'ethe --- Department of Adult Education, Centre for Continuous Education, BotswanaThe article discusses the human rights associated with caregiving to people with HIV or AIDS, based on empirical findings about a community home-based care programme in Kanye, Botswana. The study was explorative in nature and qualitative in design and used... -
Courting success in HIV/AIDS prevention: the challenges of addressing aconcentrated epidemic in Senegal
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: EllenE Foley --- , United States Rokhaya Nguer --- , SenegalThis article presents findings from a study of HIV/AIDS programmes for urban sex workers in Dakar, Senegal. The objective of the research was to assess HIV prevention and treatment efforts to date, and to identify challenges that must be overcome... -
An assessment of the fish population of the lower reaches of the Sanyati River, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: W MhlangaThe fish population of the lower reaches of the Sanyati River was studied using multifilament gillnets and monthly sampling was conducted over 13 consecutive months. A total of 15 fish species belonging to seven families were collected and variations in... -
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... -
The biology of Barbus mattozi Guimaraes (Teleostei: Cyprinidae) in a Zimbabwean reservoir. 2. Growth
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BG Donnelly --- Department of National Parks and Wildlife Management, Zimbabwe BE Marshall --- Department of Biological Sciences, ZimbabweThe growth of Barbus mattozi was investigated in the Mtsheleli Dam, a small Zimbabwean reservoir. Scale rings were found to be a suitable method of determining growth, the rings being laid down in October, just before the rainy season. There... -
The breeding biology of the southern barred minnow Opsaridium peringueyi (Gilchrist and Thompson 1913) in the Incomati and Luvuvhu river systems, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PSO Fouché --- Zoology Department, South Africa JA Venter --- School of Biological and Conservation Sciences, South AfricaData collected at two sites in the Luvuvhu and Sabie rivers show that, based on the gonadosomatic index, Opsaridium peringueyi has one major annual breeding event that occurs in early summer, following a period during which the general condition of... -
Estimating the lipid content of pelagic fish in the southern Benguela by visual assessment of their mesenteric fat
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD van der Lingen L HutchingsA technique to estimate the lipid content of anchovy Engraulis encrasicolus and sardine Sardinops sagax using visual assessments of mesenteric fat is described. Anchovy are allocated to one of five and sardine to one of seven fat stages, depending upon... -
Spionid polychaetes infesting cultured abalone Haliotis midae in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Simon A Ludford S WynneA study was conducted to identify and quantify the spionid polychaetes that infest cultured abalone Haliotis midae at aquaculture facilities on the west (Farm A), south (Farms B and C) and east (Farm D) coasts of South Africa. The relationship... -
Density-dependent changes in reproductive parameters and condition of southern Benguela sardine Sardinops sagax
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD van der Lingen P Fréon TP Fairweather JJ van der WesthuizenThe sardine Sardinops sagax population in the southern Benguela has undergone substantial fluctuations in size over the past 50 years, collapsing from an apparently large population in the 1950s to low levels in the mid-1960s, remaining low for the next... -
First report of Phoronis ovalis from Africa and its effect on mussel hosts
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JL Ruesink --- Department of Biology, USA AC Trimble --- Department of Biology, USAPhoronis ovalis is a cosmopolitan, shell-boring phoronid worm reported from 24 locations worldwide in temperate latitudes, but not previously from Africa. We identified a shell-boring phoronid in Namibia that is morphologically similar to P. ovalis and subsequently surveyed its latitudinal... -
Growth and survival of the South African scallop Pecten sulcicostatus in suspended culture
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DCZ Arendse --- Department of Agriculture, Forestry and Fisheries, South Africa GC Pitcher --- Department of Agriculture, Forestry and Fisheries, South AfricaGrow-out studies of the scallop Pecten sulcicostatus, endemic to the South African coast, contribute to an investigation of the suitability of this species for commercial culture. Hatchery-reared juvenile scallops were placed in a suspended culture system at 5 m depth... -
Gonadal cycle of the dwarf oyster Ostreola stentina from the south of the Gulf of Hammamet on the eastern coast of Tunisia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: I Ben Salah --- Laboratoire de Biodiversité et Ecosystèmes Aquatiques, Tunisie A Bouain --- Laboratoire de Biodiversité et Ecosystèmes Aquatiques, Tunisie L Neifar --- Laboratoire de Biodiversité et Ecosystèmes Aquatiques, TunisieThe reproductive cycle of the dwarf oyster Ostreola stentina (Payraudeau 1826) at Monastir in the south of the Gulf of Hammamet on the east coast of Tunisia was studied using condition indices and histological techniques. The species was shown to... -
Gender Earnings Disparity and Discrimination in Urban China: Unconditional Quantile Regression
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Yao Tang --- School of Sociology and Social Policy, UK Wenjin Long --- School of Sociology and Social Policy, UKMarket-oriented economic reform has gone through several key stages to bring substantial changes to the current Chinese economy. It accelerated after 1992, and ushered in the pattern transformation since ‘scientific development outlook’ raised in 2002. During this dramatic and complicated... -
Local community perception of joint forest management and its implications for forest condition: the case of Dambwa Forest Reserve in southern Zambia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: M Phiri --- Forestry Department, Zambia Forest Research Division, Zambia PW Chirwa --- Faculty of Natural and Agricultural Sciences, South Africa S Watts --- , South Africa S Syampungani --- School of Natural Resources, ZambiaThis study conducted at Dambwa Forest Reserve in Livingstone, Zambia, evaluated the perception of local people about joint management of the forest reserve in the area and if there had been improvements to the livelihoods of the community and the... -
Women's health, HIV/AIDS and the workplace in South Africa
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Courtenay SpragueThis work explores the connections between gender inequality, HIV/AIDS and women's health in the world of work in South Africa. These connections are located within a context of significant reversals in development, specifically declining life expectancy and premature mortality for... -
A model for understanding the relationship between stigma and healthcare-seeking behaviour among people living with HIV/AIDS in sub-Saharan Africa
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: NgoziC Mbonu --- Department of Health Promotion, The School for Public Health and Primary Care (CAPHRI), Faculty of Health, Medicine and Life Sciences, The Netherlands Bart Van den Borne --- Department of Health Promotion, The School for Public Health and Primary Care (CAPHRI), Faculty of Health, Medicine and Life Sciences, The Netherlands NanneK De Vries --- Department of Health Promotion, The School for Public Health and Primary Care (CAPHRI), Faculty of Health, Medicine and Life Sciences, The NetherlandsPeople living with HIV or AIDS (PLHIV) in sub-Saharan Africa sometimes have care-seeking behaviours that result in a suboptimal quality of life. This paper seeks to examine the role of stigma in the care-seeking behaviour of PLHIV. We hypothesise that... -
Rural black women's agency within intimate partnerships amid the South African HIV epidemic
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Britta Thege --- Department of Sociology, South AfricaIn a particular way, the HIV pandemic exposes the prevailing gender relations and the definitions of male and female gender roles, both in intimate relationships and in the wider society. The HIV pandemic reveals the contradictions between women's legal rights... -
Water quality in South African temporarily open/closed estuaries: a conceptual model
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GavinC Snow Susan TaljaardOf the five types of estuaries found in South Africa, temporarily open/closed estuaries comprise approximately 70% of the total. This paper provides an overview and a simple conceptual model of the water quality features and characteristics of temporarily open/closed estuaries... -
A preliminary assessment of the health status of feral populations of Chrysichthys nigrodigitatus in Lagos lagoon complex, Nigeria, using a modified Health Assessment Index protocol
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: OluwatosinM Olarinmoye EdwinO Clarke ChristopherA Kumolu-Johnson OluwatoyinJ AderinolaA 'snapshot' evaluation of the health status of feral populations of the brackish water catfish, Chrysichthys nigrodigitatus, was carried out in 2006 at four locations in the Lagos lagoon complex, with varying levels of anthropogenic impacts, using a modified Health... -
Mass on arrival of rockhopper penguins at Marion Island correlated with breeding success
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RJM Crawford AB Makhado L Upfold BM DyerFor rockhopper penguins Eudyptes chrysocome at Marion Island, there were significant decreases over time in the numbers breeding and breeding success at three monitored colonies from 1985/1986 to 2006/2007, and in mass on arrival for breeding of both males and... -
A multidisciplinary study of a small, temporarily open/closed South African estuary, with particular emphasis on the influence of mouth state on the ecology of the system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield JB Adams GC Bate K Bezuidenhout TG Bornman PD Cowley PW Froneman PT Gama NC James B Mackenzie T Riddin GC Snow NA Strydom S Taljaard AI Terörde AK Theron JK Turpie L van Niekerk PD Vorwerk TH WooldridgeIn 2005/2006 a multidisciplinary research programme that included studies on the hydrodynamics, sediment dynamics, macronutrients, microalgae, macrophytes, zoobenthos, hyperbenthos, zooplankton, ichthyoplankton, fish and birds of the temporarily open/closed East Kleinemonde Estuary was conducted. Particular attention was given to the responses... -
Livestock grazing behaviour along a degradation gradient in the Somali region of eastern Ethiopia
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Amaha Kassahun HA Snyman GN SmitLivestock grazing behaviour is poorly understood in the arid rangelands of Ethiopia, resulting in inadequate rangeland management and grazing systems, which are no improvement on the traditional practices by pastoralists. This study aimed at quantifying the influence of rangeland degradation... -
Fischer's Diagonal Condition for Lattice-Valued Convergence Spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Gunther JägerWe study a generalization of a diagonal condition which classically ensures that a convergence space is topological. We show that only under an additional condition, which classically is always true, the validity of this diagonal condition implies that a Heyting... -
Stability on Local Unconditional Structure and the Gordon-Lewis Property in Tensor Products
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: D. Puglisi G. SaluzzoWe show that if X is an L 1-space (resp. L ∞-space) and Y a Banach space, then X ⊗∧ Y (resp. X ⊗∨ Y) has the local unconditional structure (l.u.st.) property (or GL-property) if Y does. -
Linking forest tenure and anthropogenic factors with institutions and the effectiveness of management in Mpigi forests, central Uganda
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: N Turyahabwe CJ Geldenhuys S Watts M TweheyoThis paper reveals the investigated effects of forest tenure and physical and socioeconomic correlates on conservation and management of forests in the Mpigi District, central Uganda. Tree diversity was surveyed in 156 nested plots of 20 m × 50 m... -
A condition index for African penguin Spheniscus demersus chicks
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Lubbe --- Animal Demography Unit, Department of Biological Sciences, South Africa LG Underhill --- Animal Demography Unit, Department of Biological Sciences, South Africa LJ Waller --- Animal Demography Unit, Department of Biological Sciences, South Africa J Veen --- VEDA Consultancy, The NetherlandsThe body condition of altricial seabird chicks is directly related to the amount of food received from their parents, which depends on feeding conditions at sea. An index of body condition is therefore a useful tool for assessing variation in... -
On the existence and approximation of fixed points for Ćirić type contractive mappings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: B. Djafari-Rouhani --- Department of Mathematical Sciences, USA Sirous Moradi --- Department of Mathematics, IranLet (X, d) be a complete convex metric space, and C be a nonempty, closed and convex subset of X. We consider Ćirić type contractive self-mappings T of C satisfying: for all x, y ∈ C, where 0 < a... -
Water temperature affects life-cycle duration of tadpoles of Natal cascade frog
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NA Rivers-Moore --- Centre for Water Resources Research, South Africa RJ Karssing --- Ezemvelo KZN Wildlife, South AfricaDirect and indirect effects of climate change on amphibians include range shifts and changes in community structure. The Natal cascade frog Hadromophryne natalensis has an altitudinal range of some 2 400 m in KwaZulu-Natal, and presents an opportunity to assess... -
Population dynamics of potentially harmful algal blooms in Bizerte Lagoon, Tunisia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Bouchouicha Smida --- Laboratoire de Cytologie Végétale et Phytoplanctonologie, Département des Sciences de la Vie, Faculté des Sciences de Bizerte, Tunisie I Sahraoui --- Laboratoire de Cytologie Végétale et Phytoplanctonologie, Département des Sciences de la Vie, Faculté des Sciences de Bizerte, Tunisie B Grami --- Laboratoire de Cytologie Végétale et Phytoplanctonologie, Département des Sciences de la Vie, Faculté des Sciences de Bizerte, Tunisie H Hadj Mabrouk --- Laboratoire de Cytologie Végétale et Phytoplanctonologie, Département des Sciences de la Vie, Faculté des Sciences de Bizerte, Tunisie A Sakka Hlaili --- Laboratoire de Cytologie Végétale et Phytoplanctonologie, Département des Sciences de la Vie, Faculté des Sciences de Bizerte, TunisieThe population dynamics of potentially harmful phytoplankton in the semi-closed, coastal Bizerte Lagoon, Tunisia, in the south-western Mediterranean, were examined from November 2007 to February 2009 at six sampling stations, three situated in areas of mussel and oyster farming. The... -
The influence of South Africa's post-apartheid land reform policies on bush encroachment and range condition: a case study of Fort Beaufort's municipal commonage
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: James R Puttick --- Plant Conservation Unit, Department of Biological Sciences, South Africa M Timm Hoffman --- Plant Conservation Unit, Department of Biological Sciences, South Africa James Gambiza --- Department of Environmental Science, South AfricaWe examined the effect of changes in land use and land tenure on bush encroachment and vegetation condition. An analysis of aerial photographs from three time steps (1949, 1985 and 2004) was used to document changes in woody plant density... -
Doctors' views of working conditions in rural hospitals in the Western Cape
Item type: Journal Article • Journal: South African Family Practice • Authors: MR De Villiers --- Department of Family Medicine and Primary Care, Faculty of Health Sciences, PJT De Villiers --- Department of Family Medicine and Primary Care, Faculty of Health Sciences,There has been a lively debate in the media about working conditions in rural South African hospitals, with a particular focus on staffing and quality of care. From a medical perspective, it has been stated that poorly equipped and managed... -
Systemic isotretinoin in the management of acne—a patient questionnaire survey
Item type: Journal Article • Journal: South African Family Practice • Authors: S Burger --- Drug Utilization Research Unit, Department of Pharmacy, South Africa I Truter --- Drug Utilization Research Unit, Department of Pharmacy, South Africa SM Blignault --- Drug Utilization Research Unit, Department of Pharmacy, South Africa DJL Venter --- Department of Statistics, South AfricaBackground: The primary aim was to investigate the appropriateness (as outlined in the South African Acne Treatment Guideline1) for the prescription of systemic isotretinoin in the management and counselling of acne in the Nelson Mandela Bay Metropole. -
The prevalence of erectile dysfunction at a primary healthcare clinic in Durban, KwaZulu-Natal
Item type: Journal Article • Journal: South African Family Practice • Authors: Y Lockhat --- King Dinuzulu Hospital, A Ross --- Department of Family Medicine, P Ramlachan --- University of Sydney, Australia C Rangiah --- Department of Family Medicine,Objectives: The objectives of this study were to determine the prevalence of erectile dysfunction (ED) in men attending a primary healthcare (PHC) clinic in Durban, KwaZulu-Natal, and to document any relationship between ED and age, smoking, economic status and co-morbid... -
Consultation outcomes for musculoskeletal conditions at two community health centres in Cape Town
Item type: Journal Article • Journal: South African Family Practice • Authors: MK Namane --- Metro District Health Services, Western Cape Department of Health, Community Health Division and Family Medicine Division, Faculty of Health Sciences, Stellenbosch and Family Medicine Division, Faculty of Health Sciences, AA Kalla --- Head of Unit, Rheumatic Diseases Unit, Faculty of Health Sciences, TN Young --- Centre for Evidence-Based Medicine, Community Health Division Faculty of Health Sciences,Objectives: To compare the proportion of patients with documented diagnoses and management plans when they presented with musculoskeletal complaints at two community health centres (CHCs) using two models of care: one with a rheumatology outreach service and the other with... -
Water and habitat quality assessment in the Honi and Naro Moru rivers, Kenya, using benthic macroinvertebrate assemblages and qualitative habitat scores
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JG Mbaka --- Department of Biological Sciences, Kenya CM M'Erimba --- Department of Biological Sciences, Kenya HK Thiongo --- Department of Natural Resources, Kenya JM Mathooko --- Global Research Akademik and Mentoring Services, KenyaAn assessment of water and habitat quality, based on macroinvertebrate assemblage indices and qualitative habitat scores (QHS), was undertaken in the Honi and Naro Moru rivers, Kenya, in 2011. The two rivers are important as water sources for the local... -
Conditions frequently self-treated with herbal remedies by patients visiting a tertiary hospital in Gauteng, South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: André Marais --- Faculty of Health Sciences, School of Medicine, Department of Pharmacology, South Africa Vanessa Steenkamp --- Faculty of Health Sciences, School of Medicine, Department of Pharmacology, South Africa Wim J Du Plooy --- Department of Pharmacology and Therapeutics, South AfricaBackground: Herbal medications are used worldwide for a variety of diseases and conditions. Patients often elect not to disclose their herbal use history, or health care practitioners fail to enquire about specific alternative therapy. The aim of this study was... -
Are melanistic populations of the Karoo girdled lizard, Karusasaurus polyzonus, relics or ecotypes? A molecular investigation
Item type: Journal Article • Journal: African Zoology • Authors: Hanlie M. Engelbrecht --- Department of Botany and Zoology, South Africa P. le Fras N. Mouton --- Department of Botany and Zoology, South Africa Savel R. Daniels --- Department of Botany and Zoology, South AfricaIt has been proposed that melanism in cordylids evolved in response to a single climatic event and that melanistic populations of Karusasaurus polyzonus are relictual. This study investigates the genetic relationships of melanistic and non-melanistic populations of K. polyzonus along... -
Grazing depletes forb species diversity in the mesic grasslands of KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Rob Scott-Shaw --- Ezemvelo KZN Wildlife, South Africa Craig D Morris --- Agricultural Research Council–Animal Production Institute, South AfricaForbs constitute over 80% of the species richness of mesic grassland but their response to grazing is largely unknown. The influence of grazing on the forb composition, richness and diversity of two species-rich grasslands in the coastal hinterland and midlands... -
The impact of high temperatures on foraging behaviour and body condition in the Western Australian Magpie Cracticus tibicen dorsalis
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Emily K Edwards --- School of Animal Biology, Australia Nicola J Mitchell --- School of Animal Biology, Australia Amanda R Ridley --- Centre for Evolutionary Biology, School of Animal Biology, AustraliaHigh temperatures can pose significant thermoregulation challenges for endotherms, and determining how individual species respond to high temperatures will be important for predicting the impact of global warming on wild populations. Animals can adjust their behaviour or physiology to cope... -
Softwood sawlog secondary transport travel speed prediction for the South African forestry industry
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Pierre A Ackerman --- Department of Forest and Wood Science, South Africa Reino E Pulkki --- Department of Forest and Wood Science, South Africa Elizabeth Gleasure --- Department of Forest and Wood Science, South AfricaThe objective of this study was to develop a predictive model for travel speed of softwood sawlog timber transport (STT) vehicles over a range of forest and provincial roads of varying condition for the South African forestry industry. Data was... -
A Note: The SAICA Part I Qualifying Examinations: Factors that may influence candidates’ success
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: E van Wyk --- Department of Accountancy,The study investigates certain factors characterising successful and unsuccessful candidates in the 2009 and 2010 SAICA Part I Qualifying Examination (QE I) with the purpose of making recommendations to candidates, educators, training centres and to SAICA. The study also aims... -
Mergers and Acquisitions in Africa: A Review and an Emerging Research Agenda
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Kimberly M. Ellis --- Florida Atlantic University, Management Programs, USA Bruce T. Lamont --- Florida State University, Entrepreneurship, Strategy, and Information Systems, USA Taco H. Reus --- Erasmus University, Strategic Management and Entrepreneurship, the Netherlands Leon Faifman --- Florida Atlantic University, Management Programs, USAThis article identifies and reviews existing merger and acquisition (M&A) studies focused on African markets. In this review, the factors mentioned directly or alluded to in the existing studies that distinguish African countries as target nations from other countries traditionally... -
All at sea: Insights into crew work experiences on a cruise liner
Item type: Journal Article • Journal: • Authors: Ester Ellen Trees Bolt --- Academy of International Hospitality Research, Stenden University of Applied Sciences, Leeuwarden, The Netherlands Conrad Lashley --- International Hotel Management School, Stenden University of Applied Sciences, Leeuwarden, The NetherlandsThis research explores employee experiences of working on board a cruise ship. Cruise liners have been described as floating hotels; but increasingly they are more like floating resorts, embracing passenger and crew populations as big as small towns. In addition to the... -
The impact of livestock grazing management systems on soil and vegetation characteristics across savanna ecosystems in Botswana
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Olaotswe E Kgosikoma --- Department of Agricultural Research, Botswana Witness Mojeremane --- Botswana College of Agriculture, Botswana Barbra Harvie --- University of Edinburgh, UKThe objective of this study was to determine the impact of livestock grazing management systems on soil and vegetation dynamics under different environmental conditions of Botswana. Soil and vegetation were randomly sampled along transects located in three ranches and adjacent... -
Long-term response of an herbaceous sward to reduced grazing pressure and rainfall variability in a semi-arid South African savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Tim G O'Connor --- SAEON, South AfricaReduced grazing pressure is expected to promote recovery of degraded semi-arid savanna. Transformation of degraded livestock ranches to a wildlife reserve in 1982 created a system with about one-third of the grazing pressure, which was maintained until 2011. Herbaceous composition... -
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,... -
An assessment of the reproductive biology of the Marico barb Barbus motebensis from the upper Groot Marico catchment, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: D Kindler --- Department of Zoology, South Africa GM Wagenaar --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa OLF Weyl --- Centre for Invasion Biology, SAIAB, South AfricaBarbus motebensis is endemic to the Groot Marico River catchment in the North West province, South Africa, and is considered of particular conservation importance due to being Red-Listed as Vulnerable. Due to its vulnerable conservation status, the aim of this... -
The use of cash transfers for HIV prevention — are we there yet?
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Jessica Taaffe --- The World Bank Group, USA Nejma Cheikh --- The World Bank Group, USA David Wilson --- The World Bank Group, USAPoverty and social inequality are significant drivers of the HIV epidemic and are risk factors for acquiring HIV. As such, many individuals worldwide are at risk for new HIV infection, especially young women in East and Southern Africa. By addressing... -
The effects of fire-breaks on plant diversity and species composition in the grasslands of the Loskop Dam Nature Reserve, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Laura M Bachinger --- Department of Plant Science, South Africa Leslie R Brown --- Applied Behavioural Ecology and Ecosystem Research Unit, Department of Environmental Sciences, South Africa Margaretha W van Rooyen --- Department of Plant Science, South AfricaThere is a dearth of knowledge on the effects of annual burning of fire-breaks on species composition, plant diversity and soil properties. Whittaker's plant diversity technique was used to gather data on species composition and diversity in four grassland communities... -
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... -
Mytilus galloprovincialis (Mollusca: Bivalvia) in a warm-temperate South African estuarine embayment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Pollard --- Department of Zoology and Entomology, Knysna Basin Project, South Africa AN Hodgson --- Department of Zoology and Entomology, Knysna Basin Project, South AfricaThe distribution, population structure, condition and gonad indices, and the attachment strengths of the invasive Mediterranean mussel Mytilus galloprovincialis are described from the Knysna Estuary, South Africa. Mussels were found in the rocky intertidal at the mouth of the estuary... -
Psychological availability and work engagement: The moderating role of sex and race
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karolina Łaba --- Department of Industrial Psychology and People Management, South Africa Madelyn Geldenhuys --- Department of Industrial Psychology and People Management, South AfricaThis study sought to determine the relationship of sex and race as moderators of psychological availability on work engagement in various South African organisations. Participants were 1 059 employees predominantly from the corporate sector in Gauteng province (females = 61%,... -
Investigation of the coexistence of CKD and non-communicable chronic diseases in a PBM company in South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: WP Meuwesen --- Medicine Usage in South Africa (MUSA), South Africa JM du Plessis --- Medicine Usage in South Africa (MUSA), South Africa JR Burger --- Medicine Usage in South Africa (MUSA), South Africa MS Lubbe --- Medicine Usage in South Africa (MUSA), South Africa M Cockeran --- Medicine Usage in South Africa (MUSA), South AfricaBackground: Chronic kidney disease (CKD) is a public health problem, with increasing global prevalence. Several factors could influence the prognosis of CKD, including comorbid chronic conditions. This study investigated the coexistence of CKD and non-communicable chronic diseases in the private... -
Suspended silt and salinity tolerances of the first zoeal stage of the fiddler crab Uca annulipes (Decapoda: Brachyura) and why marine connectivity is essential to the survival of the species
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Peer --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa NAF Miranda --- DST/NRF Research Chair in Shallow Water Ecosystems, South Africa R Perissinotto --- DST/NRF Research Chair in Shallow Water Ecosystems, South AfricaFiddler crabs (Uca spp.) undergo the zoeal stage of development in open-ocean waters, where they experience stable salinity levels, low turbidity and reduced predation. The St Lucia estuarine system has undergone many geomorphological changes, both natural and anthropogenic, and the... -
Effect of management on rangeland phytomass, cover and condition in two biomes in South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Roelof J Oomen --- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Germany Anja Linstädter --- Range Ecology and Range Management Group, Germany Jan C Ruppert --- Range Ecology and Range Management Group, Germany Katharina Brüser --- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Germany Jürgen Schellberg --- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Germany Frank Ewert --- Institute of Crop Science and Resource Conservation (INRES), University of Bonn, GermanyIn rangelands, grazing management is a main driver of rangeland condition. Due to masking effects of seasonal climate fluctuations, little is known about (dis)similarity of management effects on rangeland condition and forage provision across major dryland biomes. Taking a macro-ecological... -
Anaesthesia for left thoracoscopic sympathectomy for refractory long QT syndrome: three case reports
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Madhusudan Upadya --- Department of Anaesthesia, India Julie CR Misquith --- Department of Anaesthesia, India Rammoorthi Rao --- Department of Anaesthesia, IndiaCongenital long QT syndrome (LQTS) is a rare genetic disorder that has been associated with various genetic mutations including life-threatening cardiac arrhythmias and sudden death. Left thoracoscopic sympathectomy is an effective treatment for patients who are refractory to medical therapy... -
A machine survival time-based maintenance workforce allocation model for production systems
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: D.E. Ighravwe --- Department of Mechanical Engineering, Nigeria S.A. Oke --- Department of Mechanical Engineering, NigeriaToday’s maintenance workforce operates in a complex business environment and relies on metrics that indirectly link equipment breakdown, fluctuating production rate, demand uncertainties and fluctuating raw material requirements. This has triggered a change in the scope as well as the... -
Aspects of reproduction of the brown mussel Perna perna at the Iture rocky beach near Cape Coast, Ghana
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EA Krampah --- Department of Fisheries and Aquatic Sciences, Ghana K Yankson --- Department of Fisheries and Aquatic Sciences, Ghana J Blay --- Department of Fisheries and Aquatic Sciences, GhanaAspects of the reproductive biology of the brown mussel Perna perna at the Iture rocky beach near Cape Coast, Ghana, were studied from September 2014 to August 2015. The current study was aimed at providing information useful for managing the... -
Livestock grazing has minimal effect on the species richness and diversity of semi-arid shrubland in the Western Little Karoo, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Nelmarie Saayman --- Directorate of Plant Sciences, Western Cape Department of Agriculture, South Africa Craig Morris --- Agricultural Research Council–Livestock Business Division, Range and Forage Unit, c/o School of Biological and Conservation Sciences, South Africa Hannes Botha --- Directorate of Plant Sciences, Western Cape Department of Agriculture, South AfricaThe Succulent Karoo, one of two arid biodiversity hotspots in the world, is known for its high plant species richness, but little is known about the influence of topography and how it mediates the potentially deleterious effects of grazing. Changes... -
The effect of conditioning and natural aeration methods on rate of moisture loss and crude protein content of Lablab purpureus herbage during hay-making
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Godfrey Manyawu --- International Livestock Research Institute, Zimbabwe Lovemore C Gwiriri --- Centre for Agroecology, UK Irenie Chakoma --- International Livestock Research Institute, Zimbabwe Siboniso Moyo --- International Livestock Research Institute, Ethiopia Sikhalazo Dube --- International Livestock Research Institute, ZimbabweThe objective of this on-farm study was to develop an effective and labour-extensive method to cure forage Lablab purpureus ‘Highworth’ for resource-constrained smallholder farmers in the Goromonzi district, Zimbabwe in 2014. In a completely randomised factorial design, the drying rate... -
Exploring the invasion of rangelands by Acacia mearnsii (black wattle): biophysical characteristics and management implications
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Onalenna Gwate --- Institute for Water Research, Rhodes University, South Africa Sukhmani K Mantel --- Institute for Water Research, Rhodes University, South Africa Andiswa Finca --- Agricultural Research Council – Animal Production Institute, South Africa Lesley A Gibson --- Department of Construction and Surveying, UK Zahn Munch --- Department of Geography and Environmental Studies, South Africa Anthony R Palmer --- Institute for Water Research, Rhodes University, South AfricaAustralian acacias have spread to many parts of the world. In South Africa, species such as A. mearnsii and dealbata are invasive. Consequently, more effort has focused on their clearing. In a context of increasing clearing costs, it is crucial... -
All at sea: Insights into crew work experiences on a cruise liner
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Ester Ellen Trees Bolt --- Academy of International Hospitality Research, Stenden University of Applied Sciences, The Netherlands Conrad Lashley --- International Hotel Management School, Stenden University of Applied Sciences, The NetherlandsThis research explores employee experiences of working on board a cruise ship. Cruise liners have been described as floating hotels; but increasingly they are more like floating resorts, embracing passenger and crew populations as big as small towns. In addition... -
An examination of boundary value transmission problem with quadratic spectral parameter
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Guler Basak Oznur --- Gazi University, Turkey Yelda Aygar --- Ankara University, Turkey Nazlim Deniz Aral --- Bitlis Eren University, TurkeyThe main purpose of this study is to examine the properties of scattering solutions and scattering function of a difference equation subject to eigenparameter-dependent boundary and transmission conditions. In general, we are interested in a boundary value problem (BVP) generated... -
Comparison of infrared thermography and miniature Deltatron accelerometer sensors in the measurement of structural vibration characteristics
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Stephen M. Talai --- Department of Mechanical Engineering, South Africa Dawood A. Desai --- Department of Mechanical Engineering, South Africa P. Stephan Heyns --- Department of Mechanical and Aeronautical Engineering, South AfricaThis paper investigates the comparison of infrared thermography (IRT) and miniature Deltatron accelerometer sensors in measuring structural vibration characteristics in terms of frequency and displacement, given that of age IRT has fully grown for temperature condition monitoring. In addition, IRT... -
Fish recruitment into a South African temporarily open/closed temperate estuary during three different hydrological mouth phases
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GP Tweddle --- Department of Zoology, South Africa PW Froneman --- Department of Zoology and Entomology, South AfricaQuantitative recruitment of ichthyofauna into a South African temporarily open/closed estuary (TOCE) was investigated during three distinct hydrological phases: closed overwash, open outflow and tidal mouth conditions. Maximum recruitment densities occurred during outflow conditions and declined when the system became... -
Population structure of the sicklefin lemon shark Negaprion acutidens within the Curieuse Marine National Park, Seychelles
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RD Hodgkiss --- Global Vision International Seychelles, Seychelles A Grant --- Global Vision International Seychelles, Seychelles JHR McClelland --- Global Vision International Seychelles, Seychelles R Quatre --- Seychelles National Parks Authority, Seychelles B Rademakers --- Global Vision International Seychelles, Seychelles C Sanchez --- Nature Seychelles, Seychelles C Mason-Parker --- Global Vision International Seychelles, SeychellesThis study produced the first data on population parameters for sicklefin lemon shark Negaprion acutidens at the granitic Seychelles Islands, adding to a limited catalogue of species information. Juveniles at a site in the Curieuse Marine National Park were tagged... -
The role of children in their HIV-positive parents’ management of antiretroviral therapy in Uganda
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Ruth Nalugya --- Medical Research Council/Uganda Virus Research Institute, Uganda Steven Russell --- School of International Development, UK Flavia Zalwango --- Medical Research Council/Uganda Virus Research Institute, Uganda Janet Seeley --- Medical Research Council/Uganda Virus Research Institute, UgandaAdjustment to life on antiretroviral therapy (ART) and living with HIV as a long-term chronic condition, pose significant medical, social and economic challenges. We investigated children’s role in supporting HIV-positive parents to self-manage life on ART. Between 2010 and 2012,... -
Alcohol use and problem drinking in South Africa: Results from a national-population-based survey 2014-2015
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- HIV/AIDS/STIs/and TB (HAST), South Africa Supa Pengpid --- Department of Research and Innovation, South AfricaThe aim of this study was to estimate the pattern of alcohol use among South African adults by their socio-demographic and health status indicators. We analysed data from a 2014–2015 South African national population-based survey which sampled 22 752 adults... -
Effect of stocking density on vegetation and animal performance within the semi-arid shrublands of the Karoo, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Christiaan J Harmse --- Northern Cape Department of Agriculture, Land Reform and Rural Development, South Africa Hannes J Gerber --- Northern Cape Department of Agriculture, Land Reform and Rural Development, South AfricaAs the primary land use in the Karoo, extensive small-stock farming contributes significantly towards the agricultural economy of the region. However, the sustainability of this practice has been questioned for many years. This led to the establishment of a long-term... -
Studies on the biology of Nile tilapia (Oreochromis niloticus) in Lake Victoria, Kenya: in light of intense fishing pressure
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: E Yongo --- Department of Fisheries and Aquatic Sciences, Kenya N Outa --- Department of Biological Sciences, Kenya K Kito --- Graduate School of Fisheries, Japan Y Matsushita --- Graduate School of Fisheries, JapanNile tilapia Oreochromis niloticus is now the most abundant and commercially important tilapiine in Lake Victoria. From the total of 1 512 fish sampled from commercial gill net fisheries during 2014 and 2015, 809 (54%) were males and 672 (44%)... -
Reproductive strategies of smooth-head catfish Clarias liocephalus (Boulenger, 1898), in the Rwizi-Rufuha wetland system, south-western Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Yatuha --- Biology Department, Uganda J Rutaisire --- National Agricultural Research Organization, Uganda L Chapman --- Department of Biology, Canada J Kang’ombe --- Bunda College of Agriculture, Malawi D Sikawa --- Bunda College of Agriculture, MalawiThe reproduction of the smooth-head catfish (Clarias liocephalus), a heavily exploited wetland fish in Uganda, in a data-deficient fishery, was studied from January to December 2011. Analyses were based on a sample of 854 fish specimens obtained from a chain... -
An analytical-numerical approach in the calculation of photovoltaic module parameters operating under partial shaded conditions
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Abdouramani Dadjé --- Department of Renewable Energy, National Advanced School of Engineering of Maroua, Cameroon Noël Djongyang --- Department of Renewable Energy, National Advanced School of Engineering of Maroua, Cameroon Réné Tchinda --- LISIE, Fotso Victor University Institute of Technology, CameroonThe aim of this work is to determine the parameters and characteristics of a PV module in case of partial shading conditions. Both numerical and analytical methods are used in order to attain this objective. The iterative method namely Newton-Raphson... -
The composition of the soil seedbank and its role in ecosystem dynamics and rehabilitation potential in the arid Tankwa Karoo Region, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Manam WB Saaed --- Higher Institute of Agricultural Techniques, Libya Shayne M Jacobs --- Department of Conservation Ecology and Entomology, South Africa Mmoto L Masubelele --- Cape Research Centre, South Africa Igshaan Samuels --- Agricultural Research Council–Animal Production, c/o Department of Biodiversity and Conservation Biology, South Africa Lesego Khomo --- Department of Environmental Sciences, South Africa Yacoub M El-Barasi --- Botany Department, Faculty of Science, LibyaVery few soil seedbank studies have been conducted in South Africa, especially in arid rangelands. Insight into the soil seedbank could therefore improve assessment of rangeland dynamics and enhance rehabilitation efforts. This study aimed to characterise the soil seedbanks in... -
Zambian Invertebrate Scoring System (ZISS): A macroinvertebrate-based biotic index for rapid bioassessment of southern tropical African river systems
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HF Dallas --- Freshwater Research Centre, Scarborough, South Africa S Lowe --- University of Glasgow, Scotland MP Kennedy --- Northern Rivers Institute, School of Geosciences, England K Saili --- Department of Geography and Environmental Studies, Zambia KJ Murphy --- University of Glasgow, ScotlandAn extensive survey of tropical rivers, conducted during 2009–2012 throughout Zambia, collected 151 samples of benthic macroinvertebrates, located on 95 rivers in six of the nine freshwater ecoregions. Associated data for physico-chemistry, human activities and ecosystem stressors were collected. Data... -
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... -
Yields of Green Grams and Pigeonpeas under Smallholder Conditions in Machakos County, Kenya
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: John Mulwa Wambua --- Department of Agricultural Economics and Agribusiness, Kenya Margaret Ngigi --- Department of Agricultural Economics and Agribusiness, Kenya Muhammad Lutta --- Kenya Agricultural and Livestock Research Organization, KenyaGreen grams and pigeonpeas have multiple benefits to the rural poor as food security, fodder for livestock and fuel for small-scale farmers, despite low smallholder yields in Kenya. However, little is known about the factors between different farmers that influence... -
Microfilarial infections associated with body mass loss of Village Weavers Ploceus cucullatus
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Andong F Atawal --- AP Leventis Ornithological Research Institute, Nigeria Anthony C Mgbeahuruike --- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Nigeria Martijn Hammers --- AP Leventis Ornithological Research Institute, NigeriaHaemoparasitic infections in wild birds have been widely studied in order to understand parasite–host relation- ships, but our understanding of their impact on the host's fitness is still limited. In this study, we quantified the associations between microfilarial infections and... -
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... -
Grandidierella lignorum (Amphipoda: Aoridae) can be used for assessing the toxicity of sediment with varying grain sizes and low organic content
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NF Masikane --- Department of Zoology, South Africa BK Newman --- Coastal Systems Research Group, Natural Resources and the Environment, South Africa UM Scharler --- School of Life Sciences, South AfricaSediment grain size and organic matter influences the distribution of macrozoobenthic fauna. These parameters also influence bioavailability and toxicity of contaminants in aquatic systems, because sediment is the sink and source for most contaminants. These sediment parameters therefore potentially confound... -
Body condition of Little Egret Egretta garzetta nestlings in relation to hatching order in a southern Tunisian breeding colony
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Amel Neb --- Unité de Recherche “Ecologie de la Faune Terrestre” (UR17ES44) – Faculté des Sciences de Gabès, Tunisia Abdessalem Hammouda --- Unité de Recherche “Ecologie de la Faune Terrestre” (UR17ES44) – Faculté des Sciences de Gabès, Tunisia Slaheddine Selmi --- Unité de Recherche “Ecologie de la Faune Terrestre” (UR17ES44) – Faculté des Sciences de Gabès, TunisiaThe effect of asynchronous hatching on nestling health and condition in ardeids is still in need of empirical evidence from populations living in different environmental conditions. Using morphometric and hematologic data from Little Egret Egretta garzetta nestlings in a Tunisian... -
The social and technical conditions enabling innovations in information infrastructures: A case study from public health in Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Masoud Hussein Mahundi --- Department of Computer Science and Engineering, Tanzania Petter Nielsen --- Department of Informatics, Norway Honest Kimaro --- Department of Computer Science and Engineering, TanzaniaOne of the hallmark characteristics of information infrastructures is their gradual evolution to adapt to changes in technologies and requirements from diverse user groups. Evolution manifests through innovations on and within infrastructures as they respond to the changes. These innovations,... -
Time varying correlations and causalities between stock and foreign exchange markets: Evidence from China, Japan and Korea
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Young K. Park --- Business School, Korea Ki Beom Binh --- Department of Economics, Korea Suk-Joong Kim --- Discipline of Finance, AustraliaThis paper examines the time-varying relationship between the stock and the foreign exchange markets for China, Japan and Korea for the period July 2005 to November 2013. The cross-market relationship within each country differs among the three countries and varies... -
A tale of records from Hakskeen Pan, the first record of Pumilibranchipus deserti Hamer and Brendonck, 1995 (Anostraca, Branchiopoda) from South Africa and the pursuit of a new world land speed record
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: E Meyer-Milne --- South African Environmental Observation Network, South Africa MC Mlambo --- Department of Freshwater Invertebrates, Albany Museum, South AfricaUntil now, Pumilibranchipus deserti was known from only one locality in Namibia. This paper reports the first record of this species from South Africa in Hakskeen Pan, Northern Cape, which represents a new, easterly range extension of the known distribution... -
Preliminary observations of the reproductive biology of the Frenchman seabream Polysteganus baissaci (Sparidae) from Mauritius
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Caussy --- Department of Biosciences and Ocean Studies, Faculty of Science, Mauritius C Appadoo --- Department of Biosciences and Ocean Studies, Faculty of Science, Mauritius WHH Sauer --- Department of Ichthyology and Fisheries Science, South Africa WM Potts --- Department of Ichthyology and Fisheries Science, South AfricaThe Frenchman seabream Polysteganus baissaci is an important commercial fish species found on the slopes of the fishing banks of the exclusive economic zone of Mauritius. Exploitation of this species started in 2007, and it is targeted using hydraulic reels... -
Effects of prolonged mouth closure in a temporarily open/closed estuary: a summary of the responses of invertebrate communities in the uMdloti Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: UM Scharler --- School of Life Sciences, South Africa K Lechman --- School of Life Sciences, South Africa T Radebe --- School of Life Sciences, South Africa HL Jerling --- Department of Zoology, South AfricaProlonged mouth closure in estuaries is often associated with hypersalinity, mainly as a result of reduced freshwater inflow. However, on the KwaZulu-Natal coast, South Africa, temporarily open/closed estuaries have a tendency towards hyposalinity during closed mouth conditions, primarily because of... -
Absent fathers: Psychological and socio-economic implications for black children and directions for future research
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Simnikiwe Magqamfana --- Department of Psychology, South Africa Sandiso Bazana --- Department of Psychology, South AfricaThis study investigated fathers’ absence influences on the self-perceptions of South African young adults. Informants were five black university students (two females, three males; age range 20 to 28 years). They responded to semi-structured face-to-face interviews on self-perceptions from having... -
Interactive effects of pH and temperature on native and alien mussels from the west coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MP Emanuel --- Marine Research Institute, Department of Biological Sciences, South Africa D Pillay --- Marine Research Institute, Department of Biological Sciences, South Africa M van der Merwe --- Centre for Higher Education Development, South Africa GM Branch --- Marine Research Institute, Department of Biological Sciences, South AfricaGlobal warming and ocean acidification influence marine calcifying organisms, particularly those with external shells. Among these, mussels may compensate for environmental changes by phenotypic plasticity, but this may entail trade-offs between shell deposition, growth and reproduction. We assessed main and... -
Mental morbidity and its associations with socio-behavioural factors and chronic conditions in rural middle- and older-aged adults in South Africa
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Supa Pengpid --- , Thailand Karl Peltzer --- , VietnamThis study investigated mental morbidity and its association with socio-behavioural health and chronic health conditions among rural middle-older persons in South African (N = 5 059 adults; females = 53.6%; mean age = 62.4 years, SD = 13.1 years). We... -
Intercolony health evaluation of wild African penguins Spheniscus demersus, in relation to parasites, along the southwest coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MPA Espinaze --- , South Africa C Hui --- , South Africa L Waller --- , South Africa S Matthee --- , South AfricaClinical parameters of African penguins Spheniscus demersus have been recorded mostly from birds admitted to rehabilitation centres and are typically presented as mean values across a region. It is uncertain whether these values are representative of wild penguins and whether... -
Accounting for land cover changes and degradation in the Katse and Mohale Dam catchments of the Lesotho highlands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jane Turpie --- , South Africa Grant Benn --- , South Africa Mark Thompson --- , South Africa Nigel Barker --- , South AfricaRangeland conditions in the Lesotho highland dam catchment areas is important for local livelihoods and regional water supply. We investigated changes in land cover and condition from 1991 (before construction) to 2013, using Landsat imagery. The Normalised Difference Vegetation Index... -
A case study of rangeland vegetation changes from 1979 to 2016 in the Middle Atlas Mountains of Morocco
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A El Aich --- , Morocco ME Fernández-Giménez --- , United States M Rouzi --- , Morocco CL Alados --- , SpainThis case study assessed changes in vegetation composition of a 0.8 ha rangeland site over the past four decades, in relation to changes in temperature and to an increase in grazing pressure. The frequency and standing crop (biomass) of species... -
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... -
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... -
Land reform and its impact on the arid South African environment: Riemvasmaak as a case study
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: GS Fleury --- , South Africa MT Hoffman --- , South Africa SW Todd --- , South AfricaThe 75 000 ha, hyper-arid area of Riemvasmaak represents one of the first land restitution cases in post-apartheid South Africa. People who were forcibly removed in 1974 were resettled in 1995. We describe the impact that people and domestic livestock... -
Are there long-term temporal trends of size composition and the length– weight relationship? Results for chokka squid Loligo reynaudii during the peak spawning season off the south coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MR Lipiński --- , South Africa MA Mmethi --- , South Africa D Yemane --- , South Africa J Githaiga-Mwicigi --- , South Africa WHH Sauer --- , South AfricaTemporal trends in the size composition (length frequency) and length–weight (L–W) relationship of chokka squid Loligo reynaudii on the south coast of South Africa were assessed over periods spanning 22 years: length frequencies from 1996 to 2017 (with 15 years... -
Investigating the effects of hypersalinity on the cardiac performance of the invasive gastropod Melanoides tuberculata (Müller, 1774)
Item type: Journal Article • Journal: African Zoology • Authors: TJ de Haas --- , South Africa LJ Connell --- , South Africa R Greenfield --- , South AfricaAnthropogenic activities have propelled the exploitation of natural environments, which along with climate change have resulted in salinity intrusion to freshwater ecosystems worldwide. To determine the extent the hypersalinity stressor has on freshwater ecosystems, physiological cardiac responses in the freshwater... -
Germination performance of different forage grass species at different salinity (NaCl) concentrations
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M Mangwane --- , South Africa IC Madakadze --- , South Africa FV Nherera-Chokuda --- , South Africa S Dube --- , Zimbabwe M Mndela --- , South AfricaCertain grasses show potential for the rehabilitation of coalmine spoils. Species selection and evaluation are used to guide the choice of the most appropriate grass species. This study evaluated the germination performance of seven forage grass species, with some represented... -
Spawning observations of Pomadasys commersonnii in the marine section of the Knysna estuarine bay, Western Cape, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- , South Africa A-R Childs --- , South Africa MKS Smith --- , South Africa RM Foster --- , South Africa WM Potts --- , South AfricaKnowledge of the location and timing of spawning events is critical for fisheries management. As is the case for many southern African fishes, the spotted grunter Pomadasys commersonnii was historically thought to reproduce in the coastal waters off KwaZulu-Natal Province... -
Macrophyte species diversity and distribution in relation to water quality of the Cheleleka Wetland in Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Haymanot Tesfaye --- , Ethiopia Bikila Warkineh --- , EthiopiaThe Cheleleka Wetland is located in the Ethiopian Rift Valley on the upper shore of Lake Hawassa, after which the regional capital is named. This study investigated the relationship between water quality and the occurrence and diversity of macrophyte species... -
Use of biological and water quality indices to evaluate conditions of the Upper uMngeni Catchment, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R van Deventer --- , South Africa CD Morris --- , South Africa TR Hill --- , South Africa NA Rivers-Moore --- , South AfricaUrban and agricultural land uses have the potential to severely compromise the quality of impoundments, if ineffectively managed and operated. A case in point is the upper uMngeni Catchment, including Midmar Dam, which is integral to the freshwater supply infrastructure... -
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... -
IoT-powered system for environmental conditions monitoring in poultry house: A case of Tanzania
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Beston Lufyagila --- , Tanzania Dina Machuve --- , Tanzania Thomas Clemen --- , GermanyPoultry health is imperative for the continued growth of poultry and increased production. Environmental conditions such as temperature, humidity, and ammonia gas have an impact on poultry health. They affect the respiratory system and eventually cause death. In Tanzania, most... -
Farm-scale digital soil mapping of soil classes in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Trevan Flynn --- , Czech Republic Andrei Rozanov --- , South Africa Freddie Ellis --- , South Africa Willem de Clercq --- , South Africa Cathy Clarke --- , South AfricaThis study involved the evaluation of farm-scale digital soil classification in the Sandspruit catchment of the Western Cape Province, South Africa. The study aimed to evaluate a digital soil mapping (DSM) method, from feature selection, spatial predictions and sample design... -
An indicator-based approach for cross-realm coastal biodiversity assessments
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LR Harris --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa AL Skowno --- South African National Biodiversity Institute (SANBI), South Africa KJ Sink --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa L van Niekerk --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa SD Holness --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa M Monyeki --- South African National Biodiversity Institute (SANBI), South Africa P Majiedt --- South African National Biodiversity Institute (SANBI), South AfricaEcosystem status assessments are generally separated into realm-specific analyses (terrestrial, freshwater, estuarine or marine), but without integrating these into a coherent assessment of coastal biodiversity across the land–sea interface. Trends in assessment indicators in coastal versus non-coastal areas have also... -
The Freshwater Biodiversity Information System (FBIS) – mobilising data for evaluating long-term change in South African rivers
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Helen Dallas --- , South Africa Jeremy Shelton --- , South Africa Tim Sutton --- , South Africa Dimas Tri Cuptura --- , South Africa Mohammed Kajee --- , South Africa Nancy Job --- , South AfricaAccess to long-term biodiversity datasets is vital for monitoring, managing and protecting freshwater ecosystems. Detecting critical ecosystem changes, such as losing unique biodiversity and ecosystem services, is dependent on access to data. A wealth of biodiversity data exists for river... -
DRIFT: incorporating an eco-social system network and time series approach into environmental flow assessments
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AR Joubert --- , South Africa CA Brown --- , South Africa JM King --- , South Africa H Beuster --- , South Africa A Greyling --- , South AfricaDRIFT (Downstream Response to Imposed Flow Transformation) is an interactive, ecological-social process and software package to assist with environmental flow assessments and river management decision-making. It was originally developed in the 1990s and has subsequently evolved and been applied in... -
Flow alterations and nutrient loading reduce primary producer variability in a temporarily closed microtidal estuary in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Monique Nunes --- , South Africa Daniel A Lemley --- , South Africa Janine B Adams --- , South AfricaPrimary producer responses to cumulative regulating factors were investigated in a temporarily closed microtidal estuary. We hypothesised that the phytoplankton chlorophyll-a concentration (Chl a) and invasive alien aquatic plant (IAAP) abundance would be highest during the low-flow season and that... -
The problem with non-separated multipoint-integral conditions for high-order differential equations and a new general solution
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Anar T. Assanova --- Institute of Mathematics and Mathematical Modeling, Kazakhstan Askarbek E. Imanchiyev --- Institute of Mathematics and Mathematical Modeling, KazakhstanThe problem with non-separated multipoint-integral conditions for high-order differential equations is considered. An interval is divided into m parts, the values of a solution at the beginning points of the subintervals are considered as additional parameters, and the high-order differential... -
Diet and condition of juvenile deep-water hake Merluccius paradoxus on the west coast of southern Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Gammon --- University of Cape Town, South Africa CL Moloney --- University of Cape Town, South Africa MR Lipinski --- Rhodes University, South AfricaThe composition of the diet of juvenile deep-water hake Merluccius paradoxus is described and compared for three body-condition groups (below-average, average, and above-average). Diet was analysed using three metrics: occurrence, numeric and gravimetric. Juvenile hakes were caught in January and... -
A new type Sturm-Liouville problem with an abstract linear operator contained in the equation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: K. Aydemir --- Amasya University, Turkey O.Sh. Mukhtarov --- Tokat Gaziosmanpaşa University, TurkeyIn this study we shall introduce to the consideration a new type Sturm-Liouville problem, which differs from the standard problems in that it contain nondifferential term in the equation. Namely, the equation contains an abstract linear operator B, which may... -
People living with HIV and AIDS in everyday conditions of township life in South Africa: between structural constraint and individual tactics
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Frédéric Le Marcis --- Department of Social Anthropology, University of Victor Segalen, Rehana Ebrahim-Vally --- University of the Witwatersrand,The HIV/AIDS pandemic in South Africa has negatively transformed the lives of many in townships and rural areas. People living with AIDS (PWAs) are the socially weakened, whose means of survival include migrating, enduring gender violence, and they are thus... -
Population ecology of Psammobates oculifer in a semi-arid environment
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Toby Keswick --- , , South Africa Margaretha D. Hofmeyr --- , , South AfricaWe studied the ecology of Psammobates oculifer over 13 months near Kimberley, South Africa, to ascertain if the population's life history traits conform to chelonian patterns in arid environments. Capture rates were highest in spring and lowest in winter when... -
Are environmental conditions in the eyes of the beholder? Foreign and local firms in Africa
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Lilac Nachum --- Baruch College, City University New York, USA Chris Ogbechie --- Lagos Business School, NigeriaInternational business research has provided substantial empirical evidence that foreign firms investing in countries with adverse environmental conditions may emerge as the main competitors in those countries. Against this backdrop, the dominance of local banks in Nigeria is puzzling. Our... -
Expansion of the Grassland Biome in the eastern Karoo corresponds with changes in rainfall and livestock numbers
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G Arena --- University of Cape Town, South Africa MT Hoffman --- University of Cape Town, South Africa H van der Merwe --- University of Cape Town, South Africa TG O’Connor --- , South AfricaThe persistent spread of shrublands is a global phenomenon observed across semiarid grassland-shrubland boundaries. Observations in South Africa, however, have detected a contrasting trend of increasing grass cover across the transition between the Nama-Karoo and Grassland Biomes over the last... -
Eigenvalues of Sturm-Liouville problems with distributional potentials and eigenparameter-dependent boundary conditions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ji-Jun Ao --- Inner Mongolia University of Technology, China Meng-Lei Li --- Inner Mongolia University of Technology, China Hai-Yan Zhang --- Inner Mongolia University of Technology, ChinaIn this paper, regular Sturm-Liouville problems with distributional potentials and eigenparameter-dependent boundary conditions are investigated. We obtain that the eigenvalues of the problems depend not only continuously but also smoothly on the parameters of the problem: the coefficients, the boundary... -
More on cardinality bounds involving the weak Lindelöf degree
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Bella --- University of Catania, Italy N. Carlson --- California Lutheran University, USA I. Gotchev --- Central Connecticut State University, USAWe give several new bounds for the cardinality of a Hausdorff topological space X involving the weak Lindelöf degree ωL(X). In particular, we show that if X is extremally disconnected, then |X| ≤ 2 ωL (X)πχ(X)ψ(X), and if X... -
Some sharpened and refined versions of the q—Steffensen inequality
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ksenija Smoljak Kalamir --- University of Zagreb, CroatiaBased on a known sharpened and refined versions of a classical Steffensen inequality, we derive new sharpened and refined versions of a q–Steffensen inequality. Next, we give weaker conditions for some already known generalizations of q–Steffensen’s inequality and for new... -
Representable and Radon-Nikodým polynomials
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Raffaella Cilia --- Università di Catania, Italy Joaquín M. Gutiérrez --- Universidad Politécnica de Madrid, SpainEvery k-homogeneous (continuous) polynomial between Banach spaces admits a unique Aron-Berner extension to the biduals. -
Approximate controllability of non-instantaneous impulsive semi-linear neutral differential equations with non-local conditions and unbounded delay
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Oscar Camacho --- Universidad San Francisco de Quito USFQ, Ecuador S. Lalvay-Segovia --- , Ecuador Hugo Leiva --- , Ecuador L. Riera-Segura --- , EcuadorIn this work, we study the approximate controllability for retarded neutral differential equations with unbounded delay, non-instantaneous impulses, and non-local conditions. First, we set the problem in a natural Banach phase space satisfying Hale-Kato axiomatic Theory about the phase space... -
The (E, E)-approximation property for Banach spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Ju Myung Kim --- Sejong University, Korea Bentuo Zheng --- The University of Memphis, USAFor a given Banach space E with an 1-unconditional basis, we introduce the (E, E)-approximation property ((E, E)-AP) which is a natural generalization of the classical approximation property (AP) and the (p, p)-AP. It is shown that the AP always... -
Quantifying the effect of chemical bush control of
Senegalia mellifera on vegetation production in the Eastern Kalahari Bushveld, South AfricaItem type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: --- , South Africa --- , South Africa --- North-West University, South AfricaBush encroachment is the invasion of whole landscapes by indigenous and alien woody species. An imbalance in the ratio of grasses to bushes is a consequence of bush encroachment due to competition for moisture, nutrients and sunlight. This imbalance results... -
Philoxenia — the DNA of hospitality: hype or cure?
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Peter A. Singleton --- NHL Stenden University of Applied Sciences, The NetherlandsPhiloxenia is the ancient Greek custom or tradition of treating a stranger as a friend, but it goes much deeper in terms of its reality and consequences. This custom sits deep in Greek culture and mythology, where its layers of... -
Generating functions in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Youssef Azouzi --- Tunis-El Manar University, Tunisia Youssef Nasri --- Tunis-El Manar University, TunisiaWe introduce and study the concept of generating function for natural elements in a Dedekind complete Riesz space equipped with a conditional expectation operator. This allows us to study discrete processes in a free-measure setting. In particular we improve a... -
On binary matrix properties
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Michael Hoefnagel --- Stellenbosch University, South Africa Pierre-Alain Jacqmin --- Université catholique de Louvain, Belgium Zurab Janelidze --- Stellenbosch University, South Africa Emil van der Walt --- Stellenbosch University, South AfricaThe so-called matrix properties of finitely complete categories are a special type of exactness properties that can be encoded as extended matrices of integers. The relation of entailment of matrix properties gives an interesting preorder on the set of such... -
A system of two elliptic equations with nonlinear convection and coupled reaction terms
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dragos-Patru Covei --- The Bucharest University of Economic Studies, RomaniaThe present paper is concerned with the existence of solutions for a class of elliptic systems involving nonlinearities of the Keller-Osserman type and combined with the convection terms. Firstly, we establish a result involving sub and super-solution for a class... -
Grass dynamics along a woody-plant density reduction gradient in a South African savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Piet Monegi --- Animal Production–Agricultural Research Council, South Africa Ntuthuko R. Mkhize --- Animal Production–Agricultural Research Council, South Africa Julius T. Tjelele --- Animal Production–Agricultural Research Council, South Africa David Ward --- Kent State University, United States Zivanai Tsvuura --- University of KwaZulu-Natal, South AfricaWoody plant encroachment threatens ecosystem services and functioning, thereby reducing herbaceous plant population persistence and community stability. We assessed the impact of woody removal intensity (WRI) on the grass ground cover, grass composition, diversity and richness, and rangeland condition in... -
Tricomi problem for mixed parabolic-hyperbolic equation with dynamic-type boundary condition
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Bauyrzhan Derbissaly --- Institute of Mathematics and Mathematical Modeling, KazakhstanIn this paper, we study an analogue of Tricomi problem for a parabolichyperbolic equation of the first type. To solve the problem for the heat equation, we use properties of the spectral problem with a spectral parameter in the boundary... -
Conditional indicators
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Dorsaf Cherif --- , Tunisia Emmanuel Lepinette --- Paris Dauphine University, FranceIn this paper, we introduce a large class of (so-called) conditional indicators, on a complete probability space with respect to a sub σ-algebra. A conditional indicator is a positive mapping, which is not necessary linear, but may share common features... -
Investor sentiments and performance of selected ESG indices in BRICS markets during bull and bear conditions
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Damilola Aboluwodi --- Finance, University of KwaZulu-Natal, South Africa Paul-Francois Muzindutsi --- Finance, University of KwaZulu-Natal, South Africa Bomi Nomlala --- Accounting, University of KwaZulu-Natal, South AfricaSustainability concerns are increasingly shaping global investment decisions, prioritising sustainable impacts over mere profit-making. This study examines the performance of Environmental, Social, and Governance (ESG) funds in emerging markets, focusing on bull and bear market scenarios. A Markov Regime Switching... -
Some characterizations of ergodicity in Riesz spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Youssef Azouzi --- Tunis-El Manar University, Tunisia Marwa Masmoudi --- Tunis-El Manar University, TunisiaIn the recent surge of papers on ergodic theory within Riesz spaces, this article contributes by introducing enhanced characterizations of ergodicity. Our work extends and strengthens prior results of both the authors and Homann, Kuo, and Watson. Specifically, we show... -
Sociodemographic, mental, and physical health determinants of incident depressive symptoms among ageing men and women in rural South Africa: A longitudinal study from 2015 to 2022
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Karl Peltzer --- University of the Free State, South AfricaWe aimed to assess the associations between sociodemographic, mental, and physical health factors and incident depressive symptoms (IDS) among ageing men and women in rural South Africa over time. Data from the 7-year South African longitudinal Health and Ageing in... -
Clinical characteristics of endocrine disturbances in post-COVID-19 condition, case report with review of literature
Item type: Journal Article • Journal: Journal of Endocrinology, Metabolism and Diabetes of South Africa • Authors: W. Ji --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China XM. Xie --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China L. Zhang --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China HY. Zhou --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China GR. Bai --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China L. Li --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China YT. He --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China J. He --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China CY. Xia --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China H. Li --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China RD. Li --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China R. Ping --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of China D. Qiang --- The Second Clinical Medical College of Ningxia Medical University, People's Republic of ChinaPost-COVID-19 condition (PCC) is frequently associated with multiple endocrine hormone disturbances, primarily involving the hypothalamic–pituitary–adrenal axis. However, the exact cause remains unclear, particularly concerning whether these symptoms result from hypothalamus damage. This study reports on the clinical characteristics and examination... -
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... -
A study of a Kirchhoff-type p(x)-triharmonic problem involving two parameters
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Xiumei Han --- Shandong University of Science and Technology, P.R. China Zohreh Naghizadeh --- University of Science and Technology of Mazandaran, Iran Binlin Zhang --- Shandong University of Science and Technology, P.R. ChinaOur most significant aim is to guarantee multiplicity results for a Kirchhoff-type problem involving two parameters and p(x)-triharmonic operator subject to the Navier boundary condition. More precisely, two critical point theorems are exploited to attain main theorems. -
Impact of workplace adversity on well-being of Ghanaian bankers: Do resilience and psychological safety matter?
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Justice Mensah --- University of Ghana Business School, Ghana Kwesi Amponsah-Tawiah --- University of Ghana Business School, Ghana Eric Nanteer-Oteng --- University of Ghana Business School, GhanaWe examined the role of resilience and psychological safety in the relationship between perceived workplace adversity and work well-being. Participants were 1257 Ghanaian banking sector employees (male = 49.32, female = 50.68%; age range = 21 to 60 years, mean... -
Assessment of the inland wetland ecosystem types in South Africa: threats and protection
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H van Deventer --- Council for Scientific and Industrial Research (CSIR), South Africa Jeanne L Nel --- , The NetherlandsEcosystem threat status (ETS) and ecosystem protection levels (EPLs) are headline indicators that can assess freshwater ecosystems at a country-wide scale. A spatial layer of freshwater, inland wetland ecosystem types of South Africa was combined with a range of spatial... -
Veld condition assessments are unrepresentative at the edges of rotational burn management blocks where grass community composition is atypical
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anne E Goodenough --- School of Education and Science, University of Gloucestershire, UK William S Carpenter --- School of Education and Science, University of Gloucestershire, UK Hannah Toms --- School of Education and Science, University of Gloucestershire, UK Benjamin A Bayliss --- School of Education and Science, University of Gloucestershire, UK Chloe J Cookes --- School of Education and Science, University of Gloucestershire, UK Lena Buerger --- School of Education and Science, University of Gloucestershire, UK Chloe L Cogdell --- School of Education and Science, University of Gloucestershire, UK Sara L Evans --- School of Education and Science, University of Gloucestershire, UK Tom Lancashire --- School of Education and Science, University of Gloucestershire, UK Fern D Kenyon-Hamp --- School of Education and Science, University of Gloucestershire, UK Ruari J MacGregor --- School of Education and Science, University of Gloucestershire, UK Sarah A Morshead --- School of Education and Science, University of Gloucestershire, UK Candace M Pattison --- School of Education and Science, University of Gloucestershire, UK Eli Shrubb --- School of Education and Science, University of Gloucestershire, UK Hannah D Upshall --- School of Education and Science, University of Gloucestershire, UK Charlene R Watts --- School of Education and Science, University of Gloucestershire, UK Lynne MacTavish --- Mankwe Wildlife Reserve, South Africa Melissa Dawson --- Mankwe Wildlife Reserve, South Africa Adam G Hart --- School of Education and Science, University of Gloucestershire, UKFenced reserves provide benefits for wildlife but are vulnerable to overgrazing. Accurate veld condition assessments are essential to inform stocking density, translocation/culling interventions and burn management decisions. Here, for the first time, we test whether atypical changes in the grass... -
A class of constant coefficient nonlinear equations that are solvable by the heat kernel
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Sameerah Jamal --- University of the Witwatersrand, South AfricaIn this paper, we document a new tractable method to solve nonlinear classes of partial differential equations subject to initial-values. The method involves a detailed transformation procedure, underpinned by the Lie pint symmetries of the one dimensional heat transfer equation... -
Spillovers, correlations and hedging among green bonds, clean energy stocks and fossil fuels: The effects of four turmoils
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Foday Joof --- Eastern Mediterranean University, Turkey Cahit Adaoglu --- Eastern Mediterranean University, Turkey Nigar Taspinar --- Eastern Mediterranean University, TurkeyThis study investigates the volatility spillovers and the hedging among green bonds, clean energy stocks, and fossil fuels markets. During the ten-year sample period between 2012 and 2022, four major turmoils are observed chronologically: The oil price plunge of 2014–2016,... -
On the stability of a system with one control and with non local boundary conditions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Farida Belhannache --- University of Jijel, Algeria Salim A. Messaoudi --- University of Sharjah, UAEIn this paper, we consider a system of two hyperbolic equations with Bessel operators and weighted integral conditions. We use a non traditional multiplier method to establish a decay result of solutions. -
Brain drain in African healthcare: A systematic review and policy implications
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Gregory N. Orewa --- University of Texas at San Antonio, USA Nero Edevbie --- Sam Houston State University, Ifeyimika O. Ajaiyeoba --- University of Wisconsin-Parkside, USA Sofia Smeigh --- University of Texas at San Antonio, USA Juliet O. Osuji --- North Carolina Agricultural and Technical State University, USAThe migration of highly educated and working professionals from Africa to more developed regions – commonly referred to as “brain drain” – is a significant issue that undermines the continent's socioeconomic progress. This paper provides a systematic literature review of... -
Intrapopulation isotopic niche structure in mammalian carnivores and herbivores across contrasting habitats
Item type: Journal Article • Journal: African Zoology • Authors: Chanel Lewis --- University of the Free State, South Africa Runè van der Merwe --- University of the Free State, South Africa Chabi AMS Djagoun --- University of Abomey-Calavi, Benin Etotépé A Sogbohossou --- University of Abomey-Calavi, Benin Daryl Codron --- University of the Free State, South AfricaNatural communities exhibit ecological gradients that result in a variety of competitive interactions and variations in niche patterns. Changes in resource availability affect the size of a species’ niche: it expands when a variety of resources are abundant and contracts... -
The behavioural response of an estuarine teleost (Cape stumpnose Rhabdosargus holubi) to angler bait collection in two adjacent Eastern Cape estuaries, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EC Butler --- Rhodes University, South Africa B van Heerden --- Rhodes University, South Africa MW Farthing --- Rhodes University, South Africa A-R Childs --- Rhodes University, South Africa WM Potts --- Rhodes University, South AfricaReports of learned behavioural adaptations of wild Cape stumpnose Rhabdosargus holubi (family Sparidae) were investigated in two estuarine systems in the Eastern Cape Province, South Africa. Underwater observational trials using video cameras demonstrated that fish rapidly responded to bait collection... -
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... -
Simulated rangeland conditions and seasonal variations influence soil quality in semi-arid central South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JDJ Marx --- University of the Free State, South Africa E Kotzé --- University of the Free State, South Africa JJ van Tol --- University of the Free State, South Africa PF Loke --- University of the Free State, South AfricaThe study examined long-term effects of rangeland conditions and seasonal variations on soil quality without confounding grazing effects. Samples were collected seasonally from good, moderate, poor, bare and cultivated rangeland conditions at soil depths of 0–10 cm and analysed for... -
Approximation and Compactness
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: E. Colebunders --- Vrije Universiteit Brussel, België R. Lowen --- Universiteit Antwerpen, BelgiëIn approach theory convergence is described by means of limit and adherence operators acting on filters or ultrafilters. The value of the limit resp. adherence operator on an (ultra)filter in a point x is interpreted as the distance that the... -
Grazing smarter: science-based grazing strategies, not only stocking rate, determine rangeland outcomes
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Richard Fynn --- Okavango Research Institute, University of Botswana, Botswana Kevin Kirkman --- School of Agriculture and Science, University of KwaZulu-Natal, South Africa Craig Morris --- School of Agriculture and Science, University of KwaZulu-Natal, South Africa Peter Zacharias --- Consultant in Vegetation/Animal Systems, South AfricaResearch indicates a ‘crisis’ in the search for optimal grazing strategies with experimental results suggesting that stocking rate is the primary factor influencing rangeland condition and cattle performance. However, we contend that this is a spurious conclusion, inevitably conceived by... -
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... -
Effect of entrepreneurial orientation on sustainable financial practices: The roles of dynamic capabilities and institutional conditions
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Divine Atinyo --- University of Cape Coast, Ghana George Tweneboah --- University of Cape Coast, GhanaEntrepreneurial orientation (EO) is increasingly recognized as a vital strategic factor, particularly in volatile business environments. While EO can potentially drive superior sustainable financial practices (SFP), there remains a gap in understanding the underlying mechanisms and contextual factors that complement... -
Body condition metrics and reproductive aspects of three spiny eels (Teleostei: Mastacembelidae) from littoral habitats in southern Lake Tanganyika
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mabo --- Department of Agriculture and Aquatic Sciences, Kapasa Makasa University, Zambia APH Bose --- Department of Wildlife, Fish & Environmental Studies, Swedish University of Agricultural Sciences, Sweden B Mutale --- Department of Agriculture and Aquatic Sciences, Kapasa Makasa University, Zambia LH Haambiya --- Nsumbu Tanganyika Conservation Programme, Frankfurt Zoological Society, Zambia K Kunda --- Lake Tanganyika Research Unit, Department of Fisheries, ZambiaThe body condition metrics and reproductive aspects of three spiny eel species (Mastacembelus moorii, M. ellipsifer and M. cunningtoni) inhabiting littoral habitats in southern Lake Tanganyika were evaluated. As Mastacembelids are important in artisanal fisheries, the study aimed to provide... -
Some scattering and spectral properties of eigenparameter dependent quantum difference equations with matrix value impulsive conditions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Güher Gülçehre Özbey --- Middle East Technical University, Üniversiteler Mahallesi, Turkey Yelda Aygar --- Ankara University, TurkeyIn this study, we present a problem which consists quantum difference equation with matrix value impulsive conditions and eigenparameter dependent boundary condition. Our examination is based on the concept of main spectral and scattering properties of this problem. We introduce...
