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A study of variations in floristic composition of highveld in the eastern Transvaal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: D.L. Barnes --- Department of Agriculture (Transvaal Region), B.H. Beukes --- Department of Agriculture (Transvaal Region), G.D. Kotzé --- Department of Agriculture (Transvaal Region),Floristic surveys of two 1500m line transects in veld provided data which indicated the nature of variations in veld composition, expressed in terms of species, palatability classes or weighted palatability classes. The transects were subjectively subdivided into units comprising relatively... -
Fire behaviour in the Kruger National Park
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: W.S.W. Trollope --- Sub‐department Pasture Science Faculty of Agriculture, Ciskei A.L.F. Potgieter --- Division Nature Conservation,Fire research in the Kruger National Park has largely been focussed on the effect of the season and frequency of burning on the vegetation. Very little information is available on the effect of fire behaviour and in particular fire intensity,... -
Characteristics of fire behaviour in the montane grasslands of natal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: TheresaM. Everson --- Department of Environment Affairs, Directorate of Forestry, F.R. Smith --- Department of Environment Affairs, Directorate of Forestry, C.S. Everson --- Department of Environment Affairs, Directorate of Forestry,Fire behaviour characteristics were investigated in the montane grasslands of the Natal Drakensberg. The behaviour of experimental fires was measured together with the accompanying biotic and abiotic conditions. Estimates of heat yield, mass of available fuel and forward rate of... -
Recent trends in grazing management philosophy in South Africa
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: N.M. Tainton --- Department of Grassland Science,Reasoned argument by researchers in veld management in South Africa and elsewhere has not generally supported a number of contentious recommendations made in recent years in the popular and semi‐popular press. The only major changes to general management thinking has... -
Produksie en kwaliteit van ‘n aantal grasspesies in die Combretum‐veld van noord‐transvaal
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P.A. Pieterse --- Departement Plantproduksie, Fakulteit Landbouwetenskappe, J.O. Grunow --- Departement Plantproduksie, Fakulteit Landbouwetenskappe,Die produksie en kwaliteit van vyf spesies (Themeda triandra, Heteropogon contortus, Digitaria eriantha var. pentzii, Schmidtia pappophoroides en Eragrostis rigidior) is by verskillende frekwensies van ontblaring op ontbosde en onontbosde bosveld gemeet. In die daaropvolgende jaar is intensiteit bygebring met... -
Die invloed van die beskikbaarheid van nutriënte en ontblaringsbestuur op die produksie van digitar1a Eriantha variëteit Eriantha
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: P A Pieterse --- Departement Plantproduksie,Die invloed van verskillende peile van stikstof (N), fosfaat (P) en kalium (K) op die produksie en kwaliteit van Digitaria eriantha var. eriantha is in sandkultuur ondersoek. Verder is daar ook gekyk na die invloed van drie intensiteite van ontblaring... -
Determining sample size for assessing species composition in grassland1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.B. Hardy --- Department of Agricultural Development, Republic of South Africa R.S. Walker --- Department of Grassland Science, Republic of South AfricaSpecies composition is measured in grasslands for a variety of reasons. Commonly, observations are made using the wheel‐point apparatus. However, the problem of determining optimum sample size has not yet been satisfactorily resolved. In this study the wheel‐point apparatus was... -
Influence of rainfall and grazing on the compositional change of the herbaceous layer of a sandveld savanna
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: T.G. O'Connor --- Resource Ecology Group, Department of Botany,The influence of heavy grazing by cattle for three years, and of rainfall interception for one year, on the herbaceous composition of a sandveld savanna in Gazankulu was investigated. The composition and the abundance of the predominant species changed substantially,... -
Die invloed van straling op die groei van mielies (Zea mays L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.M. Hurn --- Departement Plantproduksie, Republiekvan Suid-Afrika P.S. Hammes --- Departement Plantproduksie, Republiekvan Suid-AfrikaAangesien stralingsintensiteit met plek en tyd varieer, is die invloed daarvan op groei en ontwikkeling van mielies in 'n veldproef ondersoek. Drie stralingsintensiteite (100%, 75% en 42% van voile sonlig) en drie plantpopulasies (1.2, 2.7 en 5.5 plante m−2) is... -
Physiological response of groundnut (Arachis hypogaea L.) to thinning time and intensity after anthesis
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. J.P. Tarimo --- Department of Crop Science and Production, Tanzania F. P.C. Blarney --- , AustraliaTwo experiments were carried out to study groundnut (Arachis hypogaea L.) response to thinning time and intensity after anthesis at Redland Bay Farm, Southeast Queensland, Australia, during 1987/88 (Experiment 1) and 1989/90 (Experiment 2). Six cultivars were included in Experiment... -
Optimising the extraction of natural flavouring from ‘Satsum’ mandarin (Citrus unshiu Marc.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.S. Duvenage --- Department of Hospitality and Tourism, South Africa D. van Lill --- , South Africa C. Walsh --- , South AfricaApproximately 18% of ‘Satsuma’ mandarins produced in the Eastern and Western Cape of South Africa are discarded because of strict export standards. The demand for natural flavourants presented an opportunity to extract a unique flavourant from ‘Satsuma’ mandarin rind for... -
Tillage-crop residue management and rainfall-runoff relationships for the Alemaya catchment in Eastern Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Y.E. Woyessa --- Department of Soil, Crop and Climate Sciences, South Africa A. T.P. Bennie --- Department of Soil, Crop and Climate Sciences, South AfricaA field study was conducted in the Alemaya catchment, Eastern Ethiopia, with the objective of determining the effect of tillage practices, crop reside cover and rainfall characteristics on runoff during two rainfall seasons on a clayey Regosol with 5% slope... -
Impacts of non-selective grazing on cover, composition, and productivity of Nama-karoo grassy shrubland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: P.C. Beukes R.M. CowlingThe non-selective rotational grazing system has undergone a long and controversial development. The merits of this grazing system, where relatively large numbers of livestock are herded into numerous small paddocks for short timespans with long rests between grazings, have not... -
The effect of different fire treatments on the population structure and density of the Marula, Sclerocarya birrea (A. Rich.) subsp. caffra (Sond.) kokwaro (Kokwaro & Gillet 1980) in the Kruger National Park
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: OS Jacobs R BiggsTo determine the influence of frequency and season of burn on the growth structure and density of Sclerocarya birrea, six replicated fire treatments of the experimental burning plot trial were surveyed in the Sclerocarya birrea / Acacia nigrescens savanna of... -
Is carry-over of grass biomass between years important in determining savanna fire regimes?
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JJ Midgley D Balfour N GovenderWe show that the size of areas burned in three southern African parks is dominated by the amount of rainfall in the immediately preceding summer. Considering mean rainfall from two years previous changes r2 values by <20%. We interpret this... -
The influence of urine and dung deposition on patch grazing patterns of cattle and sheep in the Southern Tall Grassveld
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: B.U. Lütge --- Department of Grassland Science, Republic of South Africa G.P. Hatch --- Department of Grassland Science, Republic of South Africa M.B. Hardy --- KwaZulu‐Natal Department of Agriculture, Republic of South AfricaThe effect of urine and dung deposition on the patch grazing patterns of cattle and sheep in the Southern Tall Grassveld was investigated using an experiment with four treatments, viz. artificial urine, fresh cattle dung, fresh sheep dung, and a... -
Prescribed under-canopy burning in Pinus patula plantations of the Mpumalanga highveld: The effects of fire on tree growth
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: TheresaL. Bird MaryC. ScholesThe effect of controlled undercanopy burning on tree growth has been studied under 16-year-old Pinus patula trees in Mpumalanga. Three fire intensity treatments and a control "no-burn" treatment, were applied to 1 ha plots. Average fuel depth was 42cm with... -
Program for the deterministic modelling of genetic gains of tree breeding and seed and clone production strategies
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.D. Vernyn --- , South Africa C.L. Snedden --- , South Africa R.C. Parfitt --- , South AfricaA deterministic modelling algorithm was developed for the prediction of genetic gains of six breeding and 11 (seed and clone) production strategies. This algorithm can run iteratively over ranges of parameters which affect the genetic gains. These parameters are the... -
The occurrence of the tapeworm Ligula intestinalis (L.), in Barbus paludinosus from a small dam in Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Barson BE MarshallCestode parasites were collected from Barbus paludinosus from Munwahuku Dam near Harare, Zimbabwe over a period of 13 months. Plerocercoids of Ligula intestinalis were found in 7.2% of the fish. The majority of the infected fish carried one parasite, with... -
Towards the development of a macroinvertebrate sampling technique for palustrine wetlands in South Africa: a pilot investigation in the KwaZuluNatal midlands
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Rebecca Bowd DonovanC Kotze CraigD Morris NevilW QuinnA study was undertaken in November 2003 to derive a suitable sampling technique for collecting a representative sample of aquatic macroinvertebrates from a selected emergent vegetation biotope in a palustrine wetland, Melmoth Vlei, KwaZulu-Natal, South Africa. The aim was to... -
Influence of human disturbance on patterns of leaf herbivory at Gazi Bay mangrove forest, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: CM Kihia --- Department of Biological Science, Kenya JM Mathooko --- Department of Biological Science, Kenya RK Ruwa --- , Kenya WA Shivoga --- Department of Environmental Science, KenyaMangrove herbivores cause leaf serration, perforation and galls prior to leaf abscission. This study compared damage by herbivores on leaves of four mangrove species at sites under different levels of human physical disturbance, and provides further evidence of the indirect... -
Influence of sample size and sampling frequency on the quantitative dietary descriptions of a predatory fish in the Benguela ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N. McQueen M. H. GriffithsSpatial and temporal variation in the diet and feeding intensity of snoek, Thyrsites atun, a top predator of the southern Benguela, was investigated to provide information on data requirements for accuracy of annual diets as inputs to ecosystem models. Appropriate... -
Science and Technology Activities in the Emerging Economies: Options for Nigeria1
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Oluseye O. Jegede --- National Centre for Technology Management, Nigeria Blessing F. Ojo --- National Centre for Technology Management, NigeriaThis study identifies how two emerging economies developed science and technology capabilities through science and technology (S&T) education/training, research and experimental development. This was done in order to recommend policy options for Nigeria for the development of its industrial sector... -
Post fire indicators of fire intensity at indigenous forest margins in the southern Cape, South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: A. G. Schmidt --- Department of Nature Conservation, M. Vlok --- Department of Nature Conservation,The aim of this study was to identify post fire indicators of fire intensity at indigenous forest margins in the southern Cape. Three sites in the southern Cape were subjectively chosen in recently burnt areas to represent areas of varying... -
Habitual physical activity levels are positively correlated with CD4 counts in an HIV-positive South African population
Item type: Journal Article • Journal: African Journal of AIDS Research • Authors: Kirsten Kinsey Joanne McVeigh Ingrid ChantlerIn order to assess the relationship between CD4 cell count, habitual physical activity levels and functional independence in a South African adult population positive for HIV, we administered a questionnaire concerning lifestyle and physical activity. Data collection took place at... -
Settlement pattern and survival of a shell-infesting sabellid polychaete, Terebrasabella heterouncinata, on South African abalone, Haliotis midae, fed two diets
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MichaelS Gray Horst KaiserThis study tested whether abalone diet influences larval settlement success of the shell-dwelling sabellid polychaete Terebrasabella heterouncinata and their survival over the first 96h after settlement on host abalone. Shell area preferences of the sabellid were also investigated. Abalone diet... -
Regional vegetation management standards for commercial pine plantations in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: CA Rolando --- , New Zealand KM Little --- , South AfricaDuring the 1990s a number of trials were implemented in the summer rainfall region of South Africa to determine both the short- and long-term impacts of competing vegetation on pine growth. Trial sites were selected across different physiographic regions such... -
Regional vegetation management standards for commercial Eucalyptus plantations in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: KM Little CA RolandoDuring the 1990s a number of trials were implemented in the summer-rainfall region of South Africa to determine both the short- and long-term impacts of competing vegetation on eucalypt growth. Trial sites were selected across different physiographic regions such that... -
Prevalence of chronic pain in patients attending primary healthcare facilities in south-west Tshwane
Item type: Journal Article • Journal: South African Family Practice • Authors: WN Rauf --- Department of Family Medicine, HP Meyer --- Department of Family Medicine, TS Marcus --- Department of Family Medicine, PJ Becker --- Biostatistics Unit,Objectives: Despite the significant biopsychosocial impact of chronic pain on the health and quality of life of an individual, as well as on healthcare utilisation, no published data are available on the prevalence of chronic pain in the South African... -
Reports of Kroyeria species collected from South African waters with notes on the host–parasite associations
Item type: Journal Article • Journal: African Zoology • Authors: Peter J Mokumo --- Department of Biodiversity, University of Limpopo, South Africa Susan M Dippenaar --- Department of Biodiversity, University of Limpopo, South AfricaThere are 21 species in the genus Kroyeria of which nine have been reported from hosts caught off South Africa. Host–parasite associations were reported for K. dispar, K. papillipes and K. sphyrnae. Kroyeria specimens were collected from the gill filaments... -
Distribution of Contracaecum (Nematoda: Anisakidae) larvae in freshwater fish from the northern regions of South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Sareh Tavakol --- Department of Biodiversity, University of Limpopo, South Africa Willem J Smit --- Department of Biodiversity, University of Limpopo, South Africa Joseph R Sara --- Department of Biodiversity, University of Limpopo, South Africa Ali Halajian --- Department of Biodiversity, University of Limpopo, South Africa Wilmien J Luus-Powell --- Department of Biodiversity, University of Limpopo, South AfricaA total of 1 847 fishes (16 species) from 14 reservoirs in northern and north-eastern regions of South Africa were collected and examined for larval Contracaecum spp. between 2005 and 2013. This study, the first to examine several potential second... -
Pelagic eggs of marine fishes from Park Rynie, KwaZulu-Natal, South Africa: seasonal spawning patterns of the three most common species
Item type: Journal Article • Journal: African Zoology • Authors: A.D. Connell --- Environmentek, South AfricaFor the period 1987 to 1998, pelagic eggs of marine fishes were collected from shelf waters at Park Rynie on the KwaZulu-Natal south coast. The three most numerous eggs collected were those of the mackerel Scomber japonicus,the sardine Sardinops sagax... -
Investigation of a parasitic outbreak of Lernaea cyprinacea Linnaeus (Crustacea: Copepoda) in fish from Zimbabwe
Item type: Journal Article • Journal: African Zoology • Authors: Maxwel Barson [AN0001] Atridah Mulonga --- Department of Biological Sciences, Laboratory of Aquatic Ecology and Evolutionary Biology, Zimbabwe, Belgium Tamuka Nhiwatiwa --- Department of Biological Sciences, Laboratory of Aquatic Ecology and Evolutionary Biology, Zimbabwe, BelgiumInfestation of fish by the crustacean ectoparasite Lernaea cyprinacea Linnaeus, 1758 was investigated to establish the extent of infestation, potential effects of the parasite and its ecological adaptations. Fish samples were collected from impoundments in the Malilangwe Wildlife Reserve in... -
Siphonostomatoid copepods infecting Squalus acutipinnis Regan, 1908 off South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SM Dippenaar --- Department of Biodiversity, South Africa RA Molele --- Department of Biodiversity, South AfricaSqualus acutipinnis (previously included in S. megalops) individuals caught off the east, south and west coasts of South Africa were examined for siphonostomatoid copepod infection. Collected siphonostomatoids were fixed and preserved in 70% ethanol and studied under microscopes using both... -
Environmental factors influencing the distribution and prevalence of Schistosoma haematobium in school attenders of ILembe and uThungulu Health Districts, KwaZulu-Natal Province, South Africa
Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases • Authors: Nkosinathi Banhela --- Discipline of Public Health Medicine, South Africa Myra Taylor --- Discipline of Public Health Medicine, South Africa Siphosenkosi Gift Zulu --- Discipline of Public Health Medicine, South Africa Linnea Sund Strabo --- Norwegian Centre for Imported and Tropical Diseases, Department of Infectious Diseases Ullevaal, Norway Eyrun Floerecke Kjetland --- Discipline of Public Health Medicine, South Africa Svein Gunnar Gundersen --- Research Department, NorwaySchistosoma haematobium infection is reported to facilitate the development of urogenital diseases. Its symptoms include haematuria, dysuria and tiredness, and it may cause cognitive decline in children. The prevalence of S. haematobium infection needs to be known in endemic areas... -
Adult binge drinking: rate, frequency and intensity in Buffalo City Metropolitan Municipality, South Africa
Item type: Journal Article • Journal: South African Family Practice • Authors: Eyitayo Omolara Owolabi --- Department of Nursing Science, South Africa Daniel Ter Goon --- Department of Nursing Science, South Africa Oladele Vincent Adeniyi --- Department of Family Medicine, South Africa Eunice Seekoe --- Department of Nursing Science, South AfricaBackground: Binge drinking (BD) is a significant risk factor for several acute and chronic illnesses, including injuries. This study examines the rate, frequency and intensity of BD in Buffalo City Metropolitan Municipality (BCMM), South Africa. -
Vegetation gradients around cattleposts in the eastern mountains of Lesotho
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig Morris --- Agricultural Research Council–Animal Production Institute, c/o School of Life Sciences, South AfricaThe grasslands of the mountains in eastern Lesotho support large numbers of sheep, angora goats and other livestock during the summer, during which they are corralled nightly by herders at cattleposts. Few studies, however, have quantified the impact of grazing... -
Macroparasites of angelfish Brama brama (Bonnaterre, 1788) in the southern Benguela Current ecosystem
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AL Mackintosh --- Department of Biological Sciences, South Africa CC Reed --- Department of Biological Sciences, South Africa MAI Nunkoo --- Department of Biological Sciences, South Africa PH King --- Department of Biology, South Africa CD van der Lingen --- Department of Biological Sciences, South AfricaThe angelfish Brama brama is a mesopelagic species distributed circumglobally in temperate to warm-temperate waters, including continental-shelf-edge and upper-slope waters of the Benguela Current ecosystem. Little is known about the parasite assemblage of Benguela B. brama, with only three parasite... -
Timing information, SEC enforcement intensity and illegal insider trading
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Han-Ching Huang --- Department of Finance, TaiwanThis paper explores the difference between illegal insider trading around scheduled and unscheduled corporate announcements. Moreover, this paper also examines whether the underlying option has impacted on trading patterns of illegal insider trading around corporate announcements. I find that the... -
Where have foreign banks in Nigeria gone? Market structure, competitive intensity and the capabilities of Nigeria banks
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Lilac Nachum --- International Business Department, USA Chris Ogbechie --- Strategic Management Department, NigeriaPrivately-owned Nigerian banks hold 94% of Nigeria banking assets, the world's second largest share of local ownership. Theoretical explanations for the dominance of local firms related to liabilities of foreignness do not explain this phenomenon, as foreign banks do not... -
Estimating effects of information and communication technology (ICT) on the productivity of manufacturing industries in South Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Mapula Hildah Lefophane --- , South Africa Mmatlou Kalaba --- , South AfricaThis paper serves to examine whether the growth in labour productivity (LP) in South Africa’s manufacturing sector, following policy reforms after 1994, can be attributed to ICT use. To achieve this, we examine the link between ICT intensity and LP... -
Reliability and quality of artificial nectar feeders for birds in the Cape Floristic Region
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Anina Coetzee --- , South Africa Phoebe Barnard --- , South Africa Anton Pauw --- , South AfricaSupplementary feeding of birds may have considerable ecological and evolutionary effects on bird communities. However, there is a lack of basic information on the prevalence, frequency and quality of supplementary feeders, especially in African urban areas. Here we describe the... -
The effect of adjacent vegetation on fire severity in Afrotemperate forest along the southern Cape coast of South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Brandon Giddey --- , South Africa Johan A Baard --- , South Africa Lufuno Vhengani --- , South Africa Tineke Kraaij --- , South AfricaRecently two large wildfires (around the towns of Knysna in 2017 and George in 2018) jointly burnt over 80 000 ha in the southern Cape, South Africa. Here, patches of closed-canopy Afrotemperate forest occur within a matrix of fire-prone (native)... -
A balanced perspective on the contribution of extensive ruminant production to greenhouse gas emissions in southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Michiel M Scholtz --- , South Africa Frans J Jordaan --- , South Africa N Thuli Chabalala --- , South Africa Georgette M Pyoos --- , South Africa M Joel Mamabolo --- , South Africa Frederick WC Neser --- University of the Free State, South AfricaThere is a general perception that ruminants produce large quantities of greenhouse gases (GHG) which contribute to global warming. Ruminant production is also known as the world’s largest user of land, and southern Africa is no exception. Recent estimates indicate... -
Changes in plant vegetation structure and diversity with distance from herder shelters in the Middle Atlas Mountains
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A El Aich --- Institut Agronomique et Vétérinaire Hassan II, Morocco S Ghassan --- Institut Agronomique et Vétérinaire Hassan II, Morocco CL Alados --- Instituto Pirenaico de Ecología (CSIC), Spain S El Aayadi --- Institut Agronomique et Vétérinaire Hassan II, Morocco L Baamal --- Institut Agronomique et Vétérinaire Hassan II, MoroccoLivestock grazing intensity gradients associated with sheep holder shelters influenced the longevity of rangelands vegetation. This study aimed to examine the effects of livestock grazing pressure on vegetation structure and diversity with distance from herder shelters. Six shelters were sampled... -
Mapping fine-scale demersal trawl effort for application in ecosystem assessment and spatial planning
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JC Currie --- South African National Biodiversity Institute (SANBI), South Africa LR Harris --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa LJ Atkinson --- South African Environmental Observation Network (SAEON), South Africa TP Fairweather --- Fisheries and the Environment (DFFE), South Africa KJ Sink --- South African National Biodiversity Institute (SANBI), South AfricaFine-scale maps of fishing activity are valuable information layers for fisheries management, assessments of biodiversity impacts and marine spatial planning. Our aim was to develop an accurate map of demersal trawling intensity in South Africa and to demonstrate its utility... -
Effects of thinning on growth performance of teak (Tectona grandis) plantations in Tain II Forest Reserve, Ghana
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Bertrand Festus Nero --- Kwame Nkrumah University of Science and Technology, Ghana Maxwell Asuenabisa --- Kwame Nkrumah University of Science and Technology, GhanaAlthough recent interest in commercial teak plantation establishment has soared, knowledge of intensive silvicultural management of residual stands is limited in most parts of West Africa. This study evaluated the effects of thinning regimes on the growth responses and pruning... -
An analysis of the micro- and macro-economic determinants of firm R&D intensity in the South African business sector
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Amy Kahn --- Human Sciences Research Council (HSRC), South Africa Atoko Kasongo --- Human Sciences Research Council (HSRC), South Africa Moses M. Sithole --- Human Sciences Research Council (HSRC), South Africa Kgabo Hector Ramoroka --- Human Sciences Research Council (HSRC), South AfricaResearch and experimental development (R&D) is an important driver of economic growth and productivity. Gross expenditure on domestic R&D (GERD) is a country’s total expenditure on R&D performed by all sectors of the economy. South Africa’s GERD as a percentage... -
The highest-lowest price range and the cross-sectional returns predictability
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Xiaojun Chu --- , China Shuang Song --- , ChinaMotivated by literature on heterogeneous investors, we use the difference between the highest and lowest prices to proxy the intensity of competition among bullish-bearish investors and investigate its significance in the cross-sectional pricing of stocks. Portfolio-level analyses and cross-sectional regressions... -
Spatio-temporal dynamics of anthropogenic land-use pressures on temporarily closed estuaries in South Africa: a four-decade remote sensing analysis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: B McKelvey --- Oceanographic Research Institute, South African Association for Marine Biological Research, South Africa CF MacKay --- Oceanographic Research Institute, South African Association for Marine Biological Research, South AfricaLand-cover change is the leading cause of habitat loss globally. The extent of estuarine habitat loss and land-use pressures are understudied in South Africa, particularly in the numerically dominant temporarily closed estuaries. Remote sensing techniques are effective tools for monitoring... -
Trophic interactions of two sympatric small pelagic fishes off the southern coast of Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: DPA Quiatuhanga --- University of Namibe, Angola P Morais --- , United States MA Teodósio --- Universidade do Algarve, PortugalNumerous small pelagic fish species are of great economic importance and link the lower and upper levels of the marine food web. The round sardinella Sardinella aurita and flat sardinella S. maderensis coexist along their distribution range in the southeastern... -
Determinants of adoption and intensity of mechanization in Ethiopia: Evidence from Arsi Zone
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gizachew Mengesha Abebe --- Bahir Dar University, Ethiopia Wondaferahu Mulugeta Demissie --- Ethiopian Civil Service University (ECSU), Ethiopia Markose Chekol Zewdie --- Bahir Dar University, EthiopiaMechanization has been recognized as a key thematic area by the Ethiopian Agricultural Research Institute for the period 2018–2030; however, research on its adoption determinants remains limited. This study examines the factors influencing the adoption and intensity of mechanization, focusing... -
Impact of financial support on the intensity of innovation practices within SMEs – Case of Morocco
Item type: Journal Article • Journal: Africa Journal of Management • Authors: Abdelghani Koura --- University Sultan Moulay Slimane, Morocco Mohamed Oudgou --- University Sultan Moulay Slimane, Morocco Abdeslam Boudhar --- University Sultan Moulay Slimane, MoroccoInnovation is at the heart of economic growth and societal progress. It’s a driving force that keeps businesses competitive and economies thriving. However, Moroccan SMEs often struggle with financial barriers that limit their innovative capabilities. Despite government initiatives offering subsidies...