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An hypothesis concerning the development of the red leaf disorder in cotton (Gossypium hirsutum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N. J.J. Combrink --- , Republic of South AfricaThe development of the physiological disorder of cotton known as ‘rooidood’, ‘red leaf disorder’ or ‘potassium deficiency syndrome’ has not yet been explained. Several stress conditions have been associated with this disorder, including low N levels in leaves, low K... -
A comparison of head infection and blight development caused by Fusarium graminearum and Fusarium crookwellense in wheat
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. H.P. Boshoff --- Department of Plant Pathology, Republic of South Africa Z.A. Pretorius --- Department of Plant Pathology, Republic of South Africa W.J. Swart --- Department of Plant Pathology, Republic of South AfricaThe objectives of this study were to compare the infection of wheat heads by Fusarium graminearum and F. crookwellense and to determine the effect of temperature on head blight development induced by these species. Scanning electron microscopy of spikes of... -
Reaction of South African spring wheat cultivars to head blight caused by Fusarium graminearum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K. Ntushelo --- , South Africa W. H. P. Boshoff --- , South AfricaHead blight caused by Fusarium graminearum (Schwabe) is an important wheat (Triticum aestivum L.) disease in the centrepivot irrigation areas of South Africa. Fifteen cultivars, Gamtoos, Inia, Kariega, Marico, Nantes, Palmiet, SST 38, SST 55, SST 57, SST 65, SST... -
Effect of soil nutrient status on severity of seedling diseases and root rot of sorghum (Sorghum bicolor)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: N.W. McLaren --- , Republic of South AfricaThe hybrid NK283 was subjected to a range of nutrient element concentrations to determine their effect on predisposition of sorghum to seedling diseases and root rot. Emergence was not affected by soil nutrient status. Similarly N, P and K did... -
Field evaluation of maize inbred lines for resistance to Exserohilum turcicum
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M. Craven --- , South Africa A.P. Fourie --- , South AfricaNine maize inbred lines with excellent grey leaf spot resistance and good combining ability were evaluated for their reaction to infection by Exserohilum turcicum. The lines were compared to a differential set consisting of Oh43 and B73 (susceptible controls) and... -
Field evaluation of Ugandan sweetpotato germplasm for yield, dry matter and disease resistance
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: B. Yada --- , Uganda P. Tukamuhabwa --- Department of Crop Science, Uganda A. Alajo --- , Uganda R.O.M. Mwanga --- , UgandaA total of 946 morphologically distinct accessions of sweet-potato (Ipomoea batatas [L.] Lam) germplasm collected from Uganda were evaluated along with four released cultivars for root yield, dry matter, sweetpotato virus disease (SPVD) and Alternaria bataticola blight disease resistance for... -
THE LIMNOLOGY OF SOME SOUTH AFRICAN IMPOUNDMENTS I. THE PHYSICO-CHEMICAL LIMNOLOGY OF HARTBEESPOORT DAM
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: W.E. Scott --- , South Africa M.T. Seaman --- , South Africa A.D. Connell --- , South Africa S.I. Kohlmeyer --- , South Africa D.F. Toerien --- , South AfricaHartbeespoort Dam is a eutrophic, warm monomictic lake with overturn occurring in April. The lake is stratified for about six months of the year and in late summer the stratification appears stable. Light penetration in the dam depends both on... -
CHEMICAL CHANGES IN THE GROWTH MEDIUM OF MICROCYSTIS, BATCH CULTURES GROWN AT STRESS AND NON-STRESS LIGHT INTENSITIES
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: G H J Krüger --- Botany Department, South Africa JN Eloff --- Botany Department, South AfricaThe modified BG 11 growth medium used in this study has a poor buffer ability and large pH changes occurred during growth of Microcystis. Inhibition of growth in cultures grown at stress light intensity (26 μEinst m−2 sec−1) could be... -
OBSERVATTVNS ON THE UNDERWATER LIGHT FIELD OF TWO HWERTROPHIC, SOUTH AFRICAN IMPOUNDMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Robarts --- , South Africa T. Zohary --- , South Africa F. Ojeda --- , Chile C. C.E. Lovengreen --- , Chile R.D. Walmsley --- ,The spectral composition of the underwater light field was examined in two hypertrophic South African Impoundments (Hartbeespoort and Roodeplaat Dams) under a range of inorganic turbidities and chlorophyll α concentrations. The data indicated that inorganic turbidity and gilvin were dominant... -
OBSERVATIONS ON THE UNDERWATER LIGHT FIELD OF TWO HYPERTROPHIC SOUTH AFRICAN IMPOUNDMENTS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Robarts --- National Institute for Water Research, South Africa T. Zohary --- National Institute for Water Research, South Africa F. Ojeda --- Institute of Physics, Chile C. C.E. Lovengreen --- Institute of Physics, Chile R.D. Walmsley --- Foundation for Research and Development,The spectral composition of the underwater light field was examined in two hypertrophic South African impoundments (Hartbeespoort and Roodeplaat Dams) under a range of inorganic turbidities and chlorophyll a concentrations. The data indicated that inorganic turbidity and gilvin were dominant... -
Effects of selective defoliation and height of defoliation on tiller dynamics and herbage yield of Themeda triandra in a semi-arid rangeland in Zimbabwe
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: S. Dube V.E.E. GwarazimbaUnderstanding the impacts of intensity and selection of grazing on the performance of grasses is important in the management of grazing areas. It is especially important in semi-arid environments where, apart from moisture, the levels at which grasses are utilized... -
On the Consistency of a Separator
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: J.P. Harper --- Department of Mathematics, South Africa C.H. Rohwer --- Department of Mathematics, South AfricaA smoother can be called a separator if it is idempotent and co-idempotent, with the motivation coming from a physical analogy. This is a rudementary consistency, and type of “linearity”, which has been found to occur in practice. All the... -
Dynamics of a cyanobacterial bloom in a hypereutrophic reservoir, Lake Chivero, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: L Mhlanga --- Department of Biological Sciences, Zimbabwe W Mhlanga --- Department of Environmental Science, ZimbabweBlooming and non-blooming periods between 2004 and 2006 in a hypereutrophic reservoir, where cyanobacterial blooms have previously been reported to be permanent, presented an opportunity to characterise factors that may favour cyanobacterial dominance. As a bloom developed in May 2004,... -
Phytoplankton community and physico-chemical seasonality and changes in Lake Hora-Kilole, Ethiopia, a tropical crater lake
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: R Abate --- Fisheries and Aquatic Sciences Stream, Department of Zoological Sciences, Ethiopia D Kifle --- Fisheries and Aquatic Sciences Stream, Department of Zoological Sciences, Ethiopia B Lemma --- Fisheries and Aquatic Sciences Stream, Department of Zoological Sciences, Ethiopia YH Gao --- School of Life Sciences, ChinaPhytoplankton community structure and physico-chemical variables, sampled monthly at an offshore station in Lake Hora-Kilole from August 2007 to May 2008, were compared with previously reported data. In 1989 the Mojo River was temporarily diverted to flow into the lake... -
Effects of light intensity on cylindrospermopsin production in the cyanobacterial HAB species Cylindrospermopsis raciborskii
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Dyble PA Tester RW LitakerThe role of light intensity on growth and the production of the hepatotoxin cylindrospermopsin (CYN) in the cyanobacterial harmful algal bloom species Cylindrospermopsis raciborskii was investigated using cultured isolates grown in N-free media under a series of neutral density screens... -
Insights from full-rotation Nelder spacing trials with Eucalyptus in São Paulo, Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JL Stape --- Department of Forestry and Environmental Resources, USA D Binkley --- Natural Resource Ecology Laboratory, USAThe choice of spacing among trees for operational plantations is typically based on one or more experimental plantations that test for the response of tree and stand growth to a range of tree-to-tree distances. The most common design for spacing... -
Photosynthetic differences between Microcystis aeruginosa and Oscillatoria simplicissima in relation to species succession in the Vaal River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Venter --- School of Environmental Sciences and Development (Botany Division), S du Plessis --- School of Environmental Sciences and Development (Botany Division), PDR van Heerden --- School of Environmental Sciences and Development (Botany Division), AJ Strauss --- School of Environmental Sciences and Development (Botany Division), J Bezuidenhout --- School of Environmental Sciences and Development (Botany Division),In 1991 Oscillatoria simplicissima replaced Microcystis aeruginosa in the Vaal River, South Africa. This study explored the reason for this succession by looking at the photosynthetic performance of these two cyanoprokaryotes at different temperatures, light intensities and N:P ratios. Microcystis... -
Quambalaria species: increasing threat to eucalypt plantations in Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: GS Pegg AJ Carnegie MJ Wingfield A DrenthSpotted gum (Corymbia citriodora subsp. variegata and C. maculata) is a valuable source of commercial timber and suitable for a wide range of different soil types in eastern Australia. The main biological constraint to further expansion of spotted gum plantations... -
Predictors of topical steroid misuse among patrons of pharmacies in Pretoria
Item type: Journal Article • Journal: South African Family Practice • Authors: N Malangu --- National School of Public Health, University of Limpopo, GA Ogunbanjo --- Department of Family Medicine and Primary Health Care,Background: -
An ultrastructural investigation of Argulus personatus Cunnington, 1913 (Crustacea: Branchiura) from Lake Tanganyika, northern Zambia
Item type: Journal Article • Journal: African Zoology • Authors: Quinton Tam --- Department of Zoology, South Africa Annemarié Avenant-Oldewage --- Department of Zoology, South Africa Ernest H. Williams --- Department of Marine Sciences,Sixteen male and one female specimen of Argulus personatus Cunnington, 1913, were collected from Bathybates ferox Boulenger, 1898, from Lake Tanganyika in northern Zambia. Light and scanning electron microscopy (SEM) examinations documented a thickening of cuticle located on the dorsal... -
Lights out, let’s move about: locomotory activity patterns of Wagner’s gerbil from the desert of Saudi Arabia
Item type: Journal Article • Journal: African Zoology • Authors: A.N. Alagaili --- KSU Mammals Research Chair, Department of Zoology, College of Science, Saudi Arabia O.B. Mohammed --- KSU Mammals Research Chair, Department of Zoology, College of Science, Saudi Arabia N.C. Bennett --- KSU Mammals Research Chair, Department of Zoology, College of Science, Saudi Arabia M.K. Oosthuizen --- Mammal Research Institute, Department of Zoology & Entomology, South AfricaWe investigated the circadian activity rhythm in the little-studied Wagner’s gerbil (Gerbillus dasyurus) from the Raydah Protected Area, southwestern Saudi Arabia. In order to assess whether these animals possess an endogenous rhythm of locomotor activity that entrains to the light:... -
The Shockley five-parameter model of a solar cell: A short note
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: H.A. Koffi --- Department of Physics, Ghana A. Kuditcher --- Department of Physics, Ghana V.C.K. Kakane --- Department of Physics, Ghana E.A. Armah --- Department of Physics, Ghana A.A. Yankson --- Department of Physics, Ghana J.K.A. Amuzu --- Department of Physics, GhanaThis paper is concerned with an alternative formulation of the Shockley five-parameter model of a solar cell. This formulation leads to an explicit relationship between the short-circuit current and the light-generated current and the direct determination of the light-generated current... -
Differential dependence of apple (Malus domestica Borkh.) cultivars on the xanthophyll cycle for photoprotection
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Simeon Hengari --- WRaDAC, Namibia Karen I Theron --- Department of Horticultural Science, South Africa Stephanie JE Midgley --- 84 Arum Road, South Africa Willem J Steyn --- Department of Horticultural Science, South AfricaThe dependence of fruit peel photosystems of ‘Granny Smith’, ‘Braeburn’, ‘Fuji’, ‘Golden Delicious’ and ‘Topred’ apple (Malus domestica Borkh.) peel on the xanthophyll cycle for photoprotection was studied under laboratory conditions. Mature fruit peel was either treated with 1 mm dithiothreitol... -
Characterisation of a Tunisian coastal lagoon through hyperspectral underwater irradiance
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DH Nourisson --- Department of Biology, Italy F Scapini --- Department of Biology, Italy L Massi --- Department of Biology, Italy L Lazzara --- Department of Biology, ItalyNorth African coastal lagoons are unique ecosystems that often suffer degradation due to human activities. Therefore, monitoring methods are required to identify stressors and assist with the management of these valuable and often understudied ecosystems. A synthetic indicator of water... -
Metal accumulation in House Sparrow (Passer domesticus) from Thohoyandou, Limpopo province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Nathan J Baker --- Department of Zoology, South Africa Simone Dahms --- Department of Zoology, South Africa Ruan Gerber --- Department of Zoology, South Africa John Maina --- Department of Zoology, South Africa Richard Greenfield --- Department of Zoology, South AfricaStudies on metal pollution (cadmium, cobalt, chromium, copper, manganese and nickel) in South African terrestrial environments are severely lacking. Due to being relatively unaffected by industrialisation, the Thohoyandou region may provide data on natural levels of metals for use as... -
Moringa (Moringa oleifera) leaf extracts inhibit spore germination of Alternaria solani, causal agent of early blight disease of tomato (Solanum lycopersicum)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Culver Mvumi --- Department of Plant Production and Soil Science, South Africa Elizabeth Ngadze --- Department of Crop Science, Zimbabwe Diana Marais --- Department of Plant Production and Soil Science, South Africa Elsa S du Toit --- Department of Plant Production and Soil Science, South Africa Brighton M Mvumi --- Department of Soil Science and Agricultural Engineering, ZimbabweAlternaria solani is highly infective and can sporulate on tomato at 13.2 × 106 spores mL−1. The fungicidal effect of Moringa oleifera leaf chloroform and aqueous extracts (MLCE and MLAE, respectively) was investigated in vitro to determine the inhibitory effect... -
Estimating Cape hare occupancy and abundance in southern Tunisia using spotlighting data
Item type: Journal Article • Journal: African Zoology • Authors: Chammem Mohsen --- Laboratoire d’Elevage et de la Faune Sauvage, Tunisia Karssene Yamna --- Laboratoire d’Elevage et de la Faune Sauvage, Tunisia Jarray Mohsen --- Laboratoire d’Elevage et de la Faune Sauvage, Tunisia Khorchani Touhami --- Laboratoire d’Elevage et de la Faune Sauvage, TunisiaThis study outlines the importance of integrating spotlighting data and occupancy modelling to estimate the spatial occupancy, abundance and habitat preferences of Cape hares Lepus capensis in southern Tunisia. Exploring the spatial distribution pattern of this species is problematic because... -
Managing human disturbance: factors influencing flight-initiation distance of birds in a West African nature reserve
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Bukola Braimoh --- AP Leventis Ornithological Research Institute, University of Jos, Nigeria Soladoye Iwajomo --- Department of Zoology, Faculty of Science, Nigeria Mark Wilson --- British Trust for Ornithology, UK Adams Chaskda --- AP Leventis Ornithological Research Institute, University of Jos, Nigeria Afan Ajang --- AP Leventis Ornithological Research Institute, University of Jos, Nigeria Will Cresswell --- AP Leventis Ornithological Research Institute, University of Jos, NigeriaEscape behaviour in response to perceived predators can be employed as a guide when designating protected areas around sensitive bird species to minimise the impact of human disturbance. A key measure of escape response is flight-initiation distance (FID), the distance... -
Retention of the flight-adapted avian finger-joint complex in the Ostrich helps identify when wings began evolving in dinosaurs
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Joel D Hutson --- Department of Biological Sciences, USA Kelda N Hutson --- Earth Science, USAThe functional anatomies of avian finger joints have never been compared with those of the basal avian Archaeopteryx lithographica or maniraptoran theropod dinosaurs. These startling oversights are due to unfamiliarity of the joints outside of highly specialised studies of bird-wing... -
Trophic state and nutrient limitation in Lake Baringo, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Okech --- Department of biological sciences, Kenya N Kitaka --- Department of biological sciences, Kenya SO Oduor --- Department of biological sciences, Kenya D Verschuren --- Department of Biology, BelgiumThe trophic state of Lake Baringo and factors that could be limiting the development of algal biomass in it were investigated during one wet/dry hydrological cycle in 2014–2015. Water samples were analysed for dissolved inorganic nutrients, including , and ,... -
Hunting flight speeds of five southern African raptors
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Lorinda A Hart --- School of Life Sciences, South Africa Erin P Wreford --- School of Life Sciences, South Africa Mark Brown --- School of Life Sciences, South Africa Colleen T Downs --- School of Life Sciences, South AfricaThe flight speeds of hunting falconry birds were determined using global positioning system data loggers. Until now, the hunting flight speed of African raptors has not been directly measured. We predicted that hunting flight speeds would differ between species and... -
Techno-economic viability of off-grid standalone PV-powered LED street lighting system in Lagos, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: M. O. Babatunde --- Department of Electrical/Electronic Engineering, Nigeria T. O. Akinbulire --- Department of Electrical/Electronic Engineering, Nigeria P. O. Oluseyi --- Department of Electrical/Electronic Engineering, Nigeria M. U. Emezirinwune --- Department of Electrical/Electronic Engineering, NigeriaThe majority of the street lighting systems in Nigeria are predominantly composed of inefficient lighting fixtures powered either by the grid or diesel generators. Due to the epileptic nature of the grid and the fluctuations in diesel fuel pump prices,... -
A STEEP-cum-SWOT approach for maintenance strategy evaluation for an off-grid PV-powered street lighting system
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Desmond Eseoghene Ighravwe --- , Nigeria Moses Olubayo Babatunde --- , Nigeria Iheanacho Henry Denwigwe --- , Nigeria Daniel Osezua Aikhuele --- , NigeriaRecently, the installation of street light systems in remote communities has experienced significant improvement. This improvement has a direct relationship with the innovations in off-grid standalone energy sources. However, there exists sparse information on standalone PV-powered street light system maintenance... -
Determination of the series resistance of a solar cell through its maximum power point
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: H. A. Koffi --- , Accra, Ghana A. A. Yankson --- , Accra, Ghana A. F. Hughes --- , Accra, Ghana K. Ampomah-Benefo --- , Accra, Ghana J. K. A. Amuzu --- , Accra, GhanaA simple analytical approach has been developed to determine the series resistance, R s, of a solar cell. The method adopted here depends only on the knowledge of the open-circuit voltage, V oc, and the current and voltage at the... -
Using digital photography to study moult extent in breeding seabirds
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Alexis Osborne --- , South Africa Peter G Ryan --- , South AfricaScoring moult from live birds in the hand takes time, thereby increasing the handling stress to the birds. We show that digital photography can be used to efficiently study moult extent across multiple feather tracts. We photographed the upper wings... -
Disease surveillance and farmers’ knowledge of Brachiaria (Syn. Urochloa) grass diseases in Rwanda
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Bellancile Uzayisenga --- , Kenya Mupenzi Mutimura --- , Rwanda James W Muthomi --- , Kenya Agnes W Mwang’ombe --- , Kenya Sita R Ghimire --- , KenyaBrachiaria (syn. Urochloa) is one of the most important tropical forages grass of African origin. Its performance is affected by different constraints, including diseases. This study assessed the distribution, incidence and severity of Brachiaria diseases and documented farmers’ knowledge on... -
Response of improved Brachiaria (Urochloa) grass cultivars to foliar diseases and their agronomic performances in Rwanda
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Bellancile Uzayisenga --- , Kenya Mupenzi Mutimura --- , Rwanda James W Muthomi --- , Kenya Agnes W Mwang’ombe --- , Kenya Sita R Ghimire --- , KenyaDiseases have emerged as one of the major challenges of Brachiaria production in Africa. Nine Brachiaria cultivars were evaluated for leaf rust, leaf spot and leaf blight diseases and agronomic performances in two agro-ecological zones of Rwanda. The relationships between... -
Local variations in the response of birds to human presence in urban areas
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Tristan Nyatanga --- , Zimbabwe Henry Ndaimani --- , South Africa Tanyaradzwa Gaza --- , ZimbabweStudies that seek to understand the local variations in the response of birds to human disturbance in urban areas are important for conservation. This article investigated the contribution of human population density in the different urban land use zones of... -
Timing, duration and symmetry of moult in Cape Gannets
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Oluwadunsin E Adekola --- , South Africa Robert JM Crawford --- , South Africa Bruce M Dyer --- , South Africa Azwianewi B Makhado --- , South Africa Leshia Upfold --- , South Africa Peter G Ryan --- , South AfricaLittle has been reported on moult in sulids, including gannets. The Cape Gannet Morus capensis is an endangered seabird endemic to southern Africa. We describe the timing, duration, symmetry and sequence of flight feather moult in Cape Gannets from two... -
Artificial light improves productivity of mini-cuttings in a clonal minigarden of Eucalyptus benthamii and E. dunnii
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Enéas Ricardo Konzen --- , Brazil Natália Saudade de Aguiar --- , Brazil Marcio Carlos Navroski --- , Brazil Clenilso Sehnen Mota --- , Brazil Leticia Miranda --- , Brazil Regiane Abjaud Estopa --- , Brazil Erasmo Luis Tonett --- , Brazil Mariane de Oliveira Pereira --- , BrazilEucalypts are economically important worldwide, being largely propagated by clonal means, that is, frequently achieved by mini-cuttings. Regional climatic conditions, however, interfere with this strategy. Southern Brazil, especially in higher altitudes, has a considerable number of cloudy and cold days... -
Objective understanding of five front-of-pack labels among consumers in Nelson Mandela Bay, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Tracey Ruth Hutton --- , South Africa Annelie Gresse --- , South Africa -
ECOWAS and the prevalence of energy-inefficient lighting technologies: Any hope of achieving SDG 7.3?
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Edwin Albert Umoh --- , Nigeria Yahaya Muhammad Bande --- , Nigeria Omokhafe James Tola --- , NigeriaA region-adaptive hierarchical framework for realizing Sustainable Development Goal 7.3 is proposed in this paper, using Nigeria as a case study for strategy adoption and adaptation. In 2013, the Economic Community of West African States (ECOWAS) rolled out strategic plans... -
Impacts and trapping of ambrosia beetles Euwallacea fornicatus and E. similis in Acacia plantations in Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tran Xuan Hung --- Vietnamese Academy of Forest Sciences, Vietnam Pham Quang Thu --- Vietnamese Academy of Forest Sciences, Vietnam Nguyen Minh Chi --- Vietnamese Academy of Forest Sciences, Vietnam Le Van Binh --- Vietnamese Academy of Forest Sciences, Vietnam Bernard Dell --- Vietnamese Academy of Forest Sciences, VietnamThere are over two million hectares of Acacia plantations in Vietnam and loss from infestations of ambrosia beetles is of increasing concern. In this study, we first determined the key taxa and the extent of damage, and then identified effective... -
Social impact of HIV/AIDS on clients attending a teaching hospital in Southern Nigeria
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Ofonime E. Johnson [d125e19]People living with human immunodeficiency virus and acquired immune deficiency syndrome (PLWHA) face numerous social challenges. The objectives of this study were to assess the level of self-disclosure of status by PLWHA, to describe the level and patterns of stigma... -
Calonectria species diversity on eucalypts in Indonesia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Marthin Tarigan --- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, South Africa Nam Q Pham --- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, South Africa Fahimeh Jami --- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, South Africa Leonardo SS Oliveira --- , Brazil Muhammad Agni Saha --- Asia Pacific Resources International Holdings Ltd (APRIL), Indonesia Alvaro Durán --- Asia Pacific Resources International Holdings Ltd (APRIL), Indonesia Michael J Wingfield --- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, South AfricaDiseases increasingly threaten the rapidly expanding eucalypt plantation industry of Indonesia. Of these, leaf blight caused by Calonectria spp. is considered amongst the more important problems, causing losses both in production nurseries and plantations. Using DNA sequence data based on... -
Pattern and intensity of moult in White-capped/Shy Albatrosses Thalassarche steadi/cauta
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Peter G Ryan --- University of Cape Town, South Africa Oluwadunsin E Adekola --- University of Cape Town, South AfricaAlbatrosses typically only replace a subset of flight feathers each annual moult cycle. We scored the moult of 662 White-capped/Shy Albatrosses Thalassarche steadi/cauta, using birds that had been killed by longline fisheries off South Africa. Most adults and immatures alternated... -
Aspirations and meanings of lighter skin tone in the African context: A rapid review
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Sikelelwa Ntsokota --- North-West University, South Africa Lelanie Malan --- North-West University, South Africa Esmé van Rensburg --- North-West University, South Africa Werner de Klerk --- North-West University, South AfricaAcross cultures, skin tone is associated with social impressions and outcomes, but the meanings and implications of these associations has not garnered clear research evidence. This rapid review aimed to aggregate the evidence regarding the ascribed meanings and implications of... -
The number of human-simulated predators influences the escape behaviour of bird species in a West African protected area
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Ngozi M Okafor --- AP Leventis Ornithological Research Institute, Nigeria Soladoye B Iwajomo --- University of Lagos, Nigeria Bukola DA Azaki --- University of Cape Town, South Africa Manu A Shiiwua --- AP Leventis Ornithological Research Institute, NigeriaContinuous human presence in protected and recreational areas can adversely affect wildlife. Birds perceive the approach by humans as predatory and mostly flee in response, which can be energetically costly, and leads to disruption of foraging activities and interactions with...
