A5071374385- Wildlife Ecology and Conservation
- Ecology and Vegetation Dynamics Studies
- Rangeland Management and Livestock Ecology
- Animal Ecology and Behavior Studies
- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Species Distribution and Climate Change
- Rangeland and Wildlife Management
- Ruminant Nutrition and Digestive Physiology
- Forest Insect Ecology and Management
- Forest Ecology and Biodiversity Studies
- Ecology and biodiversity studies
- Radiomics and Machine Learning in Medical Imaging
- Insect and Arachnid Ecology and Behavior
- Plant and animal studies
- Advanced Fiber Optic Sensors
- Coleoptera Taxonomy and Distribution
- Behavioral and Psychological Studies
- Radar Systems and Signal Processing
- Insect Utilization and Effects
- Scientific Computing and Data Management
- Semiconductor materials and devices
- Advanced SAR Imaging Techniques
- Research Data Management Practices
- Antenna Design and Optimization
Gauteng Department of Agriculture and Rural Development
2017-2018
Tshwane University of Technology
2007-2013
University of Pretoria
2012
Mammal Research Institute
2012
Westinghouse Electric (United States)
2002
Barr and Stroud (United Kingdom)
1988
Pilkington (United Kingdom)
1988
University of Glasgow
1980-1983
The preferential etching of gallium arsenide in has been studied. A mechanism for the process is discussed drawing on observation by optical and scanning electron microscopy, published results U H V surface analysis, state models. etch rates revealed planes are related to step densities, exposure "equilibrium" density surfaces migration lengths probable reactant species.
The objectives of the study were to determine species composition ticks infesting white and black rhinoceroses in southern Africa as well conservation status those tick that prefer rhinos hosts. Ticks collected opportunistically from had been immobilised for management purposes, 447 (Ceratotherium simum) 164 (Diceros bicornis) sampled South Africa, 61 Namibia, 18 12 Zimbabwe, 24 Zambia. Nineteen recovered, which two species, Amblyomma rhinocerotis Dermacentor rhinocerinus, A. was only...
There are several hypotheses as to the function of postcopulatory mate guarding. Control over mate‐guarding period by either sex could potentially influence relative reproductive success. Mate‐guarding behaviour in Gryllodes sigillatus was studied under conditions: 1. undisturbed pairs; 2. pairs with a single male intruder; 3. exposed acoustically, visually and olfactorily other males; 4. freely 5. females. The results provide support for spermatophore retention rival defence hypotheses....
The relative population numbers of rodents were studied in nine habitats and outside the N'washitshumbe enclosure site, Kruger National Park, before after burning firebreaks that surround enclosure. Trap success was exceptionally high, field work is suspected to have coincided with a Mastomys explosion. This genus dominated small mammal communities burn, never disappeared from burnt patches. Its also did not crash directly as been reported most other studies. Movement areas observed, which...
In eastern and southern Africa, some ranch owners are now keeping cattle overnight in temporary corrals (hereafter referred to as kraals) within rangelands for short durations improve grass production. However, this has profound effects on the woody plant community. For instance, break stems strip them of foliage, initiating resprouting. The resprouts produced have high foliar nitrogen (N) reduced condensed tannin (CT) concentrations, making attractive herbivores. aim study was determine key...
Vegetation cover in grasslands typically fluctuates over time, for example, declining with grazing and disappearing entirely burning. This temporal change vegetation may impact the composition of vertebrate communities by altering habitats or perceived predation pressure. We manipulated a high-elevation (ca. 1240–1500 m above sea level) grassland ecosystem measured its effect on community structure birds small mammals using Before-After-Control-Impact study design. established 12 plots (each...
Abstract Mountains provide important habitats for many species and often have high levels of biodiversity endemism. Habitat associations terrestrial small mammals were investigated at Wakefield Farm the foothills Drakensberg Mountains, South Africa from July 2015 to January 2016. Sherman live traps used capture on 35 grids in six different habitats. A total 472 individuals, 14 species, recorded, comprising: 10 rodents, three shrews one golden mole. Species diversity differed across seasons....
The relative population numbers of rodents were studied in nine habitats and outside the N’washitshumbe enclosure site, Kruger National Park, before after burning firebreaks that surround enclosure. Trap success was exceptionally high, field work is suspected to have coincided with a Mastomys explosion. This genus dominated small mammal communities burn, never disappeared from burnt patches. Its also did not crash directly as been reported most other studies. Movement areas observed, which...
Multi-method sampling approaches are becoming increasingly popular for investigating species occurrence at specific sites, as there is a need to accurately monitor with limited time and resources. In this study, multi-method comparative approach was used survey bat in the foothills of Drakensberg Mountain range KwaZulu-Natal province, South Africa. We historical museum records distribution modelling (SDM) predict which would likely occur our study area. then compared physical capture (by...
Despite the importance of termites in structure and function savanna ecosystems, long-term studies that examine effects several disturbance factors on termite communities are limited constraining our understanding determinants assemblages savanna. We determined six random plots (100 m × 2 m) each established no fire, low moderate fire frequency sites a communal area commercial cattle-wildlife ranch semi-arid savanna, southwest Zimbabwe. Environmental variables i.e., soil plant were also...
Abstract Elephants are attracted to nutrient hotspots created through short duration overnight cattle corralling (hereafter kraaling) in natural rangelands at Debshan, a mixed cattle-wildlife private ranch central Zimbabwe, causing severe tree damage. We determined the effect of age hotspot (i.e., time after kraal use) on elephant use and extent Elephant damage were assessed varying ages (6, 12, 24, 36 48 months surrounding landscape. also compared Acacia karroo bark soil concentration...
Buprestidae is a large family of woodboring beetles with nearly 15,000 valid species. The well represented in South Africa; however, the distribution and hosts most species are unknown. abundance many generally correlated well-wooded areas since species' larvae inhabit dead or dying wood. Ezemvelo Nature Reserve, being predominantly grassland, has rocky ridges dominated by Acacia caffra (Thunb.) Willd., Protea Meisner, Mundulea sericea (Willd.) Chev. majority larger buprestids were found...
A novel single index waveguiding structure is described with possible applications in the field of integrated optics. By exploiting preferential etch characteristics GaAs, waisted-rib structures have been fabricated on surface bulk material which are capable supporting bound modes.
Grazing by large mammals alters vegetation physiognomy, consequently changing habitat suitability for small mammal communities. We investigated the response of terrestrial to grazing wild and domesticated ungulates at boundary a protected area (Telperion Nature Reserve) surrounding cattle ranches in Mpumalanga, South Africa over two seasons. Fifteen paired grids were set on either side fence which trapped Sherman live traps placed flat ground. A total 11 760 trap nights resulted capture 187...
Abstract Short duration overnight cattle kraaling in natural rangelands creates nutrients hotspots attractive to a diverse suite of large mammalian herbivores. However, few studies have determined the use these sites by We number animal sightings per day from camera traps and used them as proxies for newly created nutrient varying ages (1, 2, 3 4 years) surrounding vegetation. Six herbivores different sizes belonging three feeding guilds viz . grazers (Burchell’s zebra Equus quagga burchelli...
The genus Evides Dejean, 1833 (Coleoptera: Buprestidae) belongs to the family of wood-boring beetles commonly known as jewel beetles. This comparative study was undertaken on morphological characteristics three species from field specimens, private collections and at Transvaal Museum Natural History. consists eleven one subspecies in total worldwide. Nine are endemic Sub-Saharan Africa. One is recorded India further Laos Vietnam: Bellamy (World Catalogue, prep.) objective quantify...