A5004011929- Wildlife Ecology and Conservation
- Bat Biology and Ecology Studies
- Animal Ecology and Behavior Studies
- Evolution and Paleontology Studies
- Ecology and Vegetation Dynamics Studies
- Marine animal studies overview
- Physiological and biochemical adaptations
- Sperm and Testicular Function
- Aquatic Invertebrate Ecology and Behavior
- Species Distribution and Climate Change
- Ecology and biodiversity studies
- Rangeland Management and Livestock Ecology
- Marine Biology and Ecology Research
- Avian ecology and behavior
- Primate Behavior and Ecology
- Neuroendocrine regulation and behavior
- Environmental and Biological Research in Conflict Zones
- Reproductive Physiology in Livestock
- Animal Behavior and Reproduction
- Marine and coastal plant biology
- Mollusks and Parasites Studies
- Marine Biology and Environmental Chemistry
- Wildlife-Road Interactions and Conservation
- Animal Behavior and Welfare Studies
- Reproductive biology and impacts on aquatic species
Rhodes University
2009-2023
University of Mpumalanga
2018-2023
Cornell University
1998
University of Fort Hare
1998
University of KwaZulu-Natal
1980-1982
This is a magnificent book that deserves place on the bookshelves of everyone with an interest, professional or amateur, in biology fauna Africa. While focus authors might have been biogeography and taxonomy, this emphasized title, species descriptions include information echolocation feeding ecology, roosting sites reproduction. far from dry difficult to read synthesis taxonomy bats but rather easy consolidation much what we know about southern Central In many ways it atlas adaptation...
Abstract The mature sperm of three species the subfamily Mytilinae ( Choromytilus meridionalis, Mytilus galloprovincialis, Aulacomya ater ) are primitive type. 50–55 μm long, with a distinct head, midpiece four to six mitochondria, and tail. In all acrosome is in form an elongated hollow cone; yet each has its own characteristic morphology, indicating that ultrastructure can be used as aid bivalve identification. A reexamination comparison acrosomes from five subclasses show subclass unique...
Previous assessments of wildlife road mortality have not used directly comparable methods and, at present, there is no standardized protocol for the collection such data. Consequently, are internationally comparative statistics documenting roadkill rates. In this study, we a combination experimental trials and transects to design assess rates on both paved unpaved roads. Simulated were positioned over 1 km distance, conducted eight different speeds (20-100 km·h(-1)). The recommended was then...
Abstract Habitat selection and feeding ecology of a reintroduced population cheetahs Acinonyx jubatus were studied in 16 000 ha game reserve the Eastern Cape Province (South Africa). Seventy per cent is characterized by very dense thicket vegetation (valley bushveld) remainder open savanna‐like. The results illustrated strong effect sex group size on behaviour cheetahs. coalition (three adult males) killed significantly larger animals (55% kills weighed more than 65 kg) single female (less...
Global biodiversity and ecosystem function are the result of complex networks interactions feedbacks between animals their environments, which in turn affected by organisms they host. Understanding these networks, including main drivers responses to ecological environmental changes global implications, requires adopting a systems-based perspective. We advocate for this approach characterizing framework centered around bats, globally-distributed mammalian order, dual roles as both inhabitants...
Light and transmission electron microscopy of the spermatozoa spermatogenesis 16 species (in three genera, Patella, Helcion, Cellana) patellid limpet have shown that head lengths sperm range from 3 to 13 μm, each has a with unique morphology, indicating can be used as taxonomic character. Although spermatozoon structure is specific, five types recognized, based on size, shape, nucleus acrosome. The occurrence morphological sperm, one which (Cellana capensis) particularly different other...
The effects of physiological concentrations melatonin on motility spermatozoa from Wistar rats were assessed in vitro. Melatonin had dose-dependent negative sperm forward progression, the quality and a index. Some, but not all these due to ethanol (0.5% final concentration) which was used as solvent for melatonin. Addition incubation medium altered pH, increased pH significant effect aspects motility. Finally, overlay oil, is routine part many culture systems, an ameliorating that probably...
The structure of the eyes two South African bat species, Rousettus aegyptiacus (Megachiroptera: Pteropodidae) and Rhinolophus capensis (Microchiroptera: Rhinolophidae) was examined compared by means light microscopy. both species exhibit characteristics a typical 'nocturnal eye' (presence pf only rods in retina; cornea shows marked curvature occupies about one third globe; anterior posterior chambers are very large relation to vitreous) neither possess fovea. main difference occurs choroid...
The mature sperm of Perna perna is 50-55 µm long and comprises three regions: a head, mid-piece tail. head incorporates round electron-dense nucleus an elongated cone-shaped acrosoma consists ring five mitochondria, in the centre which distal centriole from tail arises. early spermatid characterized by large perinuclear cytoplasm containing numerous mitochondria proacro- somal vesicles. By mid-spermiogenesis nuclear chromatin begins to condense, proacrosomal vesicles coalesce form acrosome...
AbstractArid and semi-arid environments are characterized by extreme fluctuations in temperature low rainfall, which present significant challenges to the animals inhabiting these areas. However, presence of burrows may allow avoid climatic extremes predators act as valuable foraging sites. We assessed microhabitat conditions (maximum minimum temperature, relative humidity seed abundance) aardvark (Orycteropus afer) relation paired non-burrow areas at three sites South Africa. also describe...
Arid and semi-arid environments are characterized by extreme fluctuations in temperature low rainfall, which present significant challenges to the animals inhabiting these areas. However, presence of burrows may allow avoid climatic extremes predators act as valuable foraging sites. We assessed microhabitat conditions (maximum minimum temperature, relative humidity seed abundance) aardvark (Orycteropus afer) relation paired non-burrow areas at three sites South Africa. also describe extent...
Using a standard protocol, we conducted vertebrate roadkill surveys in the Greater Mapungubwe Transfrontier Conservation Area (GMTFCA), South Africa, which is World Heritage Site. A total of 991 were recorded on paved roads and 36 unpaved roads. Identifiable comprised 162 species from 24 orders 65 families. Ninety-three could not be identified to level. Roadkill counts strongly influenced by road type season. More was than Irrespective type, proportion greatest hot/wet season (4.3...
Abstract With an increase in the popularity of wildlife ranching southern Africa has come introduction non‐native (extralimital) mammalian herbivores. Financial gain arguably been at forefront these introductions, with little or no assessment ecological consequences. The diet three populations introduced giraffe Giraffa camelopardalis was assessed by direct observation Eastern Cape Province, South between January 2002 and October 2003, as first step towards understanding role played region....
Transmission electron microscopy of the spermatozoa and spermatogenesis 11 species (in three suborders Chitonina, Acanthochitonina, Lepidopleurina) chiton has shown that each a sperm with unique morphology indicating can be used as taxonomic character. Although structure is species-specific, similarities between within subfamilies recognized. The from Chitonina Acanthochitonina have head comprising nuclear material only, anterior portion which in form long thin (approximately 80 nm diameter)...
Subsistence pastoralists often view large carnivores negatively given that any loss of livestock is likely to represent a significant economic cost. Consequently, carnivore conservation initiatives in rural landscapes should incorporate appropriate human–carnivore conflict mitigation strategies. In this study, structured interviews with local residents (n = 247) were used for determining attitudes toward African wild dogs (Lycaon pictus) among communities neighboring two protected areas...
Journal Article COMPARATIVE SPERMATOLOGY OF THREE SPECIES DONAX (BIVALVIA) FROM SOUTH AFRICA Get access A.N. HODGSON, HODGSON *Department of Zoology & Entomology, Rhodes UniversityGrahamstown 6140, South Africa Search for other works by this author on: Oxford Academic Google Scholar R.T.F. BERNARD, BERNARD G. VAN DER HORST †Department Physiological Sciences, University the Western CapeSouth Molluscan Studies, Volume 56, Issue 2, May 1990, Pages 257–265,...
Summary. Male Cape horseshoe bats were studied in the Province of South Africa (33°17′S, 26°25′E) between January 1983 and June 1985. The reproductive cycle is characterized by reactivation seminiferous tubules early summer (October) after a 4-month (June to September) period winter inactivity. Spermiogenesis occurred April, spermatozoa released epididymides April May. was associated with Leydig cell activity increasing plasma testosterone concentrations. At this time components accessory...
INTRODUCTION Two forms of the genus Mytilus, M. edulis L. and galloprovincialis Lmk inhabit rocky shores Devon Cornwall (Hepper, 1957). According to Gosling (1984), controversy has existed since 1860 as whether is a separate species or subspecies . In review systematic status , (1984) analysed criteria used identify classify this form Mytilus did not reach any firm conclusion on these mytilids, but suggest that evidence favoured placing variety, ecotype even