A5018047647- Avian ecology and behavior
- Wildlife Ecology and Conservation
- Animal Behavior and Reproduction
- Ecology and Vegetation Dynamics Studies
- Animal Ecology and Behavior Studies
- Species Distribution and Climate Change
- Plant and animal studies
- Genetic and phenotypic traits in livestock
- Genetic diversity and population structure
- Rangeland and Wildlife Management
- Wildlife-Road Interactions and Conservation
- Animal Vocal Communication and Behavior
- Evolutionary Psychology and Human Behavior
- Digital Mental Health Interventions
- Human-Animal Interaction Studies
- Bird parasitology and diseases
- Social Media and Politics
- Botany and Plant Ecology Studies
- Animal Genetics and Reproduction
- Environmental Toxicology and Ecotoxicology
- Fire effects on ecosystems
- Marine and fisheries research
- Impact of Technology on Adolescents
- Marine animal studies overview
- Insect and Arachnid Ecology and Behavior
University of Cape Town
2013-2024
Oak Park Public Library
2023-2024
FitzPatrick Institute of African Ornithology
2015
Tshwane University of Technology
2009
Ministry of Environment and Tourism
1994-2005
Uppsala University
1997
University of the Witwatersrand
1984-1993
Acadia University
1988
University of South Dakota
1968
University of Minnesota System
1968
A classic example of extreme morphological adaptation to the environment is neck giraffe (Giraffa camelopardalis), a trait that most biologists since Darwin have attributed competition with other mammalian browsers. However, in searching for present-day evidence maintenance long neck, we find during dry season (when feeding should be intense) generally feed from low shrubs, not tall trees; females spend over 50% their time necks horizontal; both sexes faster and often bent; sympatric...
Domestic cats (Felis catus) have contributed to the extinction of indigenous species worldwide, but impacts in Africa are unstudied. We compare prey returned home from three questionnaire surveys (2009, 2010 and 2013/14) Cape Town, South Africa, with footage some same wearing animal-borne video cameras (KittyCams), assess differences actual predation vs. returns. Town borders Table Mountain National Park (TMNP), so may on animals a protected area. Urban edge (UE) deep urban (DU) did not...
Abstract Global climate warming, now conclusively linked to anthropogenically-increased CO2 levels in the earth's atmosphere, has already had impacts on biodiversity and is predicted threaten more than 1 million species with extinction by 2050. Climate change southern Africa expected involve higher temperatures lower rainfall, less predictability a greater frequency of severe storms, fires El Niño events. The changes birds — continent most at risk from have hardly been explored, yet many...
Obligate siblicide, known as ‘cainism’ in large raptors, is a taxonomically widespread avian phenomenon that remains inexplicable simple consequence of food stress: two young can be raised to independence experimentally manipulated nests, and supplements do not decrease sibling aggression. A review the Falconiformes identified 23 species which obligate facultative cainism regular. All have small clutches deferred acquisition adult plumage. cainists particular are large, long‐lived...
Many long-distance migrating shorebird (i.e., sandpipers, plovers, flamingos, oystercatchers) populations are declining. Although regular monitoring programs exist worldwide, most estimates of population trends and sizes poor or nonexistent. We built a state-space model to estimate trends. Compared with more commonly used methods trend estimation, models mechanistic, allow for the separation observation state process, can easily accommodate multivariate time series nonlinear fitted count...
Developing an effective conservation strategy for a critically endangered species relies on identifying the most pressing threats to species. One approach elucidate these long-lived animal with high territorial fidelity is identify factors associated abandonment. The Bearded Vulture (Gypaetus barbatus) has declined dramatically in southern Africa over past few decades, nearly 50% of known territories being abandoned. In this study we examine evidence 3 hypotheses: that abandonment was (1)...
Obligate siblicide, known as ‘cainism’ in large raptors, is a taxonomically widespread avian phenomenon that remains inexplicable simple consequence of food stress: two young can be raised to independence experimentally manipulated nests, and supplements do not decrease sibling aggression. A review the Falconiformes identified 23 species which obligate facultative cainism regular. All have small clutches deferred acquisition adult plumage. cainists particular are large, long‐lived...
Background Adolescence is a vulnerable developmental period, characterized by high rates of mental health concerns, yet few adolescents receive treatment. Public libraries support providing them with access to teen programming, technological resources, and have recently been services. Digital (DMH) services may help provide scalable solutions for their adolescent patrons could be well positioned address the needs historically underrepresented racial ethnic (HURE) adolescents; however, little...
Habitat rehabilitation or intervention to prevent species declines are rarely employed in Africa. I argue that despite protection national parks, active is necessary halt southern Africa’s Greater ( Phoenicopterus ruber ) and Lesser Phoeniconaias minor Flamingo populations. Flamingos long‐lived breed sporadically at only two localities Africa: the Makgadikgadi Pans Botswana Etosha National Park Namibia. Despite well‐publicized breeding on Pan, flamingos have experienced three major events 40...
Breeding Northern Harriers, Circus cyaneus, and their principle prey, the vole Microtus pennsylvanicus, underwent synchronous fluctuations in New Brunswick between 1980 1984. Microtines were abundant 1983 significantly tracked by number of nesting harriers (r = 0.90), polygynous males 0.89), harem females mean clutch size 0.94), but not reproductive success successful 0.72). Male nest defence likewise exhibited a strong relationship 0.99, n 3) with prey abundance, predation did not. An...
In polygynous Northern Harriers (Circus cyaneus) aerial displays reflect male body condition, and are therefore difficult to fake. The most vigorously displaying males attract the largest harems, such an accurate measure of a male's potential provision their mates (the single important influence on female fecundity). Whether females preferentially pick intensely because they in better condition or vigorous associated with higher provisioning rates is unknown, but evidence suggests that both...
Recent years have witnessed a resurgence in tests of the evolution and origin great height long neck giraffe Giraffa camelopardalis. The two main hypotheses are (1) necks evolved through competition with other browsers allowing to feed above them ('competing browsers' hypothesis); or (2) for direct use intra-sexual combat gain access oestrous females ('necks-for-sex' hypothesis). Here, we review recent developments their relative contribution explaining evolution. Trends from Zimbabwean...
AbstractWe describe a collision of Africa's largest raptor, the Martial Eagle Polemaetus bellicosus with spinning blade at South African wind farm in Eastern Cape July 2016, and abandonment territory following second fatal an adult same farm. Most evidence suggest that eagle took no evasive action because she did not detect due to poor contrast abilities among raptors general. Increasing visibility black or "Signal Red" stripes is simple promising cost-effective mitigation should be further...
The population trend of Cape Cormorants (Phalacrocorax capensis), a species endemic to southern Africa and that feeds mainly on shoaling pelagic fish, is described for 50-year period, from 1956–57 2006–07. main breeding localities the are grouped in three regions Benguela upwelling ecosystem: guano platforms off central Namibia, islands Namibia South Africa's Western Province. From 1978–79, numbers increased, as result increased availability space adequate supplies food. In same remained...
Unrelated plants pollinated by similar animals tend to show convergent evolution of floral traits. Floral syndromes have been used successfully develop hypotheses about pollination systems but can be misleading when unusual morphology or mechanisms pollen transfer. A case in point is Erica halicacaba, a local endemic shrub on the Cape Peninsula South Africa. Its short-tubed greenish-yellowish flowers with narrow aperture considered insect pollinated. However, field observations, selective...