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A CONCEPTUAL MODEL OF A SILTATION SYSTEM IN SHALLOW LAKES WITH LITTORAL VEGETATION
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.J. Weisser --- Facultad de Ciencias,In shallow lakes a siltation system develops when wind driven water turbulence erodes the lake floor, silt is resuspended and transported by means of waterdrift into the littoral vegetation. Here, due to the resistance of the vegetation, the turbulence is... -
DEEP SEA, ESTUARINE AND FRESHWATER FISHES: LIFE HISTORY STRATEGIES AND ECOLOGICAL BOUNDARIES
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: S. J.M. Blaber --- Division of Fisheries, AustraliaThe life histories of fishes from three different ecosystems are compared and discussed with emphasis on species that move between habitats: between estuary and sea in tropical northern Australia; between bottom waters and pelagic waters of the temperate continental slope... -
Changes in the distribution of emergent aquatic plants in a brackish South African estuarine-lake system
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: IA RussellVegetation mapping in the Wilderness Lakes indicated that, between 1975 and 1997, prominent increases occurred in the distribution of the mapping units Phragmites australis (53.9ha; +53%), grass or fields (23.1ha; +35%) and scrub or trees (12.2ha; +45%). Over the same... -
Reeds as indicators of nutrient enrichment in a small temporarily open/ closed South African estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LRD Human --- Department of Botany, South Africa JB AdamsThis study investigated the use of δ15N levels in Phragmites australis reeds as an indicator of nutrient input into the small temporarily open/closed East Kleinemonde Estuary, Eastern Cape, South Africa. Nutrient (NH4 and SRP) concentrations decreased from the bank towards... -
Lessons learnt from a comparison of three ecosystem models for Port Phillip Bay, Australia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E. A. Fulton A. D. M. SmithComparing multiple models applied to the same system can be highly instructive, both with regard to the system of interest and the models. In this case, three ecosystem simulation models (ECOSIM, Bay Model 2 [BM2] and the Integrated Generic Bay... -
The presence of right whales in summer on the west coast of South Africa: the evidence from historical records
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: PB BestConventionally, southern right whales Eubalaena australis are portrayed as spending the summer on feeding grounds in the Antarctic and the winter on breeding grounds in coastal waters of the southern continents. Historical whaling records challenge this perception in the case... -
The first closure of shellfish harvesting due to domoic acid in Puget Sound, Washington, USA
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BD Bill FH Cox RA Horner JA Borchert VL TrainerThe first domoic acid (DA)-related closure of shellfish harvesting in Puget Sound, Washington, USA, occurred in early September 2003 owing to a DA concentration of 29ppm measured in blue mussels Mytilus edulis from Fort Flagler, Kilisut Harbor. Subsequent beach and... -
Trends and interventions in large whale entanglement along the South African coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MA Meÿer --- Department of Environmental Affairs, South Africa PB Best --- , South Africa MD Anderson-Reade --- , South Africa G Cliff --- , South Africa SFJ Dudley --- , South Africa SP Kirkman --- Department of Environmental Affairs, South AfricaThe major causes of large whale entanglement in South Africa are static fishing gear, especially the type associated with the West Coast rock lobster Jasus lalandii industry, and large-mesh gillnets that are set off the coast of KwaZulu-Natal (KZN) to... -
Acoustic behaviour of southern right whales in relation to numbers of whales present in Walker Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LH Hofmeyr-Juritz --- , South Africa PB BestEstimating numbers of whales present in an area from recorded call rates could be a useful conservation tool. We recorded southern right whale Eubalaena australis vocalisations and presence in Walker Bay on the south coast of South Africa. In all,... -
Evolutionary relationships of Slash Pine (Pinus elliottii) with its temperate and tropical relatives
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: R C Schmidtling --- USDA Forest Service, SRS, USA V Hipkins --- USDA Forest Service, USAAllozymes in bud tissue and monoterpene contents in xylem oleoresin of slash pine (Pinus elliottii) were analyzed from populations across the natural distribution, as well as those from other species in the AUSTRALES pines. Allozyme diversity measures of slash pine... -
Performance of four-year-old Australian and Papua New Guinean Acacia species/provenances at Kongowe, Kibaha, Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: AI Kindo --- Forestry and Beekeeping Division, Tanzania MA Mndolwa --- , Tanzania E Edward --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania SAO Chamshama --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, TanzaniaThis study to compare performance of three Australian–Papua New Guinean Acacia species/provenances (A. mangium, A. auriculiformis, A. crassicarpa) and A. julifera was conducted at Kongowe, Kibaha, Tanzania. Species/provenances were evaluated for survival, growth (diameter, height and volume), wood basic density... -
Comparative morphology of the oropharyngeal cavity of clinid fish (Perciformes: Clinidae), with particular attention to the form, number and distribution of taste buds, and dentition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: O Gon L Fishelson Y DelareaThe present study compares the form, number and distribution of taste buds (TB) in the oropharyngeal cavity (OC) of 17 species of clinid fish (Perciformes, Blennioidei, Clinidae) from different geographical regions (Australia, Taiwan, South Africa), and includes observations on dentition... -
Goose barnacle (Lepas australis) infestation of the Subantarctic fur seal (Arctocephalus tropicalis)
Item type: Journal Article • Journal: African Zoology • Authors: T. H. Setsaas --- Mammal Research Institute, Department of Zoology and Entomology, South Africa M. N. Bester --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaGoose barnacle infestations (Lepas australis) were found on the pelage of two female Subantarctic fur seals (Arctocephalus tropicalis) at Gough Island in the South Atlantic. The infested females were both relatively old at 11 and 15 years of age. We... -
Inshore occurrence of southern right whales (Eubalaena australis ) at Subantarctic Marion Island
Item type: Journal Article • Journal: African Zoology • Authors: M. Postma --- Department of Zoology and Entomology, South Africa M. Wege --- Department of Zoology and Entomology, South Africa M. N. Bester --- Department of Zoology and Entomology, South Africa D. S. van der Merwe --- Department of Zoology and Entomology, South Africa P. J. N. de Bruyn --- Department of Zoology and Entomology, South AfricaOpportunistic shore-based sightings of southern right whales Eubalaena australis for Marion Island (46°54’S, 37°45’E) were documented at five different times between 1974 and 2009. Whales were sighted between May and September and exclusively on the eastern lee side of the... -
The impact of high temperatures on foraging behaviour and body condition in the Western Australian Magpie Cracticus tibicen dorsalis
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Emily K Edwards --- School of Animal Biology, Australia Nicola J Mitchell --- School of Animal Biology, Australia Amanda R Ridley --- Centre for Evolutionary Biology, School of Animal Biology, AustraliaHigh temperatures can pose significant thermoregulation challenges for endotherms, and determining how individual species respond to high temperatures will be important for predicting the impact of global warming on wild populations. Animals can adjust their behaviour or physiology to cope... -
Productivity and cost of whole‑tree harvesting without debarking in a Eucalyptus nitens plantation in Tasmania, Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Martin Strandgard --- University of the Sunshine Coast, Australia Damian Walsh --- University of the Sunshine Coast, Australia Rick Mitchell --- University of the Sunshine Coast, AustraliaThere is increasing interest worldwide in using tree harvesting biomass as an energy source. Bark retained on logs is commonly used as an energy source, but is generally removed from eucalypt logs during harvest. In order to evaluate the potential... -
Goose barnacles on seals and a penguin at Gough Island
Item type: Journal Article • Journal: African Zoology • Authors: Ryan R. Reisinger --- Mammal Research Institute, Department of Zoology and Entomology, South Africa Marthán N. Bester --- Mammal Research Institute, Department of Zoology and Entomology, South AfricaDuring a survey of seals in September and October 2009 at Gough Island, South Atlantic Ocean, we recorded goose barnacles (Lepas australis) attached to the pelage of two of the 12 elephant seals (Mirounga leonina) inspected and one of the... -
Digestive parameters and energy assimilation of Cape porcupine on economically important crops
Item type: Journal Article • Journal: African Zoology • Authors: Kerushka R Pillay --- School of Life Sciences, University of KwaZulu-Natal, South Africa Amy-Leigh Wilson --- School of Life Sciences, University of KwaZulu-Natal, South Africa Tharmalingam Ramesh --- School of Life Sciences, University of KwaZulu-Natal, South Africa Colleen T Downs --- School of Life Sciences, University of KwaZulu-Natal, South AfricaTo better understand how Cape porcupines are able to successfully occupy many agricultural lands, we studied their digestive parameters and energy assimilation when fed three economically important agricultural crops (potatoes [Solanum tuberosum], sweet potatoes [Ipomoea batatas] and butternut [Juglans cinerea])... -
Measuring positive, psychological rewards: The validation of the Intrinsic Work Rewards Scale
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Michelle Renard --- Department of Industrial and Organisational Psychology, South Africa Robin J. Snelgar --- Department of Industrial and Organisational Psychology, South AfricaThis study sought to validate the Intrinsic Work Rewards Scale (IWRS) using a transnational sample. Respondents were 486 non-profit employees from Australia, South Africa and the United States of America (females = 72.0%; managerial/ supervisory job level employees = 57.4%)... -
Long-term trends in cetacean occurrence during the annual sardine run off the Wild Coast, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Caputo --- Department of Zoology and Entomology, South Africa PW Froneman --- Department of Zoology and Entomology, South Africa D du Preez --- School of Environmental Sciences, South Africa G Thompson --- KwaZulu-Natal Sharks Board, South Africa S Plön --- School of Environmental Sciences, South AfricaDuring the austral winter, cetaceans and other apex predators follow the annual northeastward movement of shoaling sardines, known as the sardine run, along the southeast coast of South Africa, including a 400-km stretch called the Wild Coast. In total, 131... -
Macroinvertebrate functional organisation along the longitudinal gradient of an austral temperate river
Item type: Journal Article • Journal: African Zoology • Authors: Sydney Moyo --- Department of Zoology and Entomology, South Africa Nicole B Richoux --- Department of Zoology and Entomology, South AfricaThe Kowie River, a relatively pristine system in South Africa, was sampled on four occasions over one year to determine if relative abundances of functional feeding groups (FFGs) of invertebrates changed along the longitudinal gradient, and if these changes matched... -
“I don't use a condom (with my regular partner) because I know that I'm faithful, but with everyone else I do”: The cultural and socioeconomic determinants of sexual partner concurrency in young South Africans
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Chris Kenyon --- GF Jooste Hospital, Andrew Boulle --- Infectious Diseases Epidemiology Unit, Department of Public Health and Family Medicine, University of Cape Town, Motasim Badri --- Department of Medicine, University of Cape Town, Valerie Asselman --- Infectious Diseases Referral Unit, GF Jooste Hospital,Finding ways to reduce the high rates of sexual partner concurrency is increasingly believed to be vital to controlling HIV spread in southern Africa. We describe the frequency and correlates of sexual partner concurrency in a representative sample of 3... -
Phylogenetic position of the southern rock lizard Australolacerta australis within the Lacertidae radiation
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Daniele Salvi --- CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Portugal Pierluigi Bombi --- SPACEnvironment, Italy Leonardo Vignoli --- Roma Tre University, ItalyThe southern rock lizard Australolacerta australis is a rock-dwelling lizard endemic to South Africa. The phylogenetic relationships of this species with other lacertid lizards are still not clear and have never been assessed in any phylogeny of Lacertidae using DNA...
