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Surficial sediments of the wave-dominated Orange River Delta and the adjacent continental margin off south-western Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Rogers AJ RauThe textural and compositional characteristics of the surficial shelf sediments north and south of the Orange River Delta are reviewed and compared. Sediments are fractionated and dispersed both north- and southwards of the Orange River mouth by wave action, longshore... -
Shelf currents, lee-trapped and transient eddies on the inshore boundary of the Agulhas Current, South Africa: their relevance to the KwaZulu-Natal sardine run
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MJ Roberts --- Oceans and Coasts, Department of Environmental Affairs, South Africa CD van der Lingen --- Branch Fisheries, Department of Agriculture, South Africa C Whittle --- Department of Oceanography, South Africa M van den Berg --- Oceans and Coasts, Department of Environmental Affairs, South AfricaThe existence and strength of the annual KwaZulu-Natal (KZN) sardine run has long been a conundrum to fishers and scientists alike ― particularly that the sardine Sardinops sagax migrate along the narrow Transkei shelf against the powerful, warm Agulhas Current... -
Changes in demersal fish assemblages on the west coast of South Africa, 1986–2009
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: LJ Atkinson --- , South Africa RW Leslie --- Fisheries Branch, Department of Agriculture, South Africa JG Field --- , South Africa A Jarre --- , South AfricaResearch survey data collected over 24 years (1986–2009) were used to explore long-term changes in demersal fish assemblages on the west coast of South Africa. Differences in spatial (latitude and depth) and temporal (seasonal and annual) factors were examined using... -
Effects of deep-sea eddies on the northern KwaZulu-Natal shelf, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Morris --- Bayworld Centre for Research and Education, South Africa T Lamont --- Oceans and Coasts, Department of Environmental Affairs, South Africa M J Roberts --- Oceans and Coasts, Department of Environmental Affairs, South AfricaThis paper describes the westward movement of a cyclonic eddy across the Mozambique Channel and the subsequent south-westward propagation of the eddy along the east coast of South Africa and its interaction with the shelf. A hydrographic survey on 13... -
Evidence of carbon transport between shelf and slope waters in the Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Swart HN Waldron L HutchingsThe world ocean is pivotal in the global carbon cycle and, subsequent to anthropogenic loading of the atmosphere with CO2, its ability to sequestrate photosynthetically-fixed carbon is important with respect to our ability to predict climate change. A study of... -
Interannual variability of sea surface temperature and circulation in the tropical western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Manyilizu --- Department of Oceanography, South Africa F Dufois --- Department of Oceanography, South Africa P Penven --- Institut de Recherche pour le Développement (IRD), France C Reason --- Department of Oceanography, South AfricaA regional ocean model was used to study interannual variations in the Tanzanian shelf region and offshore in the tropical western Indian Ocean for the period 1980–2007. The model was forced with surface winds and heat fluxes from the National... -
New evidence for a South Atlantic stock of humpback whales wintering on the Northwest African continental shelf
Item type: Journal Article • Journal: African Zoology • Authors: Koen Van Waerebeek --- COREWAM-Senegal, Musée de la Mer, Senegal Abdoulaye Djiba --- COREWAM-Senegal, Musée de la Mer, Senegal Jens-Otto Krakstad --- Institute of Marine Research, Norway Abdellahi Samba Ould Bilal --- Institut Mauritanien des Recherches Océanographiques et des Pêches (IMROP), Mauritania Idrissa L. Bamy --- Centre National des Sciences Halieutiques de Boussoura (CNSHB), Guinea Amadeu Almeida --- Centro de Investigaç ão Pesqueira Aplicada (CIPA), Guinea-Bissau Ebou Mass Mbye --- Fisheries Department, The GambiaSeventeen confirmed and four probable sightings of humpback whales, Megaptera novaeangliae, were documented from platform-of-opportunity Research Vessel (R/V) Dr. Fridtjof Nansen in a passing-mode visual survey of continental shelf waters between Conakry and Cap Vert Peninsula (Dakar), 21 October -5... -
Annual cycle of the upper-ocean circulation and properties in the tropical western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Manyilizu --- Department of Oceanography, South Africa P Penven --- Ifremer, Univ. Brest, CNRS, IRD, Laboratoire dʹOcéanographie Physique et Spatiale (LOPS), France CJC Reason --- Department of Oceanography, South AfricaA regional ocean model was used to simulate the annual cycle of the upper-ocean dynamics and its influence on ocean properties in the tropical western Indian Ocean. Surface winds and heat fluxes from the National Centers for Environmental Prediction (NCEP)... -
Distribution and feeding modes of macrobenthos within three oceanographic feature areas of the KwaZulu-Natal Bight, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CB Untiedt --- Oceanographic Research Institute, South Africa CF MacKay --- Oceanographic Research Institute, South AfricaThe composition and distribution of macrobenthic communities was investigated in three areas in the KwaZulu- Natal Bight, a section of shelf off the east coast of South Africa. Areas were pre-selected on the basis of three known oceanographic features, posited... -
Unconsolidated sediment distribution patterns in the KwaZulu-Natal Bight, South Africa: the role of wave ravinement in separating relict versus active sediment populations
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AN Green --- Geological Sciences, School of Agricultural, Earth and Environmental Sciences, South Africa CF MacKay --- Oceanographic Research Institute, South AfricaThis paper examines the distribution of unconsolidated sediment in the KwaZulu-Natal Bight located along the east coast of South Africa. Results show that there is a general shelf-wide sediment distribution of coarser grain sizes between depths of 60 and 100 m,... -
Classification of marine bioregions on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T-C Livingstone --- Ezemvelo KZN Wildlife, South Africa JM Harris --- Ezemvelo KZN Wildlife, South Africa AT Lombard --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa AJ Smit --- Department of Biodiversity and Conservation Biology, South Africa DS Schoeman --- School of Science and Engineering, AustraliaMarine bioregional planning requires a meaningful classification and spatial delineation of the ocean environment using biological and physical characteristics. The relative inaccessibility of much of the ocean and the paucity of directly measured data spanning entire planning regions mean that... -
Shelf-life characteristics of Bambara groundnut (Vigna subterranea (L.)Verdc) probiotic beverage
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Yvonne Yeukai Murevanhema --- , South Africa Victoria Adaora Jideani --- , South AfricaTwo Bambara groundnut probiotic beverages (BGNPB), fermented with (1) Lactobacillus bulgaricus and (2) Lactobacillus bulgaricus and Lactobacillus plantarum were assessed for their shelf-life characteristics. During the shelf-life study, sampling of the BGNPB was done at two-days interval for 28 days... -
Demersal fish communities in KwaZulu-Natal, South Africa, indicate partial congruence with proposed conservation biozones
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: WN Dalton --- , South Africa SN Porter --- , South Africa T-C Livingstone --- , South Africa BQ Mann --- , South AfricaThe KwaZulu-Natal shelf, on the east coast of South Africa, is inhabited by diverse communities of demersal fishes; however, previous studies deeper than 30 m have largely investigated these with extractive techniques. Using baited remote underwater videos (BRUVs), this study... -
Comparison of the particle size distributions of sediment collected from sandy seafloor using a Van Veen grab and cone dredge
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM van der Heever --- , South Africa LJ Atkinson --- , South Africa CEO von der Meden --- , South AfricaSediment particle size is an important environmental parameter that influences benthic species composition and is frequently used in habitat and ecosystem classification systems. In South Africa, benthic grabs are regularly used to collect seafloor sediment samples for particle size analysis...