Search
Search results for
We found
27 results for you
-
Assessment of resource availability and suitability for subsistence fishers in South Africa, with a review of resource management procedures
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: A. C. Cockcroft W. H. H. Sauer G. M. Branch B. M. Clark A. H. Dye E. RussellThe availability of resources and their suitability for subsistence and small-scale commercial fishers in South Africa were assessed and appropriate options for the management of resources recommended. Assessment of current resource utilization and recommendations for future subsistence and/or small-scale commercial... -
A comparison between fish assemblages in mangrove forests and on intertidal flats at Ungwana Bay, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DO Mirera --- , Kenya JG Kairo --- , Kenya EN Kimani --- , Kenya FK Waweru --- , KenyaFish assemblages of mangrove forest patches and adjacent intertidal flats in Ungwana Bay were compared using stake-net sampling in the mangrove forest and intertidal flat habitats between December 2002 and November 2003. Four forest sites were compared with paired intertidal... -
Biogeographic patterns in rocky intertidal communities in KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KJ Sink GM Branch JM HarrisOn the east coast of southern Africa, marine biogeographic boundaries have previously been unresolved. This paper analyses large-scale patterns of community structure of rocky intertidal shores along the whole of the KwaZulu-Natal coast, based on abundance data covering 220 macroalgal... -
Patterns of diversity along experimental gradients of disturbance and nutrient supply—the confounding assumptions of the Intermediate Disturbance Hypothesis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MC Pfaff --- Department of Zoology, South Africa C Hiebenthal --- , Germany M Molis --- , Germany GM Branch --- Department of Zoology, South Africa M Wahl --- , GermanyA model of the interactive effects of disturbance and productivity on diversity predicts peak diversity to shift towards higher disturbance regimes as productivity increases, confining the Intermediate Disturbance Hypothesis to intermediate productivity levels. We conducted a two-factorial (disturbance, nutrients) field... -
A significant and unappreciated intertidal mytiloidean genus: the biology and functional morphology of Brachidontes puniceus (Bivalvia: Mytilidae) from the Cape Verde Islands
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Brian Morton --- Department of Zoology, UKBrachidontes puniceus (Gmelin 1791) occurs on all the islands of the Cape Verde Archipelago and along the West African coast from Mauritania to Ghana. The species is morphologically, in terms of its acutely heteromyarian form, strong byssal attachment, stout ligament,... -
Plant traits and spread of the invasive salt marsh grass, Spartina alterniflora Loisel., in the Great Brak Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JB Adams --- Department of Botany, South Africa A Grobler --- Department of Botany, South Africa C Rowe --- Department of Botany, South Africa T Riddin --- Department of Botany, South Africa TG Bornman --- , South Africa DR Ayres --- Evolution and Ecology, USASpartina alterniflora Loisel., widely recognised as an aggressive invader of estuaries and salt marshes around the world, was discovered growing in the temporarily open/closed Great Brak Estuary on the southern Cape coast of South Africa in 2004. This is the... -
Epiphytic seaweeds and invertebrates associated with South African populations of the rocky shore seagrass Thalassodendron leptocaule — a hidden wealth of biodiversity
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CM Browne --- Department of Biological Sciences and Marine Research Institute, South Africa R Milne --- Department of Biological Sciences and Marine Research Institute, South Africa C Griffiths --- Department of Biological Sciences and Marine Research Institute, South Africa JJ Bolton --- Department of Biological Sciences and Marine Research Institute, South Africa RJ Anderson --- Department of Biological Sciences and Marine Research Institute, South AfricaSeagrasses support a great diversity of epiphytic organisms. There are no detailed published accounts of algae and animals growing on seagrasses in South Africa. The seagrass Thalassodendron leptocaule (previously known as Thalassodendron ciliatum) is unique among southern African seagrasses in... -
Further refutation of the primary-secondary settlement hypothesis for the brown mussel Perna perna
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: KE Reaugh JM Harris GM BranchThe primary-secondary settlement hypothesis, that mussels first settle in algae and then move to mussel beds, was rejected as the only mode of recruitment for the brown mussel Perna perna in a previous study at one location over one year... -
Marine reserve effects on population density and size structure of commonly and rarely exploited limpets in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MDV Nakin --- Walter Sisulu University, South Africa CD McQuaid --- Coastal Research Group, Department of Zoology and Entomology, South AfricaMarine reserves are commonly used to conserve living resources, but their effectiveness where policing is difficult is unclear. We compared monthly population density and size structure data collected over 20 months for two rarely and two commonly exploited intertidal limpets... -
Intertidal population structure of the edible mollusc Turbo sarmaticus (Vetigastropoda) at an unexploited and exploited sites along the coast of the Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: G.G. Foster --- Department of Zoology & Entomology, South Africa A.N. Hodgson --- Department of Zoology & Entomology, South AfricaThe intertidal population structure of the large edible gastropod Turbo sarmaticus was examined at four sites along the Eastern Cape Province of South Africa. One site was free from exploitation, two were subjected to low levels of exploitationand one was... -
Diversity of benthic macrofauna of the flood-tidal delta of the Nahoon Estuary and adjacent beach,South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Mary Bursey --- East London Museum, South Africa Tris Wooldridge --- Zoology Department, South AfricaMacrobenthos of the Nahoon estuarine flood-tidal delta was surveyed to determine species composition, distribution and abundance; establish possible patterns in community structure and compare assemblages with those of adjacent sandy beach and lower estuary. Macrozoobenthos retained by a 1 mm... -
Distribution patterns of the ghost crab Ocypode cursor on sandy beaches of a tropical island in the Cabo Verde archipelago, Eastern Central Atlantic
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Rodrigues --- Departamento de Engenharias e Ciências do Mar, R Freitas --- Departamento de Engenharias e Ciências do Mar, N de C Delgado --- Direcção Geral dos Recursos Marinhos, A Soares-Gomes --- Sediment Ecology Laboratory, Marine Biology Department, BrazilThe spatial distribution of the ghost crab Ocypode cursor was determined for beaches on eastern Boa Vista Island, Cabo Verde Archipelago. The main objectives were to analyse the across-shore distribution by means of burrow counts and to identify preferential zones... -
Boulder shores in South Africa – a distinct but poorly documented coastal habitat type
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Tucker --- Marine Research Institute and Department of Biological Sciences, South Africa CL Griffiths --- Marine Research Institute and Department of Biological Sciences, South Africa F Schroeter --- Marine Research Institute and Department of Biological Sciences, South Africa HD Vetter --- Marine Research Institute and Department of Biological Sciences, South AfricaThis study compares the composition, species richness and biomass of macrofaunal and algal assemblages on intertidal boulder shores as compared with those on adjacent rock-platforms, at six sites along the southwest coast of South Africa. Of 214 species identified, 175... -
Reassessing the invasion of South African waters by the European shore-crab Carcinus maenas
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CA Mabin --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa JRU Wilson --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa JJ Le Roux --- Centre for Invasion Biology, Department of Botany and Zoology, South Africa TB Robinson --- Centre for Invasion Biology, Department of Botany and Zoology, South AfricaThe European shore-crab Carcinus maenas has been present in South Africa since 1983. Despite this species’ international reputation as a biological invader, its distribution in this region has only been considered by three outdated ‘snapshot surveys.’ The present study is... -
Presence of microplastics in the tube structure of the reef-building polychaete Gunnarea gaimardi (Quatrefages 1848)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HA Nel --- Department of Zoology and Entomology, South Africa PW Froneman --- Department of Zoology and Entomology, South AfricaThe prevalence of microplastics in the marine environment has resulted in a need to understand their association with various fauna. The aim of this study was to assess whether microplastic particles are present in the tube structure of the indigenous... -
The subtropical–temperate transition along the east coast of South Africa shapes the thermal physiology of the truncated mangrove snail Cerithidea decollata (Gastropoda: Caenogastropoda, Potamididae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AS Nonyukela --- Department of Zoology and Entomology, South Africa S Baldanzi --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa LU Vumazonke --- Department of Zoology and Entomology, South AfricaThe east and south coasts of South Africa are characterised by a transition from subtropical to warm-temperate conditions. This transition in environmental temperatures may shape the physiological tolerance of ectothermic species inhabiting harsh environments, such as the intertidal zone. A... -
Foraging behaviour of wintering shorebirds at Merja Zerga lagoon (Atlantic coast, Morocco)
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Feirouz Touhami --- , Morocco Hamid Rguibi Idrissi --- , Morocco Abdelaziz Benhoussa --- , MoroccoThis paper presents the results of a comparative study on the foraging behaviour of 15 species of wintering shorebirds at Merja Zerga lagoon. We video recorded a total of 600 actively foraging birds at the intertidal mudflats of the lagoon... -
Heavy metal profiles in limpets and algae on the Eastern Cape coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Mbandzi --- , South Africa MDV Nakin --- , South Africa GM Saibu --- , South Africa AO Oyedeji --- , South AfricaHeavy metal pollution is an increasing threat to the marine environment and is a major health concern. Both marine limpets and algae have been employed as biomonitors elsewhere in the world, but there are few or no data for these... -
Microplastics pollution in the sediments of creeks and estuaries of Kenya, western Indian Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JO Kerubo --- , Kenya AWN Muthumbi --- , Kenya JM Onyari --- , Kenya D Robertson-Andersson --- , South Africa E Kimani --- , KenyaMicroplastic pollution has been recognised as a global threat in marine environments and a danger to prey, predators and humans. Yet, there have been few studies in the western Indian Ocean, specifically along the Kenyan coast, which makes it difficult... -
Temperature cycles beneath, and adjacent to, intertidal boulders and associated differences in biotic composition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C van Rensburg --- , South Africa A Robbins --- , South Africa C Griffiths --- , South AfricaThe only previous study on the macrobiota of South African boulder shores showed this assemblage to be more diverse than on nearby rocky platforms, but the drivers of that difference remain unresolved. We recorded water and air temperatures under intertidal... -
Tidal influence on fish faunal occurrence and distribution in an estuarine mangrove system in Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NK Asare --- , Ghana JL Javier --- , United StatesThis study assessed the effects of tidal stages and habitat conditions on nekton assemblage and distribution in the Kakum River estuarine mangrove system in the Central Region of Ghana. Teleosts and crustaceans were sampled using pole seine and cast net... -
Comparisons of macrofaunal communities occupying shores across the full particle-size spectrum reveals pebble beaches to be a distinct coastal habitat type
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Robbins --- University of Cape Town, South Africa CL Griffiths --- University of Cape Town, South Africa L Nefdt --- University of Cape Town, South AfricaIntertidal research has focused primarily on very fine to coarse sandy beaches (grain size <1 mm) and on rocky shores, while shores with grain sizes of 1-256+ mm have rarely been studied. Within South Africa, few published accounts describe the... -
Patterns of fish distribution in tropical rock pools at Príncipe Island, Gulf of Guinea
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: J Azevedo e Silva --- University of Lisbon, Portugal AJ Almeida --- University of Lisbon, Portugal M Cravo --- University of Lisbon, Portugal MP Pais --- University of Lisbon, Portugal Y Santos --- , São Tomé e Príncipe J Paula --- University of Lisbon, PortugalLittle is known about the ichthyofauna from intertidal rock pools of the west coast of Africa, especially in the Gulf of Guinea. Rock pools are characteristic habitats of the intertidal zone of structurally complex rocky shores, adding important niche space... -
Effect of rotational harvesting on the size composition of Cape rock oysters Striostrea margaritacea on the east coast of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Steyn --- Oceanographic Research Institute, South Africa JC Groeneveld --- Oceanographic Research Institute, South Africa J Santos --- Norwegian College of Fishery Science, Uit – The Arctic University of Norway, NorwayA commercial fishery for the Cape rock oyster Striostrea margaritacea along the north coast of KwaZulu-Natal, South Africa (western Indian Ocean), follows a 4-year rotational cycle, with each harvest year followed by 3 fallow years across four harvest zones. We... -
Variations in the heart rate of Mediterranean mussels Mytilus galloprovincialis and brown mussels Perna perna under thermal stress on rocky shores of South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: K Beine --- University of Johannesburg, South Africa LJ Connell --- University of Johannesburg, South Africa R Greenfield --- University of Johannesburg, South AfricaIntertidal mussels experience prolonged emersion during low tide, followed by rapid submergence cooling during high tide, causing temperature-induced stress responses. This study examined variations in heart rate to investigate the relationship between emerged and submerged thermal stress in Mediterranean mussels... -
Life-history strategy and intertidal distribution in sympatric species of pulmonate limpets of the genus Siphonaria
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: CD McQuaid --- Rhodes University, South Africa RJ Chambers --- Rhodes University, South AfricaThree species of the intertidal pulmonate limpet genus Siphonaria are sympatric on the south coast of South Africa and all lay gelatinous benthic egg masses. Siphonaria capensis and S. concinna hatch as planktonic larvae, whereas S. serrata has direct-developing larvae... -
Physico-chemical variables influencing the distribution and abundance of macroinvertebrates in salt marsh habitats of the Berg River Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: NT Mngomezulu --- Department of Plant Sciences, University of the Free State, South Africa N Peer --- Department of Botany and Zoology, Stellenbosch University, South Africa A Rajkaran --- Department of Biodiversity and Conservation Biology, University of the Western Cape, South Africa DA Veldkornet --- Department of Plant Sciences, University of the Free State, South AfricaMacroinvertebrates such as snails and crabs influence aspects of salt marsh structure and function through herbivory and bioturbation. However, the effects of physico-chemical variables and habitat composition on their abundance and distribution remain underexplored. This study examined the influence of...