Articles by Keyword: Marine Ecosystem

Search results for Marine Ecosystem

We found 194 results for you
  1. St Helena Bay (southern Benguela) then and now: muted climate signals, large human impact

    St Helena Bay (southern Benguela) then and now: muted climate signals, large human impact

    Item type: Journal Article • Journal: African Journal of Marine Science
    The development of suitable reference states for ecosystem-based management requires documentation of changes in structure and functioning of marine ecosystems, including assessment of the relative importance of bottom-up and top-down processes as drivers of change. We used monitoring data available...
  2. Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

    Do inter-colony differences in Cape fur seal foraging behaviour reflect large-scale changes in the northern Benguela ecosystem?

    Item type: Journal Article • Journal: African Journal of Marine Science
    The northern Benguela ecosystem adjoining Namibia has undergone considerable changes in recent decades, with reductions and northwards shifts of key prey species that have had severe implications for marine top predator populations. We investigated how such environmental variability may impact...
  3. Spatial characterisation of the Benguela ecosystem for ecosystem-based management

    Spatial characterisation of the Benguela ecosystem for ecosystem-based management

    Item type: Journal Article • Journal: African Journal of Marine Science
    The three countries of the Benguela Current Large Marine Ecosystem (BCLME), namely Angola, Namibia and South Africa, have committed to implementing ecosystem-based management (EBM) including an ecosystem approach to fisheries (EAF) in the region, to put in practice the principles...
  4. Structure and dynamics of demersal fish assemblages over three decades (1985–2012) of increasing fishing pressure in Guinea

    Structure and dynamics of demersal fish assemblages over three decades (1985–2012) of increasing fishing pressure in Guinea

    Item type: Journal Article • Journal: African Journal of Marine Science
    In a context of growing fishing pressures and recommendations for an ecosystem approach to fisheries, there is a need to monitor changes in fish communities over time. In this study, we analysed data from scientific trawl surveys carried out on...
  5. Presence of microplastics in the tube structure of the reef-building polychaete <em>Gunnarea gaimardi</em> (Quatrefages 1848)

    Presence of microplastics in the tube structure of the reef-building polychaete <em>Gunnarea gaimardi</em> (Quatrefages 1848)

    Item type: Journal Article • Journal: African Journal of Marine Science
    The 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...
  6. Spatial considerations when monitoring reef fishes

    Spatial considerations when monitoring reef fishes

    Item type: Journal Article • Journal: African Journal of Marine Science
    Spatial dependence can obscure relationships between response and explanatory variables because of structuring within the residuals reducing variance and biasing coefficient estimates. Here, we highlight the influence of the spatial component, in the presence of spatial dependence, on abundance trends...
  7. Protected nearshore shallow and deep subtidal rocky reef communities differ in their trophic diversity but not their nutritional condition

    Protected nearshore shallow and deep subtidal rocky reef communities differ in their trophic diversity but not their nutritional condition

    Item type: Journal Article • Journal: African Journal of Marine Science
    Large physical changes that alter reef macrobenthos and fish assemblages occur with increasing depth, so the biological processes that regulate communities at different depths are expected to diverge. We used analyses of stable isotopes (δ13C and δ15N) and fatty acids...
  8. An overview of the living marine resources of Namibia

    An overview of the living marine resources of Namibia

    Item type: Journal Article • Journal: South African Journal of Marine Science
    This paper gives an overview of the main living marine resources of Namibia. It focuses on the scientific research conducted during the past decade as input to the management of these resources. The distribution and habitats of the most important...
  9. Entanglement of pinnipeds at Marion Island

    Entanglement of pinnipeds at Marion Island

    Item type: Journal Article • Journal: South African Journal of Marine Science
    During the period April 1991–March 1996, 10 entangled Antarctic fur seals Arctocephalus gazella, 28 entangled Subantarctic fur seals A. tropicalis and one entangled southern elephant seal Mirounga leonina were observed at Marion Island, Southern Ocean. Entanglement of fur seals was...
  10. Movement patterns of red steenbras <em>Petrus rupestris</em> tagged and released in the Tsitsikamma National Park, South Africa

    Movement patterns of red steenbras <em>Petrus rupestris</em> tagged and released in the Tsitsikamma National Park, South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Movement patterns of red steenbras Petrus rupestris were obtained from fish tagged and released in the Tsitsikamma National Park, South Africa. Of 217 fish tagged, 38 were recaptured. Juveniles (<700 mm FL) were resident, whereas adults (>700 mm FL) migrated...