Articles by Author: Ja Huggett

Search results for Ja Huggett

We found 10 results for you
  1. The effects of entrainment on plankton at Koeberg nuclear power station

    The effects of entrainment on plankton at Koeberg nuclear power station

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The plankton community entrained in seawater used for cooling at Koeberg Nuclear Power Station was studied to determine the effects of short-term exposure to heat, chlorine and physical stress on plankton survival and productivity. Field-based studies conducted between September 1985...
  2. Anchovy spawning in relation to the biomass and the replenishment rate of their copepod prey on the western Agulhas Bank

    Anchovy spawning in relation to the biomass and the replenishment rate of their copepod prey on the western Agulhas Bank

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Anchovy biomass and copepod standing stocks and growth rates on the Agulhas Bank were compared during the peak spawning period (November) in 1988 and 1989. In 1988, copepod biomass over the western Agulhas Bank was low (1,0 g dry mass·m−2)...
  3. Mesozooplankton dynamics in the Benguela ecosystem, with emphasis on the herbivorous copepods

    Mesozooplankton dynamics in the Benguela ecosystem, with emphasis on the herbivorous copepods

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Recent research developments on the ecology, dynamics and trophic position of copepods in the Benguela ecosystem are synthesized. Attention is focused on herbivorous species of the southern Benguela and how they cope with the physical and biological variability characteristic of...
  4. Weekly variability of clupeoid eggs and larvae in the Benguela jet current: implications for recruitment

    Weekly variability of clupeoid eggs and larvae in the Benguela jet current: implications for recruitment

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Weekly sampling of ichthyoplankton, current vectors and surface temperature along a 34-mile transect crossing the jet current off the Cape Peninsula was conducted from August 1995 to July 1996 as part of the third phase of the South African Sardine...
  5. Multiple factors affecting South African anchovy recruitment in the spawning, transport and nursery areas

    Multiple factors affecting South African anchovy recruitment in the spawning, transport and nursery areas

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Despite high primary productivity, the yield of pelagic fish in the southern Benguela is relatively low compared to that in the Humboldt system. Part of the constraint may be the ability of pelagic fish to reproduce successfully in a strongly...
  6. Comparative ecology of the copepods <em>Calanoides carinatus</em> and <em>Calanus agulhensis</em> — the influence of temperature and food

    Comparative ecology of the copepods <em>Calanoides carinatus</em> and <em>Calanus agulhensis</em> — the influence of temperature and food

    Item type: Journal Article • Journal: African Journal of Marine Science
    Hypotheses regarding temperature, food abundance and food size were tested to explore niche separation between Calanoides carinatus, an abundant copepod in the cool and food-rich southern Benguela upwelling system, and Calanus agulhensis, the dominant copepod on the warmer, relatively food-poor...
  7. 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...
  8. Summer and winter differences in zooplankton biomass, distribution and size composition in the KwaZulu-Natal Bight, South Africa

    Summer and winter differences in zooplankton biomass, distribution and size composition in the KwaZulu-Natal Bight, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Zooplankton biomass and distribution in the KwaZulu-Natal Bight were investigated in relation to environmental parameters during summer (January–February 2010) and winter (July–August 2010). Mean zooplankton biomass was significantly higher in winter (17.1 mg dry weight [DW] m–3) than in summer...
  9. Riverine influence determines nearshore heterogeneity of nutrient (C, N, P) content and stoichiometry in the KwaZulu-Natal Bight, South Africa

    Riverine influence determines nearshore heterogeneity of nutrient (C, N, P) content and stoichiometry in the KwaZulu-Natal Bight, South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Riverine influences on nearshore oceanic habitats often have detrimental consequences leading to algal blooms and hypoxia. In oligo- to mesotrophic systems, however, nutrient delivery via rivers may stimulate production and even be a vital source of nutrients, as may nutrient...
  10. The ‘suitcase hypothesis’: Can entrainment of meroplankton by eddies provide a pathway for gene flow between Madagascar and KwaZulu-Natal, South Africa?

    The ‘suitcase hypothesis’: Can entrainment of meroplankton by eddies provide a pathway for gene flow between Madagascar and KwaZulu-Natal, South Africa?

    Item type: Journal Article • Journal: African Journal of Marine Science
    Similarities in the marine fauna found off the coasts of southern Madagascar and KwaZulu-Natal Province (KZN), South Africa, led to the development of the ‘suitcase project,’ with the aim of establishing whether eddies that form off southern Madagascar may package...