Articles by Author: V Wepener

Search results for V Wepener

We found 28 results for you
  1. Recent population trends of African penguins <em>Spheniscus demersus</em> in Namibia

    Recent population trends of African penguins <em>Spheniscus demersus</em> in Namibia

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The African penguin Spheniscus demersus is endemic to southern Africa and is listed overall as "vulnerable". Over the past century, however, the Namibian population has been severely reduced and is currently listed as "critically endangered". Recent trends at Possession, Halifax,...
  2. DUNE MINING AND THE NHLABANE SYSTEM: CAN BIODIVERSITY AND THE NURSERY FUNCTION BE MAINTAINED?

    DUNE MINING AND THE NHLABANE SYSTEM: CAN BIODIVERSITY AND THE NURSERY FUNCTION BE MAINTAINED?

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    A four year study of the Nhlabane Estuary and Lake System was undertaken over the period 1992 to 1995. Data gathered clearly showed that in terms of ichthyofauna, the estuary plays an important role as a nursery ground for juveniles...
  3. COMMENTS ON THE WATER QUALITY OF THE MHLATHUZE ESTUARY IN RELATION TO DETERMINING THE ECOLOGICAL INTEGRITY CLASS

    COMMENTS ON THE WATER QUALITY OF THE MHLATHUZE ESTUARY IN RELATION TO DETERMINING THE ECOLOGICAL INTEGRITY CLASS

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Water quality forms an integral component of the determination of the Ecological Reserve of a water resource. This paper presents the available historical and current information on the water quality of the Mhlathuze estuary, The data were assessed in order...
  4. The sublethal effects of zinc at different water temperatures on selected haematological variables in <em>Oreochromis mossambicus</em>

    The sublethal effects of zinc at different water temperatures on selected haematological variables in <em>Oreochromis mossambicus</em>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Trace metals such as zinc play an important role in the normal metabolic functioning of all organisms. However, metals can become toxic if background concentrations are exceeded in the environment. This study investigated the sublethal effects of zinc on the...
  5. Comparison of the density and species composition of aquatic invertebrates found between the roots of <em>Eichhornia crassipes</em> plants from two coastal lakes in northern KwaZulu-Natal

    Comparison of the density and species composition of aquatic invertebrates found between the roots of <em>Eichhornia crassipes</em> plants from two coastal lakes in northern KwaZulu-Natal

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The aquatic invertebrates found between the roots of Eichhornia crassipes plants from Lakes Cubhu and Nsezi were analysed and compared with each other. Root samples in Lake Cubhu were dominated by Corophium triaenonyx and Caridina nilotica whilst root samples from...
  6. The sublethal effects of copper and lead on the haematology and acid-base balance of the groovy mullet, <em>Liza dumerili</em>

    The sublethal effects of copper and lead on the haematology and acid-base balance of the groovy mullet, <em>Liza dumerili</em>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Toxicity bioassays were conducted on groovy mullet, Liza dumerili, using copper and lead, in order to assess how these metals affected their blood haematology and acid-base balance. Short-term (96 hours) exposure to lead caused significantly more haematological response [PCO2] than...
  7. Bacterial levels in the Nyl River system, Limpopo province, South Africa

    Bacterial levels in the Nyl River system, Limpopo province, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Because water quantity and quality are of great importance in the arid Limpopo province, the bacterial content of water in the Nyl River System and its possible origins were assessed at five sites. Quarterly surveys took place between April 2001...