Articles by Keyword: Wasp Waist Ecosystem

Search results for Wasp Waist Ecosystem

We found 82 results for you
  1. Modelling stock dynamics in the southern Benguela ecosystem for the period 1978–2002

    Modelling stock dynamics in the southern Benguela ecosystem for the period 1978–2002

    Item type: Journal Article • Journal: African Journal of Marine Science
    An ecosystem model of the southern Benguela was fitted to available time-series data for the period 1978–2002, to explore how changes in target fish populations in this ecosystem can be attributed to feeding interaction terms and population control patterns, the...
  2. Predatory pelagic fishes of the Bijagós Archipelago (Guinea-Bissau) show high overlap in diets dominated by sardinella

    Predatory pelagic fishes of the Bijagós Archipelago (Guinea-Bissau) show high overlap in diets dominated by sardinella

    Item type: Journal Article • Journal: African Journal of Marine Science
    Knowledge of trophic interactions between the key components of marine communities is required to understand food-web dynamics and develop ecosystem-based management approaches. In West Africa, where fisheries sustain the livelihoods of a significant part of the human population, this understanding...
  3. A RULE-BASED ECOSYSTEM MODEL FOR THE MANAGEMENT OF LAKE ST LUCIA

    A RULE-BASED ECOSYSTEM MODEL FOR THE MANAGEMENT OF LAKE ST LUCIA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Land transformations in the catchments of Lake St Lucia have altered the hydrology of the system and increased management is now needed to counteract these changes. There are several management options available, but prior to implementing them we must be...
  4. FURTHER COMMENT ON THE RESPONSE OF EASTERN CAPE PROVINCE ESTUARIES TO VARIABLE FRESHWATER INFLOWS

    FURTHER COMMENT ON THE RESPONSE OF EASTERN CAPE PROVINCE ESTUARIES TO VARIABLE FRESHWATER INFLOWS

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    River flow patterns in the Kariega, Great Fish and Keiskamma estuaries, South Africa are examined to assess the impact variation in flow has upon the delivery of inorganic nutrients, total organic carbon, primary productivity and the heterotrophic components, bacteria and...
  5. Production and decomposition of plant litter in an arid rangeland of Kenya

    Production and decomposition of plant litter in an arid rangeland of Kenya

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Data on litter production and decomposition in an arid rangeland in Kenya was collected over a two-year period. Utter sampling was carried out at monthly intervals using a rectangular 0.25m−2 quadrat frame. Utter within the quadrats was handpicked and washed...
  6. Lines around fragments: effects of fencing on large herbivores

    Lines around fragments: effects of fencing on large herbivores

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    People construct fences to delineate land ownership and to control access to land. Fences accomplish several purposes, notable among these are containing livestock or wildlife raised for profit or subsistence, excluding use of vegetation within areas to be conserved and...
  7. Community dynamics and phytomass of herbaceous species in the Sudaniansavanna-woodlands of Burkina Faso: short-term impact of burning season

    Community dynamics and phytomass of herbaceous species in the Sudaniansavanna-woodlands of Burkina Faso: short-term impact of burning season

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Fire is important for the maintenance and conservation of African savanna ecosystems, and prescribed fire is used in the Sudanian savanna-woodlands of West Africa as a forest management tool. Yet, the effects of fire on savanna ecosystems and especially on...
  8. The impact of dredging on macrobenthic invertebrates in a tributary of the Warri River, Niger delta

    The impact of dredging on macrobenthic invertebrates in a tributary of the Warri River, Niger delta

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The macrobenthic invertebrates of a canal, created from a tributary of the Warri River in the mangrove swamp of the Niger Delta, Nigeria, were studied before and after dredging. In the canal dredging resulted in at least a 93% decrease...
  9. Water quality impacts on instream biota of the Shingwedzi River, South Africa

    Water quality impacts on instream biota of the Shingwedzi River, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Water quality, macroinvertebrate diversity (using SASS5) and fish diversity (using the fish response assessment index) of the Shingwedzi River system were monitored in 2007/2008 to determine the present status of the system. Possible water pollution sources were identified by aerial...
  10. Zooplankton abundance and composition in the hypertrophic Rietvlei Dam, South Africa, negate prospects for its remedial ‘top-down’ biomanipulation

    Zooplankton abundance and composition in the hypertrophic Rietvlei Dam, South Africa, negate prospects for its remedial ‘top-down’ biomanipulation

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Crustacean zooplankton abundance and composition were determined at one offshore and three nearshore sites in the hypertrophic Rietvlei Dam on 19 dates between July 2009 and December 2011. Total biomass fluctuated seasonally, generally declining from spring to winter through the...