Articles by Keyword: Closed Population Model

Search results for Closed Population Model

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  1. Abundance estimates of an isolated population of common bottlenose dolphins <em>Tursiops truncatus</em> in Walvis Bay, Namibia, 2008–2012

    Abundance estimates of an isolated population of common bottlenose dolphins <em>Tursiops truncatus</em> in Walvis Bay, Namibia, 2008–2012

    Item type: Journal Article • Journal: African Journal of Marine Science
    The coastal population of common bottlenose dolphins Tursiops truncatus found in Namibia is regionally isolated and unique. This population faces several potential anthropogenic threats, especially in Walvis Bay, including boat-based tourism, a commercial harbour undergoing expansion, and aquaculture for oysters...
  2. Refinement and validation of the PUTU wheat crop growth model 2. Leaf area expansion

    Refinement and validation of the PUTU wheat crop growth model 2. Leaf area expansion

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    A refined leaf growth submodel was incorporated in an existing wheat crop growth model. The submodel calculated daily green leaf area expansion per plant by taking into account plant population, crop age, interplant competition, temperature and crop water status. After...
  3. Response of mangroves to drought and non-tidal conditions in St Lucia Estuary, South Africa

    Response of mangroves to drought and non-tidal conditions in St Lucia Estuary, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The effect of a prolonged closed-mouth state on the condition of mangrove habitats was studied in May 2010 at St Lucia Estuary, KwaZulu-Natal. The mouth had been closed to the sea since 2002 as a result of artificial mouth closure...
  4. Geostatistical modelling of the spatial life history of post-larval deepwater hake <em>Merluccius paradoxus</em> in the Benguela Current Large Marine Ecosystem

    Geostatistical modelling of the spatial life history of post-larval deepwater hake <em>Merluccius paradoxus</em> in the Benguela Current Large Marine Ecosystem

    Item type: Journal Article • Journal: African Journal of Marine Science
    Optimal and sustainable management of fish resources cannot be ensured without a thorough understanding of the migration patterns and population (demographic stock) structure. Recent studies suggest that these aspects of the economically and ecologically important deepwater hake Merluccius paradoxus are...
  5. Survival estimates for the greater crested tern <em>Thalasseus bergii</em> in southern Africa

    Survival estimates for the greater crested tern <em>Thalasseus bergii</em> in southern Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    The nominate race of the greater crested tern Thalasseus bergii breeds only along the coast of the Benguela region (west coast) of southern Africa, where its population is increasing, in contrast to other species of breeding seabirds in the region...
  6. Mathematical model showing how socioeconomic dynamics in African cities could widen or reduce inequality

    Mathematical model showing how socioeconomic dynamics in African cities could widen or reduce inequality

    Cities are important forces of national socioeconomic development. Individuals in cities often belong to different socioeconomic statuses depending on their levels of income, education and nature of occupation. Income, employment and education opportunities are among the main attractions of most...
  7. A model for predicting long term economic optimum stocking rates for beef cattle grazing dryland pastures

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Previous models relating profit to stocking rate have not taken into account annual variation in rainfall. A model is developed here to allow for this factor. The frequency distribution of annual rainfall is used to demonstrate how the stocking rate...
  8. Die wiskundige simulering van koolhidraattranslokasie in natuurlike grasveld<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Die groeifunksies benodig vir die simulasie van produksie van ‘n Themeda triandra‐grasveld met behulp van die PUTU 11 simulasiemodel is ontwikkel. Vir die ontwikkeling van die model is die veldproduksiedata van die 1980/81 groeiseisoen gebruik waarna dit suksesvol, vir drie...
  9. Simulating browse production and response of <em>Acacia karroo</em> to defoliation I. Model description and sensitivity analyses

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The model is aimed at synthesizing existing data to enhance the understanding of this data and explore the consequences of possible browse management strategies. It gives a good reproduction of the shoot and leaf growth responses used to develop it...
  10. Simulating browse production and response of <em>Acacia karroo</em> to defoliation II. Evaluation of browse management systems and strategies

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    To assess management implications, a model was used to simulate the response of Acacia karroo to a wide range of different climatic patterns and defoliation regimes. The model predicts that if poor growing conditions initiate growth later in spring than...