Articles by Keyword: Demographic Parameters

Search results for Demographic Parameters

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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. A survey of grazed and ungrazed grassland in the south‐eastern Transvaal highveld 2. Potential floristic composition and patterns of degradation

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The floristic composition of selected veld communities which, by virtue of their location were ungrazed but regularly burned, and which were judged to reflect potential floristic composition, was measured at 112 sites in the southeastern Transvaal highveld. Relevant environmental parameters...
  3. Soils derived from granite in two Mt. Garnet toposequences, North Queensland, Australia

    Soils derived from granite in two Mt. Garnet toposequences, North Queensland, Australia

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Two toposequences derived from granite in the Mt. Garnet area, North Queensland, were examined to determine the detailed soil - landform relationships in order to facilitate subsequent broad-scale mapping of the soil resource. The dominant landsurface feature is gently sloping,...
  4. Evaluering en kalibrering van CERES-Maize. 1. Nie-lineêre regressie om genetiese parameters te bepaal

    Evaluering en kalibrering van CERES-Maize. 1. Nie-lineêre regressie om genetiese parameters te bepaal

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Die genetiese parameters van die meeste plaaslike mielie cultivars wat as inset van CERES-Maize benodig word, is nog nie bepaal nie. Sodanige parameters kan met behulp van bestaande oesdata en fenologiese datums, uit veldproewe afgelei word. Programmatuur kan gebruik word...
  5. Use of chlorophyll <em>a</em> fluorescence in screening for herbicide susceptibility in several <em>Nicotiana tabacum</em> L. cultivars and breeding lines

    Use of chlorophyll <em>a</em> fluorescence in screening for herbicide susceptibility in several <em>Nicotiana tabacum</em> L. cultivars and breeding lines

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Possible differential sensitivity of newly released tobacco cultivars to different herbicides must be determined, as possible unfavourable combinations could exist which may have large financial implications in terms of cultivars bred, herbicide and tobacco line combinations used, and concentrations in...
  6. Genotype-environment interactions and yield stability analyses of maize in Ethiopia

    Genotype-environment interactions and yield stability analyses of maize in Ethiopia

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The objective of this study was to evaluate the adaptation of 10 maize genotypes across five locations and three years in Ethiopia. Grain yield of 10 maize genotypes, tested in a randomised block design with four replications across the named...
  7. Relationships between plant and soil nutrient status and position in the landscape on Pellic Vertisols of Ethiopia

    Relationships between plant and soil nutrient status and position in the landscape on Pellic Vertisols of Ethiopia

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Effects of land use on soil nutrients and related soil parameters of Pellic Vertisols were assessed using soil samples collected from plots subjected to the cultivation of tef (Eragrostis tef) (TF) and grass pea (Lathyrus sativus) (GP) and native grassland...
  8. Obtaining the parameters required to model labile phosphorus for South African soils

    Obtaining the parameters required to model labile phosphorus for South African soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Modelling phosphorus (P) in the environment can increase our understanding of potential transfer pathways into receiving water bodies as well as the plant availability of this nutrient in soil. Many current models make use of algorithms originally developed for the...
  9. Family selection gains for quality traits among South African sugarcane breeding populations

    Family selection gains for quality traits among South African sugarcane breeding populations

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    In sugarcane breeding, family selection has been shown to produce larger gains than individual plant selection. During family selection, whole families of seedlings are selected or rejected based on data derived from replicated family plots. The objective of this study...
  10. Changes in some key biological parameters of the northern Benguela sardine stock

    Changes in some key biological parameters of the northern Benguela sardine stock

    Item type: Journal Article • Journal: South African Journal of Marine Science
    During the past 50 years, more than 15 million tons of sardine have been harvested from the northern Benguela ecosystem. The sardine population has undergone changes in abundance estimated to range over more than two orders of magnitude, but for...