Articles by Keyword: Sampling

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We found 51 results for you
  1. A study of variations in floristic composition of highveld in the eastern Transvaal

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Floristic surveys of two 1500m line transects in veld provided data which indicated the nature of variations in veld composition, expressed in terms of species, palatability classes or weighted palatability classes. The transects were subjectively subdivided into units comprising relatively...
  2. Towards a plant‐based technique to measure utilization of karoo bushes

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The precision of various destructive techniques for estimating utilization of karoo bushes was investigated with the prerequisite that removal of 20 % of the edible material of individual species could be shown to be statistically significant. Where the total mass...
  3. Determining sample size for assessing species composition in grassland<sup>1</sup>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Species composition is measured in grasslands for a variety of reasons. Commonly, observations are made using the wheel‐point apparatus. However, the problem of determining optimum sample size has not yet been satisfactorily resolved. In this study the wheel‐point apparatus was...
  4. An investigation into soil fertility in two resource-poor farming communities in KwaZulu-Natal (South Africa)

    An investigation into soil fertility in two resource-poor farming communities in KwaZulu-Natal (South Africa)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Low soil fertility is one of the major constraints affecting agriculture in Africa, a phenomenon that is also evident in fields of resource-poor farmers in KwaZulu-Natal. However, nutrient depletion status is field specific. This paper investigates the hypothesis that among...
  5. Precision in systematic trawl surveys as assessed from replicate sampling by parallel trawling off Namibia

    Precision in systematic trawl surveys as assessed from replicate sampling by parallel trawling off Namibia

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Following independence of Namibia in 1990, abundance of that country's hake stocks was monitored by trawl surveys conducted by the Norwegian F.R.V. Dr Fridtjof Nansen using a systematic survey design. Precision from such designs is considered to be better than...
  6. Understanding self-appraisal of HIV-infection risk among young adults in Nigeria: evidence from a national survey

    Understanding self-appraisal of HIV-infection risk among young adults in Nigeria: evidence from a national survey

    Item type: Journal Article • Journal: African Journal of AIDS Research
    A major component of HIV prevention is to encourage individuals to appreciate their personal risk of contracting the virus with the aim of encouraging them to take steps to reduce the risks. This article addresses the accuracy of an individual's...
  7. Recommendations for the collection, preparation and enumeration of diatoms from riverine habitats for water quality monitoring in South Africa

    Recommendations for the collection, preparation and enumeration of diatoms from riverine habitats for water quality monitoring in South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Diatoms have become important organisms for monitoring freshwaters and their value has been recognised for cross-border water quality monitoring in the European Union. If South Africa is to include diatoms in the current suite of bioindicators, then thorough testing of...
  8. Towards the development of a macroinvertebrate sampling technique for palustrine wetlands in South Africa: a pilot investigation in the KwaZuluNatal midlands

    Towards the development of a macroinvertebrate sampling technique for palustrine wetlands in South Africa: a pilot investigation in the KwaZuluNatal midlands

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    A study was undertaken in November 2003 to derive a suitable sampling technique for collecting a representative sample of aquatic macroinvertebrates from a selected emergent vegetation biotope in a palustrine wetland, Melmoth Vlei, KwaZulu-Natal, South Africa. The aim was to...
  9. Testing the applicability of the SASS5 scoring procedure for assessing wetland health: a case study in the KwaZulu-Natal midlands, South Africa

    Testing the applicability of the SASS5 scoring procedure for assessing wetland health: a case study in the KwaZulu-Natal midlands, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    A study was undertaken between 29th January and 17th February 2004 to test the applicability of the South African Scoring System Version 5 (SASS5) scoring and calculation procedure in nutrient-enriched palustrine wetlands in the midlands of KwaZulu-Natal, South Africa. Four...
  10. Turnover patterns in fish versus macroinvertebrates — implications for conservation planning

    Turnover patterns in fish versus macroinvertebrates — implications for conservation planning

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Spatial patterns in taxonomic richness and turnover for fish and aquatic macroinvertebrates are compared to assess the relative usefulness of each taxonomic group in mapping biodiversity patterns. Fish and aquatic macroinvertebrate species data for sites down the longitudinal axes of...