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  • 1
    Book
    Book
    Table Bay : a marine chemical study (1985)
    Setllenbosh : Marine Chemistry Div., National Research Inst. for Oceanology, Council for Scientific and Industrial Research
    Details Availability
    Type of Medium: Book
    Pages: 23, [40] Bl , zahlr. graph. Darst
    ISBN: 0798831391
    Series Statement: CSIR research report 565
    Language: English
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  • 2
    Electronic Resource
    Electronic Resource
    Relationships between meiofaunal population densities and physico-chemical properties of unpolluted sandy beaches (1982)
    Springer
    Environmental monitoring and assessment 1 (1982), S. 337-344 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Water and sediment samples from ten unpolluted sandy beaches have been analysed for various chemical parameters and meiofauna. The results have indicated that, within the range of grain sizes found, (196–337 μm), short term fluctuations in the natural levels of the various chemical constituents do not significantly influence the densities of meiofauna populations. These are, however, governed largely by the median grain size of the sediments. The relationships between median grain size and the population densities of nematodes and harpacticoid copepods have been established. The optimum grain size for the populations studied was 284 μm, and as the sediment size deviated from this, the population density decreased. Thus knowledge of the median grain size of sediments should indicate the approximate meiofaunal density which can be expected in the absence of any other external influence. Deviations from this can then be attributed to perturbation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403834
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  • 3
    Electronic Resource
    Electronic Resource
    Ratio and population density of psammolittoral meiofauna as a perturbation indicator of sandy beaches in South Africa (1983)
    Springer
    Environmental monitoring and assessment 3 (1983), S. 45-60 
    Details
    ISSN: 1573-2959
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Since 1975, pollution surveys have been carried out along the South African south and west coasts as part of a monitoring program of unpolluted areas and known and anticipated impact areas. To evaluate these data a reference or baseline level was needed. In unpolluted beaches a close relationship between meiofauna and sediment grain size was found and granulometric analysis was found to be important. This relationship was used to evaluated perturbation effects. It was found that contamination by chemical effluent depressed numbers of the nematodes and harpacticoids drastically. Mechanical perturbation increased the number of harpacticoid copepods but did not affect nematode densities. Oil in beaches decreased the number of harpacticoids, while normal nematode densities were found. Organic enrichment increased the number of nematodes, harpacticoid numbers remained normal while the perturbation effect due to sewage increased the number of both taxa. Explanations for these effects are given, together with related chemical analyses. The application of these results to other sandy beaches elsewhere is discussed briefly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394031
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