Department of Conservation Ecology and Entomology

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Browsing Department of Conservation Ecology and Entomology by browse.metadata.advisor "Berry, M. P. S."

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    A study of sex/age ratios in wild ungulate populations : an approach to designing an appropriate sampling strategy for estimating the structure of wild ungulate populations on Rooipoort Nature Reserve
    (Stellenbosch : Stellenbosch University, 2000-03) Laubscher, Sarah-Jane; Van Hensbergen, H. J.; Berry, M. P. S.; Stellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology.
    ENGLISH ABSTRACT: This thesis investigates the population structure of a number of ungulate species occurring within Rooipoort private reserve. Specifically the study serves to make estimates of the ratio of males to females and calves to cows within each species population under observation, based on the data collected. Data were also analysed to ascertain the distribution patterns of the species in question, in relation to vegetation type and habitat. Distribution data were additionally compared to distribution data collected at an earlier period on Rooipoort, to determine whether any change has occurred in distribution patterns of the ungulates concerned. Through analysis of both sex/age data and distributional data, one of the main objectives of the study was to determine the most appropriate time of the year, length of time and managment costs involved to undertake sex/age counts on Rooipoort. Results of the study were also compared to existing population models of ungulates on the reserve. Results obtained from data concluded that a single monthly sex/age count or, in some cases, even three consecutive monthly counts, to determine age ratios, would be insufficient to deliver a reliable estimate of population structure. A number of counts would have to be carried out throughout the year in order to make reliable estimates. Distribution data revealed that all habitat/vegetation types on Rooipoort would have to be covered in order to effectively sample all of the species in question.