Show simple item record Bonyongo, M.C. Harris, S. 2010-10-04T08:17:39Z 2010-10-04T08:17:39Z 2007
dc.identifier.citation Bonyongo M.C. & Harris S. (2007) Grazers species-packing in the Okavango Delta, Botswana, African Journal of Ecology, Vol. 45, No. 4, pp. 527-534 en_US
dc.identifier.issn 1012 2974
dc.description.abstract We used body weight ratio to determine the degree of species-packing of the Okavango Delta (22,000 km2) grazers and compared it to that of four conservation areas of similar sizes but varying in the diversity of habitat types. They are Etosha National Park (23,175 km2) in Namibia, Hwange National Park (14,621 km2) in Zimbabwe, Kafue National Park (24,000 km2) in Zambia and Kruger National Park (19,633 km2) in South Africa. We considered possible ecological explanations for existing gaps within the assemblage. The weight ratio (measure of the degree of species-packing) of the grazers of the Okavango Delta was 1.25, with a total of 27 species which was far less than the theoretically expected 2.0. One-way analysis of covariance (ANCOVA) showed that there were significant differences in the degree of species-packing between the Okavango Delta and other conservation areas of similar size in southern Africa (F1,5 ¼ 166, P < 0.001). Regressing habitat heterogeneity (expressed as number of different habitat types) on species-packing of the five conservation areas yielded a positive linear relationship with R2 ¼ 0.76 implying that 76% of the variation in the degree of speciespacking in the five conservation areas is explained by variation in habitat heterogeneity. We conclude that size ratios are useful descriptors of animal communities and it is a useful measure of species diversity, which can be used for monitoring purposes. Imbalances in weight ratios provide a measure of identifying perturbations due to species loss or arrival of new species within a natural ecosystem. en_US
dc.language.iso en en_US
dc.publisher Willey Blackwell Publishing en_US
dc.subject Body size en_US
dc.subject Weight ratio en_US
dc.subject Co-existance en_US
dc.subject.lcsh Animal ecology en_US
dc.title Grazers species-packing in the Okavango Delta, Botswana en_US
dc.type Published Article en_US en_US

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