Biodiversity & Conservation

, Volume 8, Issue 12, pp 1643–1661

Functional significance of ungulate diversity in African savannas and the ecological implications of the spread of pastoralism

Authors

  • J.T. Du Toit
    • Mammal Research Institute, Department of Zoology and EntomologyUniversity of Pretoria
  • D.H.M. Cumming
    • WWF Southern Africa Regional Programme Office
Article

DOI: 10.1023/A:1008959721342

Cite this article as:
Du Toit, J. & Cumming, D. Biodiversity and Conservation (1999) 8: 1643. doi:10.1023/A:1008959721342

Abstract

The African savanna biome supports a higher diversity of ungulate species than is found in any other biome or continent. This exceptional faunal diversity and herbivore biomass density is directly linked to the high spatial heterogeneity of African savanna ecosystems. The dependence of herbivore dietary tolerance on body size translates into important size-related differences between savanna ungulate species in terms of habitat specificity, geographical range, and the share of community resources exploited. Intact savanna ungulate communities, with species distributed across body size classes and feeding guilds (grazer/browser), have strong regulatory influences on savanna ecosystem structure and function. Replacement with livestock systems of low diversity and high biomass density within a narrow body size range has occurred through the removal of competitors, pathogens, and predators, and the widespread provisioning of water. Overgrazing by livestock, coupled with episodic droughts, has caused widespread rangeland degradation and loss of floristic and faunal diversity which, by current models, is unlikely to recover to 'climax’ conditions even with destocking. In selected regions where potential still exists, African savanna biodiversity and human economic development will both be best served by the integration of sustainable wildlife utilization into multispecies animal production systems.

African savannasbiodiversityconservationmultispecies animal production

Copyright information

© Kluwer Academic Publishers 1999