Effects of habitat structure and shrub encroachment on bird species diversity in arid savanna in Northern Cape province, South Africa

  • Timo Kaphengst University of Greifswald, Institute of Botany and Landscape Ecology, Grimmer Straße 88, 17487 Greifswald, Germany
  • David Ward Department of Conservation Ecology, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa; current address: School of Biological and Conservation Sciences, University of KwaZulu-Natal, Private Bag X01, Scottsville 3209, South Africa


Bird community diversity was assessed in semi-arid savanna in the Northern Cape province of South Africa and related to vegetation diversity and foliage height diversity. As this is an area in which shrub encroachment is common, the effects of shrub or bush encroachment on bird species diversity were specifically addressed. An experiment in which the dominant encroaching species, Acacia mellifera, was removed from ten 1 ha plots was used and compared with ten controls. A strong positive association with foliage height diversity was shown. No effect of experimental removal of the dominant encroacher, A. mellifera, on bird species diversity or species richness was found. However, four species increased in relative abundance in cut plots and two species decreased in relative abundance in these plots.

Ostrich 2008, 79(2): 133–140

Journal Identifiers

eISSN: 1727-947X
print ISSN: 0030-6525