Population density and intra- and interspecific competition of the African Fish Eagle Haliaeetus vocifer in Kyambura Game Reserve, southwest Uganda

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Publication Details

Output type: Journal article

Author list: Krueger O

Publisher: Wiley

Publication year: 1997

Journal: Ibis: International Journal of Avian Science (0019-1019)

Volume number: 139

Issue number: 1

Start page: 19

End page: 24

Number of pages: 6

ISSN: 0019-1019

eISSN: 1474-919X

Languages: English-Great Britain (EN-GB)

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Open access status: closed

Abstract

Population density and intra- and interspecific competition of the African Fish Eagle Haliaeetus vocifer were studied in Kyambura Game Reserve, southwest Uganda. Density varied significantly between 1.75 and 3.25 individuals per km of shore for the breeding biotopes along the Kazinga Channel and crater lakes and between 0.45 and 0.58 for unsuitable biotopes such as the Kyambura Gorge or the bush grassland. The age-class distribution showed extremely high percentages of immatures in these unsuitable biotopes (50-95%) as a consequence of intraspecific competition for space and food. Some immatures survived in the bush grassland, feeding on lion and leopard kills and very possibly on birds. Each territory was up to five times larger than breeding pair territories along the Kazinga Channel (5.1 km(2) in comparison with 0.9 km(2)). Interspecific competition for space was likely between immature African Fish Eagles and other species of raptors. Ecological segregation with regard to space was assessed between these species in the bush grassland.

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