International Journal of Primatology

, Volume 19, Issue 2, pp 287–297

Group Size and Composition of Colobus guereza in Kyambura Gorge, Southwest Uganda, in Relation to Chimpanzee Activity

Authors

  • Oliver Krüger
    • Department of Animal BehaviourUniversity of Bielefeld, Faculty of Biology
  • Edda Affeldt
    • Department of Animal BehaviourUniversity of Bielefeld, Faculty of Biology
  • Marian Brackmann
    • Department of Animal BehaviourUniversity of Bielefeld, Faculty of Biology
  • Kirsten Milhahn
    • Department of Animal BehaviourUniversity of Bielefeld, Faculty of Biology
Article

DOI: 10.1023/A:1020383600015

Cite this article as:
Krüger, O., Affeldt, E., Brackmann, M. et al. International Journal of Primatology (1998) 19: 287. doi:10.1023/A:1020383600015

Abstract

We documented and assessed the influence of chimpanzee activity on group size and composition of Colobus guereza in Kyambura Gorge, southwest Uganda, from July to September, 1994 and in February and March 1996. The population density of colobus is very high: 347 individuals per km2. Density differed outside activity centers of chimpanzees (525 individuals per km2) and within the centers (186 per km2). We identified a total of 24 colobus groups, ranging between 3 and 13 individuals. Of the 24 groups, 22 were one-male groups. Groups were smaller and the percentage of subadults and juveniles was lower in groups within chimpanzee activity centers. Estimates of home ranges are between 1.7 and 6.2 ha, but neighboring home ranges overlapped ≤80%. Only a territory of approximately 0.5 ha was defended by the alpha male.

Colobus guerezachimpanzeePan troglodytesgroup compositionhome rangepredation risk
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Copyright information

© Plenum Publishing Corporation 1998