FACTORS MEDIATING INTER-GROUP ENCOUNTERS IN SAVANNAH BABOONS (PAPIO CYNOCEPHALUS URSINUS) by DAWN M. KITCHEN 1,2) , DOROTHY L. CHENEY 3) and ROBERT M. SEYFARTH 1,4) ( 1 Department of Psychology, University of Pennsylvania, Philadelphia PA, 19104, USA; 3 Department of Biology, University of Pennsylvania, Philadelphia PA, 19104, USA) (Acc. 27-X-2003) Summary Inter-group encounters among baboons range from peaceful to aggressive. During 23 months we observed 110 inter-group interactions involving four groups of chacma baboons in the Okavango Delta, Botswana. Results supported the hypothesis that male behavior functions to prevent extra-group males from gaining access to sexually receptive females. Males were more likely to chase females in their own group when estrous females were present, and their chases targeted estrous females more often than expected. Males also chased members of the opposing group more when estrous females were present. When estrous females were absent, male displays were shorter in duration, involved fewer participants, were less intense, and were more likely to result in peaceful mingling between groups. The alpha male was the individual most actively involved in inter-group chases and displays, but males of all ranks participated, especially when they were in consort with a female. However, males did
Behaviour – Brill
Published: Jan 1, 2004
Keywords: LOUD CALLS; RESOURCE DEFENSE; BABOONS; INTER-GROUP DOMINANCE; FEMALE DEFENSE.
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