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Individual contributions to a dyadic interaction: An analysis of baboon grooming
Authors:Eduard Stammbach  Hans Kummer
Institution:Ethology and Wildlife Research, Institute of Zoology, University of Zürich, Birchstrasse 95, 8050 Zürich, Switzerland
Abstract:Grooming in dyads of six captive female hamadryas baboons (Papio hamadryas) was analysed. Each dyad was observed in isolation and as part of a group of three to six females. The isolated dyads differed from dyads in groups, as follows. (1) Grooming in isolated dyads mainly depended on the actor's general tendency to groom, whereas actors in groups were more responsive to who the recipient was. (2) In groups, grooming tended to be more frequent among females of high dominance rank and among females who preferred one another in choice tests. The opposites were true for isolated dyads. Females in isolated dyads seemed to use grooming to improve a poor relationship, whereas grooming in groups was used as if to maintain and defend a valuable relationship.
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