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dc.contributor.authorNewton-Fisher, Nicholas E-
dc.contributor.authorLee, Phyllis C-
dc.description.abstractUnderstanding cooperation between unrelated individuals remains a central problem in animal behaviour; evolutionary mechanisms are debated, and the importance of reciprocity has been questioned. Biological market theory makes specific predictions about the occurrence of reciprocity in social groups; applied to the social grooming of mammals, it predicts reciprocity in the absence of other benefits for which grooming can be exchanged. Considerable effort has been made to test this grooming trade model in nonhuman primates; such studies show mixed results, but may be confounded by kin effects. We examined patterns of reciprocity within and across bouts, and tested predictions of the grooming trade model, among wild male chimpanzees, Pan troglodytes: a system with negligible kin effects. In accord with the model's expectations, we found that some grooming was directed by lower- to higher-ranked individuals, and that, on average, higher-ranked individuals groomed more reciprocally. We found no support, however, for a prediction that more reciprocity should occur between individuals close in rank. For most dyads, reciprocity of effort occurred through unbalanced participation in grooming bouts, but reciprocity varied considerably between dyads and only a small proportion showed strongly reciprocal grooming. Despite this, each male had at least one reciprocal grooming relationship. In bouts where both individuals groomed, effort was matched through mutual grooming, not alternating roles. Our results provide mixed support for the current grooming trade, biological market model, and suggest that it needs to incorporate risks of currency inflation and cheating for species where reciprocity can be achieved through repeated dyadic interactions.en_UK
dc.publisherElsevier Masson-
dc.relationNewton-Fisher NE & Lee PC (2011) Grooming reciprocity in wild male chimpanzees, Animal Behaviour, 81 (2), pp. 439-446.-
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author; you can only request a copy if you wish to use this work for your own research or private study.-
dc.subjectbiological market theoryen_UK
dc.subjectchimpanzee groomingen_UK
dc.subject.lcshChimpanzees Behavior-
dc.subject.lcshSocial behavior in animals-
dc.titleGrooming reciprocity in wild male chimpanzeesen_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreasonThe publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work.-
dc.citation.jtitleAnimal Behaviour-
dc.type.statusPublisher version (final published refereed version)-
dc.contributor.affiliationUniversity of Kent-
Appears in Collections:Psychology Journal Articles

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