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Social network changes during space restriction in zoo chimpanzees

Koyama, NF and Aureli, F Social network changes during space restriction in zoo chimpanzees. Primates. ISSN 1610-7365 (Accepted)

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Abstract

Several studies across anthropoid species have demonstrated how primates respond to the increased risk of conflict during space restriction with various behavioural strategies. Three strategies have been proposed relating to tension regulation, conflict avoidance and inhibition. Prior research supporting these strategies has focused on individual- and dyadic-level analyses, yet group-living animals live within a web of inter-individual connections. Here, for the first time we used a network approach to investigate how social structure and individuals’ connectedness change during space restriction. We collected grooming and aggression data during a 6-week control period and a 5-week period of space restriction in a large group of zoo chimpanzees. We compared network density and individual centrality measures (degree, eigenvector and betweenness centrality) between these two periods using permutation tests. The density of the unidirectional grooming network was significantly lower during space restriction, indicating fewer grooming partners and a less cohesive network. This was mainly due to a reduction in females’ grooming partners (degree) and an increase in females’ betweenness centrality. We found no differences in the mutual grooming or aggression networks. Our findings are consistent with a conflict avoidance strategy and complement previous findings from the same dataset based on individual behavioural rates that supported a selective inhibition strategy. The results highlight the dynamic nature of social structure and its inherent flexibility to respond effectively to short-term changes in the environment.

Item Type: Article
Uncontrolled Keywords: 0608 Zoology
Subjects: Q Science > QL Zoology
Divisions: Natural Sciences and Psychology
Publisher: Springer Verlag
Date Deposited: 06 Jul 2018 10:45
Last Modified: 06 Jul 2018 10:45
URI: http://researchonline.ljmu.ac.uk/id/eprint/8922

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