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19 - Effects of large-scale knockouts on chimpanzee association networks

Published online by Cambridge University Press:  25 November 2019

By
Julia Riedel ,
Christophe Boesch  and
Mathias Franz
Edited by
Christophe Boesch  and
Roman Wittig
Edited in association with
Catherine Crockford ,
Linda Vigilant ,
Tobias Deschner  and
Fabian Leendertz
Christophe Boesch
Affiliation:
Max-Planck-Institut für Evolutionäre Anthropologie, Germany
Roman Wittig
Affiliation:
Max-Planck-Institut für Evolutionäre Anthropologie, Germany
Catherine Crockford
Affiliation:
Max-Planck-Institut für Evolutionäre Anthropologie, Germany
Linda Vigilant
Affiliation:
Max-Planck-Institut für Evolutionäre Anthropologie, Germany
Tobias Deschner
Affiliation:
Max-Planck-Institut für Evolutionäre Anthropologie, Germany
Fabian Leendertz
Affiliation:
Robert Koch-Institut, Germany
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Summary

Social network analysis is a widely applied tool to study the social organization of different species. Only few studies have investigated social network changes over time. A previous study of the North Group chimpanzees in Taï National Park indicated network structure changes with decreasing community size. We investigated how two natural ‘knockouts’, i.e. sudden large-scale declines in community size, affected association networks. Network dynamics following the 1992 knockout, during which eight individuals died, showed a delayed response: in the first months, association rates were lower than expected, and only after seven months did they converge to expected community-size–specific level. In contrast, network dynamics following the 1994 knockout, during which 12 individuals died, showed no deviation from expected community-size–specific levels. Thus, chimpanzee association networks can react differently to large-scale declines in community size. Differences might be related to the identity of deceased individuals and knockout amplitude. The patterns of observed changes did not support the idea that large-scale knockouts lead to strong disturbances of chimpanzee communities.

Keywords

ChimpanzeeK23 Pan troglodytesSocial networkCommunity sizeKnockoutAssociation
Type
Chapter
Information
The Chimpanzees of the Taï Forest
40 Years of Research
 , pp. 301 - 315
Publisher: Cambridge University Press
Print publication year: 2019

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