English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Intergroup competition enhances chimpanzee (Pan troglodytes verus) in-group cohesion

MPS-Authors
/persons/resource/persons129528

Samuni,  Liran
Chimpanzees, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Endocrinology Laboratory, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

/persons/resource/persons98846

Mielke,  Alexander
Chimpanzees, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

/persons/resource/persons72908

Preis,  Anna
Chimpanzees, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Endocrinology Laboratory, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

/persons/resource/persons72635

Crockford,  Catherine ǂ
Chimpanzees, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

/persons/resource/persons73044

Wittig,  Roman M.
Chimpanzees, Department of Primatology, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;

External Resource
No external resources are shared
Fulltext (public)

Samuni_Intergroup_IntJPrim_2019.pdf
(Publisher version), 614KB

Supplementary Material (public)
There is no public supplementary material available
Citation

Samuni, L., Mielke, A., Preis, A., Crockford, C. ǂ., & Wittig, R. M. (2020). Intergroup competition enhances chimpanzee (Pan troglodytes verus) in-group cohesion. International Journal of Primatology, 41, 342-362. doi:10.1007/s10764-019-00112-y.


Cite as: http://hdl.handle.net/21.11116/0000-0004-5574-A
Abstract
In-group cohesion is an essential component of successful intergroup competition in both human and nonhuman animals, likely facilitating group members access to potential benefits. However, when benefits are equally shared among group members, group defense becomes a collective action problem, which might subvert cohesive participation during intergroup competition. There is a lack of consensus across studies and species with regard to the link between in-group cohesion and intergroup competition, likely as a result of species differences in managing the collective action problem. Here, we examine this link in a species with a striking example of collective action during intergroup competition, chimpanzees (Pan troglodytes verus). Using two years of focal-follow data on males and females in two groups at the Taï Forest, Côte d’Ivoire, we investigated the immediate and long-term effects of intergroup competition (border patrols and intergroup encounters) on measures of in-group cohesion, namely modularity, party size, and intergroup aggression. We found that groups’ association patterns were less modular (more cohesive) in months in which they engaged in more border patrols and intergroup encounters. We found that current and greater prior engagement in intergroup competition predicted larger party sizes. Furthermore, current, but not prior engagement in intergroup competition, predicted reduced intragroup aggression by males but not by females. Increased in-group cohesion in chimpanzees likely reduces potential costs of intergroup competition engagement, by facilitating joint participation in current and future intergroup conflicts, overcoming the collective action problem.