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dc.contributor.authorSamuni, Liran
dc.contributor.authorMielke, Alexander
dc.contributor.authorPreis, Anna
dc.contributor.authorCrockford, C
dc.contributor.authorWittig, RM
dc.identifier.citationSamuni , L , Mielke , A , Preis , A , Crockford , C & Wittig , RM 2020 , ' Intergroup competition enhances chimpanzee ( Pan troglodytes verus ) in-group cohesion ' , International Journal of Primatology , vol. 41 , no. 2 , pp. 342-362 .
dc.identifier.otherPURE: 276614124
dc.identifier.otherPURE UUID: f95efde5-9d75-497d-805f-94500e4d4d6b
dc.identifier.otherBibtex: samuni2020intergroup
dc.identifier.otherScopus: 85077053887
dc.descriptionCore funding for the Taï Chimpanzee Project is provided by the Max Planck Society since 1997. This study was also funded by the Minerva Foundation, Leakey Foundation, and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreement No 679787).en
dc.description.abstractIn-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.
dc.relation.ispartofInternational Journal of Primatologyen
dc.rightsCopyright The Author(s) 2019. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder.en
dc.subjectCollective actionen
dc.subjectIntergroup conflicten
dc.subjectPan troglodytesen
dc.subjectVolunteer’s dilemmaen
dc.subjectBF Psychologyen
dc.titleIntergroup competition enhances chimpanzee (Pan troglodytes verus) in-group cohesionen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews. School of Psychology and Neuroscienceen
dc.description.statusPeer revieweden

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