Socioecology, but not cognition, predicts male coalitions across primates (original) (raw)

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Primate Social Evolution Group, Courant Research Centre Evolution of Social Behaviour, Georg-August-University Göttingen

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Kellnerweg 6, Göttingen 37077

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Germany

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Primate Social Evolution Group, Courant Research Centre Evolution of Social Behaviour, Georg-August-University Göttingen

,

Kellnerweg 6, Göttingen 37077

,

Germany

Search for other works by this author on:

,

a

Primate Social Evolution Group, Courant Research Centre Evolution of Social Behaviour, Georg-August-University Göttingen

,

Kellnerweg 6, Göttingen 37077

,

Germany

Search for other works by this author on:

a

Primate Social Evolution Group, Courant Research Centre Evolution of Social Behaviour, Georg-August-University Göttingen

,

Kellnerweg 6, Göttingen 37077

,

Germany

Search for other works by this author on:

Received:

10 October 2013

Revision received:

18 February 2014

Accepted:

24 February 2014

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Annie Bissonnette, Mathias Franz, Oliver Schülke, Julia Ostner, Socioecology, but not cognition, predicts male coalitions across primates, Behavioral Ecology, Volume 25, Issue 4, July-August 2014, Pages 794–801, https://doi.org/10.1093/beheco/aru054
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Humans form agonistic coalitions and alliances in many contexts, but this behavior is thought to be rare in other species. A prominent hypothesis states that coalitions may be under cognitive constraints, but this idea is debated and remains to be tested empirically. In this study, we evaluate the cognitive constraint hypothesis against 3 alternative hypotheses that stress the role of demography, substrate use, and resource competition, for the evolution of male coalitions. A comparative analysis of a unique data set of 86 multimale multifemale groups of 38 nonhuman primate species from all major radiations revealed no evolutionary association of male coalition frequency with cognitive capacity (as indexed by neocortex ratio and endocranial volume). The observed variation was best explained by demography and resource competition in that male coalitions were more likely to occur in species characterized by larger male groups and reduced levels of contest competition (after controlling for phylogeny). These findings suggest that constraints imposed by the socioecological setting, rather than cognition, explain best why some primate species evolved customary coalitionary behavior while others did not. This study presents the first empirical evidence against the long-standing view that cognitive abilities may impose a limit on the use of coalitions in animals.

© The Author 2014. Published by Oxford University Press on behalf of the International Society for Behavioral Ecology. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com

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