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Related Experiment Videos

Coalition formation among male Barbary macaques (Macaca sylvanus).

A Widdig1, W J Streich, G Tembrock

  • 1Institut für Biologie, Humboldt-Universität zu Berlin, Germany. anja.widdig@charite.de

American Journal of Primatology
|December 10, 1999
PubMed
Summary
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Male Barbary macaques form coalitions through kin selection, reciprocal altruism, and cooperation. Supporting relatives and engaging in self-interested alliances are key drivers of coalition formation in this species.

Area of Science:

  • Ethology
  • Behavioral Ecology
  • Primatology

Background:

  • Coalition formation is a triadic interaction where one animal supports another against a third party.
  • Understanding the evolutionary drivers of coalitionary support is crucial in social species.

Purpose of the Study:

  • To investigate the underlying theories of coalition formation in male Barbary macaques.
  • To determine whether kin selection, reciprocal altruism, or cooperation best explains these alliances.

Main Methods:

  • Observational study of 31 semi-free-ranging male Barbary macaques during the mating season.
  • Analysis of intervention patterns in dyadic conflicts to identify supporter, recipient, and target relationships.

Main Results:

Related Experiment Videos

  • Males preferentially supported related individuals, with closer kin receiving more support.
  • Evidence for reciprocal support was observed, potentially as a byproduct of dominance interactions.
  • Non-kin coalitions were best explained by cooperation, driven by immediate self-interests, often to stabilize rank.

Conclusions:

  • Coalition formation in male Barbary macaques is multifaceted, involving kin support, reciprocal altruism, and cooperation.
  • Both genetic relatedness and self-interest play significant roles in alliance formation.
  • The findings suggest a complex interplay of evolutionary strategies in primate social behavior.