Collective decision-making in white-faced capuchin monkeys

  • O. Petit
    Ethologie des Primates, Département Ethologie Physiologie Ecologie, Institut Pluridisciplinaire Hubert Curien, Centre National de la Recherche Scientifique—Université de Strasbourg, 23 rue Becquerel, 67087 Strasbourg Cedex 2, France
  • J. Gautrais
    Centre de Recherche sur la Cognition Animale, UMR 5169, Centre National de la Recherche Scientifique—Université Paul Sabatier, Bât 4R3, 118 Route de Narbonne, 31062 Toulouse Cedex 4, France
  • J.-B. Leca
    Ethologie des Primates, Département Ethologie Physiologie Ecologie, Institut Pluridisciplinaire Hubert Curien, Centre National de la Recherche Scientifique—Université de Strasbourg, 23 rue Becquerel, 67087 Strasbourg Cedex 2, France
  • G. Theraulaz
    Centre de Recherche sur la Cognition Animale, UMR 5169, Centre National de la Recherche Scientifique—Université Paul Sabatier, Bât 4R3, 118 Route de Narbonne, 31062 Toulouse Cedex 4, France
  • J.-L. Deneubourg
    Service d'Ecologie Sociale, CP 231, Université libre de Bruxelles, Campus Plaine, Boulevard du Triomphe, 1050 Bruxelles, Belgium

書誌事項

公開日
2009-07-15
権利情報
  • https://royalsociety.org/journals/ethics-policies/data-sharing-mining/
DOI
  • 10.1098/rspb.2009.0983
公開者
The Royal Society

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説明

<jats:p>In group-living animals, collective movements are a widespread phenomenon and occur through consensus decision. When one animal proposes a direction for group movement, the others decide to follow or not and hence take part in the decision-making process. This paper examines the temporal spread of individual responses after the departure of a first individual (the initiator) in a semi-free ranging group of white-faced capuchins (<jats:italic>Cebus capucinus</jats:italic>). We analysed 294 start attempts, 111 succeeding and 183 failing. Using a modelling approach, we have demonstrated that consensus decision-making for group movements is based on two complementary phenomena in this species: firstly, the joining together of group members thanks to a mimetic process; and secondly, a modulation of this phenomenon through the propensity of the initiator to give up (i.e. cancellation rate). This cancellation rate seems to be directly dependent upon the number of followers: the greater this number is, the lower the cancellation rate is seen to be. The coupling between joining and cancellation rates leads to a quorum: when three individuals join the initiator, the group collectively moves. If the initiator abandons the movement, this influences the joining behaviour of the other group members, which in return influences the initiator's behaviour. This study demonstrates the synergy between the initiator's behaviour and the self-organized mechanisms underlying group movements.</jats:p>

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