Scalable Rules for Coherent Group Motion in a Gregarious Vertebrate

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2011
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Pillot, Marie-Hélène
Gautrais, Jacques
Arrufat, Patrick
Bon, Richard
Deneubourg, Jean-Louis
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PLoS ONE. 2011, 6(1), e14487. eISSN 1932-6203. Available under: doi: 10.1371/journal.pone.0014487
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Individuals of gregarious species that initiate collective movement require mechanisms of cohesion in order to maintain advantages of group living. One fundamental question in the study of collective movement is what individual rules are employed when making movement decisions. Previous studies have revealed that group movements often depend on social interactions among individual members and specifically that collective decisions to move often follow a quorum-like response. However, these studies either did not quantify the response function at the individual scale (but rather tested hypotheses based on group-level behaviours), or they used a single group size and did not demonstrate which social stimuli influence the individual decision-making process. One challenge in the study of collective movement has been to discriminate between a common response to an external stimulus and the synchronization of behaviours resulting from social interactions. Here we discriminate between these two mechanisms by triggering the departure of one trained Merino sheep (Ovis aries) from groups containing one, three, five and seven naïve individuals. Each individual was thus exposed to various combinations of already-departed and non-departed individuals, depending on its rank of departure. To investigate which individual mechanisms are involved in maintaining group cohesion under conditions of leadership, we quantified the temporal dynamic of response at the individual scale. We found that individuals' decisions to move do not follow a quorum response but rather follow a rule based on a double mimetic effect: attraction to already-departed individuals and attraction to non-departed individuals. This rule is shown to be in agreement with an adaptive strategy that is inherently scalable as a function of group size.

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570 Biowissenschaften, Biologie
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ISO 690PILLOT, Marie-Hélène, Jacques GAUTRAIS, Patrick ARRUFAT, Iain D. COUZIN, Richard BON, Jean-Louis DENEUBOURG, 2011. Scalable Rules for Coherent Group Motion in a Gregarious Vertebrate. In: PLoS ONE. 2011, 6(1), e14487. eISSN 1932-6203. Available under: doi: 10.1371/journal.pone.0014487
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@article{Pillot2011-01-05Scala-37584,
  year={2011},
  doi={10.1371/journal.pone.0014487},
  title={Scalable Rules for Coherent Group Motion in a Gregarious Vertebrate},
  number={1},
  volume={6},
  journal={PLoS ONE},
  author={Pillot, Marie-Hélène and Gautrais, Jacques and Arrufat, Patrick and Couzin, Iain D. and Bon, Richard and Deneubourg, Jean-Louis},
  note={Article Number: e14487}
}
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