Scalable rules for coherent group motion in a gregarious vertebrate.

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...

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Autores principales:	Marie-Hélène Pillot, Jacques Gautrais, Patrick Arrufat, Iain D Couzin, Richard Bon, Jean-Louis Deneubourg
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2011
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/66806a113f084599834ffa0c0db3df98
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id	oai:doaj.org-article:66806a113f084599834ffa0c0db3df98
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spelling	oai:doaj.org-article:66806a113f084599834ffa0c0db3df982021-11-18T07:00:47ZScalable rules for coherent group motion in a gregarious vertebrate.1932-620310.1371/journal.pone.0014487https://doaj.org/article/66806a113f084599834ffa0c0db3df982011-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/21245930/?tool=EBIhttps://doaj.org/toc/1932-6203Individuals 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.Marie-Hélène PillotJacques GautraisPatrick ArrufatIain D CouzinRichard BonJean-Louis DeneubourgPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 6, Iss 1, p e14487 (2011)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Marie-Hélène Pillot Jacques Gautrais Patrick Arrufat Iain D Couzin Richard Bon Jean-Louis Deneubourg Scalable rules for coherent group motion in a gregarious vertebrate.
description	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.
format	article
author	Marie-Hélène Pillot Jacques Gautrais Patrick Arrufat Iain D Couzin Richard Bon Jean-Louis Deneubourg
author_facet	Marie-Hélène Pillot Jacques Gautrais Patrick Arrufat Iain D Couzin Richard Bon Jean-Louis Deneubourg
author_sort	Marie-Hélène Pillot
title	Scalable rules for coherent group motion in a gregarious vertebrate.
title_short	Scalable rules for coherent group motion in a gregarious vertebrate.
title_full	Scalable rules for coherent group motion in a gregarious vertebrate.
title_fullStr	Scalable rules for coherent group motion in a gregarious vertebrate.
title_full_unstemmed	Scalable rules for coherent group motion in a gregarious vertebrate.
title_sort	scalable rules for coherent group motion in a gregarious vertebrate.
publisher	Public Library of Science (PLoS)
publishDate	2011
url	https://doaj.org/article/66806a113f084599834ffa0c0db3df98
work_keys_str_mv	AT mariehelenepillot scalablerulesforcoherentgroupmotioninagregariousvertebrate AT jacquesgautrais scalablerulesforcoherentgroupmotioninagregariousvertebrate AT patrickarrufat scalablerulesforcoherentgroupmotioninagregariousvertebrate AT iaindcouzin scalablerulesforcoherentgroupmotioninagregariousvertebrate AT richardbon scalablerulesforcoherentgroupmotioninagregariousvertebrate AT jeanlouisdeneubourg scalablerulesforcoherentgroupmotioninagregariousvertebrate
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Scalable rules for coherent group motion in a gregarious vertebrate.

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