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Collective motion diminishes, but variation between groups emerges, through time in fish shoals

Despite extensive interest in the dynamic interactions between individuals that drive collective motion in animal groups, the dynamics of collective motion over longer time frames are understudied. Using three-spined sticklebacks, Gasterosteus aculeatus, randomly assigned to 12 shoals of eight fish,...

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Detalles Bibliográficos
Autores principales: MacGregor, Hannah E. A., Ioannou, Christos C.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8527212/
https://www.ncbi.nlm.nih.gov/pubmed/34703618
http://dx.doi.org/10.1098/rsos.210655
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author MacGregor, Hannah E. A.
Ioannou, Christos C.
author_facet MacGregor, Hannah E. A.
Ioannou, Christos C.
author_sort MacGregor, Hannah E. A.
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description Despite extensive interest in the dynamic interactions between individuals that drive collective motion in animal groups, the dynamics of collective motion over longer time frames are understudied. Using three-spined sticklebacks, Gasterosteus aculeatus, randomly assigned to 12 shoals of eight fish, we tested how six key traits of collective motion changed over shorter (within trials) and longer (between days) timescales under controlled laboratory conditions. Over both timescales, groups became less social with reduced cohesion, polarization, group speed and information transfer. There was consistent inter-group variation (i.e. collective personality variation) for all collective motion parameters, but groups also differed in how their collective motion changed over days in their cohesion, polarization, group speed and information transfer. This magnified differences between groups, suggesting that over time the ‘typical’ collective motion cannot be easily characterized. Future studies are needed to understand whether such between-group differences in changes over time are adaptive and represent improvements in group performance or are suboptimal but represent a compromise between individuals in their preferences for the characteristics of collective behaviour.
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spelling pubmed-85272122021-10-25 Collective motion diminishes, but variation between groups emerges, through time in fish shoals MacGregor, Hannah E. A. Ioannou, Christos C. R Soc Open Sci Organismal and Evolutionary Biology Despite extensive interest in the dynamic interactions between individuals that drive collective motion in animal groups, the dynamics of collective motion over longer time frames are understudied. Using three-spined sticklebacks, Gasterosteus aculeatus, randomly assigned to 12 shoals of eight fish, we tested how six key traits of collective motion changed over shorter (within trials) and longer (between days) timescales under controlled laboratory conditions. Over both timescales, groups became less social with reduced cohesion, polarization, group speed and information transfer. There was consistent inter-group variation (i.e. collective personality variation) for all collective motion parameters, but groups also differed in how their collective motion changed over days in their cohesion, polarization, group speed and information transfer. This magnified differences between groups, suggesting that over time the ‘typical’ collective motion cannot be easily characterized. Future studies are needed to understand whether such between-group differences in changes over time are adaptive and represent improvements in group performance or are suboptimal but represent a compromise between individuals in their preferences for the characteristics of collective behaviour. The Royal Society 2021-10-20 /pmc/articles/PMC8527212/ /pubmed/34703618 http://dx.doi.org/10.1098/rsos.210655 Text en © 2021 The Authors. https://creativecommons.org/licenses/by/4.0/Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, provided the original author and source are credited.
spellingShingle Organismal and Evolutionary Biology
MacGregor, Hannah E. A.
Ioannou, Christos C.
Collective motion diminishes, but variation between groups emerges, through time in fish shoals
title Collective motion diminishes, but variation between groups emerges, through time in fish shoals
title_full Collective motion diminishes, but variation between groups emerges, through time in fish shoals
title_fullStr Collective motion diminishes, but variation between groups emerges, through time in fish shoals
title_full_unstemmed Collective motion diminishes, but variation between groups emerges, through time in fish shoals
title_short Collective motion diminishes, but variation between groups emerges, through time in fish shoals
title_sort collective motion diminishes, but variation between groups emerges, through time in fish shoals
topic Organismal and Evolutionary Biology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8527212/
https://www.ncbi.nlm.nih.gov/pubmed/34703618
http://dx.doi.org/10.1098/rsos.210655
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