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How predation shapes the social interaction rules of shoaling fish
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics. Stockholm University, Department of Zoology.ORCID iD: 0000-0003-0243-4518
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Applied Mathematics and Statistics.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Applied Mathematics and Statistics.
University of Bristol, School of Biological Science.ORCID iD: 0000-0002-9739-889X
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2017 (English)In: Proceedings of the Royal Society of London. Biological Sciences, ISSN 0962-8452, E-ISSN 1471-2954, Vol. 284, no 1861, article id 20171126Article in journal (Refereed) Published
Abstract [en]

Predation is thought to shape the macroscopic properties of animal groups, making moving groups more cohesive and coordinated. Precisely how predation has shaped individuals' fine-scale social interactions in natural populations, however, is unknown. Using high-resolution tracking data of shoaling fish (Poecilia reticulata) from populations differing in natural predation pressure, we show how predation adapts individuals' social interaction rules. Fish originating from high predation environments formed larger, more cohesive, but not more polarized groups than fish from low predation environments. Using a new approach to detect the discrete points in time when individuals decide to update their movements based on the available social cues, we determine how these collective properties emerge from individuals' microscopic social interactions. We first confirm predictions that predation shapes the attraction-repulsion dynamic of these fish, reducing the critical distance at which neighbours move apart, or come back together. While we find strong evidence that fish align with their near neighbours, we do not find that predation shapes the strength or likelihood of these alignment tendencies. We also find that predation sharpens individuals' acceleration and deceleration responses, implying key perceptual and energetic differences associated with how individuals move in different predation regimes. Our results reveal how predation can shape the social interactions of individuals in groups, ultimately driving differences in groups' collective behaviour.

Place, publisher, year, edition, pages
ROYAL SOC , 2017. Vol. 284, no 1861, article id 20171126
Keywords [en]
group living, collective motion, Poecilia reticulata, collective behaviour, interaction rules
National Category
Zoology Ecology
Identifiers
URN: urn:nbn:se:uu:diva-334852DOI: 10.1098/rspb.2017.1126ISI: 000408662400016OAI: oai:DiVA.org:uu-334852DiVA, id: diva2:1160957
Funder
Knut and Alice Wallenberg Foundation, 0962-8452NERC - the Natural Environment Research Council, NE/K009370/1Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2017-12-01Bibliographically approved

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Herbert-Read, James E.Rosén, EmilSzorkovszky, AlexSumpter, David J. T.

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Herbert-Read, James E.Rosén, EmilSzorkovszky, AlexIoannou, Christos C.Sumpter, David J. T.
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