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Behavioural plasticity and the transition to order in jackdaw flocks

Hangjian Ling, Guillam E. Mclvor, Joseph Westley, Kasper Vaart, Richard T. Vaughan, Alex Thornton () and Nicholas T. Ouellette ()
Additional contact information
Hangjian Ling: Stanford University
Guillam E. Mclvor: University of Exeter
Joseph Westley: University of Exeter
Kasper Vaart: Stanford University
Richard T. Vaughan: Simon Fraser University
Alex Thornton: University of Exeter
Nicholas T. Ouellette: Stanford University

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract Collective behaviour is typically thought to arise from individuals following fixed interaction rules. The possibility that interaction rules may change under different circumstances has thus only rarely been investigated. Here we show that local interactions in flocks of wild jackdaws (Corvus monedula) vary drastically in different contexts, leading to distinct group-level properties. Jackdaws interact with a fixed number of neighbours (topological interactions) when traveling to roosts, but coordinate with neighbours based on spatial distance (metric interactions) during collective anti-predator mobbing events. Consequently, mobbing flocks exhibit a dramatic transition from disordered aggregations to ordered motion as group density increases, unlike transit flocks where order is independent of density. The relationship between group density and group order during this transition agrees well with a generic self-propelled particle model. Our results demonstrate plasticity in local interaction rules and have implications for both natural and artificial collective systems.

Date: 2019
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DOI: 10.1038/s41467-019-13281-4

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