http://www.cnr.it/ontology/cnr/individuo/prodotto/ID224730

Diffusion of individual birds in starling flocks (Articolo in rivista)

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Diffusion of individual birds in starling flocks (Articolo in rivista) (literal)

Anno

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Alternative label

A. Cavagna (1,2); S. M. Duarte Queirós (1); I. Giardina (1,2); F. Stefanini (3); M. Viale (1,2) (2013)
Diffusion of individual birds in starling flocks
in Proceedings - Royal Society. Biological sciences (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

A. Cavagna (1,2); S. M. Duarte Queirós (1); I. Giardina (1,2); F. Stefanini (3); M. Viale (1,2) (literal)

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http://rspb.royalsocietypublishing.org/content/280/1756/20122484.short (literal)

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(1) Istituto dei Sistemi Complessi, UOS Sapienza, CNR, via dei Taurini 19, 00185 Roma, Italy (2) Dipartimento di Fisica, Università Sapienza, P. le Aldo Moro 2, 00185 Roma, Italy (3) Institute of Neuroinformatics, University of Zurich and ETH Zurich, Winterthurerstrasse, 190 8057 Zurich, Switzerland (literal)

Titolo

Abstract

Flocking is a paradigmatic example of collective animal behaviour, where global order emerges out of self-organization. Each individual has a tendency to align its flight direction with those of neighbours, and such a simple form of interaction produces a state of collective motion of the group. When compared with other cases of collective ordering, a crucial feature of animal groups is that the interaction network is not fixed in time, as each individual moves and continuously changes its neighbours. The possibility to exchange neighbours strongly enhances the stability of global ordering and the way information is propagated through the group. Here, we assess the relevance of this mechanism in large flocks of starlings (Sturnus vulgaris). We find that birds move faster than Brownian walkers both with respect to the centre of mass of the flock, and with respect to each other. Moreover, this behaviour is strongly anisotropic with respect to the direction of motion of the flock. We also measure the amount of neighbours reshuffling and find that neighbours change in time exclusively as a consequence of the random fluctuations in the individual motion, so that no specific mechanism to keep one's neighbours seems to be enforced. On the contrary, our findings suggest that a more complex dynamical process occurs at the border of the flock. (literal)

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