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Science. 2018 May 25;360(6391):911-914. doi: 10.1126/science.aap7781.

From local collective behavior to global migratory patterns in white storks.

Author information

1
Department of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, Radolfzell, Germany. aflack@orn.mpg.de mnagy@orn.mpg.de.
2
Department of Biology, University of Konstanz, Konstanz, Germany.
3
Department of Biology, University of Konstanz, Konstanz, Germany. aflack@orn.mpg.de mnagy@orn.mpg.de.
4
Department of Collective Behaviour, Max Planck Institute for Ornithology, Konstanz, Germany.
5
MTA-ELTE Statistical and Biological Physics Research Group, Hungarian Academy of Sciences, Budapest, Hungary.
6
Department of Migration and Immuno-Ecology, Max Planck Institute for Ornithology, Radolfzell, Germany.

Abstract

Soaring migrant birds exploit columns of rising air (thermals) to cover large distances with minimal energy. Using social information while locating thermals may benefit such birds, but examining collective movements in wild migrants has been a major challenge for researchers. We investigated the group movements of a flock of 27 naturally migrating juvenile white storks by using high-resolution GPS and accelerometers. Analyzing individual and group movements on multiple scales revealed that a small number of leaders navigated to and explored thermals, whereas followers benefited from their movements. Despite this benefit, followers often left thermals earlier and at lower height, and consequently they had to flap considerably more. Followers also migrated less far annually than did leaders. We provide insights into the interactions between freely flying social migrants and the costs and benefits of collective movement in natural populations.

PMID:
29798883
DOI:
10.1126/science.aap7781
[Indexed for MEDLINE]

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