Collective decision making and social interaction rules in mixed-species flocks of songbirds

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2014
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Garroway, Colin J.
Mann, Richard P.
Sheldon, Ben C.
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Animal behaviour. 2014, 95, pp. 173-182. ISSN 0003-3472. eISSN 1095-8282. Available under: doi: 10.1016/j.anbehav.2014.07.008
Zusammenfassung

Associations in mixed-species foraging groups are common in animals, yet have rarely been explored in the context of collective behaviour. Despite many investigations into the social and ecological conditions under which individuals should form groups, we still know little about the specific behavioural rules that individuals adopt in these contexts, or whether these can be generalized to heterospecifics. Here, we studied collective behaviour in flocks in a community of five species of woodland passerine birds. We adopted an automated data collection protocol, involving visits by RFID-tagged birds to feeding stations equipped with antennae, over two winters, recording 91 576 feeding events by 1904 individuals. We demonstrated highly synchronized feeding behaviour within patches, with birds moving towards areas of the patch with the largest proportion of the flock. Using a model of collective decision making, we then explored the underlying decision rule birds may be using when foraging in mixed-species flocks. The model tested whether birds used a different decision rule for conspecifics and heterospecifics, and whether the rules used by individuals of different species varied. We found that species differed in their response to the distribution of conspecifics and heterospecifics across foraging patches. However, simulating decisions using the different rules, which reproduced our data well, suggested that the outcome of using different decision rules by each species resulted in qualitatively similar overall patterns of movement. It is possible that the decision rules each species uses may be adjusted to variation in mean species abundance in order for individuals to maintain the same overall flock-level response. This is likely to be important for maintaining coordinated behaviour across species, and to result in quick and adaptive flock responses to food resources that are patchily distributed in space and time.

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570 Biowissenschaften, Biologie
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collective behaviour, Cyanistes caeruleus, decision making, interspecific interaction, mixed-species flocking, Paridae, Parus major, social information use
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ISO 690FARINE, Damien R., Lucy M. APLIN, Colin J. GARROWAY, Richard P. MANN, Ben C. SHELDON, 2014. Collective decision making and social interaction rules in mixed-species flocks of songbirds. In: Animal behaviour. 2014, 95, pp. 173-182. ISSN 0003-3472. eISSN 1095-8282. Available under: doi: 10.1016/j.anbehav.2014.07.008
BibTex
@article{Farine2014-09Colle-44895,
  year={2014},
  doi={10.1016/j.anbehav.2014.07.008},
  title={Collective decision making and social interaction rules in mixed-species flocks of songbirds},
  volume={95},
  issn={0003-3472},
  journal={Animal behaviour},
  pages={173--182},
  author={Farine, Damien R. and Aplin, Lucy M. and Garroway, Colin J. and Mann, Richard P. and Sheldon, Ben C.}
}
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