The structure of a bottlenose dolphin society is coupled to a unique foraging cooperation with artisanal fishermen.

Biology Letters
F G Daura-JorgeP C Simões-Lopes

Abstract

Diverse and localized foraging behaviours have been reported in isolated populations of many animal species around the world. In Laguna, southern Brazil, a subset of resident bottlenose dolphins (Tursiops truncatus) uses a foraging tactic involving cooperative interactions with local, beach-casting fishermen. We used individual photo-identification data to assess whether cooperative and non-cooperative dolphins were socially segregated. The social structure of the population was found to be a fission-fusion system with few non-random associations, typical for this species. However, association values were greater among cooperative dolphins than among non-cooperative dolphins or between dolphins from different foraging classes. Furthermore, the dolphin social network was divided into three modules, clustering individuals that shared or lacked the cooperative foraging tactic. Space-use patterns were not sufficient to explain this partitioning, indicating a behavioural factor. The segregation of dolphins using different foraging tactics could result from foraging behaviour driving social structure, while the closer association between dolphins engaged in the cooperation could facilitate the transmission and learning of this behavi...Continue Reading

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Citations

Apr 10, 2013·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Mauricio Cantor, Hal Whitehead
Apr 4, 2014·PloS One·Simon J AllenNeil R Loneragan
Mar 13, 2014·Proceedings of the National Academy of Sciences of the United States of America·Karen McCombCynthia Moss
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Jun 9, 2021·Biological Reviews of the Cambridge Philosophical Society·Samin GokcekusJosh A Firth
Jul 27, 2021·Ecology and Evolution·Tui De RoyFritz Trillmich

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