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Using Hidden Markov Models to characterise intermittent social behaviour in fish shoals

Research output: Contribution to journalArticle

Original languageEnglish
Article number7
Number of pages13
JournalNaturwissenschaften
Volume105
Issue number1-2
Early online date27 Dec 2017
DOIs
DateAccepted/In press - 16 Dec 2017
DateE-pub ahead of print - 27 Dec 2017
DatePublished (current) - 1 Feb 2018

Abstract

The movement of animals in groups is widespread in nature. Understanding this phenomenon presents an important problem in ecology with many applications that range from conservation to robotics. Underlying all group movements are interactions between individual animals and it is therefore crucial to understand the mechanisms of this social behaviour. To date, despite promising methodological developments, there are few applications to data of practical statistical techniques that inferentially investigate the extent and nature of social interactions in group movement. We address this gap by demonstrating the usefulness of a Hidden Markov Model approach to characterise individual-level social movement in published trajectory data on three-spined stickleback shoals (Gasterosteus aculeatus) and novel data on guppy shoals (Poecilia reticulata). With these models, we formally test for speed-mediated social interactions and verify that they are present. We further characterise this inferred social behaviour and find that despite the substantial shoal-level differences in movement dynamics between species, it is qualitatively similar in guppies and sticklebacks. It is intermittent, occurring in varying numbers of individuals at different time points. The speeds of interacting fish follow a bimodal distribution, indicating that they are either stationary or move at a preferred mean speed, and social fish with more social neighbours move at higher speeds, on average. Our findings and methodology present steps towards characterising social behaviour in animal groups.

    Research areas

  • Animal movement, Behavioural states, Collective behaviour, Hidden Markov Model, Social interactions

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Springer at https://link.springer.com/article/10.1007%2Fs00114-017-1534-9 . Please refer to any applicable terms of use of the publisher.

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  • Supplementary information PDF

    Rights statement: This is the final published version of the article (version of record). It first appeared online via Springer at https://link.springer.com/article/10.1007%2Fs00114-017-1534-9 . Please refer to any applicable terms of use of the publisher.

    Final published version, 630 KB, PDF document

    Licence: CC BY

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