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Escape path complexity and its context dependency in Pacific blue-eyes (Pseudomugil signifer)
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Applied Mathematics and Statistics. Stockholm Univ, Dept Zool, S-10691 Stockholm, Sweden.ORCID iD: 0000-0003-0243-4518
Univ Sydney, Sch Life & Environm Sci, Sydney, NSW 2006, Australia.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Applied Mathematics and Statistics.
Univ Leeds, Sch Math, Dept Stat, Leeds LS2 9JT, W Yorkshire, England.
2017 (English)In: Journal of Experimental Biology, ISSN 0022-0949, E-ISSN 1477-9145, Vol. 220, no 11, p. 2076-2081Article in journal (Refereed) Published
Abstract [en]

The escape paths prey animals take following a predatory attack appear to be highly unpredictable - a property that has been described as 'protean behaviour'. Here, we present a method of quantifying the escape paths of individual animals using a path complexity approach. When individual fish (Pseudomugil signifer) were attacked, we found that a fish's movement path rapidly increased in complexity following the attack. This path complexity remained elevated (indicating a more unpredictable path) for a sustained period (at least 10 s) after the attack. The complexity of the path was context dependent: paths were more complex when attacks were made closer to the fish, suggesting that these responses are tailored to the perceived level of threat. We separated out the components of speed and turning rate changes to determine which of these components contributed to the overall increase in path complexity following an attack. We found that both speed and turning rate measures contributed similarly to an individual's path complexity in absolute terms. Overall, our work highlights the context-dependent escape responses that animals use to avoid predators, and also provides a method for quantifying the escape paths of animals.

Place, publisher, year, edition, pages
2017. Vol. 220, no 11, p. 2076-2081
Keywords [en]
Protean behaviour, Entropy, Escape behaviour
National Category
Zoology
Identifiers
URN: urn:nbn:se:uu:diva-360726DOI: 10.1242/jeb.154534ISI: 000402407900024PubMedID: 28348040OAI: oai:DiVA.org:uu-360726DiVA, id: diva2:1249110
Funder
Knut and Alice Wallenberg Foundation, 102 2013.0072Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2018-09-18Bibliographically approved

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Herbert-Read, James E.Sumpter, David J. T.

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