Analysis of foraging movements of Atlantic bluefin tuna (<Emphasis Type="Italic">Thunnus thynnus</Emphasis>): individuals switch between two modes of search behaviour |
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Authors: | Nathaniel K Newlands Molly E Lutcavage Tony J Pitcher |
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Institution: | (1) Department of Mathematics, University of British Columbia, 1984 Mathematics Rd., Vancouver, B.C., V6T 1Z2, Canada;(2) Department of Zoology, University of New Hampshire, Durham, NH, USA;(3) Fisheries Centre, University of British Columbia, Vancouver, B.C., Canada |
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Abstract: | We investigate the application of quantitative techniques for distinguishing adaptive search behaviour in Atlantic bluefin tuna (Thunnus thynnus). The analysis demonstrates the application of a novel spectral analysis technique for resolving and measuring periodicity in animal behaviour patterns. Two different search strategies are identified that include regulation of turning (klinokinesis) and speed (orthokinesis). Our results provide evidence that bluefin tuna attempt to optimize their searching efficiency through adjustments in the duration and timing of switching between these two searching strategies. Repetitive, diurnal deep dives were also found to coincide with switching of search behaviour. Additional tracking experiments with larger sample sizes are needed to better identify how individuals switch between the two search strategies and how such decisions may collectively improve the searching and foraging efficiency of their schools (synchrokinesis, social taxis) in response to changes in the size or composition of prey aggregations. |
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Keywords: | Klinokinesis Non-stationary Orthokinesis Search behaviour Spectral method |
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