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Efficiency of island homing by sea turtles under multimodal navigating strategies

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  • Painter, K.J.
  • Plochocka, A.Z.

Abstract

A dot in the vastness of the Atlantic, Ascension Island remains a lifelong goal for the green sea turtles that hatched there, returning as adults every three or four years to nest. This navigating puzzle was brought to the scientific community's attention by Charles Darwin and remains a topic of considerable speculation. Various cues have been suggested, with orientation to geomagnetic field elements and following odour plumes to their island source among the most compelling. Via a comprehensive in silico investigation we test the hypothesis that multimodal cue following, in which turtles utilise multiple guidance cues, is the most effective strategy. Specifically, we combine agent-based and continuous-level modelling to simulate displaced virtual turtles as they attempt to return to the island. Our analysis shows how population homing efficiency improves as the number of utilised cues is increased, even under “extreme” scenarios where the overall strength of navigating information decreases. Beyond the paradigm case of green turtles returning to Ascension Island, we believe this could commonly apply throughout animal navigation.

Suggested Citation

  • Painter, K.J. & Plochocka, A.Z., 2019. "Efficiency of island homing by sea turtles under multimodal navigating strategies," Ecological Modelling, Elsevier, vol. 391(C), pages 40-52.
    • Handle: RePEc:eee:ecomod:v:391:y:2019:i:c:p:40-52
    DOI: 10.1016/j.ecolmodel.2018.10.025
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    References listed on IDEAS

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    1. Donald R Kobayashi & Richard Farman & Jeffrey J Polovina & Denise M Parker & Marc Rice & George H Balazs, 2014. "“Going with the Flow” or Not: Evidence of Positive Rheotaxis in Oceanic Juvenile Loggerhead Turtles (Caretta caretta) in the South Pacific Ocean Using Satellite Tags and Ocean Circulation Data," PLOS ONE, Public Library of Science, vol. 9(8), pages 1-14, August.
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    3. Berens, Philipp, 2009. "CircStat: A MATLAB Toolbox for Circular Statistics," Journal of Statistical Software, Foundation for Open Access Statistics, vol. 31(i10).
    4. Kenneth J. Lohmann & Catherine M. F. Lohmann & Llewellyn M. Ehrhart & Dean A. Bagley & Timothy Swing, 2004. "Geomagnetic map used in sea-turtle navigation," Nature, Nature, vol. 428(6986), pages 909-910, April.
    5. Henrik Mouritsen, 2018. "Long-distance navigation and magnetoreception in migratory animals," Nature, Nature, vol. 558(7708), pages 50-59, June.
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    1. Petsas, Panagiotis & Tzivanopoulou, Marianna & Doxa, Aggeliki & Sailley, Sévrine F. & Mazaris, Antonios D., 2023. "Climate change on sea currents is not expected to alter contemporary migration routes of loggerhead sea turtles," Ecological Modelling, Elsevier, vol. 475(C).

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