Navigation by green turtles: which strategy do displaced adults use to find Ascension Island?

Akesson, S., Broderick, A.C., Glen, F., Godley, B.J., Luschi, P., Papi, F. and Hays, G.C. 2003, Navigation by green turtles: which strategy do displaced adults use to find Ascension Island?, Oikos, vol. 103, no. 2, pp. 363-372, doi: 10.1034/j.1600-0706.2003.12207.x.

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Title Navigation by green turtles: which strategy do displaced adults use to find Ascension Island?
Author(s) Akesson, S.
Broderick, A.C.
Glen, F.
Godley, B.J.
Luschi, P.
Papi, F.
Hays, G.C.ORCID iD for Hays, G.C.
Journal name Oikos
Volume number 103
Issue number 2
Start page 363
End page 372
Total pages 10
Publisher Wiley
Place of publication London, England
Publication date 2003-11
ISSN 0030-1299
Summary Sea turtles are known to perform long-distance, oceanic migrations between disparate feeding areas and breeding sites, some of them located on isolated oceanic islands. These migrations demonstrate impressive navigational abilities, but the sensory mechanisms used are still largely unknown. Green turtles breeding at Ascension Island perform long oceanic migrations (>2200 km) between foraging areas along the Brazilian coast and the isolated island. By performing displacement experiments of female green turtles tracked by satellite telemetry in the waters around Ascension Island we investigated which strategies most probably are used by the turtles in locating the island. In the present paper we analysed the search trajectories in relation to alternative navigation strategies including the use of global geomagnetic cues, ocean currents, celestial cues and wind. The results suggest that the turtles did not use chemical information transported with ocean currents. Neither did the results indicate that the turtles use true bi-coordinate geomagnetic navigation nor did they use indirect navigation with respect to any of the available magnetic gradients (total field intensity, horizontal field intensity, vertical field intensity, inclination and declination) or celestial cues. The female green turtles successfully locating Ascension Island seemed to use a combination of searching followed by beaconing, since they searched for sensory contact with the island until they reached positions NW and N of the Island and from there presumably used cues transported by wind to locate the island during the final stages of the search.
Language eng
DOI 10.1034/j.1600-0706.2003.12207.x
Field of Research 069999 Biological Sciences not elsewhere classified
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2003, Wiley
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