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Provedor de dados:  ArchiMer
País:  France
Título:  Marine turtles use geomagnetic cues during open-sea homing
Autores:  Luschi, Paolo
Benhamou, Simon
Girard, Charlotte
Ciccione, Stéphane
Roos, David
Sudre, Joël
Benvenuti, Silvano
Data:  2007
Ano:  2007
Resumo:  Marine turtles are renowned long-distance navigators, able to reach remote targets in the oceanic environment; yet the sensory cues and navigational mechanisms they employ remain unclear [1-3]. Recent arena experiments indicated an involvement of magnetic cues in juvenile turtles' homing ability after simulated displacements [4, 5], but the actual role of geomagnetic information in guiding turtles navigating in their natural environment has remained beyond the reach of experimental investigations. In the present experiment, twenty satellite-tracked green turtles (Chelonia mydas) were transported to four open-sea release sites 100-120 km from their nesting beach on Mayotte island in the Mozambique Channel; 13 of them had magnets attached to their head [6] either during the outward journey or during the homing trip. All but one turtle safely returned to Mayotte to complete their egg-laying cycle, albeit with indirect routes, and showed a general inability to take into account the deflecting action of ocean currents as estimated through remote-sensing oceanographic measurements [7]. Magnetically treated turtles displayed a significant lengthening of their homing paths with respect to controls, either when treated during transportation or when treated during homing. These findings represent the first field evidence for the involvement of geomagnetic cues in sea-turtle navigation.
Tipo:  Text
Idioma:  Inglês

Editor:  Elsevier
Formato:  application/pdf
Fonte:  Current Biology (0960-9822) (Elsevier), 2007 , Vol. 17 , N. 2 , P. 126-133
Direitos:  2007 Elsevier Ltd All rights reserved

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