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- W1998610760 abstract "Diverse ocean migrants, including some sea turtles, elephant seals, and salmon, begin life in particular reproductive areas along coastlines, disperse across vast expanses of sea, and then return as adults to their natal areas to reproduce [1Lohmann K.J. Hester J.T. Lohmann C.M.F. Long-distance navigation in sea turtles.Ethol. Ecol. Evol. 1999; 11: 1-23Crossref Scopus (90) Google Scholar, 2Quinn T.P. The Behavior and Ecology of Pacific Salmon and Trout. University of Washington Press, Seattle2005Google Scholar, 3McConnell B. Fedak M. Burton H.R. Engelhard G.H. Reijnders J.H. Movements and foraging areas of naïve, recently weaned southern elephant seal pups.J. Anim. Ecol. 2002; 71: 65-78Crossref Scopus (83) Google Scholar]. Little is known about how such marine animals guide themselves to the correct coastal region from hundreds or thousands of kilometers away and after absences ranging in duration from a few months to a decade or more. One hypothesis is that animals imprint on the magnetic field of their home area and use this information to return [1Lohmann K.J. Hester J.T. Lohmann C.M.F. Long-distance navigation in sea turtles.Ethol. Ecol. Evol. 1999; 11: 1-23Crossref Scopus (90) Google Scholar]. The Earth's field varies predictably across the globe, so different geographic areas are marked by distinctive magnetic fields that might, in principle, provide unique magnetic signatures for natal areas [4Lohmann K.J. Lohmann C.M.F. Putman N.F. Magnetic maps in animals: nature's GPS.J. Exp. Biol. 2007; 210: 3697-3705Crossref PubMed Scopus (178) Google Scholar]. A potentially serious complication for this hypothesis is that the Earth's field changes gradually over time [1Lohmann K.J. Hester J.T. Lohmann C.M.F. Long-distance navigation in sea turtles.Ethol. Ecol. Evol. 1999; 11: 1-23Crossref Scopus (90) Google Scholar, 4Lohmann K.J. Lohmann C.M.F. Putman N.F. Magnetic maps in animals: nature's GPS.J. Exp. Biol. 2007; 210: 3697-3705Crossref PubMed Scopus (178) Google Scholar], causing the magnetic signatures that define natal areas to slowly drift. This secular variation could make natal homing via magnetic imprinting impossible if the magnetic signatures moved too far from the natal area [1Lohmann K.J. Hester J.T. Lohmann C.M.F. Long-distance navigation in sea turtles.Ethol. Ecol. Evol. 1999; 11: 1-23Crossref Scopus (90) Google Scholar, 5Alerstam T. Hedenström A. Åkesson S. Long-distance migration: evolution and determinants.Oikos. 2003; 103: 247-260Crossref Scopus (704) Google Scholar, 6Courtillot V. Hulot G. Alexandrescu M. leMouë J.-L. Kirschvink J.L. Sensitivity and evolution of sea turtle magnetoreception: observations, modelling and constraints from geomagnetic secular variation.Terra Nova. 1997; 9: 203-207Crossref Scopus (22) Google Scholar]. To investigate whether magnetic imprinting is compatible with secular variation, we sought a species with a life history that poses challenges for the hypothesis, reasoning that if magnetic imprinting is consistent with natal homing under unfavorable circumstances, then it would also be plausible in most other cases. We chose the Kemp's ridley sea turtle (Lepidochelys kempii), an endangered species that ranges widely over the Gulf of Mexico, northern Caribbean, and the eastern U.S. coast, but returns to nest along a single, limited region of coastline in northern Mexico [7Plotkin P. Biology and Conservation of Ridley Sea Turtles. The Johns Hopkins University Press, Baltimore2007Google Scholar]. This species requires approximately 10–15 years to reach sexual maturity [7Plotkin P. Biology and Conservation of Ridley Sea Turtles. The Johns Hopkins University Press, Baltimore2007Google Scholar] and is thus absent from its natal area for much longer than animals such as salmon and elephant seals [2Quinn T.P. The Behavior and Ecology of Pacific Salmon and Trout. University of Washington Press, Seattle2005Google Scholar, 3McConnell B. Fedak M. Burton H.R. Engelhard G.H. Reijnders J.H. Movements and foraging areas of naïve, recently weaned southern elephant seal pups.J. Anim. Ecol. 2002; 71: 65-78Crossref Scopus (83) Google Scholar]. Given this long absence, the Kemp's ridley appears to be particularly susceptible to effects of secular variation if it relies on magnetic imprinting. The modeling results we report here show that the magnetic imprinting hypothesis can account for how the Kemp's ridley turtle returns to its natal region even after absences of a decade or more." @default.
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- W1998610760 date "2008-07-01" @default.
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- W1998610760 title "Compatibility of magnetic imprinting and secular variation" @default.
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- W1998610760 doi "https://doi.org/10.1016/j.cub.2008.05.008" @default.
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