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Science 12 October 2001: Vol. 294. no. 5541, pp. 364 - 366 DOI: 10.1126/science.1064557
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Reports
Regional Magnetic Fields as Navigational Markers for Sea Turtles
Kenneth J. Lohmann,*
Shaun D. Cain,
Susan A. Dodge,
Catherine M. F. Lohmann
Young loggerhead sea turtles (Caretta caretta) from
eastern Florida undertake a transoceanic migration in which they
gradually circle the north Atlantic Ocean before returning to the North American coast. Here we report that hatchling loggerheads, when exposed
to magnetic fields replicating those found in three widely separated
oceanic regions, responded by swimming in directions that would, in
each case, help keep turtles within the currents of the North Atlantic
gyre and facilitate movement along the migratory pathway. These results
imply that young loggerheads have a guidance system in which regional
magnetic fields function as navigational markers and elicit changes in
swimming direction at crucial geographic boundaries.
Department of Biology, University of North Carolina, Chapel Hill,
NC 27599, USA.
*
To whom correspondence should be addressed. E-mail:
klohmann{at}email.unc.edu
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