Orientation of hatchling loggerhead sea turtles to regional magnetic fields along a transoceanic migratory pathway ...
SUMMARY Young loggerhead sea turtles (Caretta caretta) from the east coast of Florida, USA, undertake a transoceanic migration around the North Atlantic Gyre, the circular current system that flows around the Sargasso Sea. Previous experiments indicated that loggerhead hatchlings, when exposed to ma...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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The University of North Carolina at Chapel Hill University Libraries
2011
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| Online Access: | https://dx.doi.org/10.17615/9v87-pj96 https://cdr.lib.unc.edu/concern/articles/s1784v81r |
| Summary: | SUMMARY Young loggerhead sea turtles (Caretta caretta) from the east coast of Florida, USA, undertake a transoceanic migration around the North Atlantic Gyre, the circular current system that flows around the Sargasso Sea. Previous experiments indicated that loggerhead hatchlings, when exposed to magnetic fields replicating those that exist at five widely separated locations along the migratory pathway, responded by swimming in directions that would, in each case, help turtles remain in the gyre and advance along the migratory route. In this study, hatchlings were exposed to several additional magnetic fields that exist along or outside of the gyre9s northern boundary. Hatchlings responded to fields that exist within the gyre currents by swimming in directions consistent with their migratory route at each location, whereas turtles exposed to a field that exists north of the gyre had an orientation that was statistically indistinguishable from random. These results are consistent with the hypothesis that ... |
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