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-   -   Evidence for Geomagnetic Imprinting as a Homing Mechanism in Pacific Salmon (http://hfboards.hockeysfuture.com/showthread.php?t=1344653)

Fugu 02-08-2013 01:58 AM

Evidence for Geomagnetic Imprinting as a Homing Mechanism in Pacific Salmon
Current Biology, 07 February 2013
Copyright 2013 Elsevier Ltd All rights reserved.



Nathan F. Putmanhttp://www.cell.com/images/REemail.gif, Kenneth J. Lohmann, Emily M. Putman, Thomas P. Quinn, A. Peter Klimley, David L.G. NoakesSee Affiliations
  • Highlights
  • Sockeye salmon use geomagnetic imprinting as a homing mechanism
  • The homing route of salmon is predicted by magnetic field drift (secular variation)

In the final phase of their spawning migration, Pacific salmon use chemical cues to identify their home river, but how they navigate from the open ocean to the correct coastal area has remained enigmatic [1]. To test the hypothesis that salmon imprint on the magnetic field that exists where they first enter the sea and later seek the same field upon return [2,3,4], we analyzed a 56-year fisheries data set on Fraser River sockeye salmon, which must detour around Vancouver Island to approach the river through either a northern or southern passageway [5,6]. We found that the proportion of salmon using each route was predicted by geomagnetic field drift: the more the field at a passage entrance diverged from the field at the river mouth, the fewer fish used the passage. We also found that more fish used the northern passage in years with warmer sea surface temperature (presumably because fish were constrained to more northern latitudes). Field drift accounted for 16% of the variation in migratory route used, temperature 22%, and the interaction between these variables 28%. These results provide the first empirical evidence of geomagnetic imprinting in any species and imply that forecasting salmon movements is possible using geomagnetic models.

I've always been fascinated by the entire life cycle, leaving the birth stream for years and then returning to spawn and die in the exact spot. Incredible.

Geomagnetic and chemical sensors.

No Fun Shogun 02-08-2013 11:08 AM

The more that I read about animals like migratory birds and salmon and whales and their incredible sense of direction, the more ashamed I get that I still need to plug in my GPS to go someplace I've been to a dozen times already.

If I were Columbus, I wouldn't have been able to find Portugal.

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