Map Showing Vancouver and Pacific Ocean and Arrows Indicating Southern and Northern Route of Salmon (IMAGE)

U.S. National Science Foundation

Map Showing Vancouver and Pacific Ocean and Arrows Indicating Southern and Northern Route of Salmon

Caption

The proportion of salmon using the northern versus southern passage to the Fraser River in British Columbia, Canada, could be largely predicted by the magnetic fields of these passages; the closer the magnetic field at a passage entrance matched the field at the river mouth years before when the fish originally swam through it, the more fish used the passage.

Credit

Nathan Putman, Oregon State University

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