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Northern versus southern passage to the Fraser River in British Columbia
02/08/13

 

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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