A great white shark named Nicole logged more than 12,000 miles swimming from Africa to Australia and back, the first proof of a link between the two continents' shark populations, researchers say.
A second report details the movement of dozens of salmon sharks from summer waters near Alaska to warmer winter quarters off Hawaii and Baja California.
"Sharks have home ranges that are at the scale of ocean basins," said researcher Barbara A. Block of Stanford University. She added that conservation management of sharks such as the white shark and salmon shark will require international cooperation.
Tracking a shark from Africa to Australia "is one of the most significant discoveries about white shark ecology and suggests we might have to rewrite the life history of this powerful fish," said Ramon Bonfil, lead author of that study.
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