Our Disappearing Reef Sharks

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A new survey of nearly 400 coral reefs worldwide reveals sharks once common in those waters are vanishing, a troubling sign that they are at a much greater risk of going extinct than previously thought.

Populations of five common reef sharks have declined between 60 percent and 73 percent over the past half-century, a team of 150 researchers report in Science June 15.

"It's absolutely jaw-dropping," said Arizona State University's marine biologist David Shiffman. "If you look at all the reef sharks at all the reefs everywhere, you get a very similar pattern."...

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