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Study says whaling is reason for decline of many ocean species.
Byline: Glennda Chui
SAN JOSE, Calif. _ The slaughter of more than half a million whales in the North Pacific and Bering Sea set off an ecological chain reaction that is wiping out sea lions and kelp forests today, according to a controversial new report by researchers from Santa Cruz, Calif., Seattle and Alaska.
The loss of whales drove a fearsome ocean predator _ the killer whale _ to look for other creatures to eat, the researchers say. As a result, one species after another was driven to the brink of collapse over a period of decades and across a vast expanse of ocean.
This grim scenario, laid out in a report last week in the Proceedings of the National Academy of Sciences, is drawing both praise and criticism from scientists who have been puzzling over the decline of seals, sea lions and sea otters in northern waters.
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It lends weight to the idea that the loss of a species can work enormous havoc on an ecosystem, much as the removal of a keystone _ the wedge-shape stone atop an arch _ will cause that arch to crumble.
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