Bobbi Johnson

Columbia River Chinook salmon have lost as much as two-thirds of their genetic diversity, Washington State University researchers have found.

Writing in the journal PLOS One, the researchers say their analysis “provides the first direct measure of reduced genetic diversity for Chinook salmon from the ancient to the contemporary period.”

 “The big question is: Is it the dams or was it this huge fishing pressure when Europeans arrived?” said Bobbi Johnson, who did the study as part of her WSU doctorate in biological sciences. “That diversity could have been gone before they put the dams in.”

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