The latest salvo has been fired in a rancorous battle over the cause of steep declines in the north Pacific’s marine mammals. Back in 2003, Alan Springer of the University of Alaska Fairbanks and his colleagues proposed that commercial whaling had forced whale-eating killer whales to switch to other prey. This, they argue, triggered a ‘sequential megafaunal collapse’ as the killers first ate the harbour seals, then switched to fur seals, Steller sea lions and finally sea otters. (source: nature.com)
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