16 October 1998
Vol 282, Issue 5388

About The Cover

Cover image expansion

COVER Killer whales in the North Pacific. Recently increased predation by these apex predators has driven sea otter populations sharply downward, thus creating an ecological chain reaction in nearshore ecosystems. Dwindling harbor seal and Steller sea lion populations apparently induced killer whales to begin eating large numbers of sea otters. See page 473. [Photo: G. Ellis]