01 April 2011
Vol 332, Issue 6025

About The Cover

Cover image expansion

COVER Adult sockeye salmon (weight ~2.5 kg; length ~60 cm) migrating to spawning grounds in the Adams River, British Columbia, Canada. Sockeye salmon populations in the Fraser River, British Columbia, are physiologically adapted to their specific upriver migration conditions. In a Report on page 109, Eliason et al. suggest that cardiac adaptations help protect one salmon population from cardiac collapse at high temperatures. Photo: Robert Polo;