Behavioral context of call production by eastern North Pacific blue whales Oleson, EM ; Calambokidis, J. ; Burgess, WC ; McDonald, MA ; LeDuc, CA ; Hildebrand, JA Abstract Publication: Marine Ecology Progress Series Pub Date: January 2007 DOI: 10.3354/meps330269 Bibcode: 2007MEPS..330..269O