1. Harvard
University Center for the Environment, Harvard University, Cambridge, Massachusetts 02138, United States
2. School
of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York 11794, United States
3. Department
of Marine Sciences, University of Connecticut, 1080 Shenneconsett Road, Groton, Connecticut 06340, United States
4. Ocean Associates, Southwest
Fisheries Science Center, NMFS, NOAA, La Jolla, California 92037, United States
5. Southwest
Fisheries Science Center, National Marine Fisheries Service (NMFS), National Oceanic and Atmospheric Administration (NOAA), La Jolla, California 92037, United States
6. Channel Islands Cetacean Research Unit, Santa Barbara, California 93101, United States
7. Department
of Fisheries Science, Virginia Institute of Marine Science, Gloucester
Point, Virginia 23062, United States
8. Department
of Marine Biology, School of Marine Science and Technology, Tokai University, 3-20-1, Orido, Shimizu, Shizuoka 424-8610, Japan