1. Department of Integrative Biology Oregon State University Corvallis Oregon 97331‐2914 USA
2. San Francisco Estuary Institute 4911 Central Avenue Richmond California 94804 USA
3. Vantuna Research Group Occidental College 1600 Campus Road Los Angeles California 90041 USA
4. Joint Institute for the Study of the Atmosphere and the Ocean University of Washington Seattle Washington 98115 USA
5. Marine Mammal Laboratory Alaska Fisheries Science Center NOAA Seattle Washington 98105 USA
6. Fenner School of Environment and Society The Australian National University B48 Linnaeus Way Acton Australian Capital Territory 2601 Australia