About the Authors
Protected Resources Division, Southwest Fisheries Science Center, National Marine Fisheries Service, National Oceanographic and Atmospheric Administration, La Jolla, California, United States of America
The authors have declared that no competing interests exist.
Conceived and designed the experiments: JPB. Performed the experiments: JPB. Analyzed the data: JEM. Contributed reagents/materials/analysis tools: JEM JPB. Wrote the paper: JEM.