About the Authors
Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, New York, United States of America
United States Geological Survey Western Ecological Research Center, Marine Science Institute, University of California, Santa Barbara, Santa Barbara, California, United States of America
The authors have declared that no conflicts of interest exist.
JRW performed the experiments, analyzed the data, and wrote the paper. KDL conceived and designed the experiments and wrote the paper.