About the Authors

Robert G. Wallace

To whom correspondence should be addressed. E-mail: rwallace@uci.edu

Affiliation Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, California, United States of America

Walter M. Fitch

Affiliation Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, California, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: WF RW. Performed the experiments: RW. Analyzed the data: RW. Contributed reagents/materials/analysis tools: WF RW. Wrote the paper: WF RW.