About the Authors

Christine C Spencer

To whom correspondence should be addressed. E-mail: spencer@zoology.ubc.ca

¤ Current address: Department of Ecology and Evolutionary Biology, University of Toronto, Toronto, Ontario, Canada.

Affiliation Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada

Melanie Bertrand

Affiliation Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada

Michael Travisano

Affiliation Department of Biology and Biochemistry, University of Houston, Houston, Texas, United States of America

Michael Doebeli

Affiliations Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada , Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

CCS, MB, and MD conceived and designed the experiments. CCS and MB performed the experiments. CCS analyzed the data. MT and MD contributed reagents/materials/analysis tools. CCS and MD wrote the paper.