About the Authors

C. William Birky Jr

birky@u.arizona.edu

Affiliation Department of Ecology and Evolutionary Biology, The University of Arizona, Tucson, Arizona, United States of America

Competing Interests

The author has declared that no competing interests exist.

Author Contributions

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