About the Authors
Department of Zoology, University of British Columbia, Vancouver, British Columbia, Canada
Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada
The authors have declared that no competing interests exist.
The author(s) have made the following declarations about their contributions: Conceived and designed the experiments: MDH MD. Performed the experiments: MDH. Analyzed the data: MDH MD. Contributed reagents/materials/analysis tools: MD. Wrote the paper: MDH MD.