About the Authors

J. Marion Adeney

Affiliation Nicholas School of the Environment, Duke University, Durham, North Carolina, United States of America

Norman L. Christensen Jr

Affiliation Nicholas School of the Environment, Duke University, Durham, North Carolina, United States of America

Stuart L. Pimm

stuartpimm@aol.com

Affiliation Nicholas School of the Environment, Duke University, Durham, North Carolina, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JMA NLC SLP. Analyzed the data: JMA SLP. Wrote the paper: JMA NLC SLP.