About the Authors

Keith A. Hobson

Keith.Hobson@ec.gc.ca

Affiliation Environment Canada, Saskatoon, Saskatchewan, Canada

Steven L. Van Wilgenburg

Affiliation Environment Canada, Saskatoon, Saskatchewan, Canada

Leonard I. Wassenaar

Affiliation Environment Canada, Saskatoon, Saskatchewan, Canada

Keith Larson

Affiliation Department of Zoology, Lund University, Lund, Scania, Sweden

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: KAH KL SLVW LIW. Analyzed the data: SLVW. Wrote the paper: KAH SLVW LIW KL. Stable isotope analysis: LIW.