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

Theunis Piersma

Affiliations Centre for Ecological and Evolutionary Studies, University of Groningen, Groningen, Groningen, The Netherlands, Department of Marine Ecology, Royal Netherlands Institute for Sea Research, Den Burg, Texel, The Netherlands

Leonard I. Wassenaar

Affiliation Environment Canada, Saskatoon, Saskatchewan, Canada

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: TP KAH. Analyzed the data: SVW TP. Wrote the paper: KAH SVW TP LIW. Collected field samples: TP. Conducted isotope analyses: LIW.