About the Authors

Philip N. Trathan

p.trathan@bas.ac.uk

Affiliation British Antarctic Survey, Cambridge, United Kingdom

Peter T. Fretwell

Affiliation British Antarctic Survey, Cambridge, United Kingdom

Bernard Stonehouse

Affiliation Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

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