About the Authors

Philip N. Trathan, Peter T. Fretwell
British Antarctic Survey, Cambridge, United Kingdom

Bernard Stonehouse
Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom

Corresponding Author

p.trathan@bas.ac.uk

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.