About the Authors

Erich Bächler

erich.baechler@vogelwarte.ch

Affiliation Swiss Ornithological Institute, Sempach, Switzerland

Steffen Hahn

Affiliation Swiss Ornithological Institute, Sempach, Switzerland

Michael Schaub

Affiliations Swiss Ornithological Institute, Sempach, Switzerland, Institute of Ecology and Evolution, Conservation Biology, University of Bern, Bern, Switzerland

Raphaël Arlettaz

Affiliations Swiss Ornithological Institute, Sempach, Switzerland, Institute of Ecology and Evolution, Conservation Biology, University of Bern, Bern, Switzerland

Lukas Jenni

Affiliation Swiss Ornithological Institute, Sempach, Switzerland

James W. Fox

Affiliation British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom

Vsevolod Afanasyev

Affiliation British Antarctic Survey, Natural Environment Research Council, Cambridge, United Kingdom

Felix Liechti

Affiliation Swiss Ornithological Institute, Sempach, Switzerland

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: EB SH FL. Performed the experiments: EB. Analyzed the data: EB. Contributed reagents/materials/analysis tools: JWF VA. Wrote the paper: EB SH MS RA LJ JWF VA FL.