About the Authors
- Steffen Oppel
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* E-mail: steffen.oppel@rspb.org.uk
Affiliation RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire, United Kingdom
- Piotr Marczakiewicz
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Affiliations Ogólnopolskie Towarzystwo Ochrony Ptaków, Marki, Poland, Biebrzański Park Narodowy, Osowiec Twierdza 8, Goniądz, Poland
- Lars Lachmann
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Affiliation RSPB Centre for Conservation Science, Royal Society for the Protection of Birds, The Lodge, Sandy, Bedfordshire, United Kingdom
- Grzegorz Grzywaczewski
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Affiliation University of Life Sciences, Department of Zoology, Animal Ecology and Wildlife Management, Lublin, Poland
Competing Interests
The authors have declared that no competing interests exist.
Author Contributions
Conceived and designed the experiments: SO LL PM. Performed the experiments: GG PM. Analyzed the data: SO. Contributed reagents/materials/analysis tools: SO. Wrote the paper: SO. Obtained permission and recruited fieldworker: PM GG. Obtained funding and managed project: LL. Commented on manuscript: LL PM GG.