ACKNOWLEDGMENTS
We greatly appreciate all the individuals involved in the capture and
banding of A. erythropus that generated the data for this study.
We recognize the contributions of staffs from East Dongting National
Nature Reserve of China.
Funding statement : This study is supported by National Key
Research and Development Program of China (2017YFC0405300). Logistic and
transportation support to surveys in Chukotka was provided by Chukotka
Gold Mining Co, a subsidiary of Kinross Gold.
Ethics statement : All field methods used in this study were
approved by the Forestry Department of Hunan Province of China under
scientific research license (No.11 Xiang Forest Protection (2014)). Field
research was conducted with permission from the Bureau of East Dongting
National Nature Reserve.
Author contributions : L.G., D.S. and Z.Q. developed the study
design, D.S., G.D., S.V. participated the breeding surveys, and T.H. and
L.J. participated in the tracking at wintering sites, all authors were
involved in analyses and producing figures, D.S., Z.Q. L.W. and T.H.
drafted the manuscript, P.B and L. W. edited the manuscript, P.B. L.W.
and Z.Q. organized submission materials and revised the manuscript.
Data deposits : All data for analysis is available in Dryad.