State Key Laboratory of Urban and Regional Ecology Research Center for Eco‑Environmental Sciences Chinese Academy of Sciences Beijing 100085 China;
University of Chinese Academy of Sciences Beijing 100049 China;
School of Life Sciences University of Science and Technology of China Hefei 230026 China;
Department of Bioscience Aarhus University Aarhus Denmark;
Anas acuta; GPS/GSM telemetry; Mareca falcata; Mareca penelope; Winter residency time; Yangtze River Floodplain;