sustainability Article Changing Abundance and Distribution of the Wintering Swan Goose Anser cygnoides in the Middle and Lower Yangtze River Floodplain: An Investigation Combining a Field Survey with Satellite Telemetry An An 1,2, Lei Cao 1,2,*, Qiang Jia 3, Xin Wang 1, Qin Zhu 3, Junjian Zhang 1,2, Xueqin Ye 1,2 and Dali Gao 4 1 State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100088, China;
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[email protected]; Tel.: +86-10-6284-9161 Received: 23 November 2018; Accepted: 1 March 2019; Published: 6 March 2019 Abstract: Migratory waterbird communities are quick to respond to ecosystem degradation, and they are widely considered to be important bioindicators of complex environmental changes. The swan goose (Anser cygnoides) has been listed as a globally vulnerable species in the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. This species currently winters almost exclusively in China and is mostly concentrated on lakes in the middle and lower catchment of the Yangtze River floodplain, especially in Poyang Lake, Jiangxi province and some sites in Anhui province.