Crucial sites and environmental variables for wintering migratory waterbird population distributions in the natural wetlands in East Dongting Lake, China
Crucial sites and environmental variables for wintering migratory waterbird population distributions in the natural wetlands in East Dongting Lake, China
复制标题
东洞庭湖自然湿地越冬迁徙水鸟种群分布的关键地点及环境变量
DOI：
10.1016/j.scitotenv.2018.11.185
复制
发表时间：
2019-03-10
影响因子：
9.8
通讯作者：
Xie, Yong-Hong
中科院分区：
文献类型：
--
作者：
Zou, Ye-Ai;Zhang, Ping-Yang;Xie, Yong-Hong
洞庭湖是中国的第二大淡水湖，也是东亚-澳大拉西亚航线上全球重要的候鸟越冬地点之一。洞庭湖湿地是候鸟越冬的关键地点和环境变量。本研究利用2003/2004-2016/2017年度(2003/2004-2016/2017)水鸟和栖息地普查资料，通过比较东洞庭湖不同自然湿地水鸟种群数量、取食行业和物种水平的差异，识别出越冬季节水鸟的关键栖息地，并通过分析水鸟种群与环境变量的关系，确定了影响水鸟分布的关键环境变量，包括植被面积、滩涂面积、0~20 cm水域、20~50 cm水域、50~100 cm水域、深度>水域；100 cm，植被生长状况(最小、平均和最大NDVI)，以及人为干扰。结果表明，大小溪、春风、白湖、丁子堤和谭家围子5个天然湿地是东洞庭湖候鸟的重要越冬地点。在所选择的10个环境变量中，0-20 cm、20-50 cm和>；100 cm水域、人类干扰、最小值和平均NDVI被确定为总体上的关键环境变量。不同水平的水鸟与某些环境变量呈显著的线性关系，除豆雁和小白额鹅在物种水平上呈正态分布外，其平均NDVI随NDVI的变化呈正态分布。关键的环境变量似乎是特定于行业和物种的觅食。这些发现为管理者了解东洞庭湖湿地和水鸟种群的差异和做出更有针对性的保护工作提供了重要信息。(C)2018爱思唯尔B.V.保留所有权利。
Dongting Lake is the second largest freshwater lake in China and is one of the globally important wintering sites for migratory waterbirds in the East Asian-Australasian Flyway. Crucial sites and environmental variables for wintering migratory waterbirds are of great concern in the Dongting Lake wetlands. In this research, based on annual (2003/2004-2016/2017) waterbird and habitat census data, we recognized the crucial sites for waterbirds during wintering seasons by comparing the difference of waterbird populations at the community, foraging guild and species levels in different natural wetlands within East Dongting Lake, and then identified the crucial environmental variables affecting waterbird distributions by analyzing the relationship between waterbird populations and the environmental variables, including vegetation area, mudflat area, water area with the depth of 0-20 cm, water area with the depth of 20-50 cm, water area with the depth of 50-100 cm, water area with the depth > 100 cm, growth status of vegetation (Min, Mean and Max NDVI), and the human disturbance. Results indicated that five natural wetlands, i.e., Daxiaoxi, Chunfeng, Baihu lakes, Dingzi dyke and Tanjiaweizi, were recognized as the crucial wintering sites for migratory waterbirds in the East Dongting Lake. Among the ten selected environmental variables, water areas with the depth of 0-20 cm, 20-50 cm and > 100 cm, human disturbance, Min and Mean NDVIs were identified as the crucial environmental variables overall. Waterbirds at different levels exhibited significant linear relationship with certain environmental variables, with the exception of Bean goose and Lesser White-fronted goose at the species level, which showed Gaussian distribution with changes in mean NDVI. The crucial environmental variables appeared to be foraging guild- and species-specific. These findings provide significant information for managers to understand the differences of wetlands and waterbird populations within East Dongting Lake, and to make more targeted conservation efforts. (C) 2018 Elsevier B.V. All rights reserved.