Winter Population Status and Endangered Factors of Scaly-sided Merganser(Mergus squamatus) in Jiangxi Province
Winter Population Status and Endangered Factors of Scaly-sided Merganser(Mergus squamatus) in Jiangxi Province
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发表时间：
2010
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通讯作者：
Zhao Jian
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作者：
Zhao Jian
鳞边秋沙鸭的冬季种群状况2009年2月，对江西省赣江、抚河、信江、饶河和秀水河5条主要河流中的中华秋沙鸭（Mergussquamatus）进行了调查，分析了其种群数量、性比、空间分布、生境特征及其濒危因素。采用样线法，在研究区约400 km的范围内进行了调查，并沿各样线进行了沿着调查。结果表明，江西省越冬的中华秋沙鸭共有26个类群，共255只，性比为119：1。117，鳞边秋沙鸭组的性比约为1：1.除赣江外，其余4条河流均有越冬的鳞脚秋沙鸭，在近年来有越冬鳞脚秋沙鸭群记录的婺源、贵溪、益阳、浮梁、修水等地均有越冬的鳞脚秋沙鸭群，在宜黄、武宁、龙虎山等地也首次发现越冬的鳞脚秋沙鸭群，其中以龙虎山地区的个体数最多（53只）。水污染和非法捕捞是威胁江西越冬种群的主要因素。
The winter population status of the scaly-sided merganser(Mergus squamatus) was studied in 5 major rivers:Ganjiang River,Fuhe River,Xinjiang River,Raohe River,and Xiushui River in Jiangxi Province in February,2009.The population size,sex ratio,spatial distribution,habitat characteristic,and factors contributing to its endangerment were analyzed.Using the line transect method,we surveyed about 400 km in the study area,and simultaneously conducted the survey along each transect.The results showed that there were 26 groups of scaly-sided mergansers wintering in Jiangxi Province,a total of 255 individuals recorded in the study.The sex ratio was 119:117,and the sex ratio of the scaly-sided merganser group was about 1:1.Except for the Ganjiang River,we found the wintering scaly-sided merganser in other 4 rivers involved.We not only recorded the wintering scaly-sided merganser group in Wuyuan,Guixi,Yiyang,Fuliang,and Xiushui where wintering scaly-sided merganser groups have been recorded in recent years,but also found them wintering in Yihuang,Wuning and Longhushan region for the first time.Furthermore,the group of scaly-sided mergansers in the Longhushan region had the largest number of individuals(53) in this study.Sand quarries,water pollution and illegal fishing were the major factors threatening the wintering population in Jiangxi Province.