PHYSICAL HABITAT ASSESSMENT OF A REMAINING HIGH-BIODIVERSITY REACH OF THE UPPER YANGTZE RIVER, CHINA
文献类型： 外文期刊
作者： Zhang, H. 1 ; Wang, C. Y. 1 ; Wu, J. M. 1 ; Du, H. 1 ; Wei, Q. W. 1 ; Kang, M. 2 ;
作者机构： 1.Chinese Acad Fishery Sci, Yangtze River Fisheries Res Inst, Minist Agr China, Key Lab Freshwater Biodivers Conservat, 8 1st Wudayuan Rd, Wuhan 430223, Hubei Province, Peoples R China
2.Gyeongsang Natl Univ, Inst Marine Ind, Dept Maritime Police & Prod Syst, Cheondaegukchi Gil 38, Tongyeon
关键词： river habitat survey;echosounder;ADCP;river management;protected area
期刊名称：APPLIED ECOLOGY AND ENVIRONMENTAL RESEARCH （ 影响因子：0.711； 五年影响因子：0.796 ）
ISSN： 1589-1623
年卷期： 2016 年 14 卷 1 期
页码：
收录情况： SCI
摘要： A scientific assessment on the physical habitat of a river in the only remaining free-flowing stretch in the Upper Yangtze, which has one of the world's highest fish diversity and is critically important. A field survey was tentatively conducted in this non-wadeable and data-limited reach (392 km river length, its 98.3% included the national protected area) of the Upper Yangtze River using a 200 kHz echosounder and a 600 kHz Acoustic Doppler Current Profiler in 2011. The water depth, acoustic backscatter characteristics of river bottom (hardness and roughness), and flowing characteristics (depth-averaged velocity (DAV), Froude number (Fr), and Reynolds number (Re)), which are popular in describing the habitat preference of aquatic organisms, were determined to describe the river habitat properties. The K-means clustering method using parameters river thalweg depth, DAV, and Fr categorized the 392 river segments into three biological meaningful habitat types, pool, run and riffle, with occupied 5.4%, 30.1% and 64.5%, respectively. Thus, the pool was the most comparatively rare habitat type and should be carefully protected. This study provides a fast and efficient method for assessing the habitat characteristics of a non-wadeable and data-limited river, moreover, the results supply fundamental information for better national protected reach management.
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