江湖阻隔对短吻间银鱼空间发生格局的影响.pdf

江湖阻隔对短吻间银鱼空间发生格局的影响.pdf

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江湖阻隔对短吻间银鱼空间发生格局的影响

2005, 13 (5): 407415 doi: 10.1360/biodiv.050019 Biodiversity Science http : // 1,2 1 1* 1* 1(, 100871) 2(, 100037) : 200 1–200386, (Hemisalanx brachyrostralis), , , (21.3%), , , ; , , : , , , , Hemisalanx brachyrostralis, Impact of river-lake isolation on the spatial distribution pattern of Hemisalanx brachyrostralis 1,2 1 1* 1* Zhongsuo Wang , Cai Lu , Chongren Xu , Guangchun Lei 1College of Life Sciences, Peking University, Beijing 100871 2College of Life Sciences, Capital Normal University, Beijing 100037 Abstract During 2001–2003, we conducted a survey on icefish resources in the Yangtze River basin, aiming to find out the impacts of habitat fragmentation on the population structure and dynamics of the species Hemisalanx brachyrostralis. By investigating the presence/absence of the target species in 86 water bodies, we analysed its temporal-spatial distribution patterns in relation to two important habitat parameters—water area and isolation. The results indicated that this species was mainly distributed in lakes affiliated with the mid-lower reaches of the Yangtze River, showing low incidence of occurrence (IO=2 1.3%, annual

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