Diatom indicative species of eutrophication of the lakes in the middle and lower reach regions of Yangtze River

Based on the investigation of distribution and many seasonal water samples in the surface sediment of 45 lakes in the middle and lower reaches regions of Yangtze River, the ecological characters of total phosphorus of indexes of 57 common diatom species were studied. The ecological best values and tolerance range of these common species were calculated using weighted average regression method. Combined with the ecological theory, the species of Cyclotella meneghiniana、C. atomus、Stephanodiscus parvus、S. minutulus、Navicula subminiscula exhibit to be very good indicators for the outbreak of lakes’ eutrophication in the middle and lower reaches of Yangtze River; while species of Aulacoseira alpigea、Cyclostephanos dubius、C. tholiformis、C. invisitatus、Stephanodiscus hantzschii、Navicula cirtrus、Nitzschia agnita、N. subacicularis were the potential lake eutrophication indicative species.