西湖引水治理后的底栖动物群落

１９９５年１月－１９９６年１２月对西湖底栖大型无脊椎动物群落进行了连续监测与研究，共发现大型底栖无脊椎动物２６种，其中寡毛类６种，多毛类１种，水生昆虫９种，蛭类，线虫和无节蠕虫各１种。

Macrozoobenthos communities of West Lake after drawing fresh water from Qiantang River

During the beginning of 1995 to the end of 1996, macrozoobenthos communities of West Lake were investigated monthly. Samples were collected from four sampling stations. 26 species of macrozoobenthos were recorded. The annual average number of individual were 980~2751 ind. /m2, biomass were 19. 69~ 122. 80 g/m2.In Xiaonan Lake Area, Precludius choreus was dominant species in density, Bellamya purificata was dominant species in biomass. In other areas, Limnodrilus hoffmeisteri and Tokunagayusurika akamusi were dominant species in density, Branchiura sowerbyi and Tokunagayusurika akamusi were dominant species in biomass. Comparing with that before drawing the fresh water from Qiantang River, the water quality of Xiaonan Lake Area was improved and macrozoobenthos communities had succission. In other areas, the water quality was not improved. According to the Margalef index and Goodnight-Whitley index, West Lake is still a eutrophication lake.