Biological Diversity Study of Benthic Macroinvertebrates in Jiangsu Surface Water

Benthic macroinvertebrates community structure are closely related to water quality and aquatic ecosystem health.Its community structure change after affected by outside interference can reflet the nature and degree of water pollution.In 2008,benthic macroinvertebrates assemblages were collected from 154 sites in Jiangsu Province,including source of drinking water,t he Yangtze River and Beijing-Hangzhou Grand Canal and other major rivers,Taihu Lake and other key lakes.In source of drinking water,78 species were collected;in major rivers,96 species;n major lakes,65 species.From the evaluation results of species diversity index,the main lakes's benthic macroinvertebrates diversity was better than surface water sources and major rivers.The proportion of rich and less rich was 58%.The main rivers's diversity was the worst,the rich and more enrich proportion only 30.7%,and had 11.3 percent of points very poor,most of the water body 's zoobenthos were tolerance species,its dominant species was Limnodrilus hoffmeristeri.The water quality of main rivers was worse than drinking water sources and major lakes.