摘要：2010年2月至3月，对太湖流域梁溪河水体中的浮游动物进行了调查。依据调查资料，分析研究了梁溪河春季浮游动物种类组成、优势种、生物量、密度、多样性指数、均匀度及其丰富度。共鉴定浮游动物54种，共1305只。轮虫类最多，共19种，占浮游动物物种数的35.19%，枝角类其次，共18种，占33.33%，桡足类17种，占31.48%。其中，优势种有萼花臂尾轮虫、剪形臂尾轮虫、曲腿龟甲轮虫、简弧象鼻溞、长额象鼻溞和直额裸腹溞。采用种类数、密度和生物量对梁溪河的水质状况进行评价表明，梁溪河水体为中营养水体，有朝富营养化发展的趋势。

关键词：浮游动物； 群落结构； 水质； 梁溪

Abstract: Zooplankton communities were investigated monthly (February-March 2010) in Liangxi River.Based on the investigation data,the species composition,dominant species,biomass,density, biodiversity index,evenness index and species richness index in Liangxi River were studied. A total of 54 species, among which, Rotifer was the main group, which contained 19 species (35.19% of the total species number).18 species of Cladocera(33.33%) and 17 species of Copepoda(31.48%) were observed. The dominant species were Brachionus calyciflorus,Brachionus forficula,Keratella valga, Bosmina coregon,Bosmina longirostris and Moina rectirosris. Based on the species number, density, and biomass of zooplankton, it had found that Liangxi River was in nutrition and it was inclined to be in eutrophic status. 

Key words: Zooplankton; Community structure; Water quality; Liangxi River