为了解滆湖浮游动物群落现状,于2009年5月至2010年3月对滆湖后生浮游动物群落结构特征和物种多样性进行调查.结果显示,滆湖后生浮游动物为100种,轮虫25属52种,枝角类12属21种,桡足类14属27种.后生浮游动物优势种主要有萼花臂尾轮虫(Brachionus calyciflorus)、角突臂尾轮虫(Brachionus angularis)、针簇多肢轮虫(Polyarthra trigla)、桡足幼体(copepodid)和长额象鼻潘(Bosmina longirostris).后生浮游动物年均密度为1572 L-1,轮虫数量占后生浮游动物总数的98.7％,后生浮游动物密度以春季为最大.后生浮游动物年均生物量为2.34 mg·L-1,生物量以夏季为最大,枝角类生物量与桡足类密度间呈极显著正相关(r=0.516,P＜0.01),轮虫生物量与桡足类生物量间呈显著负相关(r=-0.517,P＜0.05).滆湖后生浮游动物的密度和生物量随季节变化明显,各季节密度由大到小依次为春季、夏季、秋季和冬季,生物量由大到小依次为夏季、春季、秋季和冬季；后生浮游动物Shannon-Wiener多样性指数、Margalef丰富度指数和Pielou均匀度指数值表明滆湖水体处于轻-中污染状态.%Community structure and species diversity of metazoan zooplankton was investigated monthly from May 2009 to March 2010 in Gehu Lake. A total of one hundred species of metazoan zooplankton were found and identified as 52 species of Rotifera under 25 genera, 21 species of Cladocera under 12 genera, and 27 species of Copepoda under 14 genera. The community was dominated mainly by Brachionus calyciflorus, Brachionus angularis, Polyarthra trigla, copepodid and Bos-mina longirostris, with rotifera accounting for 98.7% of the total. The density of the zooplankton was 1 572 L-1 on average annually and peaked in spring, while the biomass of the zooplankton was 2.34 mg · L-1 on average annually and peaked in summer. The biomass of Cladocera was significantly and positively related to the density of Copepoda (r = 0.516, P < 0.01), whereas the biomass of Rotifera negatively related to the biomass of Copepoda. Density and biomass of the metazoan zooplankton varied sharply with the season, showing an descending order of spring, summer, autumn, and winter, and of summer, spring, autumn, and winter, respectively. The values of the Shannon-Wiener diversity index, Margalef species richness index and Pielou index indicate that the Gehu Lake was light to moderate in pollution.
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