勤得利湾浮游动物群落结构特征

Zooplankton composition in Qindeli Reservior

2003年5、7、9、11月对勤得利湾浮游动物的种类组成结构特征进行了研究。结果表明：浮游动物共计4门82种,以原生动物、轮虫为主,分别占29.27%和54.88%；前节晶囊轮虫、锥形似铃壳虫、螺形龟甲轮虫、尖削叶轮虫、萼花臂尾轮虫、多足变形虫、单缩虫等为优势种。浮游动物数量为27449.1 ind．/L,原生动物数量为11445 ind．/L,占41.7%；生物量为14.235 mg/L,轮虫最高,为11.002 mg/L。浮游动物季节变化比较明显,数量夏季最高为74431.2 ind．/L；生物量以夏季最高37.9056 mg/L；水平分布采样点Ⅲ最高,为42113.2 ind．/L和21.836 mg/L。勤得利湾浮游动物多样性指数变化是冬季＞春季＞秋季＞夏季。均匀度指数变化是秋季＞冬季＞春季＞夏季。

The species composition of zooplankton was investigated in Qindeli Reservior in May, July, September and November 2003. Results indicate： There were 82 species of zooplankton belonging to 4 phylums were found, in which protozoa （29. 27% ） and rotifer （54. 88% ） were predominant. Alpsanchna bulla Gosse, Tintinnopsis conicus Chiang , Keratella cochlearis （Gosse）, Notholca acuminate （Ehrenberg）, Amoeba pol , Carchesium polypinum Linn＇e , Brachionus calyciflorus Pallas were dominant species. The abundance of zoo- plankton was 8430ind. /L, The protozoa take the main part of 84. 52% in 7125ind. /L. The biomass of zooplankton can reach 1. 234mg/L in which Rotifer occupied the majority proportion in 0. 940mg/L. As the seasons changed, the variation of zooplankton was obvious. omass of zooplankton of 37. 91 mg/L appeared insummer, too. The abundance and biomass were respectively 42113. 2ind. /L and 21. 836mg/L. The variation of diversity index was Winter 〉 Spring 〉 Autumn 〉 Summer; and that of evenness index was Autumn 〉 Winter 〉 Spring 〉 Summer.