大兴凯湖浮游动物群落结构及生物多样性

The population structure of zooplankton in Daxingkai Lake

于2001年5、7、9月份对大兴凯湖浮游动物的群落结构进行了研究,结果表明:浮游动物共计32种,以轮虫为主,占43 8%,原生动物占31 2%,枝角类、桡足类各占12 5%;浮游动物生物量为3 2377mg/L,其中,桡足类的生物量最高,占78 5%;浮游动物密度为3601个/L,主要是以原生动物为主,占79 9%。大兴凯湖浮游动物种类少,群落结构简单,优势种有焰毛虫Askenasiasp 、沙壳虫Difflugiasp 、曲腿龟甲轮虫Keratellavalga、英勇剑水蚤Cyclopsstrenuus。多样性指数为夏季>春季>秋季。

The population structure of zooplankton was investigated at Daxingkai Lake in May, July and September 2001. There were 32 species of zooplankton, in which rotifera (43.8%), protozoa (31.2%), cladocera and copepoda (25% ) were of the predominate. The biomass of zooplankton reached 3.2377mg/L, copepoda accounting for 78.6%, and the abundance of zooplankton was 3601 ind./L, including the predominate protozoa of 79.9%, indicating that there are a few zooplankton species such as Askenasia sp., Difflugia sp., Keratella valga and Cyclops strenuous in Daxingkai Lake. The diversity index was the maximuns in Summer, and the minimum in Autumn.