三峡库区26条支流浮游甲壳动物的群落结构

为了对三峡库区26条主要河流及长江干流浮游甲壳动物群落结构进行调查，2010年4月至2011年6月分四次对三峡库区主要河流进行浮游甲壳类进行定量和定性采集标本。152个采样点四次采样共鉴定出浮游甲壳动物50种，其中枝角类36种，桡足类14种。浮游甲壳类主要是以常见的广温性种类为主，四次调查中发现的种类均为长江流域常见种。三峡库区浮游甲壳类动物具有明显的季节性变化特征，四月份（春夏季）的存量和种类明显高于十月份（秋冬季）；也具有明显的纵向分布特征，相同支流上游的存量和种类一般低于回水区的数值。

The Crustacean Zooplankton Community Structure in 26 Tributaries of Three Gorges Reservoir Area

In order to study planktonic crustacean community structure of 26 major rivers in three gorges, we surveyed the seasonal variation and spatial distribution of planktonic crustacean from April 2010 to June 2011 in three gorges reservoir. 152 sampling points were identified and 50 species were collected, including 36 species of cladocera, and 14 species of copepod. Wide temperature kinds of planktonic crustacean occupy the main position , and all spicies of planktonic crustacean in four times survey were common species in the Yangtze river aera. Species composition, distribution and density of planktonic crustacean showed significant seasonal vatiation .The density and species in April was higher than those in October obviously .The planktonic crustacean density also showed a gradient with the distance from upstream to downstream : the density and species in upstream were generally lower than those in downstream.