三峡库区26条支流浮游甲壳动物的群落结构

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

2010年4月至2011年6月分4次对三峡库区26条支流及长江干流浮游甲壳动物群落结构进行调查,采集浮游甲壳类的定量和定性标本,共计152个采样点。结果表明,4次采样共鉴定出浮游甲壳动物50种,其中枝角类34种,桡足类16种。浮游甲壳类以常见的广温性种类为主,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和纵向分布特征,春季的现存量和种类明显高于冬季,相同支流上游的现存量和种类一般低于回水区。

In order to investigate the crustacean zooplankton community structure of the major tributaries in Three Gorges Reservoir Area（TGRA）,four times samplings in 26 tributaries of TGAR were carried out from April 2010 to June 2011.152 samples were identified and 50 species were collected,including 34 species of cladocera,and 16 species of copepod.The major species of the crustacean zooplankton could live in the wide temperature.And all of species were common in Yangtze River.Species composition,distribution and density of planktonic crustacean showed significant seasonal and spatial variations.The densities and species numbers in Spring were higher than those in Winter obviously.The densities and species numbers in upstream of tributaries were generally lower than those in back water region.