长江流域若干水体寡毛类区系组成及相似性分析

研究了长江流域十余个水体水栖寡毛类的区系组成及分布。共鉴定水栖寡毛类53种,隶3科27属,其中仙女虫科15属31种(占58.49%);颤蚓科11属20种(占37.74%);线蚓科1属2种(占3.77%).在河流、草型湖泊和藻型湖泊这三类水体中,以草型湖泊的物种数最多,达36种;其次为长江干流,34种;藻型湖泊仅24种。对寡毛类的种间关系及不同生境寡毛类种类组成的相似性进行了聚类分析,结果表明,寡毛类的种类分布具有明显的地域性,据此可将其划分为6类(A-F组).  

COMPOSITION AND FAUNAL SIMILARITY OF AQUATIC OLIGOCHAETES IN DIFFERENT WATERS IN THE CHANGJIANG RIVER BASIN

The species composition and distribution of aquatic oligo chaetes in 15 waters in the Changjiang River Basin were analyzed in this paper. A ltogether 53 species belonging to 3 families and 27 genera were reported. Among them were 31 species of Naididae, 20 species of Tubificidae and 2 species of Enc hytraeidae. Among the three types of waters, the number of species of oligochaet es in macrophytic lakes, mainstream of the Changjiang River and algal lakes are 36, 34 and 24 respectively. The cluster analysis (Euclidean distances) of specie s and faunal similarity of oligochaetes in 15 different waters were calculated. The results reveal that the aquatic oligochaetes are apparently distributed r egionally, and the total species can be distinctly divided into 6 groups.