湘江衡阳段软体动物的多样性调查

Species Diversity of Mollusca in the Hengyang Reaches of Xiang River

研究了湘江衡阳江段软体动物的物种多样性．共鉴定软体动物42种，分别隶属于9科20属，其中主要是田螺科和蚌科的种类．10个生境的物种丰富度指数DMA的取值范围在19．914～15．444，Shannon-Wiener多样性指数H’的范围在1．327～0．953，均匀度指数Jsw为0．955～0．836．根据不同生境物种的相似性系数C进行系统聚类分析，10个生境在相似性系数0．5743的水平时全部聚合在一起．

The species composition and diversity of molluscas in the Hengyang reaches of Xiang River are studied. There are 42 species belonging to 9 families and 20 are genera. Most of them are representatives of the family Viviparidae and Unionidae. The diversity measurements of molluscas in ten different habitats show that the values of species richness index DMA range from 19.914 to 15.444. ; species diversity index H＇ range from 1.327 to 0.953; and evenness indexing Jsw range from 0.955 to 0.836. Based on similarity coefficients C ,ten habitats can duster at the level of 0.574 3 with the systematic clustering.