长江常熟段定置张网渔获物组成及多样性季节变化分析

对2010年长江常熟江段定置张网渔获物组成及多样性季节变化进行了研究。该江段共有鱼类60种，分别隶属于12目25科。鲤形目鱼类最多，其次是鲈形目。各季节鱼类优势种以常见种为主，季节性种类相对较少，群落种间组成比较均匀，单个品种的优势度不突出。基于个体数量的优势度曲线表明，季节间种类优势度变化不明显，春季和夏季的优势度最接近。在4个季节的调查中，鱼类多样性指数H为2.30-2.49，多样性水平较高，季节间多样性指数变化不大。探讨了水利调度及增殖放流对该江段鱼类群落结构的影响。

Study on Catch Composition and Diversity Seasonal Change of Set Net in Changshu Section of the Yangtze River

Base on the catch data of set net in 2010,study on fish composition and seasonal change of diversity was carried out in Changshu section of the Yangtze River.Fishes of 12 orders,25 families and 60 species were collected in this area.Number of species belonging to Cypriniformes was the most and the second was fishes belonging to Perciformes.In each season,dominant species was mainly common fishes but not seasonal species.There was a good equilibrium among species and species with high dominance had not be di...