广西桂林青狮潭水库鱼类物种组成及多样性分析

2015年4月至2016年1月按季度对青狮潭水库库区鱼类资源进行了调查,采集鱼类样本3 750尾(153.28kg),经鉴定有鱼类32种,隶属于5目12科27属,其中以鲤形目鱼类为主,分别占总物种数和总个体数的53.13%和61.92%。相对重要性指数分析表明,鲫(Carassius auratus)、■(Hemiculter leucisculus)和鲤(Cyprinus carpio)为优势种;鱼类多样性分析结果显示,各季节丰富度指数(D)为2.58~3.52,Shannon-Wiener多样度指数(H')为1.62~1.92,Pielou种类均匀度指数(J')为0.53~0.63,其中夏季多样性最高、冬季相对较低;空间上,鱼类多样性呈现从河流入库口、近岛水区向湖心降低趋势。聚类及相似性分析(ANOSIM)表明,鱼类群落组成时空差异不明显。

Species composition and diversity of fish in Qingshitan Reservoir in Guilin,Guangxi

A survey of fish resources in Qingshitan Reservoir was conducted from April 2015 to January 2016.And 3 750 fish(153.28 kg)were collected,and 32 species belonging to 5 orders,12 families and 27 genera had been identified.Cypriniformes,which accounted for 53.13% of all species and 61.92% of all individuals,was the dominant fish fauna.According to the analysis of relative importance index (IRI),the most dominant species were Carassius auratus,Cyprinus carpio and Hemiculter leucisculus.The analysis of species diversity shows that Margalef index (D) was 2.58~3.52;the Shannon-Wiener species diversity index (H') was 1.62~1.92;the Pielou evenness index (J') was 0.53~0.63,which was the highest in summer but relatively lower in winter.The diversity of fish decreased from the mouths of streams,and from islands to the center of the reservoir.The result of species diversity analysis indicates that there was no significant difference in the fish communities among seasons and sampling sites.