7个不同翘嘴红鲌群体的形态差异分析

应用聚类分析、主成分分析和判别分析三种多元分析方法,比较研究了翘嘴红鲌(Erythroculter ilishaefor-mis)7个不同群体间的形态差异。聚类分析结果表明,7个群体分为三支,南湾、兴凯湖、太湖和养殖群体之间的形态最为接近,首先聚为一支,梁子湖和三溪口群体聚为另一支,而浮桥河群体则相对独立为一支。三个分支中浮桥河群体与其他群体的亲缘关系相对较远。主成分分析显示,可量数据和框架数据等31项形态特征中头部和尾部的长度对各群体间的差异贡献率最大,其中,太湖、梁子湖和三溪口群体间的差异最为显著。以判别分析建立的判别函数,对7个不同群体的综合判别率为90%。分析结果显示翘嘴红鲌7个不同群体在形态上已产生一定程度的差异,应用三种多元分析方法可以将各群体有效地区分开来。

Analysis of Morphological Variations among Seven Populations of Erythroculter ilishaeformis

The morphological variations among seven populations of Erythroculter ilishaeformis were analyzed in three multivariation analysis methods based on 31 proportional parameters of morphometric characters.The results of cluster analysis have revealed that the seven populations were clustered into three clades.The first group included populations of Xingkaihu Lake,Taihu Lake,Nan Wan Reservoir and the artificial cultured population;Liangzihu Lake and Sanxikou Reservoir populations were clustered as the second group;the third group was the Fuqiaohe Reservoir population alone.Principal component analysis showed that there was the most contribution of principal components to total variances in the length of head and tail among the 31 proportional parameters metric characters and truss network.Discriminant analysis indicated that the total discriminant accuracy of the discriminant functions of these populations was 90%.All results showed that there were a certain extent differences among the seven populations and the seven populations could be identified in three multivariation analysis methods.