不同水域克氏原螯虾群体的形态差异分析

Morphological variations of six different waters populations of Procambarus clarkii

采用3种多元统计方法对6个不同自然水域的克氏原螯虾群体22个性状比例参数进行差异性分析。聚类分析结果表明洪泽湖、射阳群体与其他群体差异程度较大,微山湖、长江、鄱阳湖、安徽四个群体差异程度较小。主成分分析结果表明,雌性方差贡献率群体主成分分别为35.060%、19.371%、13.714%、7.303%,累积贡献率为75.448%。雄性群体主成分分别为46.188%、13.080%、11.496%、6.785%,累积贡献率为77.549%,第二步足长和第五步长2个因素对不同地区克氏原螯虾的形态差异是有显著影响的。判别分析结果表明,雌性群体判别准确率P1为78.9%-92.1%,P2为76.6%-90.0%,综合判别率为85.0%;雄性群体判别准确率P1为80.0%-88.6%,P2为79.6%-90.6%,综合判别准确率为83.6%,判别准确率较高,综上结果表明不同水域的群体在形态上产生了一定的差异。

Morphological differences among six groups of different natural waters Procambarus clarkii were studied. Three multi-variation analysis methods with 22 morphological parameters were used. Cluster analysis results showed that increased divergence degrees between Lake Hongze and Sheyang groups,and no obvious difference was found between the Lake Weishan,Yangtze River,Lake Poyang and the Anhui groups. Principal component analysis on the female ones distinguished four principal components with the contribution of 35. 060%,19. 371%,13. 714%,7. 303% and 75. 448% respectively; and for the male ones,at 46. 188%,13. 080%,1. 496%,6. 785% and 77. 549% respectively,the second paraeiopod length and the fifth paraeiopod length have a significant impact of morphological variations of six different waters populations of Procambarus clarkia. Discriminant analysis revealed that the identification accuracy of male was 78. 9%- 92. 1% and 76. 6%- 90. 0%. The total discriminant accuracy was 85. 0%. The identification accuracy of female was 80. 0%- 88. 6% and 79. 6%- 90. 6% the total discriminant accuracy was 83. 6%,for females and males respectively. In conclusion,the groups of different water areas had certain differences on the morphology of the Procambarus clarkia.