不同地区克氏原螯虾群体的形态多样性分析

运用3种多元统计方法,对江苏、安徽、山东和湖北4个不同地区克氏原螯虾(Procambarus clarkii)野生群体的13个形态比例参数进行比较研究。聚类分析结果显示,山东和江苏2个克氏原螯虾群体之间的形态最为接近,而与湖北和安徽群体间趋异程度逐渐增大。主成分分析中,雌性群体贡献率分别是主成分1为46.104%、主成分2为25.375%、主成分3为10.830%,累积贡献率为82.309%;而雄性群体贡献率分别是主成分1为50.611%、主成分2为26.365%、主成分3为8.623%,累积贡献率为85.599%。判别分析中,雌体准确率P1为70.6%～100.0%,P2为52.9%～100.0%,综合判别率为87.6%;雄体准确率P1为66.7%～100.0%,P2为66.7%～100.0%,综合判别率为92.1%。研究结果表明,不同地区克氏原螯虾群体间已经产生了一定程度的形态差异,且主要表现在头胸甲部和腹部的性状上,但这些差异尚未达到亚种水平,需多项参数综合分析才能进行不同群体间的辨别。

Morphological diversity analysis of different geographic populations of Procambarus clarkii

Morphological data of four different wild geographic populations of Procambarus clarkii collected from Jiangsu, Anhui, Shandong and Hubei provinces in China were analyzed. Thirteen proportion of morphometric trait were measured from crayfish and the degree of morphological variation among populations was calculated using three multivariate analysis. The results of cluster analysis showed that the morphometric characters of the Jiangsu population were more similar to those of the populations of Shandong than to those of the populations of Hubei and Anhui. In the principal component analysis of the female populations, three principal components were constructed, the contributory ratio of the first principal component was 46.104%, the second and the third was 25.375% and 10.830% respectively, the cumulative contributory ratio was 82.309%. Accordingly, for the male populations, three principal components were also constructed, their contributory ratios were 50.611%, 26.365% and 8.623% respectively, the cumulative contributory ratio was 85.599%. Discriminant analysis indicated that the identification accuracy of female was 70.6%-100.0% (P1) and 52.9%-100.0% (P2). The total discriminant accuracy was 87.6%. The identification accuracy of male was 66.7%-100.0% (P1) and 66.7%-100.0% (P2), the total discriminant accuracy was 92.05%. All results supported that there are a little differences among P. clarkii populations on morphological characters and the morphological variations in different populations were mostly exhibited by differences of carapace and abdominal, but have not reached the level of subspecies.