中华小长臂虾(Palaemonetes sinensis)4个群体的形态差异

Morphological differences among four populations of Chinese grass shrimp( Palaemonetes sinensis)

本文采用3种多元分析方法,分析了中华小长臂虾4个群体(鞍山、大连、沈阳和盘锦群体)的形态差异,探讨了它们的形态亲缘关系。聚类分析的结果表明,盘锦群体和鞍山群体的形态差异最小,而与大连和沈阳群体的差异程度逐渐增大。Mantel检验的结果表明,各群体的欧氏距离和地理距离之间没有显著相关性(r=0.576,P=0.901)。经主成分分析得到7个主成分,累计方差贡献率为84.74%,4个群体的形态学分化主要集中在头胸甲部的特征上。经判别分析建立了4个群体的判别函数,判别准确率为66.00%~97.00%,综合判别率为77.83%。本研究可为中华小长臂虾的资源保护和遗传育种提供依据。

Morphological differences in 18 morphological parameters among four populations （Anshan, Dalian, Shenyang and Panjin population） of Chinese grass shrimp （Palaemonetes sinensis） were studied using three multivariation analysis methods, including cluster analysis, principal component analysis and discriminant analysis. Cluster analysis revealed that the populations of Panjin and Anshan were clustered together due to the smallest difference in their morphology, while had a gradually increased difference with Dalian and Shenyang populations. The Mantel matrix tests showed that there was no significant relationship between geographic and Euclidean distances （r=0.576, P=0.901）. Seven principal components with an accumulative variance percentage of 84.74% were extracted by principal component analysis, and indicated the morphological differences mainly resulting from carapace characters. Four discriminant functions were obtained, with the discrimination accuracy being 66.00%-97.00%, and the integrated discrimination accuracy being 77.83%. The results provided a scientific basis for the protection and use of germplasm resources and for artificial selection breeding of Chinese grass shrimps.