不同地理种群泥蚶的形态差异与判别分析

泥蚶(Tegillarca granosa Linnaeus)为印度椢魈洋海域的广温广盐性贝类,在我国主要分布于山东以南沿海,是我国沿海滩涂的主要经济养殖贝类.有关泥蚶人工育苗、繁殖与生长和生理生化等方面的研究已有较多报道1-9],但种内形态特征的地理变异未见报道.本文利用多变量形态度量学方法对我国山东、浙江、广西和韩国4个地理种群泥蚶的形态变异进行了比较研究,探讨了泥蚶种内的形态变异特点与地理分化规律、并建立判别函数,为泥蚶地理种群的识别、种质保护和良种选育提供理论依据.

Morphological variations and discriminant analysis of different geographical populations of Tegillarca granosa

Based on nine morphological characters of populations of Tegillarca granosa from Guangxi, Zhejiang, Shandong,of China and Lishui, Korea, multivariate morphometrics was used to investigate their morphological variations among the four different geographical populations. ANOVA indicated that four populations showed significant morphological variations respectively (P <0.01). In the result of principal component analysis, two principal components (PC) were constructed by factor loading, in which the first principal component (PC1) was affected by shell width, shell height and shell moisture weight, and the PC2 was affected by hinge tooth, and the contributory ratios of two PC were 41.02% and 20.41%, respectively. The results of principal component analysis and cluster analysis revealed that the morphological chTegillraca granosa from Zhejiang population and Shandong population were similar. The discriminant functions of four populations were established, and the discriminant accuracy was 90.80%, 80.89%, 71.76%, and 97.46% respectively, so the average discriminant accuracy was 86.23%.