黄渤海大头鳕群体形态学研究（英文）

Morphological Variation Among Populations of Gadus Macrocephalus from Bohai Sea and*Yellow Sea

使用主成分分析、聚类分析、单因子方差分析和判别分析对采自黄渤海的100尾大头鳕的11个分节特征和24个量度特征进行形态学比较研究。判别分析结果显示三个群体判别正确率为79．2％～100％，其中青岛群体判别正确率为100%，综合判别正确率为88％；主成分分析结果显示前8个主成分解释了81．72％的形态差异，主成分分析散点图显示三个群体间存在较大差异；单因子方差分析结果显示三个群体间存在较多显著差异的形态指标，差异系数显示但岛和大连群体与青岛群体间存在差异，表明俚岛和大连群体形态较为相近，与青岛群体存在一定差异。

The amount of morphological variation among three Pacific cod populations （100 individuals） was de- termined by multivariate analysis of 11 meristic traits and 24 morphological variables. From three geographically distinct areas the specimens were collected. Several statistical analyses were performed, which included principal component analysis （PCA）, cluster analysis, one-way ANOVA and discriminate analysis. The discrimination accuracy was 79.2 % - 100 % among three populations, in which Qingdao population showed 100 % accuracy. The average discriminate accuracy was 88%. The value of the parameters and the cumulative contribution rate of eight principal components was 81.72 ~/6. Scatter plots of scores on the first and second morphological param- eters showed that there was scarce overlap among three populations. One-way ANOVA showed the significant difference （P=0.05） among three populations based on some variables and coefficients of difference. According to the Mayi＇s 75 % rule, the results indicated that the difference between two groups （Lidao, Dalian） and other group （Qingdao） was slightly different, which indicated that Lidao and Dalian populations were more closely re- lated each other than to Qingdao population.