我国沿海鲻鱼(Mugil cephalus)不同地理群体形态差异研究

MORPHOLOGICAL VARIATION OF GREY MULLET MUGIL CEPHALUS IN DIFFERENT GEOGRAPHICAL POPULATIONS ALONG CHINA COAST

运用多变量形态度量学分析方法,对我国沿海的四个鲻鱼群体110个个体的形态变异进行了分析。聚类分析和主成分分析结果表明,位于我国南部沿海的广东湛江群体(ZJ)与福建厦门群体(XM)形态最为接近,位于北部沿海的河北塘沽群体(HB)与山东青岛群体(QD)的形态最为接近;而南、北部群体间的趋异程度较大,有一定程度的形态分化。主成分分析前3个主成分对不同群体间总变异方差的贡献率分别为:50.00%、12.16%、11.10%,累积贡献率为73.25%。主成分分析结果表明,四个鲻鱼群体在形态上的差别很大程度上是由体型的高低、长短引起的,且主要集中在胸部和尾部。判别分析中采用9个不同的变量,分别构建了四个鲻鱼群体的判别公式,判别正确率达到99.1%。

Morphological variations among four geographical populations of Mugil cephalus were analyzed using three multivariation analysis methods using 23 morphometric proportional parameters. The results of clusters analysis and principal component analysis show similar morphological characters within populations, despite that the morphology between northern and southern populations is quite different. The contribution of height and length of the chest and tail to the total variances is the greatest shown by principal component analysis; and the total discriminant accuracy is 99.1% indicated by discriminant analysis. All the results show the four populations can be identified using three multivariation analysis methods as among-population differences are obvious.