团头鲂种群间的形态差异和生化遗传差异

MORPHOLOGICAL AND BIOCHEMICAL GENETIC VARIATIONS AMONG POPULATIONS OF BLUNT SNOUT BREAM (MEGALOBRAMA AMBLYCEPHALA)

本文报道对长江中、下游3个湖泊、1条江汊里的团头鲂种群的形态差异和生化遗传差异的研究结果。判别函数分析表明,4种群在形态上有差异(P<0.001),因之可在计算机上鉴别鱼的来源,准确率达65.7％。框架形态分析能显著提高对种群的判别分析能力。团头鲂种群的平均多态位点比例为13.3—20.0％,平均杂合度为0.0549—0.0851,Nei遗传距离为0—0.0219。

The results of a study on the variation in morphology and biochemistry of four populations of blunt snout bream from three lakes and one branch along the middle and lower reach of Changjiang River are presented. Discriminant analysis indicated that,overall,there was a significant difference among populations (p<0.001) ,thus the fish could be identified as to their original water body with an accuracy of average 65.7%. The truss network morphometric analysis enhanced the discrimination among populations significantly. The mean proportion of polymorphism was 13.3—20.0%. The average heterozygosity was 0.0549—0.0851. The Nei genetic distance was 0—0. 0219.