Beacham T D, Withler R E
Heredity (Edinb). 1985 Jun;54 ( Pt 3):313-22. doi: 10.1038/hdy.1985.42.
We compared variability in two meristic and six morphometric characters with heterozygosity within and among 27 populations of chum salmon (Oncorhynchus keta) in southern British Columbia. Among individuals, there was no relationship between levels of heterozygosity at 10 electrophoretic loci and degree of meristic or morphometric variation. Decreased morphological variance was not associated with increased heterozygosity. Morphological variance and heterozygosity did not change with age for chum salmon maturing at three to five years of age. Among populations of chum salmon, increased levels of average heterozygosity were not associated with decreased variance of morphometric or meristic characters. Our results do not support the hypothesis that more heterozygous individuals show less phenotypic variability than more homozygous ones due to a canalization of morphology during development. Genetic distances between pairs of chum salmon populations were significantly correlated with pairwise Mahalanobis distances derived from meristic, but not from morphometric characters. Chum salmon are morphometrically adapted to the natal stream environment, whereas biochemical and meristic characters in these populations may be less affected by local selective forces.
我们比较了不列颠哥伦比亚省南部27个秋鲑（Oncorhynchus keta）种群内部和种群之间，两个分节特征和六个形态特征的变异性与杂合性。在个体中，10个电泳位点的杂合性水平与分节或形态变异程度之间没有关系。形态方差的降低与杂合性的增加无关。对于三到五岁成熟的秋鲑，形态方差和杂合性不会随年龄变化。在秋鲑种群中，平均杂合性水平的增加与分节或形态特征方差的降低无关。我们的结果不支持以下假设：由于发育过程中形态的定向化，杂合性更高的个体比纯合性更高的个体表现出更少的表型变异性。成对秋鲑种群之间的遗传距离与源自分节特征而非形态特征的成对马氏距离显著相关。秋鲑在形态上适应出生溪流环境，而这些种群中的生化和分节特征可能受局部选择力的影响较小。
