To assess genetic variation in pink salmon (Oncorhynchus gorbuscha), the polymorphism of nucleotide sequences of the ND2 and Cytb (mtDNA) genes has been analyzed in 404 individuals of even- and odd-year broodlines from 10 temporal samples collected in different years from one river. The data that earlier indicated a high level of genetic differences between samples of the broodlines spawning in even- and odd-numbered years have been confirmed. Genetic differences between samples of early- and late-run fish was detected in a number of cases. A high probability of purifying selection of the studied genes in both broodlines of pink salmon was found using neutrality tests and models based on likelihood methods and Bayesian approach. A median network of haplotypes based on combined mtDNA sequences for even- and odd-year broodlines have revealed the star-like genealogies and the incomplete “sorting” of haplotypes between them. The analysis of distribution of pairwise nucleotide substitutions, neutrality tests, and Bayesian skyline data support the model of expansion for the population of both pink salmon broodlines that occurred at almost the same time. A study of the history of haplotype divergence inferred from the Bayesian chronogram show the similarity of demographic histories in the populations of both broodlines as a reflection of paleoclimate changes in the region.

中文翻译：

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来自萨哈林岛的偶数年和奇数年繁殖的粉红鲑鱼 Oncorhynchus gorbuscha（Walbaum，1792 年）种群中线粒体 DNA 遗传变异和人口统计历史的比较分析

为了评估粉红鲑鱼 (Oncorhynchus gorbuscha) 的遗传变异，我们分析了 404 名偶数年和奇数年育种个体的 ND2 和 Cytb (mtDNA) 基因核苷酸序列的多态性，这些个体来自于不同年份收集的 10 个时间样本。河。早先表明偶数年和奇数年产卵的亲本样本之间存在高度遗传差异的数据已得到证实。在许多情况下检测到早跑鱼和晚跑鱼样本之间的遗传差异。使用基于似然方法和贝叶斯方法的中性检验和模型，发现在粉红鲑鱼的两个亲本中纯化选择的研究基因的可能性很高。基于偶数年和奇数年亲本组合 mtDNA 序列的单倍型中值网络揭示了星状家谱和它们之间不完整的单倍型“排序”。对成对核苷酸取代分布的分析、中性检验和贝叶斯天际线数据支持几乎同时发生的两种粉红鲑鱼亲本种群的扩张模型。对从贝叶斯年表推断出的单倍型差异历史的研究表明，两种亲本种群的人口统计历史相似，反映了该地区的古气候变化。和贝叶斯天际线数据支持几乎同时发生的两种粉红鲑鱼种群的扩张模型。对从贝叶斯年表推断出的单倍型差异历史的研究表明，两种亲本种群的人口统计历史相似，反映了该地区的古气候变化。和贝叶斯天际线数据支持几乎同时发生的两种粉红鲑鱼种群的扩张模型。对从贝叶斯年表推断出的单倍型差异历史的研究表明，两种亲本种群的人口统计历史相似，反映了该地区的古气候变化。