Abstract

Multiple Pleistocene glaciations significantly affected the gene pool of many species inhabiting the Northern part of the Pacific Rim, an area with a rich glacial history. This paper is devoted to the study of intraspecific polymorphism of the coho salmon and the routes of its settlement throughout the Asian part of its range. Such problems are traditionally solved by comparing parts of the mitochondrial genome. Here, two fragments of mtDNA, the control region (D-loop) and the cytochrome b gene (cytb), were investigated. It was shown that the settlement of the Asian Pacific coast by the coho salmon was preceded by a chain of successive migration events from the refugium located on the North American continent to the South of the ice sheet covering the area of modern Canada and southern Alaska. The low level of genetic polymorphism in Asian coho populations seems to be a result of a pronounced founder effect, rather than being characteristic of the species as a whole.

中文翻译：

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亚洲银大麻哈鱼的系谱和线粒体多态性

摘要

多次更新世冰川明显影响了居住在环太平洋北部的许多物种的基因库，该地区具有丰富的冰川历史。本文致力于研究银大麻哈鱼的种内多态性及其在亚洲范围内的定居途径。传统上，这类问题是通过比较线粒体基因组的部分来解决的。在这里，mtDNA的两个片段是控制区（D环）和细胞色素b基因（cytb），进行了调查。研究表明，银大麻哈鱼在亚太沿岸定居之前，发生了一系列连续的迁移事件，从位于北美大陆的避难所到覆盖现代加拿大和阿拉斯加南部的冰原以南。亚洲银大麻酚种群中低水平的遗传多态性似乎是明显的创始人效应的结果，而不是整个物种的特征。