Genetic variation and geographic population structure of amphidromous ayu Plecoglossus altivelis as examined by mitochondrial DNA sequencing
Genetic variation and geographic population structure of amphidromous ayu Plecoglossus altivelis as examined by mitochondrial DNA sequencing
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DOI：
10.2331/fishsci.65.63
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发表时间：
1999-02-01
影响因子：
1.9
通讯作者：
Nishida, M
中科院分区：
文献类型：
--
作者：
Iguchi, K;Tanimura, Y;Nishida, M
对7个双性香鱼样本（6个来自日本列岛和1个来自朝鲜半岛）的线粒体DNA控制区进行了序列分析，以了解其遗传变异和地理种群结构。韩国样本与日本样本之间的净核苷酸替换程度较大，通过邻接系统图中韩国样本的样本内聚类显示，表明韩国样本代表了一个遗传上不同的群体。在日本群岛内，样本内核苷酸多样性很高，并且掩盖了样本间核苷酸差异，遗传（净核苷酸替代）和地理距离之间没有明显的对应关系。这可能意味着在线粒体 DNA 水平上，样本之间不存在遗传分化，并且它们属于单个大群体。然而，日本群岛样本中样本内核苷酸多样性程度和特定位点核苷酸取代频率存在微小但显着的异质性，表明该群体是亚结构的集合群体。
Sequence analysis on the mitochondrial DNA control region was conducted for seven samples of amphidromous ayu Plecoglossus altivelis, six from the Japanese Archipelago and one from the Korean Peninsula, to understand their genetic variation and geographic population structure. The larger extent of net nucleotide substitution between Korean and Japanese samples, shown by intrasample clustering of the Korean samples in neighbor-joining phylogram, indicated that the Korean sample represented a genetically distinct population. Within the Japanese Archipelago, intrasample nucleotide diversities were high and masked intersample nucleotide divergences, with no obvious correspondence between genetic (net nucleotide substitution) and geographical distances. This may imply that at the mitochondrial DNA level there was no genetic differentiation among samples and they belonged to a single large population. However, minute but significant heterogeneities in the degree of intrasample nucleotide diversity and the frequency of nucleotide substitution at specific sites among Japanese Archipelago samples suggests the population is substructured as a metapopulation.