Contrasting Genetic Structures Among Populations of Two Hexagrammid Fish Species in the Northwestern Pacific
Contrasting Genetic Structures Among Populations of Two Hexagrammid Fish Species in the Northwestern Pacific
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DOI：
10.1007/s12601-021-00026-y
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发表时间：
2021-07-19
影响因子：
1.3
通讯作者：
Nakayama, Kouji
中科院分区：
文献类型：
--
作者：
Gwak, Woo-Seok;Roy, Animesh;Nakayama, Kouji
使用线粒体 DNA (mtDNA) 控制区序列对来自中国、韩国和日本七个沿海地区的肥绿鱼 (Hexagrammos otakii) 以及来自韩国和日本两个沿海地区的鄂霍茨克鲭鱼 (Pleurogrammus azonus) 的遗传多样性和种群结构进行了研究。来自 231 个个体的序列（序列长度：436 bp）推断出 H. otakii 中的 105 个单倍型，来自 50 个个体的序列（序列长度：404 bp）推断出 P. azonus 中的单个单倍型。 H. otakii 的单倍型和核苷酸多样性范围分别为 0.737 至 0.981 和 0.007 至 0.010，而 P. azonus 的两个多样性指数均为零。 H. otakii 的成对 F-ST 统计显示了辽宁省（中国）、Eoeundol（韩国）和兵库县（日本）的遗传结构种群。错配分布分析表明，所有H. otakii种群都在晚更新世时期经历了扩张，大约距今0.096-0.193 MY。同时，我们发现P. azonus需要比mtDNA控制区更敏感的标记和更多的样本来揭示遗传多样性和种群结构。因此，本研究表明，即使属于同一科、具有相同生态特征的鱼类也可能具有不同的遗传多样性。
The genetic diversity and population structure of the fat greenling (Hexagrammos otakii) from the seven coastal locations in China, Korea, and Japan and the Okhotsk atka mackerel (Pleurogrammus azonus) from two coastal locations in Korea and Japan were investigated using the mitochondrial DNA (mtDNA) control region sequences. Sequences from 231 individuals (sequence length: 436 bp) inferred 105 haplotypes in the H. otakii, and sequences from 50 individuals (sequence length: 404 bp) inferred a single haplotype in the P. azonus. The haplotype and nucleotide diversities ranged from 0.737 to 0.981 and 0.007 to 0.010, respectively, for the H. otakii, whereas both diversity indices were zero for the P. azonus. Pairwise F-ST statistics for the H. otakii showed genetically structured populations for Liaoning (China), Eoeundol (Korea), and Hyogo (Japan). Mismatch distribution analysis showed that all of the H. otakii populations experienced an expansion in the Late Pleistocene period, approximately 0.096-0.193 MY before the present. Meanwhile, it was found that P. azonus needs more sensitive markers than mtDNA control region and more samples to reveal genetic diversity and population structure. As a result, the present study revealed that even fish belonging to the same family and with the same ecological characteristics may have different genetic diversity.