Evolutionary relationships of deep-sea mussels inferred by mitochondrial DNA sequences
Evolutionary relationships of deep-sea mussels inferred by mitochondrial DNA sequences
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DOI：
10.1007/s00227-006-0268-6
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发表时间：
2006-08-01
期刊：
影响因子：
2.4
通讯作者：
Miyazaki, Jun-ichi
中科院分区：
文献类型：
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作者：
Iwasaki, Hiromi;Kyuno, Akiko;Miyazaki, Jun-ichi
为了阐明深海深蜗贻贝的进化过程，通过对16种深海深蜗贻贝线粒体COI和ND 4基因的核苷酸序列分析，研究了它们的系统发育关系。深海贻贝根据基端分叉分为三个类群。第一个由在日本沃茨发现的四个物种和来自墨西哥湾的一个物种组成，它们含有甲烷营养型内共生细菌。第二类包括9种，分布于西太平洋、东太平洋、印度洋和大西洋。第二组的成员被不规则地分为印度洋-西太平洋、大西洋和东太平洋亚群。印度-西太平洋亚群由三个非常密切相关的物种组成，它们在种内水平上具有相互的遗传距离（av. COI为0.019，ND 4为0.009。除A群种外，其他Bathyodiolus种的COI和ND 4的基因频率分别为0.156和0.265，表明这些种间存在一定的基因流。第三个是两个西太平洋物种。在第二和第三组中的物种主要含有硫自养内共生体，包括一些物种窝藏甲烷氧化菌和硫自养菌。
In order to elucidate the evolutionary process of deep-sea Bathymodiolus mussels, we investigated the phylogenetic relationships of 16 species worldwide by analyzing nucleotide sequences of the mitochondrial COI and ND4 genes. Deep-sea mussels were clustered into three groups by basal trichotomous divergence. The first was composed of four species found in Japanese waters and one species from the Gulf of Mexico, which contain methanotrophic endosymbiotic bacteria. The second included nine species distributed in the West and East Pacific, Indian, and Atlantic Oceans. Members of the second group were trichotomously divided into the Indo-West Pacific, Atlantic, and East Pacific subclusters. The Indo-West Pacific subcluster was composed of three very closely related species with mutual genetic distances at the intraspecific level (av. 0.019 in COI and 0.009 in ND4 relative to av. 0.156 in COI and 0.265 in ND4 among Bathymodiolus species other than Cluster A species), suggesting some gene flow among these species. The third consisted of two West Pacific species. Species in the second and third groups contain mainly thioautotrophic endosymbionts, including some species harboring both methanotrophs and thioautotrophs.