Genealogical relationships within and among shallow-water Ciona species (Ascidiacea)
Genealogical relationships within and among shallow-water Ciona species (Ascidiacea)
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DOI：
10.1007/s00227-007-0617-0
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发表时间：
2007-06-01
期刊：
影响因子：
2.4
通讯作者：
Harrison, Richard G.
中科院分区：
文献类型：
--
作者：
Nydam, Marie L.;Harrison, Richard G.
尽管历史和当前对玻璃海鞘及其同源物的兴趣，但对玻璃海鞘属成员之间的进化关系知之甚少。在这里，线粒体细胞色素c氧化酶亚基I（COI）基因的744-bp序列被用来研究三个描述的物种（C。马格德堡角roulei，C. savignyi），从东北太平洋（CA，美国）、西北大西洋（从新罕布什尔州到康涅狄格州，美国）、东北大西洋（瑞典和荷兰）和地中海（Banyuls-sur-Mer，法国）的多个沿海地点取样。样本于2005年6月至10月收集。东北太平洋/地中海（A型）和西北大西洋（B型）C. C. roulei嵌套在类型B C中。好吧赛维氏玻璃海鞘与所有其他单倍型的差异为13- 16%。在Banyuls-sur-Mer站点发现的先前未描述但形态上不同的玻璃海鞘属物种与所有其他单倍型的差异> 10%。虽然这些数据来自单基因研究，但它们表明，如果要研究持续的入侵和潜在的生殖隔离，则需要进一步阐明属内的种间关系和种的分布。
In spite of historical and current interest in Ciona intestinalis and its congeners, little is known about evolutionary relationships among the members of the genus Ciona. Here 744-bp sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene are used to examine phylogenetic relationships among three described species (C. intestinalis, C. roulei, C. savignyi) sampled from multiple coastal sites in the Northeast Pacific (CA, USA), Northwest Atlantic (from New Hampshire to Connecticut, USA), Northeast Atlantic (Sweden and The Netherlands), and Mediterranean (Banyuls-sur-Mer, France). The samples were collected in June-October 2005. The COI sequences of Northeast Pacific/Mediterranean (Type A) and Northwest Atlantic (Type B) C. intestinalis differ by similar to 12% and C. roulei is nested within Type B C. intestinalis. Ciona savignyi differs from all other haplotypes by 13-16%. A previously undescribed but morphologically distinct Ciona sp. found at the Banyuls-sur-Mer site was > 10% divergent from all other haplotypes. Although these data arise from a single gene study, they indicate that further elucidation of species relationships within the genus and of the species' distributions will be needed if continuing invasions and potential reproductive isolation are to be investigated.