Population history associated with hydrothermal vent activity inferred from genetic structure of neoverrucid barnacles around Japan
Population history associated with hydrothermal vent activity inferred from genetic structure of neoverrucid barnacles around Japan
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DOI：
10.3354/meps288233
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发表时间：
2005-01-01
影响因子：
2.5
通讯作者：
Kojima, S
中科院分区：
文献类型：
--
作者：
Watanabe, H;Tsuchida, S;Kojima, S
基于线粒体COI基因661bp片段的序列变异，研究了日本周围两个不同的热液喷口系统--伊豆-小川弧和冲绳海槽的新核藤壶的种群历史。与其他藤壶类相比，所调查的新藤壶类的遗传多样性水平较低。错配分析表明，这些新绿藻经历了与喷口活动有关的灭绝-重新定居事件，这可能是导致日本各地新绿藻遗传多样性水平较低的原因。Izu-Ogarawa Arc和冲绳海槽之间没有共享单倍型，这两个地区的种群之间也没有明显的遗传差异。这些结果表明，根瘤幼虫只在两个区域内扩散，不能在两个区域之间迁徙。冲绳海槽的单倍型形成了一个副系群，排除了伊豆-小川弧的一个单系群。此外，根据失配分析估计，冲绳海槽的人口扩张日期早于伊豆-小川弧。这些结果表明，冲绳海槽的新绿藻种群是栖息在伊豆-小川弧上的新绿藻的来源。
The population histories of neoverrucid barnacles occurring at 2 different hydrothermal vent systems around Japan, namely the Izu-Ogasawara Arc and the Okinawa Trough, were investigated based on the sequence variation in a 661 bp fragment of the mitochondrial COI gene. Compared with other barnacles, the investigated neoverrucids showed low levels of genetic diversity. The mismatch analysis suggested that these neoverrucids have experienced extinction-recolonization events associated with vent activity, and this may have led to the low levels of genetic diversity in neoverrucids around Japan. No haplotypes were shared between the Izu-Ogasawara Arc and the Okinawa Trough and no significant genetic differences were detected among the populations within each of these 2 regions. These results suggest that neoverrucid larvae only disperse within each area and are unable to migrate between the 2 areas. The haplotypes of the Okinawa Trough formed a paraphyletic cluster, with the exclusion of a monophyletic cluster from the Izu-Ogasawara Arc. Furthermore, the population expansion date of the Okinawa Trough, as estimated from the mismatch analysis, was earlier than that of the Izu-Ogasawara Arc. These results suggested that the neoverrucid population in the Okinawa Trough was a source of neoverrucids inhabiting the Izu-Ogasawara Arc.