Occurrence and recent long-distance dispersal of deep-sea hydrothermal vent shrimps
Occurrence and recent long-distance dispersal of deep-sea hydrothermal vent shrimps
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DOI：
10.1098/rsbl.2005.0420
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发表时间：
2006-06
期刊：
影响因子：
3.3
通讯作者：
G. Tokuda;Akinori Yamada;Kazuma Nakano;Nao O. Arita;H. Yamasaki
中科院分区：
文献类型：
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作者：
G. Tokuda;Akinori Yamada;Kazuma Nakano;Nao O. Arita;H. Yamasaki
深海热液喷口和甲烷渗漏是含有高浓度硫化氢的极端环境。然而，在这样的环境中，已经发现了丰富的独特的无脊椎动物，包括虾科的虾。据信，这种虾类在中新世（不到2000万年）就已经辐射了;然而，它们在世界各地的热液喷口和冷泉中扩散的时期和机制还没有弄清楚。本研究首次对采自冲绳海槽热液喷口的深海盲虾Alvinocaris longirostris的18 S rRNA基因进行了研究。系统发育分析表明，该科虾类位于Caridea下目的中间谱系，与生活在浅海和淡水环境中的古虾类具有单系性。此外，线粒体细胞色素氧化酶I（COI）基因序列进行了分析，以确定与已知的bellidae虾的系统发育关系。A.冲绳海槽的长吻虾具有两种COI基因单倍型，其中一种与相模湾冷泉的Alvinocaris sp.相同。这些结果表明，A.长吻龙可能出现在过去的10万年里。
Deep-sea hydrothermal vents and methane seeps are extreme environments that have a high concentration of hydrogen sulphide. However, abundant unique invertebrates including shrimps of the family Bresiliidae have been found in such environments. The bresiliid shrimps are believed to have radiated in the Miocene (less than 20 Myr); however, the period when and the mechanisms by which they dispersed across the hydrothermal vents and cold seeps in oceans worldwide have not been clarified. In the present study, we collected the deep-sea blind shrimp Alvinocaris longirostris from the hydrothermal vent site in the Okinawa Trough and carried out the first investigation of the 18S rRNA gene of a bresiliid shrimp. The phylogenetic analysis revealed that the bresiliid shrimp is situated at an intermediate lineage within the infraorder Caridea and shows monophyly with palaemonid shrimps, which live in shallow sea and freshwater. Furthermore, the mitochondrial cytochrome oxidase I (COI) gene sequences were analysed to determine the phylogenetic relationship with known bresiliid shrimps. A. longirostris of the Okinawa Trough had two haplotypes of the COI gene, one of which was identical to the Alvinocaris sp. of the cold seeps in Sagami Bay. These results indicate that a long-distance dispersal of A. longirostris occurred possibly within the last 100 000 years.