西北太平洋深海热液喷口和冷泉蜗牛（软体动物：深渊金眼螺超科）的种群历史
Population history of deep-sea vent and seep snails (Mollusca: Abyssochrysoidea) in the northwestern Pacific.
作者信息
Ogura Tomomi, Watanabe Hiromi Kayama, Chen Chong, Sasaki Takenori, Kojima Shigeaki, Ishibashi Jun-Ichiro, Fujikura Katsunori
机构信息
Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, Tokyo, Japan.
Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa, Japan.
出版信息
PeerJ. 2018 Sep 26;6:e5673. doi: 10.7717/peerj.5673. eCollection 2018.
BACKGROUND
Gastropods of the genus are abundant and widely distributed in deep-sea chemosynthetic environments with seven extant species described in the northwestern Pacific.
METHODS
We investigated the population history and connectivity of five species in the northwestern Pacific through population genetic analyses using partial sequences of the cytochrome oxidase subunit I gene.
RESULTS
We found that , the most abundant and genetically diverse species, is genetically segregated by depth. Among the five species, the three comparatively shallower species () had a more constant demographic history compared to the deeper species (, ).
DISCUSSION
Environmental differences, especially depth, appears to have a role in the segregation of snails. The population of in the Irabu Knoll appears to have expanded after population. The remaining three species, , , and , are only known from a single site each, all of which were shallower than 1,000 m. These data indicate that gastropods are vertically segregated, and that their population characteristics likely depend on hydrothermal activities.
背景
属腹足纲动物在深海化学合成环境中数量众多且分布广泛，在西北太平洋已描述有七个现存物种。
方法
我们通过使用细胞色素氧化酶亚基I基因的部分序列进行种群遗传分析，研究了西北太平洋五种 物种的种群历史和连通性。
结果
我们发现，数量最多且遗传多样性最高的物种 在遗传上按深度隔离。在这五个物种中，与较深的物种（ 、 ）相比，三个相对较浅的物种（ ）具有更稳定的种群历史。
讨论
环境差异，尤其是深度，似乎在 蜗牛的隔离中起作用。伊拉布海山的 种群似乎在 种群之后有所扩张。其余三个物种， 、 和 ，每个仅在一个地点被发现，所有这些地点都比1000米浅。这些数据表明 腹足纲动物在垂直方向上是隔离的，并且它们的种群特征可能取决于热液活动。
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