Hurtado L A, Lutz R A, Vrijenhoek R C
Monterey Bay Aquarium Research Institute, 7700 Sandholdt Road, Moss Landing, CA 95039, USA.
Mol Ecol. 2004 Sep;13(9):2603-15. doi: 10.1111/j.1365-294X.2004.02287.x.
Population genetic and phylogenetic analyses of mitochondrial COI from five deep-sea hydrothermal vent annelids provided insights into their dispersal modes and barriers to gene flow. These polychaetes inhabit vent fields located along the East Pacific Rise (EPR) and Galapagos Rift (GAR), where hundreds to thousands of kilometers can separate island-like populations. Long-distance dispersal occurs via larval stages, but larval life histories differ among these taxa. Mitochondrial gene flow between populations of Riftia pachyptila, a siboglinid worm with neutrally buoyant lecithothrophic larvae, is diminished across the Easter Microplate region, which lies at the boundary of Indo-Pacific and Antarctic deep-sea provinces. Populations of the siboglinid Tevnia jerichonana are similarly subdivided. Oasisia alvinae is not found on the southern EPR, but northern EPR populations of this siboglinid are subdivided across the Rivera Fracture Zone. Mitochondrial gene flow of Alvinella pompejana, an alvinellid with large negatively buoyant lecithotrophic eggs and arrested embryonic development, is unimpeded across the Easter Microplate region. Gene flow in the polynoid Branchipolynoe symmytilida also is unimpeded across the Easter Microplate region. However, A. pompejana populations are subdivided across the equator, whereas B. symmitilida populations are subdivided between the EPR and GAR axes. The present findings are compared with similar evidence from codistributed species of annelids, molluscs and crustaceans to identify potential dispersal filters in these eastern Pacific ridge systems.
对五种深海热液喷口环节动物的线粒体细胞色素氧化酶亚基I（COI）进行群体遗传学和系统发育分析，有助于深入了解它们的扩散模式和基因流动障碍。这些多毛纲动物栖息在沿东太平洋海隆（EPR）和加拉帕戈斯裂谷（GAR）的喷口区，那里岛屿状的种群之间可能相隔数百至数千公里。长距离扩散通过幼虫阶段进行，但这些分类群的幼虫生活史各不相同。在印度洋-太平洋和南极深海省边界的复活节微板块区域，具有中性浮力的卵黄营养幼虫的西伯格林线虫裂腹鱼（Riftia pachyptila）种群之间的线粒体基因流动减少。西伯格林线虫特氏长腕虫（Tevnia jerichonana）的种群也有类似的细分。在东太平洋海隆南部未发现阿尔文尼娅绿洲虫（Oasisia alvinae），但该西伯格林线虫的东太平洋海隆北部种群在里维拉断裂带被细分。阿尔文尼亚庞贝虫（Alvinella pompejana）是一种具有大的负浮力卵黄营养卵和胚胎发育停滞的阿尔文尼虫，其线粒体基因流动在复活节微板块区域不受阻碍。多鳞虫科的分支多鳞虫（Branchipolynoe symmytilida）的基因流动在复活节微板块区域也不受阻碍。然而，阿尔文尼亚庞贝虫的种群在赤道两侧被细分，而分支多鳞虫的种群在东太平洋海隆和加拉帕戈斯裂谷轴之间被细分。将目前的研究结果与分布在一起的环节动物、软体动物和甲壳类物种的类似证据进行比较，以确定这些东太平洋海岭系统中潜在的扩散过滤器。
