Incongruent patterns of genetic connectivity among four ophiuroid species with differing coral host specificity on North Atlantic seamounts
Incongruent patterns of genetic connectivity among four ophiuroid species with differing coral host specificity on North Atlantic seamounts
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DOI：
10.1111/j.1439-0485.2010.00395.x
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发表时间：
2010-09-01
影响因子：
1.1
通讯作者：
Shank, Timothy M.
中科院分区：
文献类型：
--
作者：
Cho, Walter;Shank, Timothy M.
海隆被认为在海洋动物群的进化和多样性方面发挥着决定性作用，是扩散的“踏脚石”，是遗传隔离和物种形成的区域中心，也是深海种群的避难所。本研究的重点是分散和遗传连接的模式的四个海山蛇（Asteroschema clavigera，Ophiocreas俄狄浦斯，Ophioplinthaca abyssalis，和Ophioplinthaca chelys）显示不同程度的关联（epifaunal）的特异性冷水珊瑚主机居住的新英格兰和角上升海山链，穆尔海山在西北大西洋。mt16S和mtCOI的分析揭示了所有四个物种最近人口扩张和高基因流的证据。然而，种特异性遗传分化是显着的海山区域和深度的基础上。各区域海山组间的A. clavigera，在海山区和海山内为O. chelys，在250 m深度层段A. clavigera，在100 m深度层段中，O.俄狄浦斯，并有迹象表明，隔离的距离为A。clavigera和O.俄狄浦斯此外，A. clavigera和O.俄狄浦斯，广播产卵与高保真特定的珊瑚主机，主要向西迁移的历史，而ophioplinthacids，主机特异性较低，主要向东迁移。在物种和海山之间没有明显的一致的历史迁移模式，但这些模式可以与特定物种的宿主特异性，特定的深度层，和扩散策略。保护海山生态系统的养护工作应促进采用多物种办法处理遗传关联性，并考虑生物多样性对这些脆弱海洋生态系统中宿主动物的“依赖性”所产生的影响。
Seamounts are considered to play a defining role in the evolution and diversity of marine fauna, acting as 'stepping-stones' for dispersal, regional centers of genetic isolation and speciation, and refugia for deep-sea populations. This study focused on the patterns of dispersal and genetic connectivity of four seamount ophiuroid species (Asteroschema clavigera, Ophiocreas oedipus, Ophioplinthaca abyssalis, and Ophioplinthaca chelys) displaying differing levels of associative (epifaunal) specificity to cold-water coral hosts inhabiting the New England and Corner Rise Seamount chains, and Muir Seamount in the Northwestern Atlantic. Analyses of mt16S and mtCOI revealed evidence for recent population expansion and high gene flow for all four species. However, species-specific genetic differentiation was significant based on seamount region and depth. Significant differences were found among regional seamount groups for A. clavigera, within seamount regions and seamounts for O. chelys, among 250-m depth intervals for A. clavigera, among 100-m depth intervals for O. oedipus, and there were indications of isolation by distance for A. clavigera and O. oedipus. In addition, A. clavigera and O. oedipus, broadcast spawners with high fidelity to specific coral hosts, displayed predominantly westward historical migration, whereas the ophioplinthacids, with lower host-specificity, displayed predominantly eastward migration. No congruent patterns of historical migration were evident among species and seamounts, yet these patterns can be correlated with species-specific host specificity, specific depth strata, and dispersal strategies. Conservation efforts to protect seamount ecosystems should promote multi-species approaches to genetic connectivity, and consider the impact of the 'dependence' of biodiversity on host fauna in these vulnerable marine ecosystems.