Causations of phylogeographic barrier of some rocky shore species along the Chinese coastline

Background: Substrate, ocean current and freshwater discharge are recognized as important factors that control the larval dispersal and recruitment of intertidal species. Life history traits of individual species will determine the differential responses to these physical factors, and hence resulting in contrasting phylogeography across the same biogeographic barrier. To determine how these factors affect genetic structure of rocky shore species along the China coast, a comparative phylogeographic study of four intertidal and subtidal species was conducted using mitochondrial and nuclear DNA by combining new sequences from Siphonaria japonica with previously published sequences from three species (Cellana toreuma, Sargassum horneri and Atrina pectinata). Results: Analysis of molecular variance and pairwise ΦST revealed significant genetic differences between the Yellow Sea (YS) and the other two marginal seas (East China Sea, ECS and South China Sea, SCS) for rocky-shore species (S. jap...背景（Background）：底质（substrate）、海流与淡水输入被公认为调控潮间带物种（intertidal species）幼体扩散与补充的关键因子。不同物种的生活史特征（life history traits）会决定其对这些物理因子的差异化响应，进而在同一生物地理屏障（biogeographic barrier）两侧形成截然不同的系统地理学（phylogeography）格局。为探明上述因子如何影响中国沿海岩岸物种的遗传结构（genetic structure），本研究结合日本筒笠螺（Siphonaria japonica）的新测序序列与已发表的3个物种（花笠螺Cellana toreuma、钝顶马尾藻Sargassum horneri、栉江珧Atrina pectinata）的序列数据，采用线粒体DNA（mitochondrial DNA）与核DNA（nuclear DNA）标记，对4种潮间带及潮下带物种（subtidal species）开展了比较系统地理学研究。结果（Results）：分子方差分析（Analysis of molecular variance, AMOVA）与两两ΦST（pairwise ΦST）分析显示，岩岸物种的黄海（Yellow Sea, YS）种群与另外两个边缘海——东海（East China Sea, ECS）及南海（South China Sea, SCS）种群间存在显著遗传分化（S. jap...