Phylogeographic heterogeneity of the brown macroalga Sargassum horneri (Fucaceae) in the northwestern Pacific in relation to late Pleistocene glaciation and tectonic configurations
Phylogeographic heterogeneity of the brown macroalga Sargassum horneri (Fucaceae) in the northwestern Pacific in relation to late Pleistocene glaciation and tectonic configurations
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西北太平洋棕色大型藻类马尾藻科（Fucaceae）的系统发育异质性与晚更新世冰川作用和构造构造的关系
DOI：
10.1111/j.1365-294x.2011.05220.x
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发表时间：
2011-09-01
影响因子：
4.9
通讯作者：
Duan, De-Lin
中科院分区：
文献类型：
--
作者：
Hu, Zi-Min;Uwai, Shinya;Duan, De-Lin
更新世冰川振荡和相关的构造过程被认为影响了亚洲西北太平洋(ANP)生物的历史丰度和分布。越来越多的证据表明，影响海洋类群时空种群动态和分布格局的因素因生物地理纬度、远洋行为和海洋状况而异。为了弄清哪些历史和当代因素影响遗传连通性，基于线粒体(Cox3)和叶绿体(RbcL)数据集，分析了ANP中滨海大型藻类马尾藻的系统地理分布。发现了五个不同的分支。生物地理结构的显著特征(ΦCT = 0.487，P <； 0.0001)源于分支分布的显著分异，因为分支I局限于中国边缘海(黄渤海、东中国海和南中国海)，而分支II-V不连续地散布在日本主要岛屿周围。此外，还确定了日本南太平洋海岸线上的两个次级接触区域。这两个盆地之间的这种显著差异可能反映了西北太平洋历史上的冰川隔离，这与第四纪晚期低海平面期间的分支分歧和人口扩张的估计是一致的。分子方差分析和种群对统计量FST也揭示了中国边缘海和日本盆地之间存在显著的成因结构差异。这种特殊的海洋地理结构最初是由晚更新世冰期的历史地理隔离和物理生物地理障碍形成的，但海洋状况(洋面流)和海洋漂移等迁移行为可能会使其复杂化。
Pleistocene glacial oscillations and associated tectonic processes are believed to have influenced the historical abundances and distribution of organisms in the Asia Northwest Pacific (ANP). Accumulating evidence indicates that factors shaping tempospatial population dynamics and distribution patterns of marine taxa vary with biogeographical latitude, pelagic behaviour and oceanographic regimes. To detect what kinds of historical and contemporary factors affected genetic connectivity, phylogeographic profiles of littoral macroalga Sargassum horneri in the ANP were analysed based on mitochondrial (Cox3) and chloroplast (rbcL) data sets. Five distinct clades were recovered. A strong signature of biogeographical structure was revealed (ΦCT = 0.487, P < 0.0001) derived from remarkable differentiation in clade distribution, as clade I is restricted to Chinese marginal seas (Yellow–Bohai Sea, East China Sea and South China Sea), whereas clades II–V are discontinuously scattered around the main Islands of Japan. Furthermore, two secondary contact regions were identified along the south Japan‐Pacific coastline. This significant differentiation between the two basins may reflect historical glacial isolation in the northwestern Pacific, which is congruent with the estimates of clade divergence and demographic expansion during the late Quaternary low sea levels. Analysis of molecular variance and the population‐pair statistic FST also revealed significant genetic structural differences between Chinese marginal seas and the Japanese basin. This exceptional phylogeographic architecture in S. horneri, initially shaped by historical geographic isolation during the late Pleistocene ice age and physical biogeographical barriers, can be complicated by oceanographic regimes (ocean surface currents) and relocating behaviour such as oceanic drifting.