Congruence between ocean-dispersal modelling and phylogeography explains recent evolutionary history of Cycas species with buoyant seeds
Congruence between ocean-dispersal modelling and phylogeography explains recent evolutionary history of Cycas species with buoyant seeds
复制标题
海洋传播模型和系统发育地理学之间的一致性解释了带有浮力种子的苏铁物种的近期进化史
DOI：
10.1111/nph.17663
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发表时间：
2021
期刊：
影响因子：
9.4
通讯作者：
Gong Xun
中科院分区：
文献类型：
--
作者：
Liu Jian;Lindstrom Anders J.;Chen Yong-Sheng;Nathan Ran;Gong Xun
洋流在驱动许多生物的长距离扩散（LDD），空间分布和地理分布模式方面发挥着重要作用。整合地理学分析和机械洋流模型可以提供新的见解陆地沿岸的物种的进化史，但一直很少应用在这方面，我们专注于一组苏铁，有浮力的种子，并占据沿海栖息地。通过整合来自机械模拟和整体塑性数据的证据，我们研究了海洋环流在塑造这些苏铁物种的海洋地理中的作用。所研究的苏铁物种的塑性体在更新世后的分歧之后表现出极端保守性。系统发育分析表明，该物种可分为3个亚支，分别对应于太平洋、巽他陆架和印度洋。海洋模拟结果表明，种子搁浅的热点与苏铁物种的当代分布相吻合，并且三个亚支的漂流轨迹在很大程度上局限于不同的区域。这些发现表明，洋流系统通过驱动长距离传播，塑造了苏铁的分布和漂浮种子的地理位置。这项研究强调了基因组数据和海洋漂移模型的结合如何有助于解释陆地沿岸的生态系统的地理格局和多样性。
Ocean currents play a significant role in driving the long‐distance dispersal (LDD), spatial distribution and phylogeographic patterns of many organisms. Integrating phylogeographic analyses and mechanistic ocean current modelling can provide novel insights into the evolutionary history of terrestrial littoral species but has been rarely applied in this context.We focused on a group ofCycasthat have buoyant seeds and occupy coastal habitats. By integrating evidence from mechanistic simulations and whole plastomic data, we examined the role of ocean circulation in shaping the phylogeography of theseCycasspecies.Plastomes of the studiedCycasspecies showed extreme conservatism, following a post‐Pleistocene divergence. Phylogenies revealed three subclades, corresponding to the Pacific Ocean, Sunda Shelf and Indian Ocean. The ocean modelling results indicate that hotspots of seed stranding coincide well with the contemporary distribution of theCycasspecies and that drifting trajectories from the three subclades are largely confined to separate regions.These findings suggest that ocean current systems, by driving long‐distance dispersal, have shaped the distribution and phylogeography forCycaswith buoyant seeds. This study highlights how the combination of genomic data and ocean drift modelling can help explain phylogeographic patterns and diversity in terrestrial littoral ecosystems.