Approximate Bayesian Computation Reveals the Crucial Role of Oceanic Islands for the Assembly of Continental Biodiversity.
Approximate Bayesian Computation Reveals the Crucial Role of Oceanic Islands for the Assembly of Continental Biodiversity.
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DOI：
10.1093/sysbio/syv013
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发表时间：
2015-07
影响因子：
6.5
通讯作者：
Jairo Patiño;Jairo Patiño;Jairo Patiño;M. Carine;P. Mardulyn;N. Devos;Rubén G. Mateo;Rubén G. Mateo;J. González-Mancebo;A. J. Shaw;A. Vanderpoorten;A. Vanderpoorten
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文献类型：
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作者：
Jairo Patiño;Jairo Patiño;Jairo Patiño;M. Carine;P. Mardulyn;N. Devos;Rubén G. Mateo;Rubén G. Mateo;J. González-Mancebo;A. J. Shaw;A. Vanderpoorten;A. Vanderpoorten
人们认为遗传多样性水平低，种间竞争和防御能力差，以及岛屿血统的扩散能力丧失，促使人们认为海洋岛屿是进化的死胡同。着眼于分布在亚速尔群岛、马德拉群岛、加那利群岛、西欧和西北部非洲群岛的大西洋苔藓植物区系，我们使用了一种综合的方法，结合物种分布建模和基于近似贝叶斯计算的种群遗传分析，以确定这一观点是否适用于具有固有的高扩散能力的生物。研究发现，岛屿种群的遗传多样性高于大陆种群，这有助于提供越来越多的证据，表明与理论预期相反，岛屿种群不一定在基因上恶化。岛屿和大陆种群之间的遗传变异模式一致地符合岛屿祖先大陆种群从头开始的情景下模拟的模式，比如果岛屿将代表大陆生物多样性的汇点或避难所的情况下的预期更好。我们认为，东北大西洋群岛作为跨洋移民的垫脚石发挥了关键作用。我们的结果挑战了认为海洋岛屿是殖民道路的终点的传统观念，并说明了海洋岛屿作为新的生物多样性储存库对大陆植物群的组装所起的重要作用。
The perceived low levels of genetic diversity, poor interspecific competitive and defensive ability, and loss of dispersal capacities of insular lineages have driven the view that oceanic islands are evolutionary dead ends. Focusing on the Atlantic bryophyte flora distributed across the archipelagos of the Azores, Madeira, the Canary Islands, Western Europe, and northwestern Africa, we used an integrative approach with species distribution modeling and population genetic analyses based on approximate Bayesian computation to determine whether this view applies to organisms with inherent high dispersal capacities. Genetic diversity was found to be higher in island than in continental populations, contributing to mounting evidence that, contrary to theoretical expectations, island populations are not necessarily genetically depauperate. Patterns of genetic variation among island and continental populations consistently fitted those simulated under a scenario of de novo foundation of continental populations from insular ancestors better than those expected if islands would represent a sink or a refugium of continental biodiversity. We, suggest that the northeastern Atlantic archipelagos have played a key role as a stepping stone for transoceanic migrants. Our results challenge the traditional notion that oceanic islands are the end of the colonization road and illustrate the significant role of oceanic islands as reservoirs of novel biodiversity for the assembly of continental floras.