Historical Biogeography of Caribbean Plants Revises Regional Paleogeography
Historical Biogeography of Caribbean Plants Revises Regional Paleogeography
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加勒比植物的历史生物地理学修订了区域古地理
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
C. Bacon
中科院分区：
文献类型：
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作者：
J. Roncal;María Esther Nieto‐Blázquez;A. Cardona;C. Bacon
加勒比群岛是新热带地区最大、物种最丰富的岛屿系统，但人们对这个生物多样性热点的起源知之甚少。四个主要的假设已被提出来解释加勒比多样性：vicariance，GAARlandia landspan，长距离扩散，并在原地物种形成。在这里，我们使用的系统发育数据和历史地理推断的加勒比特有植物来测试这四个假设。再加上加勒比古地理的修订，我们编译的殖民时代，在原地物种形成，和加勒比地方性血统的祖先地区。我们的模型中的物种丰富度的差异，特有的血统作为其在加勒比地区的殖民时间的函数，从而估计的时间形成的效果。我们的研究结果表明，在过去的6000万年里，植物从美洲大陆，特别是从中美洲和南美洲，反复殖民西印度群岛。植物定植时间不集群在GAARlandia的时间框架和大多数定植事件发生后，其假定的沉降。我们没有发现在每个地方性分支的物种数量和估计的时间之间的关系，当每个殖民加勒比（没有时间的物种形成的影响）。已公布的小安的列斯群岛和阿维斯海岭的地质限制未能支持安的列斯群岛和南美洲之间的新兴土地。
The Caribbean archipelago is the largest and most species rich insular system in the Neotropics, yet the origins of this biodiversity hotspot are poorly understood. Four main hypotheses have been proposed to explain Caribbean diversity: vicariance, GAARlandia landspan, long-distance dispersal, and in situ speciation. Here, we use phylogenetic data and historical biogeographical inferences of Caribbean endemic plants to test amongst these four hypotheses. Together with a revision of Caribbean paleogeography, we compile the colonization times, in situ speciation, and ancestral areas of Caribbean endemic lineages. We model species richness differences among endemic lineages as a function of their colonization time in the Caribbean, resulting in an estimation of the time-for-speciation effect. Our results show that plants repeatedly colonized the West Indies over the last 60 million years from continental America, especially from central and south America. Plant colonization times do not cluster during the GAARlandia timeframe and most colonization events occurred after its putative subsidence. We did not find a relationship between the number of species in each endemic clade and the estimated time when each colonized the Caribbean (no time-for-speciation effect). Published geological constraints from the Lesser Antilles and Aves Ridge fail to support the emergent land between the Antilles and south America.