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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Contrasting plant diversification histories within the Andean biodiversity hotspot
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Contrasting plant diversification histories within the Andean biodiversity hotspot

机译：安第斯生物多样性热点中不同的植物多样化历史

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摘要

The Andes are the most species-rich global biodiversity hotspot. Most research and conservation attention in the Andes has focused on biomes such as rain forest, cloud forest, and paramo, where much plant species diversity is the hypothesized result of rapid speciation associated with the recent Andean orogeny. In contrast to these mesic biomes, we present evidence for a different, older diversification history in seasonally dry tropical forests (SDTF) occupying rain-shadowed inter-Andean valleys. High DNA sequence divergence in Cyathostegia mathewsii, a shrub endemic to inter-Andean SDTF, indicates isolation for at least 5 million years of populations separated by only ca. 600 km of high cordillera in Peru. In conjunction with fossil evidence indicating the presence of SDTF in the Andes in the late Miocene, our data suggest that the disjunct small valley pockets of inter-Andean SDTF have persisted over millions of years. These forests are rich in endemic species but massively impacted, and merit better representation in future plans for science and conservation in Andean countries.
机译：安第斯山脉是物种最多的全球生物多样性热点。安第斯山脉的大多数研究和保护工作都集中在雨林，云雾森林和帕拉莫等生物群落上，在这些群落中，许多植物物种多样性是与最近的安第斯造山运动有关的快速物种形成的假设结果。与这些内生型生物群落相反，我们提供了证据证明在安第斯山脉间暗雨笼罩的季节性干燥热带森林（SDTF）中存在不同的，较古老的多样化历史。 Cyathostegia mathewsii（一种安第斯山脉间SDTF特有的灌木）中的高DNA序列差异表明，至少有500万年仅被约旦河分隔的种群被隔离。秘鲁600公里的高山脉。结合表明中新世晚期安第斯山脉中存在SDTF的化石证据，我们的数据表明，安第斯山脉间SDTF相互分离的小山谷地带已经持续了数百万年。这些森林特有物种丰富，但受到的影响很大，在安第斯国家的科学和保护未来计划中应有更好的代表性。

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