The accretion of the Indian subcontinent to Eurasia triggered a massive faunal and floral exchange, with Gondwanan taxa entering into Asia and vice versa. The traditional view on the Indian-Asian collision assumes contact of the continental plates during the Early Eocene. Many biogeographic studies rely on this assumption. However, the exact mode and timing of this geological event is still under debate. Here we address, based on an extensive phylogenetic analysis of rhacophorid tree frogs, if there was already a Paleogene biogeographic link between Southeast Asia and India; in which direction faunal exchange occurred between India and Eurasia within the Rhacophoridae; and if the timing of the faunal exchange correlates with one of the recently suggested geological models. Rhacophorid tree frogs showed an early dispersal from India to Asia between 46 and 57 Ma, as reconstructed from the fossil record. During the Middle Eocene, however, faunal exchange ceased, followed by increase of rhacophorid dispersal events between Asia and the Indian subcontinent during the Oligocene that continued until the Middle Miocene. This corroborates recent geological models that argue for a much later final collision between the continental plates. We predict that the Oligocene faunal exchange between the Indian subcontinent and Asia, as shown here for rhacophorid frogs, also applies for other nonvolant organisms with an Indian-Asian distribution, and suggest that previous studies that deal with this faunal interchange should be carefully reinvestigated.

译文

:印度次大陆向欧亚大陆的积聚引发了大规模的动植物交流,冈瓦南分类群进入了亚洲,反之亦然。关于印度与亚洲碰撞的传统观点认为,始新世初期大陆板块是相互接触的。许多生物地理学研究都依赖于这种假设。然而,这一地质事件的确切模式和时机仍在争论中。在这里,我们基于对横纹蛙的广泛系统发育分析,来解决东南亚和印度之间是否存在古基因生物地理联系的问题。 Rhacophoridae内印度和欧亚大陆之间的动物交流方向是什么?动物群交换的时间是否与最近建议的地质模型之一相关。根据化石记录重建的结果,纹树蛙显示出从印度到亚洲的早期传播,传播时间为46至57 Ma。然而,在始新世中期,动物群交换停止了,随后在渐新世直到亚洲中新世为止,亚洲和印度次大陆之间的横纹肌发散事件增加了。这证实了最近的地质模型,这些模型认为大陆板块之间的最终碰撞要晚得多。我们预测,印度次大陆与亚洲之间的渐新世动物群交换(如此处所示的横纹蛙)也适用于其他具有印度-亚洲分布的非挥发性生物,并建议应对先前有关这种动物群交换的研究进行仔细的研究。

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