Testing Synchrony in Historical Biogeography: The Case of New World Primates and Hystricognathi Rodents
Testing Synchrony in Historical Biogeography: The Case of New World Primates and Hystricognathi Rodents
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DOI：
10.4137/ebo.s9008
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发表时间：
2012-01-01
影响因子：
2.6
通讯作者：
Schrago, Carlos G.
中科院分区：
文献类型：
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作者：
Loss-Oliveira, Leticia;Aguiar, Barbara O.;Schrago, Carlos G.
南美洲渐新世早期沉积物中突然出现的灵长类动物和长颌啮齿类动物一直困扰着乳动物学家数十年。基于始新世/渐新世过渡时期发生的地理气候变化可能有利于它们的扩散，研究人员提出了这些群体同步到达的假设。然而，阔草和豚草同时起源于南美的假说尚未得到明确评估。我们这项工作的目的是将同步发散时间的正式测试应用于扁鼻属和豚形属分裂。我们已经研究了之前关于阔嘴科和颌科起源的工作，将测试应用于已知发生同步的情况，并进行模拟以表明可以正式测试同步节点的年龄。我们表明，扁鼻类/卡他类和卡维奥类/鮈类类分裂的绝对年龄取决于数据划分，并且所应用的测试一致地检测到已知发生的同步事件。灵长类动物和颌类动物到达新大陆是由一个独特事件组成的假设是不能被拒绝的。
The abrupt appearance of primates and hystricognath rodents in early Oligocene deposits of South America has puzzled mastozoologists for decades. Based on the geoclimatic changes that occurred during the Eocene/Oligocene transition period that may have favoured their dispersal, researchers have proposed the hypothesis that these groups arrived in synchrony. Nevertheless, the hypothesis of synchronous origins of platyrrhine and caviomorph in South America has not been explicitly evaluated. Our aim in this work was to apply a formal test for synchronous divergence times to the Platyrrhini and Caviomorpha splits. We have examined a previous work on platyrrhine and hystricognath origins, applied the test to a case where synchrony is known to occur and conducted simulations to show that it is possible to formally test the age of synchronous nodes. We show that the absolute ages of Platyrrhini/Catarrhini and Caviomorpha/Phiomorpha splits depend on data partitioning and that the test applied consistently detected synchronous events when they were known to have happened. The hypothesis that the arrival of primates and hystricognaths to the New World consisted of a unique event cannot be rejected.