Biogeographical network analysis of Cretaceous Australian dinosaurs

Biogeographical network analysis of Cretaceous Australian dinosaurs
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白垩纪澳大利亚恐龙的生物地理网络分析

DOI:
10.1016/j.gr.2019.12.012
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发表时间:
2020
期刊:
影响因子:
6.1
通讯作者:
Kubo Tai
Kubo Tai
中科院分区:
地球科学1区
文献类型:
--
作者:
仲吉朝希;鰐田皓太;加藤紘一;栗本英治;小田彰史;Kubo Tai

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白垩纪澳大利亚恐龙区系的生物地理特征有地方性的、世界性的或与其它冈瓦纳区系密切相关的。在过去的十年中,大量新的澳大利亚恐龙分类群被描述并纳入系统发育分析,从而获得了对其生物地理亲缘关系的新见解。在这里,我将最新的澳大利亚恐龙系统发生学结合成一棵超级树,其中包含了尽可能多的澳大利亚分类群,并将其应用于白垩纪恐龙生物地理网络的构建。结果表明,澳大利亚的白垩纪恐龙与南美洲的恐龙有很强的联系,并通过南美洲与其他冈瓦纳大陆的恐龙有很强的联系。群落检测算法表明,冈瓦纳大陆在白垩纪恐龙生物地理网络中形成了一个群落。以往研究中发现的澳大利亚与Laurasia在生物地理上的亲缘关系,很大程度上是由于当时冈瓦纳恐龙化石记录的稀缺,以及由于化石的碎片性,澳大利亚恐龙的系统发育地位不稳定。澳大利亚新分类群的不断发现和由此产生的系统发育分析的完善可以进一步加深我们对澳大利亚生物地理历史的理解。
The biogeography of Cretaceous Australian dinosaur fauna has been characterized variously as endemic, cosmopolitan or closely related to other Gondwanan faunas. Over the past decade, a large number of new Australian dinosaur taxa have been described and included in phylogenetic analyses, allowing for new insights into their biogeographical affinities to be obtained. Here, I combine the latest phylogenies of Australian dinosaurs into a supertree that includes as many Australian taxa as possible and apply it to the construction of biogeographical networks of Cretaceous dinosaurs. The results show that the Cretaceous dinosaurs of Australia have a strong connection with South American dinosaurs and to those of other Gondwanan continents via South America. Community detection algorithms indicate that the Gondwanan continents form a community within Cretaceous dinosaur biogeographical networks. The biogeographical affinities between Australia and Laurasia detected in previous studies were largely due to the scarce dinosaur fossil record of Gondwana at that time and to the unstable phylogenetic position of Australian dinosaurs because of the fragmentary nature of their fossils. Continuing discoveries of new Australian taxa and refinement of resulting phylogenetic analyses can further deepen our understanding of the biogeographical history of Australia.
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