Post-extinction diversification patterns of brachiopods in the early-middle Llandovery, Silurian
Post-extinction diversification patterns of brachiopods in the early-middle Llandovery, Silurian
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志留纪兰多弗里早中期腕足动物灭绝后的多样化模式
DOI：
10.1016/j.palaeo.2017.12.025
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Rong Jia-Yu
中科院分区：
文献类型：
--
作者：
Huang Bing;Jin Jisuo;Rong Jia-Yu
通过对志留纪早期（Rhuddanian-Aeronian）全球腕足动物出现的网络和频率分布分析，揭示了早-晚Rhuddanian期间腕足动物从奥陶世末大灭绝中恢复主要表现为晚奥陶世世界性保留类群的重建。腕足类的属的多样性几乎翻了一番，从Rhuddanian到Aeronian，由于辐射的地方性和世界性的类群，与全球环境的整体冰后期改善和增加的栖息地异质性，由于海洋海侵和扩张的epeiric海。在奥陶纪末期大灭绝之后的几百万年，在Aeronian发生了从奥陶纪型到志留纪型腕足动物群的剧烈更替。与奥陶纪以辐射状为主的orthides和strophomenides相比，atrypides和pentamerides从Rhuddanian到Aeronian显示出剧烈的变化，主要分布在热带古板块，成为志留纪最丰富和多样的腕足动物。Atrypides恢复在早期Rhuddanian，而pentamerides的多样化被推迟，直到Aeronian和成为广泛分布在中国南部，哈萨克斯坦，波罗的海，阿瓦隆尼亚，劳伦特。
Network and frequency distribution analyses of global brachiopod occurrences in the earliest Silurian (Rhuddanian–Aeronian) revealed that brachiopod recovery from the end-Ordovician mass extinction during the early–late Rhuddanian was represented mainly by the reestablishment of Late Ordovician cosmopolitan holdover taxa. Brachiopods nearly doubled their generic diversity from Rhuddanian to Aeronian, owing to the radiation of both endemic and cosmopolitan taxa, associated with an overall post-glacial amelioration of global environment and increased habitat heterogeneity as a result of marine transgressions and expansion of epeiric seas. A drastic turnover from the Ordovician-type to Silurian-type brachiopod faunas took place in the Aeronian, several million years after the terminal Ordovician mass extinction. Compared with the orders of orthides and strophomenides that radiated and predominated in the Ordovician, the atrypides and pentamerides displayed pulses of drastic diversification from the Rhuddanian to Aeronian, mainly in tropically located paleoplates, to become the most abundant and diverse brachiopod orders in the Silurian. Atrypides recovered in the early Rhuddanian, whereas diversification of pentamerides was delayed until the Aeronian and becoming widespread in South China, Kazakhstan terranes, Baltica, Avalonia, and Laurentia.