The evolutionary dynamics of the early Palaeozoic marine biodiversity accumulation
The evolutionary dynamics of the early Palaeozoic marine biodiversity accumulation
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DOI：
10.1098/rspb.2019.1634
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发表时间：
2019-08-21
影响因子：
4.7
通讯作者：
Rasmussen, Christian M. O.
中科院分区：
文献类型：
--
作者：
Kroger, Bjorn;Franeck, Franziska;Rasmussen, Christian M. O.
早古生代记录了古生代生物多样性的初始阶段。生物多样性的增加涉及分类群寿命的急剧变化，以及起源和灭绝的速度。在这里，我们以前所未有的时间分辨率计算这些变量。我们发现，在寒武纪时期，高度不稳定的起源和灭绝率与短属longevities。在奥陶纪和志留纪时期，进化速率不太波动，属持续的时间越来越长。90%属的寿命从寒武纪晚期的500万年增加到奥陶纪-志留纪时期的1000多万年。广泛的生态系统破坏的间隔与短属longevities在寒武纪和异常高的longevities在奥陶纪和志留纪时期。因此，后寒武纪的属的持久性增加，表明一个不断变化的早古生代海洋生态系统的能力提高，可持续地维持现有的属。这是奥陶纪时期进化的生态系统恢复力达到新水平的证据。
The early Palaeozoic Era records the initial biodiversification of the Phanerozoic. The increase in biodiversity involved drastic changes in taxon longevity, and in rates of origination and extinction. Here, we calculate these variables in unprecedented temporal resolution. We find that highly volatile origination and extinction rates are associated with short genus longevities during the Cambrian Period. During the Ordovician and Silurian periods, evolutionary rates were less volatile and genera persisted for increasingly longer intervals. The 90%-genus life expectancy doubled from 5 Myr in the late Cambrian to more than 10 Myr in the Ordovician-Silurian periods. Intervals with widespread ecosystem disruption are associated with short genus longevities during the Cambrian and with exceptionally high longevities during the Ordovician and Silurian periods. The post-Cambrian increase in persistence of genera, therefore, indicates an elevated ability of the changing early Palaeozoic marine ecosystems to sustainably maintain existing genera. This is evidence of a new level of ecosystem resilience which evolved during the Ordovician Period.