Diversity partitioning during the Cambrian radiation
Diversity partitioning during the Cambrian radiation
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DOI：
10.1073/pnas.1424985112
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发表时间：
2015-04-14
影响因子：
11.1
通讯作者：
Kiessling, Wolfgang
中科院分区：
文献类型：
--
作者：
Na, Lin;Kiessling, Wolfgang
化石记录为全球多样化过程中生物多样性的环境和地理分区提供了独特的见解。我们探索了寒武纪辐射期间的生物多样性模式，这是地球历史上最引人注目的辐射。我们评估了全球多样性的总体增长如何在社区内（alpha）和社区间（beta）组件之间分配，以及beta多样性如何在环境和地理区域之间分配。寒武纪伽马多样性的变化主要是由β多样性的变化驱动的。在最初的多样化过程中，α和β多样性的组合轨迹表明社区内的竞争低，捕食高。β多样性在环境和地理区域之间有相似的轨迹，但相邻古大陆之间的周转可能是多样化的主要驱动力。我们的研究阐明了寒武纪辐射期全球生物多样性在局部尺度上是由生态位收缩驱动的，在大陆尺度上是由生态位替代驱动的。后者支持了之前关于寒武纪辐射中板块构造重要性的论点，即潘诺蒂亚的解体。
The fossil record offers unique insights into the environmental and geographic partitioning of biodiversity during global diversifications. We explored biodiversity patterns during the Cambrian radiation, the most dramatic radiation in Earth history. We assessed how the overall increase in global diversity was partitioned between within-community (alpha) and between-community (beta) components and how beta diversity was partitioned among environments and geographic regions. Changes in gamma diversity in the Cambrian were chiefly driven by changes in beta diversity. The combined trajectories of alpha and beta diversity during the initial diversification suggest low competition and high predation within communities. Beta diversity has similar trajectories both among environments and geographic regions, but turnover between adjacent paleocontinents was probably the main driver of diversification. Our study elucidates that global biodiversity during the Cambrian radiation was driven by niche contraction at local scales and vicariance at continental scales. The latter supports previous arguments for the importance of plate tectonics in the Cambrian radiation, namely the breakup of Pannotia.