Nested radiations and the pulse of angiosperm diversification: increased diversification rates often follow whole genome duplications.
Nested radiations and the pulse of angiosperm diversification: increased diversification rates often follow whole genome duplications.
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DOI：
10.1111/nph.13491
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
David C. Tank;J. Eastman;Matthew W. Pennell;P. Soltis;D. Soltis;Cody E. Hinchliff;Joseph W. Brown;Emily B. Sessa;L. Harmon
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文献类型：
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作者：
David C. Tank;J. Eastman;Matthew W. Pennell;P. Soltis;D. Soltis;Cody E. Hinchliff;Joseph W. Brown;Emily B. Sessa;L. Harmon
我们对植物生命树的理解不断加深，这为揭示被子植物多样性的主要驱动力提供了一个新的机会。使用时间校准的进化，我们的特点是热点和冷点的谱系多样化的被子植物生命树的逐步AIC（MEDUSA）的进化多样化建模。我们还测试了全基因组复制（WGD）辐射滞后时间模型，该模型假设多样化的增加往往滞后于既定的WGD事件。在被子植物的整个进化历史中，多样化率一直是令人难以置信的异质性，并揭示了一种“嵌套辐射”的模式--嵌套在其他辐射中的净多样化增加。这种模式反过来又产生了分支年龄和多样性之间的负相关关系，在家庭和订单。我们认为，随机变化的多样化率在整个生育期解释了这些模式。最后，我们展示了显着的统计支持WGD辐射滞后时间模型。在被子植物中，多样化的嵌套变化导致了净多样化的总体增长率和相对灭绝率的下降。这些多样化转变很少与WGD事件完全相关，但通常在滞后期之后。
Our growing understanding of the plant tree of life provides a novel opportunity to uncover the major drivers of angiosperm diversity. Using a time-calibrated phylogeny, we characterized hot and cold spots of lineage diversification across the angiosperm tree of life by modeling evolutionary diversification using stepwise AIC (MEDUSA). We also tested the whole-genome duplication (WGD) radiation lag-time model, which postulates that increases in diversification tend to lag behind established WGD events. Diversification rates have been incredibly heterogeneous throughout the evolutionary history of angiosperms and reveal a pattern of 'nested radiations' - increases in net diversification nested within other radiations. This pattern in turn generates a negative relationship between clade age and diversity across both families and orders. We suggest that stochastically changing diversification rates across the phylogeny explain these patterns. Finally, we demonstrate significant statistical support for the WGD radiation lag-time model. Across angiosperms, nested shifts in diversification led to an overall increasing rate of net diversification and declining relative extinction rates through time. These diversification shifts are only rarely perfectly associated with WGD events, but commonly follow them after a lag period.