Recent accelerated diversification in rosids occurred outside the tropics
Recent accelerated diversification in rosids occurred outside the tropics
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DOI：
10.1038/s41467-020-17116-5
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发表时间：
2020-07
影响因子：
16.6
通讯作者：
Miao-miao Sun;R. Folk;Matthew A. Gitzendanner;P. Soltis;Zhiduan Chen;D. Soltis;R. Guralnick
中科院分区：
文献类型：
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作者：
Miao-miao Sun;R. Folk;Matthew A. Gitzendanner;P. Soltis;Zhiduan Chen;D. Soltis;R. Guralnick
在不同进化支系的生命中，已经发现了在多样化速率和温度之间相互矛盾的关系。在这里，我们使用了一个包含近20,000种玫瑰的超基质-占所有被子植物物种的约25%的分支-来了解全球多样化模式及其气候关联。我们的方法结合了历史全球温度，物种温度生态位的评估，以及热带和非热带生态位占用的两个大尺度特征。我们发现，在过去1500万年（Myr）与全球温带栖息地扩张相关的冷却期间，大多数亚分支的多样化率急剧增加。气候生态位与多样化率呈负相关，热带道路形成更古老的群落，物种形成率比较冷气候的道路低2倍。我们的研究结果表明，长期的变冷对非热带多样化率产生了不成比例的影响，导致了热带以外充满活力的年轻群落，而热带气候的相对稳定导致了更古老、进化缓慢但物种丰富的群落。
Conflicting relationships have been found between diversification rate and temperature across disparate clades of life. Here, we use a supermatrix comprising nearly 20,000 species of rosids—a clade of ~25% of all angiosperm species—to understand global patterns of diversification and its climatic association. Our approach incorporates historical global temperature, assessment of species’ temperature niche, and two broad-scale characterizations of tropical versus non-tropical niche occupancy. We find the diversification rates of most subclades dramatically increased over the last 15 million years (Myr) during cooling associated with global expansion of temperate habitats. Climatic niche is negatively associated with diversification rates, with tropical rosids forming older communities and experiencing speciation rates ~2-fold below rosids in cooler climates. Our results suggest long-term cooling had a disproportionate effect on non-tropical diversification rates, leading to dynamic young communities outside of the tropics, while relative stability in tropical climes led to older, slower-evolving but still species-rich communities.