Explosive diversification of marine fishes at the Cretaceous-Palaeogene boundary
Explosive diversification of marine fishes at the Cretaceous-Palaeogene boundary
复制标题
DOI：
10.1038/s41559-018-0494-6
复制
发表时间：
2018-04-01
影响因子：
16.8
通讯作者：
Near, Thomas J.
中科院分区：
文献类型：
--
作者：
Alfaro, Michael E.;Faircloth, Brant C.;Near, Thomas J.
古近纪（K-Pg）大规模灭绝与陆地脊椎动物中生态上不同的高等类群（例如科和目）的迅速出现有关，但其对海洋脊椎动物多样化的影响不太清楚。棘射线鱼类（棘形目）提供了一个理想的系统，探索的影响，K-Pg鱼类多样化，但尽管几十年的形态和分子系统发育的努力，分辨率早期分歧的谱系和巨大的不同亚支仍然存在问题。最近的多位点研究提供了第一个解决的系统发育骨干棘形，并建议主要谱系之间的新关系。然而，这些新的关系和相关的时间尺度还没有被询问使用基因组学方法。在这里，我们使用目标富集>1,000个超保守元素，结合发散时间分析，以解决120个主要棘状体谱系之间的关系，并为棘状体辐射提供新的时间尺度。我们的研究结果包括一个很好的支持拓扑结构，强烈解决关系沿着的acanthomorph骨干和六个主要percomorph子分支内的几个新的关系的恢复。分歧时间分析还表明，冠年龄为5个这些分支，并在第六大部分的物种多样性，与K-PG边界相吻合，解剖学和生态学上独特的超家族分支之间的分歧集中在第一个1000万年的新生代。
The Cretaceous-Palaeogene (K-Pg) mass extinction is linked to the rapid emergence of ecologically divergent higher taxa (for example, families and orders) across terrestrial vertebrates, but its impact on the diversification of marine vertebrates is less clear. Spiny-rayed fishes (Acanthomorpha) provide an ideal system for exploring the effects of the K-Pg on fish diversification, yet despite decades of morphological and molecular phylogenetic efforts, resolution of both early diverging lineages and enormously diverse subclades remains problematic. Recent multilocus studies have provided the first resolved phylogenetic backbone for acanthomorphs and suggested novel relationships among major lineages. However, these new relationships and associated timescales have not been interrogated using phylogenomic approaches. Here, we use targeted enrichment of >1,000 ultraconserved elements in conjunction with a divergence time analysis to resolve relationships among 120 major acanthomorph lineages and provide a new timescale for acanthomorph radiation. Our results include a well-supported topology that strongly resolves relationships along the acanthomorph backbone and the recovery of several new relationships within six major percomorph subclades. Divergence time analyses also reveal that crown ages for five of these subclades, and for the bulk of the species diversity in the sixth, coincide with the K-Pg boundary, with divergences between anatomically and ecologically distinctive suprafamilial clades concentrated in the first 10 million years of the Cenozoic.