Extensive host-switching of avian feather lice following the Cretaceous-Paleogene mass extinction event
Extensive host-switching of avian feather lice following the Cretaceous-Paleogene mass extinction event
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DOI：
10.1038/s42003-019-0689-7
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发表时间：
2019-11-29
影响因子：
5.9
通讯作者：
Johnson, Kevin P.
中科院分区：
文献类型：
--
作者：
de Moya, Robert S.;Allen, Julie M.;Johnson, Kevin P.
几乎所有的鸟类都寄生有羽虱。根据最近的基因组研究，现代鸟类的三个主要谱系在白垩纪-古近纪（K-Pg）大灭绝事件之前彼此分化。与此相反，对鸟类羽虱繁殖的研究表明，这些寄生虫在这一事件后大量多样化。然而，这些研究无法重建羽毛虱的祖先鸟类宿主谱系。在这里，我们使用多种虱子的基因组序列来重建基于1,075个基因的遗传学。通过比较这虱子进化树的鸟类宿主树，我们表明，羽虱开始多样化的水禽和陆禽的共同祖先，然后辐射到其他鸟类谱系广泛的主机切换。测年分析和同源性比较显示，在K-Pg边界之前分叉的三个鸟类谱系中有两个在此事件后通过宿主转换获得了它们的羽虱。
Nearly all lineages of birds host parasitic feather lice. Based on recent phylogenomic studies, the three major lineages of modern birds diverged from each other before the Cretaceous-Paleogene (K-Pg) mass extinction event. In contrast, studies of the phylogeny of feather lice on birds, indicate that these parasites diversified largely after this event. However, these studies were unable to reconstruct the ancestral avian host lineage for feather lice. Here we use genome sequences of a broad diversity of lice to reconstruct a phylogeny based on 1,075 genes. By comparing this louse evolutionary tree to the avian host tree, we show that feather lice began diversifying on the common ancestor of waterfowl and landfowl, then radiated onto other avian lineages by extensive host-switching. Dating analyses and cophylogenetic comparisons revealed that two of three lineages of birds that diverged before the K-Pg boundary acquired their feather lice after this event via host-switching.