A phylogenomic investigation into the biogeography of the Mexico–eastern U.S. disjunction in Symphyotrichum

IF 2.4 2区 生物学 Q2 PLANT SCIENCES
Sushil Dahal, Carolina M. Siniscalchi, Ryan A. Folk
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引用次数: 0

Abstract

Premise

Biotic disjunctions have attracted scientific attention for the past 200 years. Despite being represented in many familiar plants (such as bald cypress, flowering dogwood, sweetgum, partridgeberry, etc.), the eastern North American (ENA)–Mexican (M) disjunction remains poorly understood. Major outstanding questions include the divergence times of taxa exhibiting the disjunction and environmental/geological processes that may underlie the disjunction. Symphyotrichum Nees (Asteraceae), one of the most diverse genera in the eastern USA, displays several examples of disjunct ENA–M taxa.

Methods

We generated target capture data using the Angiosperms353 baitset and generated the first well-sampled phylogenomic hypothesis for Symphyotrichum and its close relatives. Focusing on S. subgenus Virgulus, we used MCMCTREE to perform divergence time estimation and the R package BioGeoBEARS to infer ancestral regions and biogeographic transitions between North America and Mexico. Finally, we used the ancestral niche reconstruction method Utremi to test for a role of historical aridification in generating the disjunction.

Results

Our molecular data suggest a recent radiation of Symphyotrichum at the Plio-Pleistocene boundary (~2.5 mya), with early connections to Mexico in ancestral lineages that closed off shortly after and were followed by vicariance across this region. Except for some present-day broadly distributed species, there is a complete lack of movement between ENA and M after ~0.5 mya.

Conclusions

A reconstructed disjunct distribution of suitable habitat in Pleistocene climatic models corroborates results from biogeographic modeling and confirms glacial cycles are more likely to be associated with the breakup of ENA–M biogeographic connections.

墨西哥-美国东部合欢属生物地理学的系统基因组学研究。
前提:在过去的200年里,生物断裂引起了科学界的关注。尽管在许多熟悉的植物(如秃柏树、开花山茱萸、甜桉树、鹧鸪等)中都有代表,但北美东部(ENA)-墨西哥(M)的分离仍然知之甚少。主要悬而未决的问题包括显示分离的分类群的分离时间和可能导致分离的环境/地质过程。美国东部最具多样性的菊科属之一——合欢属(Symphyotrichum Nees)显示了几个分离的ENA-M分类群。方法:利用Angiosperms353诱捕物获得目标捕获数据,并建立首个完整采样的共生菌及其近缘种系统基因组假说。以S. Virgulus亚属为研究对象,利用MCMCTREE进行发散时间估计,并利用R软件包biogeobars推断北美和墨西哥之间的祖先区域和生物地理过渡。最后,我们使用原始生态位重建方法Utremi来测试历史干旱化在产生分离中的作用。结果:我们的分子数据表明,最近在上新世-更新世边界(~2.5万年)有一种symphytrichum的辐射,在祖先谱系中与墨西哥的早期联系在不久之后关闭,随后在该地区发生了迁移。除了一些现今广泛分布的物种外,在~0.5万年之后,ENA和M之间完全没有运动。结论:在更新世气候模型中重建的适宜生境的间断分布证实了生物地理模型的结果,并证实了冰期旋回更可能与ENA-M生物地理连接的断裂有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
American Journal of Botany
American Journal of Botany 生物-植物科学
CiteScore
4.90
自引率
6.70%
发文量
171
审稿时长
3 months
期刊介绍: The American Journal of Botany (AJB), the flagship journal of the Botanical Society of America (BSA), publishes peer-reviewed, innovative, significant research of interest to a wide audience of plant scientists in all areas of plant biology (structure, function, development, diversity, genetics, evolution, systematics), all levels of organization (molecular to ecosystem), and all plant groups and allied organisms (cyanobacteria, algae, fungi, and lichens). AJB requires authors to frame their research questions and discuss their results in terms of major questions of plant biology. In general, papers that are too narrowly focused, purely descriptive, natural history, broad surveys, or that contain only preliminary data will not be considered.
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