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\begin{document}

\title{Genomic divergence of Stellera chamaejasme through local selection on
the Qinghai-Tibet Plateau and adjacent regions}



\author[1]{Hongyin Hu}%
\author[1]{Yongzhi Yang}%
\author[1]{Ao Li}%
\author[1]{Zeyu Zheng}%
\author[1]{Jin Zhang}%
\author[2]{Jianquan Liu}%
\affil[1]{Lanzhou University}%
\affil[2]{Sichuan University}%


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  \date{June 06, 2024}


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\begin{abstract}
Understanding how populations diverge and new species arise is a central
question in evolutionary biology. `Allopatric' divergence through
geographic isolation is considered to be the commonest mechanism
generating species biodiversity in mountainous ecosystems. However, the
underlying genomic dynamics, especially genomic islands of elevated
divergence and genes that are highly diverged as a result of
lineage-specific selection, remain poorly understood. Stellera
chamaejasme is widely distributed on the Qinghai-Tibet Plateau and in
adjacent regions, making it a good model with which to explore genomic
divergence in mountainous ecosystems. We assembled a high-quality,
chromosome-level genome for this species and re-sequenced the genomes of
24 populations across its distributional range. Our population genomic
analyses recovered four distinct genetic lineages corresponding to
geographic distributions with contrasting environments. However, we
revealed that continuous gene flow occurred during the diversification
of these four lineages and inter-lineage hybrids, and plastome
introgressions were frequently found in regions of contact. The elevated
genomic divergences were highly heterogeneous across the genome. The
formation of such genomic islands showed neither correlation with rate
of gene flow nor relationship to time of divergence. The
lineage-specific positively selected genes potentially involved in local
adaptation were found both within and outside genomic islands. Our
results suggest that genomic divergence in S. chamaejasme is likely to
have been triggered and further maintained by local selection in
addition to geographic isolation.%
\end{abstract}%



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\textbf{Hosted file}

\verb`Molecular Ecology-Speciation-Stellera chamaejasme genome-Manuscript.doc`  available at \url{https://authorea.com/users/471623/articles/562997-genomic-divergence-of-stellera-chamaejasme-through-local-selection-on-the-qinghai-tibet-plateau-and-adjacent-regions}\selectlanguage{english}
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