Drivers of genomic landscapes of differentiation across a populus divergence gradient

Document Type

Journal Article

Publication Title

Molecular Ecology

Volume

32

Issue

15

First Page

4348

Last Page

4361

PubMed ID

37271855

Publisher

Wiley

School

School of Science

RAS ID

60260

Funders

China Scholarship Council / Swiss National Science Foundation

Comments

Shang, H., Field, D. L., Paun, O., Rendón-Anaya, M., Hess, J., Vogl, C., . . . Leroy, T. (2023). Drivers of genomic landscapes of differentiation across a populus divergence gradient. Molecular Ecology, 32(15), 4348-4361. https://doi.org/10.1111/mec.17034

Abstract

Speciation, the continuous process by which new species form, is often investigated by looking at the variation of nucleotide diversity and differentiation across the genome (hereafter genomic landscapes). A key challenge lies in how to determine the main evolutionary forces at play shaping these patterns. One promising strategy, albeit little used to date, is to comparatively investigate these genomic landscapes as progression through time by using a series of species pairs along a divergence gradient. Here, we resequenced 201 whole-genomes from eight closely related Populus species, with pairs of species at different stages along the divergence gradient to learn more about speciation processes. Using population structure and ancestry analyses, we document extensive introgression between some species pairs, especially those with parapatric distributions. We further investigate genomic landscapes, focusing on within-species (i.e. nucleotide diversity and recombination rate) and among-species (i.e. relative and absolute divergence) summary statistics of diversity and divergence. We observe relatively conserved patterns of genomic divergence across species pairs. Independent of the stage across the divergence gradient, we find support for signatures of linked selection (i.e. the interaction between natural selection and genetic linkage) in shaping these genomic landscapes, along with gene flow and standing genetic variation. We highlight the importance of investigating genomic patterns on multiple species across a divergence gradient and discuss prospects to better understand the evolutionary forces shaping the genomic landscapes of diversity and differentiation.

DOI

10.1111/mec.17034

Access Rights

subscription content

Link to Full Text

Share

 
COinS