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Differential divergence in autosomes and sex chromosomes is associated with intra‐island diversification at a very small spatial scale in a songbird lineage

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Differential divergence in autosomes and sex chromosomes is associated with intra‐island diversification at a very small spatial scale in a songbird lineage. / Bourgeois, Yann Xavier Claude; Bertrand, Joris a M; Delahaie, Boris; Holota, Hélène; Thébaud, Christophe; Milá, Borja.

In: Molecular Ecology, Vol. 29, No. 6, 0, 01.04.2020, p. 1137-1153.

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Bourgeois, Yann Xavier Claude ; Bertrand, Joris a M ; Delahaie, Boris ; Holota, Hélène ; Thébaud, Christophe ; Milá, Borja. / Differential divergence in autosomes and sex chromosomes is associated with intra‐island diversification at a very small spatial scale in a songbird lineage. In: Molecular Ecology. 2020 ; Vol. 29, No. 6. pp. 1137-1153.

Bibtex

@article{97e2801132464883a78d87f295e176e0,
title = "Differential divergence in autosomes and sex chromosomes is associated with intra‐island diversification at a very small spatial scale in a songbird lineage",
abstract = "Recently diverged taxa showing marked phenotypic and ecological diversity are optimal systems to understand the genetic processes underlying speciation. We used genome‐wide markers to investigate the diversification of the Reunion grey white eye (Zosterops borbonicus) on the small volcanic island of Reunion (Mascarene archipelago), where this species complex exhibits four geographic forms that are parapatrically distributed across the island and differ strikingly in plumage colour. One form restricted to the highlands is separated by a steep ecological gradient from three distinct lowland forms which meet at narrow hybrid zones that are not associated with environmental variables. Analyses of genomic variation based on SNP data from genotyping‐by‐sequencing and pooled RADseq approaches, reveal that signatures of selection associated with elevation can be found at multiple regions across the genome, whereas most loci associated with the lowland forms are located on the Z sex chromosome. We identified TYRP1, a Z‐linked colour gene, as a likely candidate locus underlying colour variation among lowland forms. Tests of demographic models revealed that highland and lowland forms diverged in the presence of gene flow, and divergence has progressed as gene flow was restricted by selection at loci across the genome. This system is promising to investigate how adaptation and reproductive isolation shape the genomic landscape of divergence at multiple stages of the speciation process.",
keywords = "genomics, natural selection, plumage colour evolution, population differentiation, sex chromosome, speciation, Zosterops",
author = "Bourgeois, {Yann Xavier Claude} and Bertrand, {Joris a M} and Boris Delahaie and H{\'e}l{\`e}ne Holota and Christophe Th{\'e}baud and Borja Mil{\'a}",
year = "2020",
month = apr,
day = "1",
doi = "10.1111/mec.15396",
language = "English",
volume = "29",
pages = "1137--1153",
journal = "Molecular Ecology",
issn = "0962-1083",
publisher = "Wiley-Blackwell",
number = "6",

}

RIS

TY - JOUR

T1 - Differential divergence in autosomes and sex chromosomes is associated with intra‐island diversification at a very small spatial scale in a songbird lineage

AU - Bourgeois, Yann Xavier Claude

AU - Bertrand, Joris a M

AU - Delahaie, Boris

AU - Holota, Hélène

AU - Thébaud, Christophe

AU - Milá, Borja

PY - 2020/4/1

Y1 - 2020/4/1

N2 - Recently diverged taxa showing marked phenotypic and ecological diversity are optimal systems to understand the genetic processes underlying speciation. We used genome‐wide markers to investigate the diversification of the Reunion grey white eye (Zosterops borbonicus) on the small volcanic island of Reunion (Mascarene archipelago), where this species complex exhibits four geographic forms that are parapatrically distributed across the island and differ strikingly in plumage colour. One form restricted to the highlands is separated by a steep ecological gradient from three distinct lowland forms which meet at narrow hybrid zones that are not associated with environmental variables. Analyses of genomic variation based on SNP data from genotyping‐by‐sequencing and pooled RADseq approaches, reveal that signatures of selection associated with elevation can be found at multiple regions across the genome, whereas most loci associated with the lowland forms are located on the Z sex chromosome. We identified TYRP1, a Z‐linked colour gene, as a likely candidate locus underlying colour variation among lowland forms. Tests of demographic models revealed that highland and lowland forms diverged in the presence of gene flow, and divergence has progressed as gene flow was restricted by selection at loci across the genome. This system is promising to investigate how adaptation and reproductive isolation shape the genomic landscape of divergence at multiple stages of the speciation process.

AB - Recently diverged taxa showing marked phenotypic and ecological diversity are optimal systems to understand the genetic processes underlying speciation. We used genome‐wide markers to investigate the diversification of the Reunion grey white eye (Zosterops borbonicus) on the small volcanic island of Reunion (Mascarene archipelago), where this species complex exhibits four geographic forms that are parapatrically distributed across the island and differ strikingly in plumage colour. One form restricted to the highlands is separated by a steep ecological gradient from three distinct lowland forms which meet at narrow hybrid zones that are not associated with environmental variables. Analyses of genomic variation based on SNP data from genotyping‐by‐sequencing and pooled RADseq approaches, reveal that signatures of selection associated with elevation can be found at multiple regions across the genome, whereas most loci associated with the lowland forms are located on the Z sex chromosome. We identified TYRP1, a Z‐linked colour gene, as a likely candidate locus underlying colour variation among lowland forms. Tests of demographic models revealed that highland and lowland forms diverged in the presence of gene flow, and divergence has progressed as gene flow was restricted by selection at loci across the genome. This system is promising to investigate how adaptation and reproductive isolation shape the genomic landscape of divergence at multiple stages of the speciation process.

KW - genomics

KW - natural selection

KW - plumage colour evolution

KW - population differentiation

KW - sex chromosome

KW - speciation

KW - Zosterops

U2 - 10.1111/mec.15396

DO - 10.1111/mec.15396

M3 - Article

VL - 29

SP - 1137

EP - 1153

JO - Molecular Ecology

JF - Molecular Ecology

SN - 0962-1083

IS - 6

M1 - 0

ER -

ID: 19340072