Cargando…

Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species

Contemporary gene flow, when resumed after a period of isolation, can have crucial consequences for endangered species, as it can both increase the supply of adaptive alleles and erode local adaptation. Determining the history of gene flow and thus the importance of contemporary hybridization, howev...

Descripción completa

Detalles Bibliográficos
Autores principales: Dittberner, Hannes, Tellier, Aurelien, de Meaux, Juliette
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Oxford University Press 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8826969/
https://www.ncbi.nlm.nih.gov/pubmed/35084503
http://dx.doi.org/10.1093/molbev/msac015
_version_ 1784647536000106496
author Dittberner, Hannes
Tellier, Aurelien
de Meaux, Juliette
author_facet Dittberner, Hannes
Tellier, Aurelien
de Meaux, Juliette
author_sort Dittberner, Hannes
collection PubMed
description Contemporary gene flow, when resumed after a period of isolation, can have crucial consequences for endangered species, as it can both increase the supply of adaptive alleles and erode local adaptation. Determining the history of gene flow and thus the importance of contemporary hybridization, however, is notoriously difficult. Here, we focus on two endangered plant species, Arabis nemorensis and A. sagittata, which hybridize naturally in a sympatric population located on the banks of the Rhine. Using reduced genome sequencing, we determined the phylogeography of the two taxa but report only a unique sympatric population. Molecular variation in chloroplast DNA indicated that A. sagittata is the principal receiver of gene flow. Applying classical D-statistics and its derivatives to whole-genome data of 35 accessions, we detect gene flow not only in the sympatric population but also among allopatric populations. Using an Approximate Bayesian computation approach, we identify the model that best describes the history of gene flow between these taxa. This model shows that low levels of gene flow have persisted long after speciation. Around 10 000 years ago, gene flow stopped and a period of complete isolation began. Eventually, a hotspot of contemporary hybridization was formed in the unique sympatric population. Occasional sympatry may have helped protect these lineages from extinction in spite of their extremely low diversity.
format Online
Article
Text
id pubmed-8826969
institution National Center for Biotechnology Information
language English
publishDate 2022
publisher Oxford University Press
record_format MEDLINE/PubMed
spelling pubmed-88269692022-02-10 Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species Dittberner, Hannes Tellier, Aurelien de Meaux, Juliette Mol Biol Evol Discoveries Contemporary gene flow, when resumed after a period of isolation, can have crucial consequences for endangered species, as it can both increase the supply of adaptive alleles and erode local adaptation. Determining the history of gene flow and thus the importance of contemporary hybridization, however, is notoriously difficult. Here, we focus on two endangered plant species, Arabis nemorensis and A. sagittata, which hybridize naturally in a sympatric population located on the banks of the Rhine. Using reduced genome sequencing, we determined the phylogeography of the two taxa but report only a unique sympatric population. Molecular variation in chloroplast DNA indicated that A. sagittata is the principal receiver of gene flow. Applying classical D-statistics and its derivatives to whole-genome data of 35 accessions, we detect gene flow not only in the sympatric population but also among allopatric populations. Using an Approximate Bayesian computation approach, we identify the model that best describes the history of gene flow between these taxa. This model shows that low levels of gene flow have persisted long after speciation. Around 10 000 years ago, gene flow stopped and a period of complete isolation began. Eventually, a hotspot of contemporary hybridization was formed in the unique sympatric population. Occasional sympatry may have helped protect these lineages from extinction in spite of their extremely low diversity. Oxford University Press 2022-01-27 /pmc/articles/PMC8826969/ /pubmed/35084503 http://dx.doi.org/10.1093/molbev/msac015 Text en © The Author(s) 2022. Published by Oxford University Press on behalf of the Society for Molecular Biology and Evolution. https://creativecommons.org/licenses/by-nc/4.0/This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com
spellingShingle Discoveries
Dittberner, Hannes
Tellier, Aurelien
de Meaux, Juliette
Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species
title Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species
title_full Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species
title_fullStr Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species
title_full_unstemmed Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species
title_short Approximate Bayesian Computation Untangles Signatures of Contemporary and Historical Hybridization between Two Endangered Species
title_sort approximate bayesian computation untangles signatures of contemporary and historical hybridization between two endangered species
topic Discoveries
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8826969/
https://www.ncbi.nlm.nih.gov/pubmed/35084503
http://dx.doi.org/10.1093/molbev/msac015
work_keys_str_mv AT dittbernerhannes approximatebayesiancomputationuntanglessignaturesofcontemporaryandhistoricalhybridizationbetweentwoendangeredspecies
AT tellieraurelien approximatebayesiancomputationuntanglessignaturesofcontemporaryandhistoricalhybridizationbetweentwoendangeredspecies
AT demeauxjuliette approximatebayesiancomputationuntanglessignaturesofcontemporaryandhistoricalhybridizationbetweentwoendangeredspecies