Demographic history shapes genomic ancestry in hybrid zones.
ancestry
genomics
hybrid zones
migration
speciation
Journal
Ecology and evolution
ISSN: 2045-7758
Titre abrégé: Ecol Evol
Pays: England
ID NLM: 101566408
Informations de publication
Date de publication:
Aug 2021
Aug 2021
Historique:
received:
25
03
2021
revised:
03
06
2021
accepted:
08
06
2021
entrez:
9
8
2021
pubmed:
10
8
2021
medline:
10
8
2021
Statut:
epublish
Résumé
Demographic factors such as migration rate and population size can impede or facilitate speciation. In hybrid zones, reproductive boundaries between species are tested and demography mediates the opportunity for admixture between lineages that are partially isolated. Genomic ancestry is a powerful tool for revealing the history of admixed populations, but models and methods based on local ancestry are rarely applied to structured hybrid zones. To understand the effects of demography on ancestry in hybrids zones, we performed individual-based simulations under a stepping-stone model, treating migration rate, deme size, and hybrid zone age as parameters. We find that the number of ancestry junctions (the transition points between genomic regions with different ancestries) and heterogenicity (the genomic proportion heterozygous for ancestry) are often closely connected to demographic history. Reducing deme size reduces junction number and heterogenicity. Elevating migration rate increases heterogenicity, but migration affects junction number in more complex ways. We highlight the junction frequency spectrum as a novel and informative summary of ancestry that responds to demographic history. A substantial proportion of junctions are expected to fix when migration is limited or deme size is small, changing the shape of the spectrum. Our findings suggest that genomic patterns of ancestry could be used to infer demographic history in hybrid zones.
Identifiants
pubmed: 34367575
doi: 10.1002/ece3.7833
pii: ECE37833
pmc: PMC8328415
doi:
Banques de données
Dryad
['10.5061/dryad.3tx95x6gk']
Types de publication
Journal Article
Langues
eng
Pagination
10290-10302Subventions
Organisme : NIGMS NIH HHS
ID : R01 GM120051
Pays : United States
Organisme : NIGMS NIH HHS
ID : R35 GM139412
Pays : United States
Organisme : NIGMS NIH HHS
ID : T32 GM007133
Pays : United States
Informations de copyright
© 2021 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.
Déclaration de conflit d'intérêts
The authors declare no conflict of interest.
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