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- W3162359531 abstract "Abstract Evidence for ancient interspecific gene flow through hybridization has been reported in many animal and plant taxa based on genetic markers. The study of genomic patterns of closely related species with allopatric distributions allow to assess the relative importance of vicariant isolating events and past gene flow. Here, we investigated the role of gene flow in the evolutionary history of four closely related freshwater fish species with currently allopatric distributions in western Iberian rivers - Squalius carolitertii, S. pyrenaicus, S. torgalensis and S. aradensis - using a population genomics dataset of 23 562 SNPs from 48 individuals, obtained through genotyping by sequencing (GBS). We uncovered a species tree with two well differentiated clades: (i) S. carolitertii and S. pyrenaicus ; and (ii) S. torgalensis and S. aradensis . By using D-statistics and demographic modelling based on the site frequency spectrum, comparing alternative demographic scenarios of hybrid origin, secondary contact and isolation, we found that the S. pyrenaicus North lineage is likely the result of an ancient hybridization event between S. carolitertii (contributing ~84%) and S. pyrenaicus South lineage (contributing ~16%), consistent with a hybrid speciation scenario. Furthermore, in the hybrid lineage we identify outlier loci potentially affected by selection favouring genes from each parental lineage at different genomic regions. Our results suggest that ancient hybridization can affect speciation and that freshwater fish species currently in allopatry are useful to study these processes." @default.
- W3162359531 created "2021-05-24" @default.
- W3162359531 creator A5014101571 @default.
- W3162359531 creator A5035484903 @default.
- W3162359531 creator A5048075811 @default.
- W3162359531 creator A5056136045 @default.
- W3162359531 date "2019-03-22" @default.
- W3162359531 modified "2023-10-18" @default.
- W3162359531 title "Genomic data and multi-species demographic modelling uncover past hybridization between currently allopatric freshwater species" @default.
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- W3162359531 doi "https://doi.org/10.1101/585687" @default.
- W3162359531 hasPublicationYear "2019" @default.
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