期刊
HEREDITY
卷 127, 期 4, 页码 401-412出版社
SPRINGERNATURE
DOI: 10.1038/s41437-021-00466-1
关键词
-
资金
- Portuguese National Science Foundation-Fundacao para a Ciencia e a Tecnologia (FCT) [UID/BIA/00329/2013, UIDB/00329/2020]
- FCT [CEECIND/02391/2017, CEECINST/00032/2018/CP1523/CT0008, SFRH/BD/145153/2019]
- EU H2020 program (Marie Sklodowska-Curie grant) [799729]
- FEDER [022153]
- FCT
- Fundação para a Ciência e a Tecnologia [UIDB/00329/2020, PRAXIS XXI/BPD/16303/98, CEECINST/00032/2018/CP1523/CT0008, SFRH/BD/145153/2019] Funding Source: FCT
- Marie Curie Actions (MSCA) [799729] Funding Source: Marie Curie Actions (MSCA)
Evidence of 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 reveals that the S. pyrenaicus North lineage likely resulted from an ancient hybridization event between S. carolitertii and S. pyrenaicus South lineage. Rare variants affected by selection in the hybrid lineage suggest complex genomic interactions between parental lineages.
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 allows the assessment of 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 similar to 84%) and S. pyrenaicus South lineage (contributing similar to 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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据