Genomic Evidence for Speciation with Gene Flow in Broadcast Spawning Marine Invertebrates

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Hirase , S , Yamasaki , Y Y , Sekino , M , Nishisako , M , Ikeda , M , Hara , M , Merilä , J & Kikuchi , K 2021 , ' Genomic Evidence for Speciation with Gene Flow in Broadcast Spawning Marine Invertebrates ' , Molecular Biology and Evolution , vol. 38 , no. 11 , pp. 4683-4699 .

Title: Genomic Evidence for Speciation with Gene Flow in Broadcast Spawning Marine Invertebrates
Author: Hirase, Shotaro; Yamasaki, Yo Y.; Sekino, Masashi; Nishisako, Masato; Ikeda, Minoru; Hara, Motoyuki; Merilä, Juha; Kikuchi, Kiyoshi
Contributor organization: Organismal and Evolutionary Biology Research Programme
Ecological Genetics Research Unit
Date: 2021-11
Language: eng
Number of pages: 17
Belongs to series: Molecular Biology and Evolution
ISSN: 0737-4038
Abstract: How early stages of speciation in free-spawning marine invertebrates proceed is poorly understood. The Western Pacific abalones, Haliotis discus, H. madaka, and H. gigantea, occur in sympatry with shared breeding season and are capable of producing viable F-1 hybrids in spite of being ecologically differentiated. Population genomic analyses revealed that although the three species are genetically distinct, there is evidence for historical and ongoing gene flow among these species. Evidence from demographic modeling suggests that reproductive isolation among the three species started to build in allopatry and has proceeded with gene flow, possibly driven by ecological selection. We identified 27 differentiation islands between the closely related H. discus and H. madaka characterized by high F-ST and d(A), but not high d(XY) values, as well as high genetic diversity in one H. madaka population. These genomic signatures suggest differentiation driven by recent ecological divergent selection in presence of gene flow outside of the genomic islands of differentiation. The differentiation islands showed low polymorphism in H. gigantea, and both high F-ST, d(XY), and d(A) values between H. discus and H. gigantea, as well as between H. madaka and H. gigantea. Collectively, the Western Pacific abalones appear to occupy the early stages speciation continuum, and the differentiation islands associated with ecological divergence among the abalones do not appear to have acted as barrier loci to gene flow in the younger divergences but appear to do so in older divergences.
Subject: marine speciation
ecological speciation
fertilization protein
1181 Ecology, evolutionary biology
Peer reviewed: Yes
Rights: cc_by_nc
Usage restriction: openAccess
Self-archived version: publishedVersion

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