Evidence of introgressive hybridization between the morphologically divergent land snails Ainohelix and Ezohelix

Morii, Yuta and Yokoyama, Jun and Kawata, Masakado and Davison, Angus and Satoshi, Chiba (2015) Evidence of introgressive hybridization between the morphologically divergent land snails Ainohelix and Ezohelix. Biological Journal of the Linnean Society, 115 (1). pp. 77-95. ISSN 1095-8312

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Abstract

Hybridization between different taxa is likely to take place when adaptive morphological differences evolve more rapidly than reproductive isolation. When studying the phylogenetic relationship between two land snails of different nominal genera, Ainohelix editha and Ezohelix gainesi, from Hokkaido, Japan, using nuclear internal transcribed spacer and mitochondrial 16S ribosomal DNA, we found a marked incongruence in the topology between nuclear and mitochondrial phylogenies. Furthermore, no clear association was found between shell morphology (which defines the taxonomy) and nuclear or mitochondrial trees and morphology of reproductive system. These patterns are most likely explained by historical introgressive hybridization between A. editha and E. gainesi. Because the shell morphologies of the two species are quite distinct, even when they coexist, the implication is that natural selection is able to maintain (or has recreated) distinct morphologies in the face of gene flow. Future studies may be able to reveal the regions of the genome that maintain the morphological differences between these species.

Item Type: Article
Keywords: ancestral, ancestral hybridization, Bradybaenidae, phenotypic evolution, phylogeny, speciation
Schools/Departments: University of Nottingham UK Campus > Faculty of Medicine and Health Sciences > School of Life Sciences
Identification Number: https://doi.org/10.1111/bij.12466
Depositing User: Davison, Angus
Date Deposited: 21 Jun 2016 10:02
Last Modified: 14 Sep 2016 10:35
URI: http://eprints.nottingham.ac.uk/id/eprint/34169

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