Reaching the edge of the speciation continuum: hybridization between three sympatric species of Hyla tree frogs

Détails

ID Serval
serval:BIB_FCDDC054D510
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Reaching the edge of the speciation continuum: hybridization between three sympatric species of Hyla tree frogs
Périodique
Biological Journal of the Linnean Society
Auteur(s)
Drillon O., Dufresnes G., Perrin N., Crochet P.-A., Dufresnes C.
ISSN
1095-8312
ISSN-L
0024-4066
Statut éditorial
Publié
Date de publication
27/03/2019
Peer-reviewed
Oui
Volume
126
Numéro
4
Pages
743-750
Langue
anglais
Résumé
Alloparapatric species meeting in secondary contact zones are evolutionary witnesses to how reproductive isolation progresses over time and space. Western Palearctic tree frogs (Hyla) are phenotypically similar and all the species pairs tested can hybridize and eventually admix at range margins. All except one. The early-diverged Hyla meridionalis exhibits sharp phenotypic differences: a “long” breeding call and the absence of a lateral stripe. In southwestern Europe, this species co-occurs with the “short-call” striped tree frogs H. arborea and H. molleri, two expanding lineages that admix at their parapatric margins. We estimated local gene flow between these three taxa at several syntopic breeding sites in western France. We congruently matched genotypes to phenotypes: the “short-call” striped individuals were a nuclear mixture of H. arborea and H. molleri; the “long-call” stripeless individuals all featured pure H. meridionalis nuclear ancestry and mtDNA, confirming complete genetic isolation from H. arborea/molleri. Yet, we documented an F1 hybrid between a female H. arborea/molleri and a male H. meridionalis: an incompletely-striped male with an intermediate breeding call. These findings suggest H. meridionalis is still able to reproduce with parapatric congeneric species despite 20My of divergence and strong phenotypic differentiation, but that intrinsic incompatibilities (sterility) prevent genetic introgression.
Mots-clé
amphibians, bioacoustics, hybrid zone, Hyla, population genetics, speciation
Web of science
Création de la notice
29/11/2018 22:34
Dernière modification de la notice
20/08/2019 16:27
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