Fifteen shades of green: The evolution of Bufotes toads revisited.

Détails

ID Serval
serval:BIB_1920ABD4EE7F
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Fifteen shades of green: The evolution of Bufotes toads revisited.
Périodique
Molecular phylogenetics and evolution
Auteur(s)
Dufresnes C., Mazepa G., Jablonski D., Caliari Oliveira R., Wenseleers T., Shabanov D.A., Auer M., Ernst R., Koch C., Ramírez-Chaves H.E., Patrick Mulder K., Simonov E., Tiutenko A., Kryvokhyzha D., Louis Wennekes P., Zinenko O.I., Korshunov O.V., Al-Johany A.M., Peregontsev E.A., Masroor R., Betto-Colliard C., Denoël M., Borkin L.J., Skorinov D.V., Pasynkova R.A., Mazanaeva L.F., Rosanov J.M., Dubey S., Litvinchuk S.
ISSN
1095-9513 (Electronic)
ISSN-L
1055-7903
Statut éditorial
In Press
Peer-reviewed
Oui
Pages
106615
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: aheadofprint
Résumé
The radiation of Palearctic green toads (Bufotes) holds great potential to evaluate the role of hybridization in phylogeography at multiple stages along the speciation continuum. With fifteen species representing three ploidy levels, this model system is particularly attractive to examine the causes and consequences of allopolyploidization, a prevalent yet enigmatic pathway towards hybrid speciation. Despite substantial efforts, the evolutionary history of this species complex remains largely blurred by the lack of consistency among the corresponding literature. To get a fresh, comprehensive view on Bufotes phylogeography, here we combined genome-wide multilocus analyses (RAD-seq) with an extensive compilation of mitochondrial, genome size, niche modelling, distribution and phenotypic (bioacoustics, morphometrics, poison composition) datasets, representing hundreds of populations throughout Eurasia. We provide a fully resolved nuclear phylogeny for Bufotes and highlight exceptional cyto-nuclear discordances characteristic of complete mtDNA replacement (in 20% of species), mitochondrial surfing during post-glacial expansions, and the formation of homoploid hybrid populations. Moreover, we traced the origin of several allopolyploids down to species level, showing that all were exclusively fathered by the West Himalayan B. latastii but mothered by several diploid forms inhabiting Central Asian lowlands, an asymmetry consistent with hypotheses on mate choice and Dobzhansky-Muller incompatibilities. Their intermediate call phenotypes potentially allowed for rapid reproductive isolation, while toxin compositions converged towards the ecologically-closest parent. Across the radiation, we pinpoint a stepwise progression of reproductive isolation through time, with a threshold below which hybridizability is irrespective of divergence (<6My), above which species barely admix and eventually evolve different mating calls (6-10My), or can successfully cross-breed through allopolyploidization (>15My). Finally, we clarified the taxonomy of Bufotes (including genetic analyses of type series) and formally described two new species, B. cypriensis sp. nov. (endemic to Cyprus) and B. perrini sp. nov. (endemic to Central Asia). Embracing the genomic age, our framework marks the advent of a new exciting era for evolutionary research in these iconic amphibians.
Mots-clé
Bufonidae, Green toads, RAD sequencing, allopolyploidization, cryptic species, hybrid speciation
Pubmed
Création de la notice
11/09/2019 13:32
Dernière modification de la notice
21/09/2019 6:08
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