Population genomics of an exceptional hybridogenetic system of Pelophylax water frogs

BMC Evolutionary Biology
Sylvain DubeyChristophe Dufresnes

Abstract

Hybridogenesis can represent the first stage towards hybrid speciation where the hybrid taxon eventually weans off its parental species. In hybridogenetic water frogs, the hybrid Pelophylax kl. esculentus (genomes RL) usually eliminates one genome from its germline and relies on its parental species P. lessonae (genomes LL) or P. ridibundus (genomes RR) to perpetuate in so-called L-E and R-E systems. But not exclusively: some all-hybrid populations (E-E system) bypass the need for their parental species and fulfill their sexual cycle via triploid hybrid frogs. Genetic surveys are essential to understand the great diversity of these hybridogenetic dynamics and their evolution. Here we conducted such study using RAD-sequencing on Pelophylax from southern Switzerland (Ticino), a geographically-isolated region featuring different assemblages of parental P. lessonae and hybrid P. kl. esculentus. We found two types of hybridogenetic systems in Ticino: an L-E system in northern populations and a presumably all-hybrid E-E system in the closely-related southern populations, where P. lessonae was not detected. In the latter, we did not find evidence for triploid individuals from the population genomic data, but identified a few P. ridibu...Continue Reading

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Citations

Sep 15, 2019·Molecular Phylogenetics and Evolution·Christophe DufresnesSpartak Litvinchuk

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Methods Mentioned

BETA
PCA
PCR
PCRs

Software Mentioned

bModelTest
BEAST
ade4
STRUCTURE
TreeAnnotator
R
STRUCTURE Harvester
adegenet
FastQC
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