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Article Dans Une Revue Zoological Journal of the Linnean Society Année : 2023

Delimiting phylogeographic diversity in the genomic era: application to an Iberian endemic frog

Christophe Dufresnes
Johanna Ambu
Pedro Galán
Fernando Sequeira
Leticia Viesca
  • Fonction : Auteur
Magdalena Choda
David Álvarez
  • Fonction : Auteur
Bérénice Alard
Tomasz Suchan
Sven Künzel
Iñigo Martínez-Solano
Miguel Vences
Alfredo Nicieza

Résumé

The rich genetic and phenotypic diversity of species complexes is best recognized through formal taxonomic naming, but one must first assess the evolutionary history of phylogeographic lineages to identify and delimit candidate taxa. Using genomic markers, mitochondrial DNA barcoding, and morphometric analyses, we examined lineage diversity and distribution in the Iberian endemic frog Rana parvipalmata. We confirmed two deep phylogeographic lineages, one relatively homogenous genetically, found in Asturias and adjacent areas (T2), and one more fragmented and locally genetically impoverished, restricted to Galicia (T1). Analyses of their hybrid zone suggested a shallow transition characterized by far-ranging admixture, which was modelled by a wide geographic cline (~60 km for the genome average) and no obvious barrier loci (i.e. loci showing disproportionally restricted introgression). The relatively young T1 and T2 have thus remained reproductively compatible, which argues against their distinction as biological species, and we accordingly describe T2 as a new subspecies, Rana parvipalmata asturiensis ssp. nov. Remarkably, we highlight striking discordances between mitochondrial and nuclear distributions across their hybrid zones, as well as between their genetic and morphological differentiation. Our study illustrates how genomic-based phylogeographic frameworks can help decipher the high genetic and phenotypic variation of species complexes and substantiate the taxonomic assessment of candidate lineages.
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Dates et versions

hal-04547720 , version 1 (16-04-2024)

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Christophe Dufresnes, Johanna Ambu, Pedro Galán, Fernando Sequeira, Leticia Viesca, et al.. Delimiting phylogeographic diversity in the genomic era: application to an Iberian endemic frog. Zoological Journal of the Linnean Society, 2023, ⟨10.1093/zoolinnean/zlad170⟩. ⟨hal-04547720⟩
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