Combining RADseq and contact zone analysis to decipher cryptic diversification in reptiles: Insights from the Spiny‐footed Lizard (Reptilia, Lacertidae)

Doniol-Valcroze Paul, Rancilhac Loîs, Brito José-Carlos, Miralles Aurélien, Geniez Philippe, Benoit Laure, Loiseau Anne, Leblois Raphaël, Dufresnes Christophe, Crochet Pierre-André. 2024. Combining RADseq and contact zone analysis to decipher cryptic diversification in reptiles: Insights from the Spiny‐footed Lizard (Reptilia, Lacertidae). Zoologica Scripta, 53 (1) : 1-15.

Résumé : Uncertainties on species taxonomy and distribution are major factors hampering efficient conservation planning in the current context of biodiversity erosion, even concerning widespread and abundant species in relatively well-studied regions. Species delimitation have long been based on phylogenetic analyses of a small number of standard markers, but accurate lineage identification through this approach can be hampered by incomplete lineage sorting, introgression or isolation by distance. In that context, analyses of introgression patterns at secondary contact zones offer an interesting alternative by allowing a direct estimation of reproductive isolation, especially when using genome-wide markers. Here, we investigated a contact zone between two genetic groups of the Spiny-footed Lizard Acanthodactylus erythrurus (Schinz, 1833) in Morocco, whose status as separate lineages remained disputed in previous multilocus studies. Based on thousands of genome-wide markers obtained through a RADseq approach, we confirmed that they represent distinct evolutionary lineages. Furthermore, the transition at their contact zone was very steep, with spatially restricted gene flow, highlighting levels of reproductive isolation consistent with species-level lineages. Our study further illustrates the power of RADseq-based studies of contact zones to understand cryptic diversity in non-model organisms.

Mots-clés Agrovoc : marqueur génétique, biodiversité, biogéographie, variation génétique, Introgression, Lacertidae, Reptilia

Mots-clés géographiques Agrovoc : Maroc

Mots-clés complémentaires : Acanthodactylus erythrurus

Mots-clés libres : Acanthodactylus erythrurus, Admixture, Cryptic speciation, Hybrid zone

Classification Agris : L10 - Génétique et amélioration des animaux
L20 - Écologie animale
L60 - Taxonomie et géographie animales

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Agences de financement hors UE : Agence Nationale de la Recherche, Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement

Projets sur financement : (FRA) Influence de l'installation des hommes modernes au Maroc sur l'évolution de la biodiversité des petits vertébrés terrestres, (FRA) Mediterranean Center for Environment and Biodiversity, (FRA) Nouveaux outils statistiques pour l'analyse spatiale des données génétiques, (FRA) Impact génomique et causes évolutives de l'introgression aux stades avancés de la spéciation

Auteurs et affiliations

• Doniol-Valcroze Paul, CNRS (FRA) - auteur correspondant
• Rancilhac Loîs, Technische Universität Braunschweig (DEU)
• Brito José-Carlos, CIBIO (PRT)
• Miralles Aurélien, CNRS (FRA)
• Geniez Philippe, CNRS (FRA)
• Benoit Laure, CIRAD-BIOS-UMR CBGP (FRA)
• Loiseau Anne, INRAE (FRA)
• Leblois Raphaël, INRAE (FRA)
• Dufresnes Christophe, Nanjing Forestry University (CHN)
• Crochet Pierre-André, CNRS (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/607681/)

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