hybridization; multilocus barcoding; phylogeography; reptiles; taxonomy; Ecology, Evolution, Behavior and Systematics; Animal Science and Zoology
Abstract :
[en] With five currently recognized species that form several secondary contact zones, slow worms (Anguidae: Anguis) offer a valuable model to study the fate of evolutionary lineages in the face of hybridization and genetic introgression. The relationships between the Western Slow Worm Anguis fragilis and the Italian Slow Worm Anguis veronensis are particularly puzzling. Their respective distributions remain poorly known on the edges of their parapatric ranges, as both species lack external differentiation. Contra earlier mitochondrial phylogenies, new phylogenomic inferences have shown that A. fragilis and A. veronensis are sister taxa, thus casting doubts on their specific status. In this study, we analyze the A. fragilis/veronensis transition in southeastern France, based on one mitochondrial (ND2) and two nuclear (PRLR and HA1) genetic markers in 81 specimens from 61 localities. The ranges of A. fragilis and A. veronensis roughly extends northwest and southeast of the Rhône-Durance valleys, respectively, with clear signs of introgressive hybridization in the areas of contact (notably the eastern parts of the lower Rhône valley). Based on the three molecular markers analyzed, gene flow does not seem to reach outside the narrow hybrid zone, which likely indicates (incomplete) intrinsic reproductive isolation. Hence, we provisionally suggest maintaining A. veronensis as a separate species from A. fragilis. More generally, patterns of genetic divergence, external differentiation, and hybridization (both historical and contemporary) in Anguis ssp. supports a speciation continuum spanning from cryptic, genetically compatible alloparapatric lineages to phenotypically distinct, deeply diverged and fully reproductively isolated taxa able to coexist in sympatry.
Dufresnes, Christophe ; Laboratory for Amphibian Systematic & Evolutionary Research, College of Biology & the Environment, Nanjing Forestry University, Nanjing, China
Sourrouille, Patricia; CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France
Olivier, Anthony; Tour du Valat, Research Institute for the Conservation of Mediterranean Wetlands, Arles, France
Ballouard, Jean-Marie; CRCC, Centre for Research and Conservation of Chelonians, SOPTOM, Var, Carnoules, France
Leccia, Marie-France; Parc National du Mercantour, Nice, France
Tiné, Rémi; Syndicat Mixte Camargue Gardoise, Centre du Scamandre, Route des Iscles, Gallician, Vauvert, France
Cheylan, Marc; Biogéographie et Ecologie des Vertébrés, CEFE, EPHE-PSL University, Univ. Montpellier, CNRS, IRD, Montpellier, France
Le Henanff, Maxime; ECO-MED - Ecologie & Médiation, Résidence Atrium, Montpellier, France
Nicolas, Jean; Camplong, France
Caron, Sébastien; CRCC, Centre for Research and Conservation of Chelonians, SOPTOM, Var, Carnoules, France
Massez, Grégoire; Les Amis des Marais du Vigueirat, Les Marais du Vigueirat, France
Levasseur, Romain; CRCC, Centre for Research and Conservation of Chelonians, SOPTOM, Var, Carnoules, France ; Le Val, France
Pille, Fabien ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS) ; CRCC, Centre for Research and Conservation of Chelonians, SOPTOM, Var, Carnoules, France
Peyre, Olivier; PANDORA, Avignon Cédex 9, France
Thibault, Marc; Tour du Valat, Research Institute for the Conservation of Mediterranean Wetlands, Arles, France
Crottini, Angelica; CIBIO/InBio, Centro de Investigação em Biodiversidade e Recursos Genéticos Campus Agrário de Vairão, Vairão, Portugal ; Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Porto, Portugal ; BIOPOLIS Program in Genomics, Biodiversity and Land Planning, CIBIO, Vairão, Portugal
Fuento, Nicolas; LPO PACA, Hyères, France
Crochet, Pierre-André; CEFE, CNRS, Univ. Montpellier, EPHE, IRD, Montpellier, France
Exploring the speciation continuum of slow worms: location and extent of the Anguis fragilis/veronensis hybrid zone in southeastern France
Publication date :
2023
Journal title :
Amphibia-Reptilia
ISSN :
0173-5373
eISSN :
1568-5381
Publisher :
Brill Academic Publishers
Peer reviewed :
Peer Reviewed verified by ORBi
Funding text :
We are grateful to F. Arnaboldi, D. Arsovski, J.-M. Ballouard / SOPTOM, H. Brosius, F. Chapelur, S. Combeaud, P. Coursier-Fournial, V. Danias, B. Delahaie, F. Dhermain, E. Didner, J. Dublon, G. Gillet, C. Jakob / Ecole domaine du possible, T. Lebard, I. Lhommedet, A. Lucas, J.-L. Lucchesi, A. Lyet, L. Malthieux, P. Migaud, A. Miralles, P. Ormea, B. Schatz, T. Schwartz, A. Rocha, L. Tillion, F. Veyrunes, M. Voronkoff, A. Westerström, L. Westrin and L. Zimmerman for their help with samples collection and to P. Geniez for his help with the samples curation. CD was supported by the Research Found for International Scientists (RFIS) of the National Science Foundation of China (NSFC) (N°3211101356), as well as the Taxon-Omics Priority Programme (SPP1991) of the Deutsche Forschungsgemeinschaft (DFG) (grant number VE247/19-1). AC was supported by the Portuguese National Funds through FCT– Fundação para a Ciência e a Tecnologia (research contract 2020.00823.CEECIND).
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