title: Congruent signals of population history but radically different patterns of genetic diversity between mitochondrial and nuclear markers in a mountain lizard.
abstract: Historical factors, current population size, population connectivity and selective processes at linked loci contribute to shaping contemporary patterns of neutral genetic diversity. It is now widely acknowledged that nuclear and mitochondrial markers react differently to current demography as well as to past history, so the use of both types of markers is often advocated to gain insight on both historical and contemporary processes. We used 12 microsatellite loci genotyped in 13 populations of a mountain lizard (Iberolacerta bonnali) to test whether the historical scenario favoured by a previous mitochondrial study was also supported by nuclear markers and thereby evaluated the consequences of postglacial range movements on nuclear diversity. Congruent signals of recent history were revealed by nuclear and mitochondrial markers using an Approximate Bayesian computation approach, but contemporary patterns of mtDNA and nuclear DNA diversity were radically different. Although dispersal in this species is probably highly restricted at all spatial scales, colonization abilities have been historically good, suggesting capability for reestablishment of locally extinct populations except in fully disconnected habitats.
authors.affiliation: Department of Bioscience, Aarhus University, Ny Munkegade 114, DK-8000, Aarhus C, Denmark; EPHE-UMR5175 CEFE, Centre d'Écologie Fonctionnelle et Évolutive, 1919 route de Mende, 34293, Montpellier Cedex 5, France.
authors.forename: Anne-Laure
authors.initials: AL
authors.lastname: Ferchaud
authors.forename: Rémy
authors.initials: R
authors.lastname: Eudeline
authors.forename: Véronique
authors.initials: V
authors.lastname: Arnal
authors.forename: Marc
authors.initials: M
authors.lastname: Cheylan
authors.forename: Gilles
authors.initials: G
authors.lastname: Pottier
authors.forename: Raphaël
authors.initials: R
authors.lastname: Leblois
authors.forename: Pierre-André
authors.initials: PA
authors.lastname: Crochet
mesh_terms: D000818:Animals; D001499:Bayes Theorem; D002467:Cell Nucleus / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics*; D005602:France; D051456:Gene Flow; D005787:Gene Frequency; D014644:Genetic Variation; D005828:Genetics, Population; D005838:Genotype; D008116:Lizards / Q000235:genetics*; D018895:Microsatellite Repeats; D017422:Sequence Analysis, DNA
chemical_list: D004272:DNA, Mitochondrial
keywords: conservation biology; habitat degradation; life history evolution; phylogeography; reptiles