DISPERSAL OF VIVIPARITY ACROSS CONTACT ZONES IN IBERIAN POPULATIONS OF FIRE SALAMANDERS (SALAMANDRA) INFERRED FROM DISCORDANCE OF GENETIC AND MORPHOLOGICAL TRAITS
Open Access
- 1 January 2003
- Vol. 57 (1) , 129-143
- https://doi.org/10.1111/j.0014-3820.2003.tb00221.x
Abstract
We used partial sequences of the cytochrome b mitochondrial DNA (mtDNA) gene, obtained from 76 individuals representing 45 populations of Iberian Salamandra salamandra plus 15 sequences of additional species of Salamandra and related genera, to investigate contact zones. These zones, identified by earlier allozymic and morphological analyses, are between populations of viviparous (S. s. bernardezi and S. s. fastuosa) and ovoviviparous (S. s. gallaica and S. s. terrestris) salamanders. The distribution of mtDNA and nuclear markers is mostly concordant at one contact zone (between S. s. gallaica and S. s. bernardezi), but at another (between S. s. fastuosa and S. s. terrestris) the markers are offset by about 250 km. The observed geographic variation fits a model of mtDNA capture. Among the potential mechanisms responsible for such discordance we favor a combination of range shifts due to climatic fluctuations and biased genetic admixture across moving contact zones. We apply our findings to the issue of possible homoplasy in the evolution of viviparity and conclude that viviparity likely arose only once within S. salamandra.Keywords
This publication has 51 references indexed in Scilit:
- Nested clade analysis and the genetic evidence for population expansion in the phylogeography of the golden-striped salamander, Chioglossa lusitanica (Amphibia: Urodela)Heredity, 2002
- Molecular Systematics of the Eastern Fence Lizard (Sceloporus undulatus): A Comparison of Parsimony, Likelihood, and Bayesian ApproachesSystematic Biology, 2002
- Molecular Phylogenetic Analysis of Slender Salamanders, Genus Batrachoseps (Amphibia: Plethodontidae), from Central Coastal California with Descriptions of Four New SpeciesHerpetological Monographs, 2001
- Multiple Comparisons of Log-Likelihoods with Applications to Phylogenetic InferenceMolecular Biology and Evolution, 1999
- Influence of the Guadalquivir River Basin on Mitochondrial DNA Evolution of Salamandra salamandra (Caudata: Salamandridae) from Southern SpainIchthyology & Herpetology, 1998
- Patterns of Growth and Movements in a Population of Ensatina eschscholtzii platensis (Caudata: Plethodontidae) in the Sierra Nevada, CaliforniaJournal of Herpetology, 1995
- Hybrid Pocket Gophers and Some Thoughts on the Relationship of Natural Hybrids to the Rules of Nomenclature and the Endangered Species ActJournal of Mammalogy, 1995
- Molecular Changes At SpeciationAnnual Review of Ecology and Systematics, 1991
- A simple method for estimating evolutionary rates of base substitutions through comparative studies of nucleotide sequencesJournal of Molecular Evolution, 1980
- Evolutionary Relationships in the Family SalamandridaeIchthyology & Herpetology, 1969