title: Phylogenetic relationships and biogeography of the genus Chondrostoma inferred from mitochondrial DNA sequences.
abstract: A phylogeny of the species of the nase genus Chondrostoma was constructed from a complete mitochondrial cytochrome b gene (1140 bp). Molecular phylogeny was used to revise the current systematics of this group, and to infer a biogeographical model of the Mediterranean area during the Cenozoic period. We confirmed the monophyly of the genus Chondrostoma, and defined seven different lineages within it: Polylepis, Arcasii, Lemmingii, Toxostoma, Nasus, C. genei, and C. soetta. The separation of main lineages within Chondrostoma occurred in the Middle-Upper Miocene, approximately 11 million years ago, while the greatest species radiation took place in the Pliocene close to the time the current drainages system were created. It is unlikely that this genus experienced an extensive dispersal during the Messinian, in the Lago-Mare Phase. Given the level of current knowledge, a biogeographical model constructed on the basis of vicariant events seems more realistic than does a dispersalist model.
authors.affiliation: Department of Biodiversity and Evolutionary Biology, Museo Nacional de Ciencias Naturales, CSIC, José Gutiérrez Abascal 2, 28006 Madrid, Spain. mcnd147@mncn.csic.es
authors.forename: Ignacio
authors.initials: I
authors.lastname: Doadrio
authors.forename: José A
authors.initials: JA
authors.lastname: Carmona
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003531:Cypriniformes / Q000235:genetics*; D045303:Cytochromes b / Q000235:genetics; D004272:DNA, Mitochondrial; D019143:Evolution, Molecular; D005843:Geography; D016013:Likelihood Functions; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D013045:Species Specificity; D013997:Time Factors
chemical_list: D004272:DNA, Mitochondrial; D045303:Cytochromes b