title: Phylogeography of the bark beetle Dendroctonus mexicanus Hopkins (Coleoptera: Curculionidae: Scolytinae).
abstract: Dendroctonus mexicanus is polyphagous within the Pinus genus and has a wide geographical distribution in Mexico and Guatemala. We examined the pattern of genetic variation across the range of this species to explore its demographic history and its phylogeographic pattern. Analysis of the mtDNA sequences of 173 individuals from 25 Mexican populations allowed to us identify 53 geographically structured haplotypes. High haplotype and low nucleotide diversities and Tajima's D indicate that D. mexicanus experienced rapid population expansion during its dispersal across mountain systems within its current range. The nested clade phylogeographic analysis indicates that the phylogeographic pattern of D. mexicanus is explained by continuous dispersion among lineages from the Sierra Madre Occidental, the Sierra Madre Oriental and the Trans-Mexican Volcanic Belt. However, we also observed isolation events among haplotypes from the Cofre de Perote/Trans-Mexican Volcanic Belt/Sierra Madre Oriental and the Trans-Mexican Volcanic Belt/Sierra Madre del Sur, which is consistent with the present conformation of mountain systems in Mexico and the emergence of geographical barriers during the Pleistocene.
authors.affiliation: Lab. de Variación Biológica y Evolución, Escuela Nacional de Ciencias Biológicas-IPN, Prol. de Carpio y Plan de Ayala s/n, Col. Santo Tomas, C.P. 11340 México, DF, Mexico.
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Anducho-Reyes
authors.forename: Anthony I
authors.initials: AI
authors.lastname: Cognato
authors.forename: Jane L
authors.initials: JL
authors.lastname: Hayes
authors.forename: Gerardo
authors.initials: G
authors.lastname: Zúñiga
mesh_terms: D000818:Animals; D001499:Bayes Theorem; D001517:Coleoptera / Q000145:classification / Q000235:genetics*; D004272:DNA, Mitochondrial / Q000235:genetics; D003576:Electron Transport Complex IV / Q000235:genetics; D019143:Evolution, Molecular; D017344:Genes, Insect; D050259:Genes, Mitochondrial; D014644:Genetic Variation; D005828:Genetics, Population; D049750:Genome, Insect; D005843:Geography; D006166:Guatemala; D006239:Haplotypes; D008800:Mexico; D008928:Mitochondria / Q000235:genetics; D008957:Models, Genetic; D010802:Phylogeny; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D004272:DNA, Mitochondrial; D003576:Electron Transport Complex IV