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Accueil du site → Master → Etats Unis → 1995 → Mitochondrial DNA variation in populations of Peromyscus eremicus from the Sonoran and Chihuahuan Deserts

Texas A&M University (1995)

Mitochondrial DNA variation in populations of Peromyscus eremicus from the Sonoran and Chihuahuan Deserts

Walpole, Deric King

Titre : Mitochondrial DNA variation in populations of Peromyscus eremicus from the Sonoran and Chihuahuan Deserts

Auteur : Walpole, Deric King

Université de soutenance : Texas A&M University

Grade : Master of Science (MS) 1995

Résumé
Morphologic and allozymic analyses provide evidence to suggest a lack of continuity between cactus mice (Peromyscus eremicus) from the Chihuahuan and Sonoran Deserts. In this study, cactus mice from 9 localities (6 from the Chihuahuan Desert and 3 from the Sonoran Desert) were analyzed for variation in restriction-fragment-length polymorphisms of a portion of the mitochondrial DNA (mtDNA) known to be useful for discriminating among species of Peromyscus (Hogan et al., 1993). Digestions using 5 restriction enzymes resulted in the recognition of 5 mtDNA haplotypes. The distribution of haplotypes and nucleotide diversity indicate that P. eremicus from the Chihuahuan and Sonoran Deserts constitute distinct sets of populations. The pattern of mtDNA divergence suggests a lack of gene flow between the two races and supports the hypothesis that these groups represent distinct species. Pliocene or late Pleistocene pluvial-interpluvial climatic fluctuations are implicated as the primary isolating mechanism between the cactus mice from the Sonoran and Chihuahuan Deserts.

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