Abstract
Mountain-associated species, which exhibit allopatric distributions associated with elevation, endemisms and complex evolutionary histories, pose challenging evolutionary scenarios in which to discern the diversification of species. The Peromyscus mexicanus mice group, distributed along mountains in southern Mexico and Central America, is morphometrically variable, a key rationale for the ongoing controversy regarding its species delimitation. Based on the recognized 15 mitochondrial lineages for the group, we analysed external and craniodental morphometric variables to test whether lineages can be differentiated morphometrically and allow for the delimitation of species. We also aimed to test the prediction that the phylogenetic structure of the morphometric data is concordant with that of the molecular information. Based on 19 craniodental measurements from 521 specimens, multivariate and discriminant analyses showed that lineages are morphometrically discernible, representing distinct phenotypes, and that overall size and mandible measurements are significant features that discriminate lineages, supporting hypotheses about differences in feeding habits between species. Also, a pattern of increasing size with elevation was observed, further supported by specific morphological differences exhibited between highland and lowland lineages inhabiting the same mountain. Our results demonstrate that P. mexicanus is both genetically and morphometrically variable, where most highland montane species are differentiated from lowland species; also, a significant correlation between mitochondrial and morphometric information is indicative of phenetic concordance, altogether in agreement with a recent taxonomic proposal for the group. We suggest that the group's intricate diversification responds to ecological diversification and adaptation to a variety of mountain habitats and Pleistocene biogeographic climatic dynamics.
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