Geographic distribution and phenetic skull variation in two close species of Graomys (Rodentia, Cricetidae, Sigmodontinae)

摘要: Abstract The interspecific differentiation of South American rodents the genus Graomys was assayed at ecological and morphometric levels in two species. At level, niche modelling used. hypothesis that size shape skull vary with geographic location tested using geometric morphometrics by assessing extent spatial distribution phenotypic variation within among species, griseoflavus chacoensis. Our results indicate between G. chacoensis inhabiting preferably Chaco ecoregion mainly Monte ecoregion. In multiple linear regressions, approximately 20% is explained latitude, altitude, temperature seasonality. partial least square analysis reveals strong correlation environmental variables, annual mean temperature, precipitation. Discrimination highly reliable when tools. These permit us to elucidate some evolutionary processes have occurred these