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Abstract Phyletic, biogeographic, and ecologic relationships among relictual montane populations of least chipmunks (Eutamias minimus) from Arizona, Colorado, and New Mexico were examined by analysis of pelage color, cranial and bacular morphology, protein electrophoresis, and habitat characteristics. Unlike previous investigations of geographic variation involving these populations, a pattern of relationship and differentiation corresponding to contemporary geographic discontinuities in the Southwest is demonstrated. Populations along the east and west sides of the Rio Grande Valley constitute distinct evolutionary lineages, with the most geographically isolated populations exhibiting the greatest amount of genetic divergence. This pattern of differentiation is consistent with the hypothesis that montane corridors present during the Pleistocene facilitated colonization by ancestral northern stocks in accordance with vicariant biogeographic theory. Microhabitat assessments demonstrate that least chipmunks inhabit a diverse spectrum of environmental regimes ranging in elevation from 2,400 to 3,900 m, and encompassing several habitat types. These results are consistent with observations on other populations of this species, yet contradict the hypothesis that least chipmunks in the Southwest have such restrictive ecologic requirements as to be predisposed to rapid extinction during interglacial episodes of the Pleistocene. The significance of this study to the most recent vicariant explanation of southwestern montane mammal biogeography is discussed. Publisher Information Building on two centuries' experience, Taylor & Francis has grown rapidlyover the last two decades to become a leading international academic publisher.The Group publishes over 800 journals and over 1,800 new books each year, coveringa wide variety of subject areas and incorporating the journal imprints of Routledge,Carfax, Spon Press, Psychology Press, Martin Dunitz, and Taylor & Francis.Taylor & Francis is fully committed to the publication and dissemination of scholarly information of the highest quality, and today this remains the primary goal. Rights & Usage This item is part of a JSTOR
Collection. Which of the following is least likely to change the gene for the population of chipmunks?1 Answer. A number of chipmunks die due to old age is least likely to change the gene pool of a population of chipmunk.
Which environmental factor would likely lead to an increase in genetic variation in a population of squirrels quizlet?Genetic variation will increase because of a new habitat and food source. A scientist has been tracking and studying a population of deer in Yellowstone National Park. He surveys the population every six months. Usually, the population is thriving and has a gene pool with a wide variety of traits.
Which of the following defines a gene pool?A gene pool refers to the combination of all the genes (including alleles) present in a reproducing population or species.
Which is the most likely explanation for the change the beetle population?In a few generations, this population of beetles changed. Which is the most likely explanation for the change? The beetle population moved to a greener habitat.
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Which if the following is least likely to change the gene pool of a population of chipmunks?
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