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    Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado
    Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado
    Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado
    Ebook57 pages35 minutes

    Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado

    By Sydney Anderson

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    LanguageEnglish
    PublisherArchive Classics
    Release dateNov 26, 2013
    Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado
    Author

    Sydney Anderson

    Sydney Golden Anderson is a maker, grower, and friend of pollinators. She earned a BS in ecology from UNC Asheville and an MA in community-based education from the School of the Art Institute of Chicago. She is the senior community habitat coordinator for the National Wildlife Federation and lives in the foothills of Colorado. Follow Anderson at @tiger.swallowtail.

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      Book preview

      Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado - Sydney Anderson

      The Project Gutenberg EBook of Subspeciation in the Meadow Mouse, Microtus

      montanus, in Wyoming and Colorado, by Sydney Anderson

      This eBook is for the use of anyone anywhere at no cost and with

      almost no restrictions whatsoever. You may copy it, give it away or

      re-use it under the terms of the Project Gutenberg License included

      with this eBook or online at www.gutenberg.org

      Title: Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado

      Author: Sydney Anderson

      Release Date: March 22, 2010 [EBook #31730]

      Language: English

      *** START OF THIS PROJECT GUTENBERG EBOOK MEADOW MOUSE ***

      Produced by Chris Curnow, Simon Gardner, Joseph Cooper and

      the Online Distributed Proofreading Team at

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      University of Kansas Publications

      Museum of Natural History

      Volume 7, No. 7, pp. 489-506, 2 figures in text

      July 23, 1954

      Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado

      BY

      SYDNEY ANDERSON

      University of Kansas

      Lawrence

      1954

      University of Kansas Publications, Museum of Natural History

      Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Robert W. Wilson

      Volume 7, No. 7, pp. 489-506, 2 figures in text

      Published July 23, 1954

      University of Kansas

      Lawrence, Kansas

      PRINTED BY

      FERD VOILAND, JR., STATE PRINTER

      TOPEKA, KANSAS

      1954

      25-3560

      Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado

      BY

      SYDNEY ANDERSON

      Microtus montanus reaches the eastern limits of its geographic distribution in Wyoming and Colorado. There the mountains, but in general not the lowlands, are occupied by this species. A certain minimum of moisture may be of direct importance to the mouse and certainly is indirectly important, because certain hydrophytic or mesophytic grasses used by the mouse for food, for protection from enemies, and for shelter from the elements are dependent on the moisture. Areas suitable for Microtus montanus are separated by deserts that are dominated by sagebrush and other xerophytic plants or by forests or rocky exposures at higher altitudes. A relatively small percentage, probably less than ten per cent, of the total area even in the more favorable parts of the range of the species is suitable for occupancy. In these mice, as in other microtines (Elton, 1942; Piper, 1909), there are seasonal, and irregularly multiannual fluctuations in population density, which sometimes are extreme. Consequently the mice at some times seem to be absent from suitable habitats, and at some other times occur there in amazingly large numbers.

      Because the species is broken up into partly isolated, or at times completely isolated, colonies or local populations it may be supposed that various evolutionary forces such as selection and random genetic drift operate to foster variation. The degree to which racial distinction is attained may depend upon these forces and the time available. In Microtus montanus in the eastern Rocky Mountains the degree of subspecific distinction is not great.

      The study here reported upon is based on 1,187 specimens of Microtus montanus from Wyoming, Colorado, Idaho and Montana, and on work in the field. I spent approximately four months

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