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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 Character set encoding: ASCII *** START OF THIS PROJECT GUTENBERG EBOOK MEADOW MOUSE *** Produced by Chris Curnow, Simon Gardner, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net 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
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