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Habitat Orientation and Interspecific interaction of Microtus pennsylvanicus and Peromyscus leucopus

Leslie S. Bowker and Paul G. Pearson
The American Midland Naturalist
Vol. 94, No. 2 (Oct., 1975), pp. 491-496
DOI: 10.2307/2424444
Stable URL: http://www.jstor.org/stable/2424444
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Habitat Orientation and Interspecific interaction of Microtus pennsylvanicus and Peromyscus leucopus
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Abstract

Various population combinations of Microtus pennsylvanicus and Perorayscus leucopus were subcutaneously injected with a 1-cm gold (Au 198) wire and released in a 44 x 36 m enclosed field. Data were obtained by locating the gold-injected mice with a hand-held Geiger counter and by direct observation. M. pennsylvanicus had a strong habitat orientation for areas of dense vegetation while P. leucopus had an orientation for complex vegetational areas consisting of small dense clumps surrounded by expanses of sparse vegetation. The distribution of M. pcnnsylvanicus influenced the distribution of P. leucopus. Increasing the population of M. pennsyloanicus within the enclosure resulted in a population shift of P. leucopus to more sparsely vegetated areas and an increased P. leucopus escape rate.

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