File:The Canadian field-naturalist (1967) (20333289069).jpg

Title: The Canadian field-naturalist
Identifier: canadianfieldnat1967otta (find matches)
Year: 1967 (1960s)
Authors: Ottawa Field-Naturalists' Club
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Publisher: Ottawa, Ottawa Field-Naturalists' Club
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

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1967 Sheppe: Habitat Restriction in Mice 83
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Figure 1. View of the barns and corrals, looking east, center of the photograph is the horse barn. The gabled building near the Several species of small mammals characteristic of higher altitudes were found in the ravine. The shrew mole, Neurotrichus gibbsi gibbsi (Baird), is a coastal species, and the Wright ranch is the only locality where it is known to occur east of the Cascade summit in British Columbia. One was trapped in the ravine in 1965 and another by the creek % mile farther west. The red-backed mouse, Clethrionomys gapperi saturatus (Rhoads) occurs throughout the region at higher elevations, but the ravine is the only place where it has been found in the immediate vicinity. The long-tailed vole, Microtus lo?igicaudus mordax (Merriam) also was common there. The ravine seems to be the easternmost locality of another mountain species, Feromyscus oreas Bangs. EarUer work had revealed a dense population of P. oreas on the floor of the ravine, overlapping slightly with the sparse population of P. inaniculatus artemisiae (Rhoads) on the surrounding hillsides. A few P. oreas also were found along the creek a short distance from the ravine. The absence of P. maniculatus from the floor of the ravine suggested that it was being excluded by P. oreas, and in 1957 the population of P. oreas was removed. In the following two years small numbers of P. mamculatiis but no P. oreas were found in the area formerly occupied exclusively by P. oreas. This seemed to confirm the hypothesis of competitive exclusion. In 1965 the Feromyscus populations had returned to their original condition. The floor of the ravine was occupied by a dense population of

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