Graduate Thesis Or Dissertation
 

Occurrence and relative abundance of small mammals associated with riparian and upland habitats along the Columbia River

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  • A small mammal inventory of occurrence and relative abundance was conducted in riparian and upland habitats in six segments along the lower Columbia River from the river mouth to McNary Dam (river mile 292) during 1974 and 1975 by removal trapping on standardized trap lines. Analysis of variance was used to compare capture per 100 trap-night indices of abundance of a species or group of species among habitats within a segment and among segments of the study area. Of the 59 species of small mammals purported to occur near the Columbia River, 39 were encountered. Many of the species not encountered. occur at elevations higher than the study area or are rare. Although 23 species were captured in standardized traps, the deer mouse (Peromyscus maniculatus) and vagrant shrew (Sorex vagrans) comprised 84.9 percent of the total catch. The deer mouse, the most abundant species, occurred in all 38 habitats except Russian olive (Elaeagnus angustifolia) and increased in abundance from west to east. Insectivores, mainly vagrant shrews, were most abundant in the west and decreased in abundance along the decreasing moisture gradient from west to east as did voles (Microtus spp.).
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Déclaration de droits
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