Vegetation community structure At each study site, vegetation type and percent cover were determined. In this process, a 0.5 m x 2.0 m sampling frame was placed on the ground at 4 random locations within each small mammal trapping grid, and the percent cover of forbs, grass, shrubs, litter, bare soil and rock was estimated for that study site. Total cover represented a compilation of cover values for forbs, grass, shrubs, and litter within a single sampling frame. After estimation of percent cover, all vegetation within the sampling frame was clipped at ground level and sorted into functional groups (forbs, grass, shrubs, and litter) which were identified using a field guide (Komarek, 1994). Within 24 hrs of being clipped, collected vegetation was weighed and then placed in a drying oven at 65C for 48 h and weighed again. To determine plant moisture content, the final weights of the dry vegetation samples were subtracted from the initial weights. Plant moisture content from the 4 sample plots was averaged to determine vegetation moisture content for each study site (Lehmer et al., 2006).

Data analyses Differences in SNV prevalence, deer mouse density, and small mammal diversity among study sites were determined with analysis of variance (ANOVA). ANOVA was also used to determine differences in soil pH, soil water content, vegetation cover, and plant moisture content across study sites. Relationships between SNV prevalence and deer mouse density, soil pH, soil water content, and plant moisture content were evaluated with Pearson correlations. All differences were considered to be statistically significant if P < 0.05."

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