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• lush and diverse vegetation found in bottomland was probably more <br />capable of supporting a variety of species than the other habitats at <br />Yoast. Because food was evidently quite abundant in bottomland, it is <br />likely that small mammals were not particularly attracted to the trap <br />bait. <br />The masked shrew was the most abundant species caught in bottom- <br />land (Table 12). Shrews are attracted to the moist conditions found <br />in bottomlands. The jumping mouse was the second most abundant small <br />mammal in bottomland. All of. the jumping mice were caught along the <br />south trapping line which ran through a large meadow bottom. Other <br />species found in bottomland included montane and long-tailed voles, <br />least chipmunks, and deer mice. <br />• Aspen <br />Small mammal species richness in aspen nearly matched that of <br />bottomland, and abundance in aspen was second only to rock outcrop. <br />Five species were trapped in aspen; the capture rate was 31.3 animals <br />per 100 trap nights. Habitat complexity was relatively high in aspen, <br />with trees, fallen logs, and shrub/forb understory. The deer mouse <br />was, by far, the most abundant small mammal in aspen. Other common <br />species caught in aspen included montane voles, least chipmunks, and <br />masked shrews. As noted above, the northern pocket gopher captured in <br />aspen was the only gopher caught at Yoast. This species does not <br />commonly enter traps. <br />Mountain Brush <br />Mountain brush is a relatively diverse and complex habitat. <br />• Small mammal trapping in mountain brush habitat yielded five species; <br />45 <br />