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'AL , MAKAAIS <br />Small mammals were sanmled during October, 1979 by l00 m live•- tra <br />transects at the Nucla study area Computer print -outs of the . <br />field and analyzed data are provided in Appendix B, Part 1 for each of the <br />three vegetation types sampled: upland sagebrush, grassland pasture, <br />and riparian. Numbers of individuals of each species captured, relative <br />abundance indices (number of individuals captured per 100 trap nights), sex <br />and age class ratios, and Shannon Weiner species diversity indices are pro- <br />vided on the print -outs. Relative abundance indices for each species and <br />Shannon- Weiner diversity indices are summarized for each vegetation type in <br />Table 2. Macrohabitat affinities as denoted by Chi-square values are provided <br />for each species captured in Appendix B, Part 1. <br />Two major topics are considered in the following discussion of sell mamma]. <br />trapping results. First, the relative importance of each habitat type to <br />small mil populations in the study area is discussed. Importance is <br />defined by three parama':•ers: species diversity, species composition, and <br />total small manzal abundance. Secondly, the distribution, abundance and popu- <br />lation structure (sex ratios) are described for each species captured. <br />Shall manmal habitats. The riparian habitat provides the best habitat for <br />small mammals in the Nucla study area. Of the four species captured wring <br />small mammal investigations, western harvest mouse (neilhrodontomys megalotis) , <br />deer rouse OPeromyscus iraniculatus) , meadow vole C1icrotuus pennsylvanicus) , <br />and house rouse Onus musculus), all four were represented in samples <br />collected in the riparian type. Accordingly, the Shannon - Weiner species <br />diversity index for riparian was the highest recorded at 1.28. Riparian vege- <br />tation also evidenced the largest population of small mammals (8.8 individuals,/ <br />100 trap nights). The meadow vole was the most abundant species and accounted <br />for over 43% of the small mammals captured. The house mouse (2.5 individuals/ <br />100 trap nights) , western harvest rouse (1.3 •individuals /100 trap nights) , <br />and deer mouse (1.3 individuals /100 trap nights) followed in abundance. All <br />species captured in riparian, except the deer rouse, showed an af`inity for <br />_27_ <br />J U N 1 1 tg8O <br />