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sVALL NfAIVOLIS <br />small mammals were sampled during October, 1979 by 100`m live -- trapping <br />transects at the Nucla :Line 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 small marrrrkal <br />trapping results. First, the relative importance of each habitat type to <br />small mammal . populations in the study area is discussed. Importance is <br />defined by three parame.:.ers: species diversity, species composition, and <br />total small mammal 'abundance. Secondly, the distribution, abundance and popu- <br />lation structure (sex ratios) are described for each species captured. <br />Small mammal habitats. The riparian habitat provides the best habitat for <br />small mammals in the Nucla study area. Of the four species captured Fuzing <br />small mammal investigations, western harvest mouse (Pei - hrodontomys s alotis) , <br />deer rouse (Percznyscus rraniculatus) , meadow vole p4icrotus pennsylvanicus) , <br />and house mouse (Mus 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 mouse (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 mouse, showed an affinity for <br />-27- <br />JUN SS DSO <br />