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• Small Mammals. Small man[nals were sampled during late Septembas, 1979 by <br />100m live trapping transacts at the Seneca II mine study area. Congutes <br />printouts of the field and analyzed data are provided in Appendix B, Part 1 <br />for each of the four vegetation types sampled (i.e., mixed brush, aspen, <br />upland sagebrush, and riparian). Numbers of individuals of each species <br />captured, relative abtndarx,,e indices (number of individuals captured per <br />100 trap nights), sex and age class ratios, and Shannon~einer species <br />diversity indices are provided on the print-outs. Relative abundance <br />indices for each species and Shannon-Weiner diversity irxiioes are sLmmarized <br />for each vegetation type in Table 4. Macrohabitat affinities as denoted <br />by Chi-Square values are provided for each species captured in Appendix B, <br />Part 1. <br />Two major topics are considered in the following discussion of small maimril <br />trapping results. First, the relative i~ortanoe of each habitat type to <br />sn-all mammal populations in the study area is discussed. I~ortance is <br />defined by three parameters: species diversity, species composition, and <br />• total small m3nn~a1 abundance. Secondly, the distribution, abundance and <br />population structure (sex ratios) are described for each species captured. <br />Small Mammal Habitats. Only three species were captured on transacts: <br />least chipmunk (Eutamias miniimis), deer mouse (Peromyscus maniculatus) <br />and long-tailed wle (Micmtus longicaudus). The latter species was <br />captissi only in aspen while the deer arouse and least chipmunk were <br />represented in all types sampled except riparian. No small mammals were <br />captured in riparian vegetation. As a result of the low numbers of species <br />encountered, species diversity indices were low for all types sampled. <br />Although only two species of deer mouse and least chipmunk were represented <br />in samples fran the mixed brush type, this type exhibited the highest <br />species diversity of all vegetation types sampled (0.59) due to a more <br />equitable distribution of individuals amang species. However, the mixed <br />brush evidenced the lowest relative abundance (9.2 individuals/100 trap <br />nights) of all types sampled except riparian. The deer mouse was the nest <br />abundant species captured with a relative abundance index of 6.7 individuals/ <br />100 trap nights, while the least chipmtnk evidenced 2.5 individuals/100 trap <br />-29- <br />