Laserfiche WebLink
Sr'g1L.L MAPqV9LI.S <br /> Small nwmals were sampled during October, 1979 by 106m 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 in' ilCes (number of individuals captured per 100 trap nights) , sex <br /> and age ola8g ratios, and Shannon-Weiner species diversity indices are pro- <br /> vided on the print-outs. Relative abundance indices for each species and <br /> Shannon WCine-r diversity indices are summarized for each vegetation type in <br /> Table 2. yjacrohabitat affinities as denoted by Chi-square values are provided <br /> for each species captured in Appendix B, Part 1. <br /> T o major topics are considered in the following discussion of small mammal <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 mxmel 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 nz mals in ttie Nucla study area. Of the four species capturer during <br /> small mammal investigations, western harvest mouse (ReifihrodontomyS megalotis) , <br /> deer mouse (percmyscus maniculatus) , meadow vole 04icrotus perL- ylvanicus) , <br /> and house iwtlse (Mus musculus) , all four were represents in samples <br /> collected in the riP Tian type. Accordingly, thet 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 nanTnals (8.8 individuals/ <br /> 100 trap nights) . The meadow vole was the most abundant species and accounted <br /> for over 43% of the small manuals captured. The house Crouse (2.5 individuals/ <br /> 100 trap nights) , western harvest muse (1.3 individuals/100 trap nights) , <br /> and deer mouse (1.3 individua1s/100 trap nights) followed in abundance. All <br /> species captured in riparian, except the deer muse, s"­.nwed. an affinity for <br /> -27- <br /> J U N 1 i /s8O <br />