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<br />which t'~e n,~cYiw wle was encountered. It was U.e Trost auwxi:~i~t species <br />captured in riparian (3.8 individuals/100 trap nights) and seoord most <br />abundant species over all habitat types (0.3 individuals/100 trap nights}, <br />The sex ratio of meadow roles was 0.33 males and 0.67 fsriales. <br />The house mouse was captured only in the riparian habitat, House mice <br />oormonly inhabit houses and outbuildings] }~,,~ver, they also inhabit grain <br />fields and fence rgws (Lechlei tner 1969). In colder months, the house <br />mouse may migrate into ch,~ellings. A refuse dvnp, located adjacent to the <br />riparian habitat type probably supports a large population of house mice. <br />Tne total relative abundance o£ the house house over all habitat types was <br />0.4 individuals/100 trap nights and the sex ratio was 0.50 males and 0.50 <br />£miales. The house mouse by virtue that all observations occurred in riparian <br />habitat, showed an affinity for this type. <br />Western harvest mice are frost often found in dense grassy or weedy areas, and <br />often in riparian situations (Lechleitner 1969). Food sources of this <br />~~ ~ ~ m3orotine include seeds, green portions. of plants and insects. Only one <br />western harvest mouse was captured in the study area. :nis individual (male) <br />was captured in the riparian habitat type. The total relative alxmdance <br />of this species over all types was 0.2 individuals/100 trap nights. <br />Other *~am~als. Small and medium-sized m3rtmal species mt captured in live <br />traps but whose presence on the Dlucla mine site has been substantiated during <br />other field activities indude the following species: aesert cottontail <br />(Syivilaws audubonii), muskrat (Ondatra zibethicus), and GUnnison's prairie <br />dog (~~ gunnisoni). <br />'^he desert cottontail appears to be very oormion in the study area. Five cotton- <br />tails ~.exe observed during the 1979-1980 Field season. Tne habitat of the <br />desert cottontail includes a vaziety of ecoloGical situations (e.g., desert, <br />grassland, shrubland, and riparian). Cottontails were observed on the study <br />area in the upland sagebrush, riparian and grassland pasture habitat types. <br />~~ One rn~skrat was obsen~eci in the riparian type dvrinn Tpri1, 1979. Muskrats <br />are aquatic mammals, living in strezvns, lakes, ponds and ct~n~s (2ednleitner <br />-30- <br /> <br />JUN 3 1 1980 <br />(Revised August 2006) Attachment 2.04.10-10-37 <br />