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<br /> <br />• <br />the type as determined by Qti-square data (Appendix B, Part 1). <br />The deer rouse was the only species captured in the other tso vegetation <br />types saa~led, upland sagebrush and grassland pasture.. As a result, the species <br />diversity irrlex was 0.0 for bot;i types. Relative abundance indices was <br />also low for both types with 0.8 individuals/100 trap ru ghts for upland <br />sagebrush and 0.4 individuals/100 trap nights for grassland pasture. <br />As a resulC of the low rnsnber of captures, the deer :rouse did not reveal an <br />affinity for any type sampled. <br />Asaumi~ that trapping results reflect actual relative abundance of small <br />maamals in aach o£ the types sampled, it is evident that both upland sage- <br />brush and grassland pasture do not provide good small mammal habitat at <br />the Ivucla site. Predation, arrq~etition with (Unnison's prairie clogs (see <br />below) , lack ^f appropriate food and/or nesting rte,; rarents, and the ha<roger~e- <br />ity of the types (reduced number of small rnamnal niches) are all possible <br />reasons far the low populations levels observed on these t~,o types. Con- <br />versely, the riparian type provides habitat for te+o small pamcal species with <br />narrow habitat rern,irements, the westrsn harvest mouse and meadow wle. <br />Both are generally found in riparian :situations only (Leichleitner 1969). <br />Moreover, the riparian type, in the form of an increased vegetation coves, <br />results in both more species and a higher population level izi this habitat. . <br />9re11 8'amral Species. The deer noose was captured in all vegetation types <br />sampled in the study area. •,'his nocturnal species is probably the most <br />abundant and widespread mammal in Colorado (iechleitner 1969). The deer <br />mouse occurs in a variety of habitats, fz'o[n deserts bo marshes and £rom prai- <br />ries tp above timberlixue. A total of 4 deer mice were captured, representing <br />a total relative abundance over all'ty~yes of 0.7 individuals/100 trap nights. <br />The deeranuse did not show an affinity for a particular habitat type. 'The <br />sex ratio of all deer mice captured was 0.75 fgnales and 0.25 males. <br />L <br />Pti?adow wle habitat includes artist areas with abundant supplies of grasses, <br />sedges or other green, succulent vegetation. The only habitat with these <br />characteristics in the study area is riparian and was the only habitat in <br />-29- <br />I• <br />JUM 1 1 5980 <br />(Revised August 2006) <br />Attachment 2.04.10-10-36 <br />