Laserfiche WebLink
<br />the type as determined by C11i-square data (Apper~dix B, Part 1). <br />The deer mouse was the only species captured in the other two vegetation <br />types sampled, upland sagebrush and grassland pasture. As a result, the species <br />diversity index was O.0 for bot~ types. Relative abundance indices was <br />also low for both types with 0.8 individuals/100 trap nights for upland <br />sagebrush and 0.4 individuals/100 trap nights for grassland pasture. <br />As a result of the low number of captures, the deer mouse did not reveal an <br />affinity for any type sampled. <br />Assuming that trapping results reflect actual relative barn? of small <br />mammals i.'i eac)r of the types sartgled, it is evident that both uplard sage- <br />brush and grassland pasture do not provide good small mamual habitat at <br />the Nuc]a site. Predation, ~tition wit2: GUnnison's prairie dogs (see <br />below), lack ;£ appropriate food and/or nesting requirements and the homogene- <br />ity of the types (reduced number of small mammal niches) are all possible <br />reasons for the law populations levels observed on these tco types. Con- <br />versely, the riparian type provides habitat for tvo small mammal species with <br />narrow habitat requirements, the western harvest arouse and meadow vole. <br />Roth are generally found in riparian atuations only (Leichleitner 1969). <br />Moreover, the riparian type, in the form of an increased vegetation Dover, <br />results in both more species and a higher population level .i-i this habitat. . <br />Small Maimial Species. The deer mouse was captured in all vegetation types <br />sampled irr the stuay area. This nocturnal species is probably the most <br />abundant and widespread mammal in Colorado (I,echleitner 1969). The deer <br />mouse occurs in a variety of habitats, from deserts to marshes and from prai- <br />ries to above timberline. A total of 4 deer mice mere captured, representing <br />a total Yelative abundance over all`t}~.es of 0.7 individuals/100 trap nights. <br />The deer r.GUSe did not show an a°finity for a particular )'rabitat type. The <br />sex ratio of all deer mice captured was 0.75 females and 0.2~ males. <br />fteaoow vole habitat includes hoist areas with abundant supplies of grasses, <br />sedges or other green, succulent vegetation. The only habitat t~rith these <br />characteri sties in the study area is riparian and was the only habitat in <br />_29_ <br />JUN 1 1 t480 <br /> <br />(Revised July 2006) <br />Attachment 2.04.11-1-36 <br />