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<br />vegetation distribution (m habitat affinities), then the proportion of <br />individuals of a species encountered in a particular vegetation type would <br />correspond to the proportion of tl:e sartq~Iing effort demoted to r;,at <br />vegetation type. For example if 308 of the small mammal live traps were <br />established in uplazui sagebrush, then 308 of the total number of individuals <br />of all species captured over all sailing transects would have been caught <br />in the upland sagebrush habitat if the species were distributed ra -'n.~tly. <br />Conversely, if 90ff of all Perocrtyscus~naniculatus (deer mouse) captures <br />occurred in the upland sagebrush type. this would indicate a desinite <br />affiru ty of P. maniculatus for the upland sagebrush vegetation type. <br />The Chi-squazcs test (Snedecor and Cochran 1967) was used to determine <br />if the differ~^ between the observa3 nt>mbes of captures for a given <br />species in a given vegetation type and the number of captures expected on <br />the basis of a random distribution was significant. '19~e Chi-square <br />statistic, XZ, is given by: <br />E <br />Where: <br />Oi =observed number of captures (or encounters) for halaitat i <br />Ei =expected number o£ captures in habitat i based on a random <br />distribution arrong habitats. <br />The calculated Chi-square value was dared to aChi-square table to determine <br />if a significant difference between observed and expected number of captures <br />occurred at the 958 confidence level. if a significant difference did exist, <br />individual. Chi-~++a+A values £or individual habitats were exaiN.ned to provide <br />an indication of those habitats for which a species shows an affinity or an <br />awidance. <br />-15- <br />L <br />• JUN 1 1 t980 <br />(Revised August 2006) Attachment 2.04.10-10-22 <br />