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<br />intensity fzun different vegetation types. Indices of relative abundance for tiara <br />{ on predators obtained from the scent station visitation technique are provided by <br />a formula developed by the Denver Wildlife Research Center (iinhar+ and <br />Knowlton 1973) : <br />Total number of visits by species <br />Index = X 1000 <br />Total ntRnber of operable station nights <br />Species Diversity Index. An index to species diversity is provided for certain <br />Habitat types for certain groups of art ~~s. This index is based on the <br />Shannon-Weiner function frcxn the field of information theory (Margalef 1967; <br />MacArthur and Mac~irthtu: 1971; Lloyd and Ghelardi 1969; Pielou 1966). Rs a <br />diversity index for community analysis, the function describes the average <br />degree of uncertainty of predicting the species of a given individual picked at <br />random from .the cafmunity. This uncertainty and the index increase both as the <br />number of species increases and as the individuals are distributed ;rare and more <br />ern ~i tably a:rong species already present. The general formula for this index is <br />as follows: <br />H Lpi ~e Pi <br />where pi decimal fraction of total individuals belonging to the ith species. <br />• ~~ This index varies from values of 0 for habitats containing a single species to <br />values of 4 or S for oommuLities con*a+*++~g many species, each with a small <br />number of individuals. The Shannon tQeiner species diversity index may be used to <br />~nrnviity ccngvsition data from a variety of sources. Difference in <br />diversity may be expected for commuLities at different stages of succession, <br />in different habitats or at different times of the year. <br />Habitat Affinities. Most animal species depend upon their immediate surroundings <br />tv provide basic regturermnts for food, shelter and water. De*P~-~+t*+ation of <br />habitat affinities within the mr'toal range of a species may indicate its <br />partic-ular needs for survival and continued growth and reproduction. In general, <br />an ani.rt.31 's habitat may be characterized by the prE~awuinant vegetation. Elraiuation <br />of distribution abundance patterns of different a.,;,.,at species within and betw~~n <br />vegetation types provides a measure of habitat atfinity. <br />If all ~^~^+~~ species in an area wNre randomly distributed with respect to <br />-14- <br />L } <br />• <br />J U M 1 1 t480 <br />(Revised August 2006) Attachment 2.04.10-10-21 <br />