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_ _ <br />intensity from different vegetation types. Indices of relative abundance for data <br />on predators obtained fr~n the scent station visitation technique-are provided by <br />a formula developed by the Denver wildlife Research Center (Linhart and <br />Krxn~lton 1973) <br />Total number of visits by species <br />Index = X 1000 <br />Total number of operable station nights <br />Species Diversity Index. An index to species diversity is provided for certain <br />habitat types for certain groups of anu~ls. This index is based on the <br />Shamm~-Weiner function from the field of information theory (Margalef 1967; <br />MacArthur and MacArthur 1971; Lloyd and Ghelardi 1964; Pielou 1966). As a <br />diversity index for conmur~ity analysis, the function describes the average <br />degree of uncertainty of predicting the species of a given individual pieJced at <br />random from the ccamiunity. This uncertainty and the index increase both as the <br />number of species increases and as the individuals are distributed rtnre and more <br />Pr~:;tably among species already present. The general formula for this index is <br />as follvis: <br />H = Epi loge Pi <br />where pi = decimal fraction of total individuals belonging to the ith species. <br />This index varies from values of O for habitats containing a single species to <br />values of 4 or 5 for c~mnuiities containing many species, each with a small <br />number of individuals. The Shannon-i4einer species diversity index may be used to <br />ca7g~are oa~nwii.ty ocvrgosition data from a variety of sources. Difference in <br />diversity may be expected for cwcmunities at different stages of succession, <br />in different habitats or at different Limes of the year. <br />xabitat Affinities. Most animal species depend upon their immediate surro~v~dings <br />to provide basic requirements for food, shelter and water. Determination of <br />habitat affinities within the mrmal range of a species may indicate its <br />particular needs for survival and continued growth and reproduction.-In general, <br />an animal's habitat may be characterized by the predor~unait vegetation. Evaluation <br />o£ distributionabundance patterns of different animal species within and bet~~en <br />vegetation types provides a imasure of habitat affinity. <br />I£ all animal species in an area were randomly distributed with respect to <br />-14- <br />L ? <br />`J <br />J U M 1 1 t980 <br />(Revised July 2006) Attachment 2.04.11-1-21 <br />