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Species Diversity <br />s ~ <br />d = € (Nl log 2 Nl~ ~. <br />where: <br />d = species diversity index <br />N = total number of organisms per sample <br />ni = number of individuals per taxon <br />Equitability <br />E = d <br />d <br />maz <br />where: <br />E = equitability <br />d = observed species diversity <br />dmax - maximum species diversity = 1og25 <br />S = number of species in sample. <br />A students "t" test was used to evaluate statistical differences in <br />means of total macroinvertebrate densities at each station. The following <br />equation represents the procedure for the test: <br />xl - xz > to <br />S.Ep <br />where: <br />xl = mean observed at Station 1 <br />xz = mean observed at Station 2 <br />S.Ep = pooled standard errors <br />to = level of significance. <br /> <br />4 <br />