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<br />• <br />turbidimeter. Alkalinity and conductivity were analyzed by Front Range <br />Lab Inc. in Fort Collins, Colorado using methods outlined in American <br />Public Health Association et al. (1978). Physical characteristics <br />observed at each station included substrate type, depth, and river flow. <br />Laboratory analyses for the Surber samples included taxonomic <br />identification and enumeration. Organisms were sorted from each sample <br />by hand under a 2% illuminated magnifier and placed into labeled vials <br />containing 70~ isopropanol and glycerin. All sorted macroinvertebrates <br />were identified to the lowest possible level practicable, using the <br />following references: Baumann et al. 1977, Beck, 1976, Brinkhurst 1968, <br />Brown 1972, Burks 1953, Edmondson 1959, Edmunds et a1. 1976, Hilsenhoff <br />1975, Mason 1973, Pennak 1953, Ross 1944, Usiager 1956, and Wiggins <br />1977. <br />Clewing and slide mounting techniques were necessary for identi- <br />ficacion of larval Chironomidae and Oligochaeta, for which methods <br />proposed by Beck (1976) and Brinichurst (1968) were employed. <br />Final data output included densities, percent relative abundances, <br /> <br /> <br />and species diversity. Densities (nucober/ft2) and percent relative <br />abundances were calculated for all organisms using a Monroe 1860 program- <br />mable calculator. Calculation of species diversity was based upon <br />Shannon and Wiener (1963). The indices were calculated using all taxa, <br />although the level of identification often varied <br />equations were as follows: <br />Computational <br />3 <br />