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• repeated until no organisms were visible. The material is the sieve was <br /> concentrated to one side and unshed into a sample jar. All sampled <br /> material was preserved with 10 percent buffered formalia/water mixture <br /> and labeled properly. <br /> Laboratory analyses for Surber samples included taxonomic ideatifi- <br />_ cation and enumeration. Organisms were sorted from each sample by hand <br /> and placed into labeled vials containing 70 percent isopropanol and <br /> glycerin. All sorted macroiavertebrates were identified to the lowest <br /> possible level practicable, using the following references: Baumann et <br /> al. (1977), Beck (1976), Briakhurst (1968), Brovn (1972), Burks (1953), <br /> Edmondson (1959), Edmunds et al. (1976), Hilseahoff (1975), Mason (1973), <br /> Peanak (1953), Ross (1944), Usinger (1956), and Wiggins (1977). <br /> Cleaning and slide mounting techniques were necessary for identi- <br /> fication of larval Chiranomidae and Oligochaeta, following methods <br /> described by Seck (1976) and Brinkhurst (1968). <br /> Final data output included densities (number/fry), percent relative <br /> abundances, and species diversity. Densities and percent relative <br /> abundances vere calculated far all organisms using a Honroe 1860 program- <br /> mable calculator. Calculation of species diversity was based upon <br /> Shannon and Wiener (1963). The index was calculated using all taxa, <br /> although the level of identification often varied. Computational <br /> equations were as follows: <br />Species Diversity <br />s <br />d = F (Nl logy N1) <br />1 <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 />a <br />max <br /> <br />3 <br />