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.l1 <br />TABLE A-6 <br />DENSITIES (No./Etz) AND PERCENT RELATIVE ABUNDANCES (°~RA) OF BENT1}IC <br />MACROINVERTEBRATES COLLECTED BY SURBER SAMPLER AT STATION 3 <br />IN THE WILLIAMS FORK RIVER NEAR CRAIG, COLORADO <br />JUNE 10, 1981 <br />Taxa Rep 1 Rep 2 Rep 3 Rep 4 Mean °,6RA S.D. <br />Oligochaeta <br />Tuhificidae <br />Limnodrilus sp. 1 0.2 0.3 0.5 <br />Castropoda <br />Physidae <br />Ph sa sp. 2 4 l.5 2.5 1.9 <br />w Ephemeroptera <br />Baetidae <br />Baetis.sp. 2 0.5 0.8 1.0 <br />Ephemerellidae <br />T~hemerella sp. 6 5 27 11.9 19.5 9.5 <br />Ephemeridae <br />' }lexagenia sp 1 0.2 0.3 0.5 <br />}leptageniidae <br />Heptagenia sp. 1 0.2 0.3 0.5 <br />Rithrogena sp. 3 0.8 1.3 l.5 <br />Leptophlebiidae <br />Paraleptophlebia sp. 1 3 1.0 1.6 1.4 <br />Tricorythidae <br />Tricorythodes sp. 4 3 2 27 9.0 14.8 12.0 <br />Plecoptera <br />Perlidae <br />Claassenia sp. 1 0.2 0.3 0.5 <br />Perlodidae <br />Iso erla sp. 3 1 5 2.2 3.6 2.2 <br />