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C~ <br /> <br />DENSITIES (N0./FTZ) <br />BY SURBER <br />TABLE A-8 <br />AND PERCENT RELATIVE ABUNDANCES (%RA) OF <br />SAMPLER AT STATION 2 IN THE WILLIAMS FORK <br />SEPTEMBER 17, 1981 <br /> <br />BEN'PHIC t1ACR0INVERTEBRATES <br />RIVER NEAR CRAIG, COLORADO <br /> <br />COLLECTED <br />Taxa Rep 1 Rep 2 Rep 3 Rep 4 Mean °,6RA S.D. <br />Tricladida <br />Planariidae <br />Dugesia tigrina 1 0.2 0.2 0.5 <br />Ephemeroptera <br />Baetidae <br />Baetis insignificans 2 0.5 0.4 1.0 <br />Baetis sp. 21 10 36 10 19.3 16,3 12.3 <br />9, Ephemerellidae <br />,o Ephemerella sp. 7 2 2.2 1.9 3.3 <br />Neptageniidae <br />Reptagenia sp. 1 0.2 0.2 0.5 <br />Rithrogena sp 6 9 13 17 9.8 8.3 3.0 <br />Leptophlebiidae <br />Paraleptopl~lebia sp. 1 0.2 0.2 0.5 <br />Tricorythidae <br />Tricorythodes sp. 3 0.8 0.7 1.5 <br />Plecoptera <br />Perlidae <br />Claassenia sabulosa 6 1.5 1.3 3.0 <br />Perlodidae <br />Isoperla sp. 1 0.2 0.2 0.5 <br />