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~• <br />TABLE A-7 <br />DENSITIES (N0./FTZ) AND PERCENT RELATIVE ABUNDANCES (°,6RA) <br />MACROINVERTEBRATES COLLECTED BY SURBER SAMPLER AT STATION <br />WILLIAMS FORK RIVER NEAR CRAIG COLORADO, SEPTEMBER 17, <br /> <br />OF BENTIIIC <br />1, IN T1iE <br />1981. <br />Taxa Rep 1 Rep 2 Rep 3 Rep 4 Mean °tiRA S.D. <br />Oligochaeta <br />Naididae <br />_ Pristina sp. 7 0.2 0.1 0.5 <br />Castropoda <br />Ancylidae <br />Ferrissia sp. 1 1 0.5 0.2 0.6 <br />Physidae <br />v Physa sp. ] 1 0.5 0.2 0.6 <br />rn <br />Ephemeroptera <br />Baetidae <br />Bae[is sp. 12 10 17 9 12.0 4.7 3.6 <br />Baetis , <br />insignificans 4 1 1.3 0.5 1.9 <br />Ephemeridae , <br />Ephemera sp. I 0.2 0.1 0.5 <br />Ephemerellidae <br />Ephemerella sp. 8 8 3 7 6.5 2.5 2.4 <br />Heptageniidae <br />Heptagenia sp. 1 0.2 0.1 0.5 <br />Rithrogena sp. 8 16 6 15 11.2 4.4 5.0 <br />Tricorythidae <br />Tricorythodes sp. 1 2 2 ].3 0.5 1.0 <br />Odona[a <br />Gomphidae <br />O~hiogomphus severus 1 0.2 0.1 0.5 <br />~\. <br />