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<br /> TABLE A-5 <br /> DENSITIES (No. /ftz) AND PERCENT RELATIVE ABUNDANCES (°/,RA) OF BENTi]IC <br /> MACROINVERTEBRATES COLLECTED BY SURB ER SAMPLER AT STATION 2 <br /> IN THE WILLIAMS FORK RIVER NEA R CRAIG, COLORADO <br /> JUNE ]0, 1981 <br />Taxa Rep 1 Rep 2 Rep 3 Rep 4 Mean °,(RA S.D. <br />Ephemeroptera <br />Baetidae <br />Baetis sp. S 2 1.7 6.8 2.4 <br />Ephemerellidae <br />Ephemerella sp. 4 11 2 5 5.5 22.1 3.9 <br />Heptageniidae <br />}]eptagenia sp. 1 l 0.5 2.0 0.6 <br />~ Rithrogena sp. 1 10 2.8 11.2 4.8 <br />Leptophlebiidae <br />Paraleptophlebia sp. 1 0.2 0.8 0.5 <br />Tricorythidae <br />Tricorythodes sp. 3 2 1.3 5.2 1.5 <br />Odonata <br />Gomphidae <br />Ophiogomphus sp. 1 0.2 0.8 0.5 <br />Plecoptera <br />Perlodidae <br />Isoperla sp. 2 1 0.7 2.8 1.0 <br />ilemiptera <br />Naucoridae <br />Ambrysus sp. 1 0.2 0.8 0.5 <br />~' <br />