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~1 <br />TADLE A-9 <br />DENSITIES (NO.JFT2) AND PERCENT' RELATIVE ABUNDANCES (%ItA) OF BENT}IIC PIACROINVERTEBRATES COLLECTED BY <br />SURBER SAMPLER AT STATION 3 IN 'PIIE WILLIAPIS FORK RIVER NEAR CRAIG, COLORADO <br />SEPTE}IBER 17 , 1981 <br />Taxa Rep 1 Rep 2 Rep 3 Rep 4 Mean °,6RA S.D. <br />Tricladida <br />Planariidae <br />DuResia ti rina 2 0.5 0.1 7.0 <br />Oligochaeta <br />Naididae <br />Nais sp. 1 0.2 <0.1 0.5 <br />a Gastropods <br />N Physidae <br />Physa sp. 1 2 4 1.8 0.4 1.7 <br />Ephemeroptera <br />Baetidae <br />Baetis insignificans 1 1 3 1 1.5 0.3 1.0 <br />Daetis sp. 8 4 11 23 11.5 2.6 8.2 <br />Ephemeridae <br />Ephemera sp. 3 2 2 1.6 0.4 1.3 <br />Ephemerellidae <br />Ephemerella sp. 26 3 15 12 14.5 3.3 10.3 <br />}leptageniidae <br />Rithrogena sp. 1 1 S 7 3.5 0.8 3.0 <br />Leptophlebiidae <br />Paraleptophlebia sp. 1 2 0.8 0.2 1.0 <br />Tricorythidae <br />Tricorythodes sp. 46 8 5 25 21.0 4.7 18.9 <br />.._f.Y ~~ <br />