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~~ 4 ~ <br />TADLE 5 <br />DENSITIES <br />COLLECTED (N0./FTz) <br />BY SURBER AND PERCENT RELATIVE ABUNDANCES (~ RA) OF <br />SAMPLER AT STATION 3 1N TIIE WILLIAMS FORK <br />NOVEMBER 5, 1960 BENTIIIC MACROINVERTEBRATES <br />RIVER NEAR CRAIG, COLORADO <br />Taxa Rep. 1 Rep. 2 Rep. 3 Rep. 4 Mean % RA S. D.~ <br />Oligochaeta <br />Naididae 2 0.5 0.2 1.0 <br />Castropoda <br />Physldae <br />Physa sp. 2 2 13 23 10.0 4.8 10.1 <br />Ephemeroptera <br />^' Baetidae <br />V <br />Baetie sp. 3 3 1 4 2.8 1.3 1.2 <br />Ephemerellidae <br />Ephemerella sp. 15 21 37 13 21.5 10.4 10.9 <br />Ileptageniidae <br />Meptagenia sp. 2 0.5 0.2 1.0 <br />Rithrogena sp. 57 2 10 18 21.7 10.5 24.4 <br />Leptophlebiidae <br />Paraleptophlebia sp. 1 1 11 3.3 1.6 5.2 <br />Tricorythidae <br />Tricorythodes sp. 7 3 2 3.0 1.4 2.9 <br />Plecoptera <br />Capniidae <br />Capnia ap. S 1.2 0.6 2.5 <br />Chloroperlidae <br />Alloperla sp. 1 0.2 0.1 0.5 <br />Perlodidae <br />Isoperla sp. 6 1 4 4 3.8 1.8 2.1 <br />~ -.J <br />