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TABLE 4 <br />DENSITIES (N0./FTz) AND PERCENT RELATIVE ABUNDANCES (X RA) OF BENTIIIC HACROINVERTEBRATES <br />COLLECTED BY SURBER SAMPLER AT STATTON 2 IN TIIE WILLIAHS FORK RIVER <br />NEAR CRAIG, COLORADO, NOVEHBER 5, 1980 <br />Taxa Rep. 1 Rep. 2 Rep. 3 Rep. 4 Mean X RA S. D.1 <br />Oligochaeta <br />Naididae <br />Ephemeroptera <br />Baetidae <br />Baetie ep. <br />Ephemerellidae <br />Ephemerella ep. 11 <br />Heptageniidae <br />~, Ileptagenia sp. 2 <br />"' Rithrogena sp. 29 <br />Leptophlebiidae <br />Paraleptophlebia sp. 13 <br />Siphlonuridae <br />Unknown genus 1 <br />Tricorythidae <br />Tricorythodea sp. 7 <br />Plecoptera <br />Perlidae <br />Claassenia sp. 1 <br />Perlodidae <br />Isogenoidea sp. 7 <br />Isoperla sp. S <br />Trichoptera <br />Bcachycentridae <br />Brachycentrua ap. 2 <br />Helicopsychidae <br />Ilelicopsyche sp. <br /> <br /> <br />1 0.2 0.1 0.5 <br /> 3 1 I.0 0.4 1.4 <br />24 29 9 18.3 7.8 9.8 <br />2 4 2 2.5 1.1 1.0 <br />39 59 24 37.7 16.0 15.5 <br />6 3 6 7.0 3.0 4.2 <br /> 0.2 0.1 0.5 <br />4 2.8 1.2 3.4 <br />1 1 0.7 0.3 0.5 <br /> 1.8 0.8 3.5 <br />5 3 2 3.7 1.6 1.5 <br />7 1 2 3.0 1.3 2.7 <br />1 1 ~ 0.5 0.2 0.6 <br /> <br />