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TABLE 4 00 <br />ABUNDANCE OF BENTHIC INV ERTEBRATES ON R UBBLE-GRAVEL SUBSTRATES, LITTLE HOLE, <br />GREEN RIVER, 1965 AND 1 967 - EXPRESSED AS MEAN N UMBER PER M2 C <br /> H <br /> 1965 1967 x <br /> June July Aug. Aug. Sept. Nov. July July July Aug. Aug Aug. Oct. <br />Organism 14 9 7 26 19 4 8 22 29 5 12 19 14 y <br /> d <br />Nematoda 11 <br />Oligochaeta 3206 118 2378 829 3217 215 462 172 172 108 269 1625 1657 ?c <br /> <br />Hydracarina <br />11 <br />22 <br />32 <br />11 <br />43 110 <br />0 <br />Plecoptera <br />Iso perla 11 d <br />Arcynopteryx 11 11 z <br />Ephemeroptera <br />Ba.etissp.1 839 721 40124 19465 1754 6811 409 129 161 581 1033 592 75 C <br /> <br />Baetis sp. V <br />11 <br />22 O <br />L_ <br />Paraleptophlebia <br />pallipes 11 11 b <br />Trichoptera ? <br />Agraylea 11 <br />Diptera <br />Tipulidae 11 11 11 <br />Simuliidae 3271 20261 12460 1022 16355 22 43 32 86 990 839 183 <br />Chironomidae 4390 7306 5219 9006 7123 7995 8511 7081 7091 4143 3239 2733 4089 <br />.