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Table 1. Species list, mean density (number per m2), and diversir.y values of <br /> ben[hic invertebrates collected from an unnamed tributary of Foidel <br /> Creek, Routt County, Colorado, 15 .Tuly 1981. <br /> Station No. 1 Station No. 2 Station No. 3 <br /> Organism Pool RifFl.e Pool Riffle Pool Riffle <br /> <br />' Nematoda 43 32 <br /> Oligochaeta 43 1,508 711 626 247 <br /> Hirudinea <br /> Glossiphoniidae <br /> Glossiphonia complanata 237 <br /> Helobdella stagnalis 205 22 <br /> Erobdellidae <br /> Dina parva 11 22 <br /> Cladocera 11 <br /> Copepoda 32 <br /> Amphipoda <br /> Talitridae <br /> Hyalella azteca 37.7 140 <br /> Cammaridae <br /> Gammarus sp. 76 <br /> Crangonyx sp. 820 <br /> Ephemeroptera <br /> Siphlonuridae 11 <br /> Bae[idae <br /> Baetis sp. 11 <br /> Odonaca <br /> Aeshnidae <br />~- Anax sp. 11 <br />,- <br />Trichoptera <br /> Hydroptilidae <br /> Hydropcila s.p. 22 <br /> Coleoptera <br /> Dytiscidae 11 <br />. Diptera <br /> pupae 32 <br /> Chironomidae 1,423 22 65 216 506 <br /> pupae 11 11 <br /> Ceratopogonidae 140 22 140 <br /> Tipulidae 32 <br /> Rhabdomastix sp. 22 <br /> Tabanidae <br /> Tabanus sp. 11 <br /> Chrysops sp. 65 <br /> Dixidae <br /> Dixa sp. 11 <br /> Gastropoda <br /> Phvsidae <br />' Physa sp. 11 22 43 <br /> Pelecypoda <br /> Sphaeriidae 3,750 <br />• Total Number Taxa 18 5 7 3 9 <br /> Total Number Organisms = <br />6,320 2,394 895 864 1,131 <br /> D 2.03 - 1.13 1.22 0.97 2.23 <br /> ~If no densities are presented under riffles, th en riffle habitat was not available <br /> for sampling and four pool samples were collect ed instea d of two samples. <br /> i~ <br />