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Table 5. Species list, mean density (number per m2), and diversity values of <br />• benthic invertebrates collected from Middle Creek, Routt County, <br />Colorado, 15 and 16 Suly 1981.1 <br /> <br />Organism <br />Nematoda <br />Oligochaeta <br />Amphipoda <br />Talitridae <br />Hyalella azteca <br />Decapoda <br />Astracidae <br />Ephemeroptera <br />Baetidae' <br />Baetis sp. <br />Tricorythidae <br />Tricorythodes sp. <br />Trichoptera <br />Hydropsychidae <br />Hydropsyche sp. <br />Cheumatopsyche sp. <br />Hydroptilidae <br />Hydroptila sp. <br />pupae <br />Coleoptera <br />Elmidae - adult <br />Zaitzevia sp. - larvae <br />Dubiraphnia sp. - larvae <br />Diptera <br />Chironomidae <br />pupae <br />Ceratopogonidae <br />Simuliidae <br />Simulium sp. <br />Anthiomyidae <br />Limnophora aeguifrons <br />Athericidae <br />Atherix sp. <br />Stratiomyidae <br />Stratiomys sp. <br />Tipulidae <br />Hexatoma sp. <br />Polecypoda <br />Sphaeriidae <br />Total Number Taxa <br />Total Number Organisms <br />D <br />Station No. 1 Station No. 2 Station No. 3 <br />Pool <br />22 <br />2,866 <br />Riffle Pool Riffle Pool <br />22 172 172 11 <br />496 7,069 1,875 1,379 <br />Riffle <br />43 <br />32 <br />1,013 97 11 <br />43 75 <br />2,188 830 <br />3,243 1,799 <br />884 722 <br />22 22 <br />108 65 <br />75 65 <br />22 345 <br />4,515 1,897 1,767 1,045 <br />97 22 <br />86 43 22 <br />3,071 <br />11 11 <br />11 <br />11 <br /> <br />f <br />i <br /> <br />~, • <br />22 <br />2,133 <br />86 <br />11 <br />4 <br />5,129 <br />1.06 <br />43 <br />18 4 13 6 - <br />15,993 9,483 7,576 2,511 - <br />2.71 1.06 2.62 1.23 - <br />If no densities are presented under riffles, then riffle habitat was not available <br />for sampling and four pool samples were collected instead of two samples. <br />18 <br />