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<br />Table 2. Mean zooplankton (cladocerans and copepods) and benthic chironomid <br /> densities in various aquatic habitats of the Upper Colorado River <br /> Basin. <br /> Zooplankton density Benthic <br />River/ cladocerans copepods chironomids <br />Habitat Date (no./l) (no./l) (no. 1m2) Reference <br />Middle Green River <br />( 0 u r ay N a t ion a 1 <br />Wildl ife Refuge) <br />Main Channel 7/91 0.025 1.288 4,150 1/ Mabey and <br /> 8/91 0.008 0.308 3,516 Schiozawa 1993 <br /> & <br /> 1/ Wolz and <br /> Schiozawa 1995 <br />Large backwater 6/91 0.188 63.17 II <br />(Intersection <br />Wash) <br />Ephemera 1 side <br />channel 6/91 2,325 " <br /> 7/91 8,185 " <br />Backwater (Ouray) 7/91 1.263 5.857 31,125 " <br /> 8/91 0.484 0.985 22,863 II <br />Floodplain 6/91 30.77 175.12 903 II <br />(Old Charlie Wash)7/91 3.99 307.41 23,055 II <br /> 8/91 3.42 686. 77 3,955 II <br />Colorado River <br />(Moab Slough) <br />Main Channel 6-10/93 0 0 156 l/ Cooper and <br /> Severn 1994a <br />Backwater 6-10/93 0.98 0.49 82.5 " <br />Bullrush 6-10/93 28.6 10.3 447 " <br />Open Water 6-10/93 19.7 14.8 241 \I <br />Flooded Willows 6-10/93 12.8 4.43 " <br />Middle Green River <br />(Escalante Ranch) <br />Main Channel 6-10/93 0 0 349 '1:./ Cooper and <br /> Severn 1994b <br />Backwater 6-10 /93 7.19 2.6 349 II <br />Bullrush 6-10/93 2.70 1.0 349 II <br />Open Water 6-10-/93 10.6 11. 2 631 II <br /> <br />31 <br />