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Last modified
7/14/2009 5:02:34 PM
Creation date
6/1/2009 11:55:07 AM
Metadata
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Template:
UCREFRP
UCREFRP Catalog Number
9323
Author
Cooper, D. J. and C. Severn.
Title
Wetlands of the Ouray National Wildlife Refuge, Utah
USFW Year
1994.
USFW - Doc Type
Hydrology, Water Chemistry, Vegetation, Invertebrate Communities, and Restoration Potential.
Copyright Material
NO
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INVERTEBRATES <br />Introduction <br />Recent research indicates that several invertebrate taxa <br />are important to larval and juvenile fish. The Chironomidae and <br />Crustaceans Cladocera and Copepoda are important food for these <br />fish. Grabowski and Hiebert (1988) analyzed stomach contents <br />from many species of fish at different developmental stages. <br />Their work was performed during 1987-88 on the Green River in <br />backwater and riverine habitats from Island Park to Ouray <br />National Wildlife Refuge. They reported that chironomids were by <br />far the most frequently encountered prey in the stomachs of all <br />the fish studied. A study conducted by Marsh and Langhorst <br />(1988) of wild larval razorback suckers diet in Lake Mohave and <br />an adjacent backwater at Arizona Bay found that Cladocera and <br />Copepoda made up a greater frequency of the diet than other <br />available taxa. This study, which occurred in a lentic as <br />opposed to the lotic environment studied by Grabowski and <br />Hiebert, also found a greater selection of Cladocera than <br />Copepoda in relationship to availability. <br />A key objective of the present study was to determine the <br />suitability of study wetlands along the Green River as habitat <br />for rearing endangered fish. Three key aspects of habitat <br />suitability are hydrologic regime, chemical environment and food <br />availability. The hydrology and water chemistry variables were <br />discussed above, and this section discusses food availability. <br />Bulrush, open water-aquatic, flooded cottonwood, river <br />backwater, and river channel communities were sampled for <br />invertebrates at this site. The river community was used as a <br />control to compare food resources available in the channel to <br />those in other communities. <br />Our analyses emphasize the following water column <br />invertebrate groups: 1) Cladocera, 2) Copepoda, 3) Chironomidae, <br />4) all other insects less the Chironomidae, and 5) all other <br />invertebrates which include Gastropods, Hydra, Nematoda, and <br />Protozoa. Taxonomic divisions presented for benthic <br />invertebrates are: 1) Chironomidae and 2) other invertebrates <br />which include Gastropods, Nematoda, Odonata, Hemiptera, <br />Ephemeroptera, Coleoptera, and Culicidae. <br />Water column invertebrate data is typically reported as <br />number L'1 while benthic invertebrate densities are typically <br />reported as number mZ. Benthos data was converted to a volume <br />basis so that the two strata can be compared. When applicable, <br />two Y axes are displayed to include both number L'1 and number m'Z <br />for benthic invertebrates. Benthic samples were collected to a <br />depth of 2 cm. A liter of this material would comprise an area <br />of approximately 0.05 mZ. It is important to remember when <br />20 <br />
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