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Task 10 An evaluation of fish predation in backwater habitats in <br />the <br />Green River. <br />Description of work: <br />Task 10 is a requested new start (RIP new emphasis: Management <br />of Non-native Fishes) under the lead of the FWS. The main <br />purpose of the study is to determine if competitive interaction <br />between introduced and native fishes is a significant factor <br />contributing to the decline of endangered species populations. <br />The project will examine fish competition in Colorado squawfish <br />nursery habitats by determining if fish predation in backwaters <br />has an impact on the structure and function of benthic and <br />planktonic communities. Specific objectives of the study <br />include: <br />1) Determine invertebrate densities, changes in backwater <br />community structure, and production estimates for the <br />dominant invertebrate species. <br />2) Evaluate the relationships between river flows and standing <br />crops of food organisms. <br />3) Evaluate the role of fishes in structuring invertebrate <br />communities habitat exclusion. <br />4) Evaluate resource competition by fishes in backwater <br />habitats. <br />5) Design studies to evaluate exploitative and interference <br />competition as needed. <br />The study is needed to help determine the significance of <br />species interactions so that intelligent management strategies, <br />including flow manipulation can be devised. <br />- Hypotheses to be Tested: 3,4,7,9,12 <br />Deliverables: <br />An annual report for the project would be submitted by the end <br />of the fiscal year. <br />1992 Budget': <br />-Labor $13,500 <br />-Travel $ 300 <br />-Equipment $ 200 <br />-Total $14,000 <br />Habitat Management - Research/Restoration <br />Task 11. Wetlands restoration/demonstration project at old Charley <br />Wash. Ouray National Wildlife Refuge. Utah. <br />Description of work: <br />'Does not include FWS overhead <br />B9