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Activities of the Upper Colorado River Endangered Fish Recovery Program (Recovery Program) include habitat improvement and management (e.g., restoration of flooded bottomlands, provision of fish passage) and flow management to provide suitable habitat conditions for the four species of endangered fishes in the Upper Colorado River Basin — Colorado pikeminnow (Ptychocheilus lucius), humpback chub (Gila cypha), bonytail (Gila elegans), and razorback sucker (Xyrauchen texanus). In this report, we identify and apply an approach for prioritizing river reaches and habitats for geomorphic research in the Upper Colorado River Basin. The goal of this project was to identify priorities for geomorphology research in endangered...
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Larval and juvenile Colorado pikeminnow (Ptychocheilus lucius) use shallow, low-velocity, channel-margin areas (backwaters) as nursery habitats. It is hypothesized that within-day flow fluctuations caused by hydropower operations can directly affect the suitability of such habitats by altering water temperature and habitat geometry. Despite the importance of backwaters to juvenile fishes, there is a lack of established approaches for modelling how river management affects these habitats. Here, we describe a physical habitat model that predicts the effects of mainstem flow variation on backwater temperature, geometry and invertebrate availability. We specifically modelled these effects on habitat in a portion of...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Colorado pikeminnow,
Flaming Gorge Dam,
Green River,
River Research and Applications,
backwater habitats, All tags...
flow fluctuations,
invertebrate production,
simulation modeling,
temperature, Fewer tags
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