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<br /> <br />1 <br />1 <br /> <br />fishes (Hinckley 1983, Tyus 1987). Hinckley (1983) cited two studies noting <br />egg predation by carp. Marsh and Langhorst (1988) reported significant <br />predation of wild larval razorback sucker by green sunfish, and Brooks et al. <br />(1985) documented significant predation of stocked larval and fingerling-size <br />razorback sucker by channel catfish and flathead catfish. <br />STREAM FLOW AND HABITAT NEEDS <br />Stream flow/Sediment Transport: Scientific studies of fluvial dynamics in <br />western streams can be traced to John Wesley Powells' expeditions down the <br />Colorado River in the late 1300's (Powell 1895). More recent recognition of <br />the dependency between upstream and downstream processes led to the concept of <br />dynamic equilibrium (i. e., the dynamic 'valance between discharge, channel <br />morphometry, and sediment load throughout the system) (Leopold et al. 1964). <br />Implicit to the understanding of dynamic equilibrium is the concept r_hat each <br />stream has a sediment transport capacity with respect to discharge and that <br />streams are continuously eroding to base level. We emphasize the importance <br />of these concepts (i.e., a systems-level perspective) in the study of stream <br />fish habitat because streams (and their watersheds) are longitudinally linked <br />systems (Vannote et al. 1980) and thus, downstream features (e.g., channel <br />morphometry, sediment load, temperature regimen, habitat availability, food <br />variability, biota) are directly influenced by upstream events. <br />Hydrologic conditions in the Yampa River are not significantly different <br />from historic conditions, and as indicated previously (rigure 1), flows of the <br />Yampa River are necessary for maintenance of spring peaks in the Green River <br />hydrograph. Therefore, relationships between discharge and sediment <br />transport in the Yampa River warrant consideration for protection of <br />37 <br />