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LIST OF FIGURES AND TABLES <br />Figure/Table <br />General Introduction <br />Page <br />1. Map of Colorado River Basin ......................................... <br />Chapter 1: Juvenile Bonytail - Red Shiner Interactions: Substrate and <br />Velocity Selection Effects <br />1.1 Substrate selection by bonytail without red shiners present (low flow) ......... <br />1.2 Substrate selection by bonytail with and without red shiners present <br />(low flow). Day and night combined ................................... <br />1.3 Depth selection by bonytail by substrate without red shiners present (low flow) . . <br />1.4 Depth selection by bonytail in substrate experiments with boulders and without <br />red shiner present (low flow) ................. ........................ . <br />1.5 Velocity selection by bonytail without substrate and with and <br />without red shiners present (day and night combined) ..................... <br />1.6 Depth selection by bonytail in flow experiments without substrate and <br />with and without red shiners present (day and night combined) .............. <br />1.7 Depth selection by bonytail in flow experiments without substrate and <br />with red shiners present (nighttime only) ................................ <br />1.8 Depth selection by bonytail in flow experiments without substrate and <br />with red shiners present (daytime only) ................................. <br />Chapter 2: The Role of Introduced Fishes in the Green River <br />2.1 Predation risk (vulnerability) based on prey size produced by model # 1.. ...... <br />2.2 Predation risk (vulnerability) based on prey size produced by model #2 ........ <br />2.3 Predation risk (vulnerability) based on prey size produced by model #3. ....... <br />2.4 Relative abundance of introduced predators by size class collected June-Sept. <br />1994, Green River, Utah ............................................. <br />2.5 Predator density by predator species per square meter of river surface area <br />sampled, Green River, Utah, June - Sept. 1994 ........................... <br />2.6 Relative predation risk in context of predator density (by size class) for the Green <br />River, Utah, summer 1994 . .......................................... <br />V1