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LIST OF FIGURES <br />Figure 1. Map of study area. <br />Figure 2. Mainstream barriers and their impacts in the Colorado River basin. <br />(Bars=location of barrier, dotting=downstream impact, shaded <br />areas=impoundments due to project completion). <br />Figure 3. Average annual hydrograph for the Green and Yampa rivers. Upper <br />figure for 1951-62; lower figure for 1967-88. USGS flow records: <br />Jensen=Green River at Jensen, Utah; Greendale=Green River below Flaming <br />Gorge Dam; Yampa=Yampa River at mouth. <br />Figure 4. Relation between average discharge, temperature, and initiation of <br />spawning migration for Colorado squawfish to Green River spawning grounds. <br />Solid vertical lines= average dates first and last radio-tagged fish moved <br />to spawning grounds; dashed vertical line= average date all radio-tagged <br />fish exhibited migratory movements; n= total number of radio-tagged fish. <br />Figure 5. Migration of radio-tagged Colorado squawfish (--), collections of <br />ripe fish (~), and dates of estimated egg deposition (- -), Green River, <br />1981-1988. (Q)= presence of radio-tagged fish on spawning grounds. <br />Figure 6. Relation between discharge and spawning of Colorado squawfish, <br />Green River, 1981-1988. Solid vertical bars delineate total spawning <br />period, dashed vertical bars delineate optimal spawning period. <br />Figure 7. Relation between discharge and spawning of humpback chub, Yampa <br />River, 1987-1989. Vertical bars delineate spawning period. <br />Figure 8. Relation between discharge and spawning of razorback sucker, Green <br />River, 1987-1989. Q= discharge, T= temperature. Vertical bars delineate <br />spawning period. <br />Figure 9. Conceptual relation between Green River annual distribution <br />hydrograph (USGS records; Jensen, Utah) and timing of life history events <br />of Colorado squawfish(CS), razorback sucker(RZ), and humpback chub (HB). <br />Spring= March 21-June 21; Summer= June 22-September 22; Autumn= September <br />23-December 21; Winter= December 22-March 20. M= migration, s= spawning, N= <br />nursery, W= winter. <br />45 <br />