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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 1964-84. 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 <br />exhibited movement to spawning grounds; dashed vertical line=average date <br />all radio-tagged fish exhibited migratory movements; n=total number of <br />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. C~ indicates 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 some life history <br />events of Colorado squawfish, razorback sucker, and humpback chub. <br />Spring=March2l-June21; Summer=June 22-September22; Autumn=September 23- <br />December 21; Winter=December 22-March 20. CS=Colorado squawfish, <br />HB=humpback chub, RZ=razorback sucker, M=migration, s=spawning, N=nursery, <br />W=winter. <br />38 <br />