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LIST OF TABLES (continued) Table 11. Achi-square analysis for habitat preference by YOY Gila spp. for habitats deeper than 0.7 m in the Westwater Canyon sub-reach (Colorado RK 204 - 199.4), of Westwater Canyon, Utah. Data collected in late July and August, 1992, 1994, 1995, and 1996, and August -Sept., 1993 ............ .......... 13 ..................... Table 12. Multinomial analysis for use of habitats by YOY Gila spp. in the Below Canyon sub- reach (Colorado RK 185.6 - 176.0), Westwater Canyon, Utah. Data collected in July and August, 1992, 1994, and 1996, and July -Sept., 1993 and 1995 ................. 13 Table 13. Multinomial analysis for habitat preference by YOY Gila spp. based on actual numbers of fish collected by habitat type in the Below Canyon sub-reach (Colorado RK 185.6 - 176.0), of Westwater Canyon, Utah. Data collected in July and August, 1992, 1994, and 1996, and July -Sept., 1993 and 1995 ......................................... 14 Table 14. Pearson correlation coefficients (PC) and associated levels of significance (p) for August catch rates (fish/ m2) vs. peak flow as recorded at the State Line, Utah, USGS gage station; 1992-1996 .............................................................. 15 Table 15. Three cohorts of Gila spp. that were tracked through their third growing season. Lengths refer to the modal peaks as identified in length frequency analyses (Appendix Table 4). All fish were collected in Westwater Canyon (Colorado River miles 199.2 - 119); 1992- 1996. Dates refer to fish community monitoring trips ............................ 15 Table 16. Growth of three size classes of humpback and roundtail chub recaptured in Westwater Canyon, Colorado River; 1992-1996. Time elapsed between capture is not factored in average growth values ..................................................... 19 Table 17. Lincoln-Peterson population estimates and associated 95% confidence intervals (CI) or humpback and roundtail chubs at each of the three study sites ...................... 20 Table 18. Matrix of environmental conditions contributing to Age 0 to Age 1 Gila spp. survival in Westwater Canyon, Colorado River, Utah; 1992 - 1996 ........................... 24 Appendix Table 1. List of species (common, scientific names, and as abbreviated in figures) collected in the Westwater Canyon Study: 1992-1996 .................... 59 Appendix Table 2. Definitions of low velocity, secondary habitat types used in the YOY analyses, Westwater Canyon, Colorado River; 1992 -1996. Primary habitat was referred to as main or side channel .......................................... 61 Appendix Table 3. Summary of YOY sampling efforts by sub-reach in Westwater Canyon, Colorado River; 1992-1996. Refer to Appendix Table 1 for species abbreviations. Only natives and most common non-natives presented ....... 62 v