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Figure 15. Average number of aquatic insects collected from the <br /> White River from July 1975 to September 1976. 99 <br />Figure 16. Change in percentage composition of the major orders <br /> for the sampling sites of the White River, Colorado, <br /> July 1975, to September 1976. 101 <br />Figure 17. Seasonal changes in total abundance of aquatic <br /> insects on the Yampa River, July 1975 to October <br /> 1976. 102 <br />Figure 18. Seasonal change in abundance of the major orders <br /> of aquatic insects of the Yampa River, July 1975 <br /> to October 1976. 103 <br />Figure 19. Seasonal change in percentage composition of the <br /> major orders of aquatic insects of the Yampa River, <br /> Colorado . 107 <br />Figure 20. Seasonal changes in total abundance of aquatic <br /> insects on the White River, July 1975 to October <br /> 1976. 108 <br />Figure 21. Seasonal change in total abundance of the major <br /> orders of aquatic insects of the White River., July <br /> 1975 to September 1976. .109 <br />viii <br />