7394

• UCREFRP Catalog Number: 7394
• Author: Grabowski, S. J. and S. D. Hiebert.
• Title: Some Aspects of Trophic Interactions in Selected Backwaters and the Main Channel of the Green River, Utah 1987 - 1988.
• USFW Year: 1989.
• USFW - Doc Type: Denver, Colorado.
• Copyright Material: NO

Figure 18. - Average 1988 phytoplankton concentrations from
the main river and backwaters at Island Park,
Jensen, and Ouray. Numbers under bars indicate
river index of backwater. . . . .. .... 54

Figure 19. - Average zooplankton per liter for the main
river and backwaters at Island Park, Jensen,
and Ouray, during the 1987 sampling season. 59

Figure 20. - 1988 average concentrations of major
zooplankton groups for the main river and
backwaters at Island Park, Jensen, and Ouray. 59

Figure 21. - Average number per m2 of benthic
macroinvertebrates for the main river and
backwaters at Island Park, Jensen, and Ouray
for 1987. . . . . . . . . . . . 67

Figure 22. - Average number per m2 of benthic
macroinvertebrates for the main river and
backwaters at Island Park, Jensen, and Ouray
for 1988. . . . . . . . . . . . . . . . . . 67

Figure 23. - Average dry weights, g/m2, for chironomid
larvae, oligochaetes, ceratopogonid larvae,
and total benthos for the main river and
backwaters at Island Park, Jensen, and Ouray
for 1987. . . . . . . . . . . . . . . . . . 69

Figure 24. - Average dry weights, g/m2, for chironomid
larvae, oligochaetes, ceratopogonid larvae,
and total benthos for the main river and
backwaters at Island Park, Jensen, and Ouray
for 1988. . . . . . . . . . . . . . . . . . 69

Figure 25. - Diel cycle of water temperature (C), dissolved
oxygen (mg/L), and pH in BA 251.0 at Ouray for
August 1-2, 1987. . . . . . . . . . . . . . . 105

Figure 26. - Hourly river and backwater water temperatures
and backwater depths in Ouray BA 251.0 from
September 22 to October 3, 1988 . . . . . . . 109

v