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Last modified
7/14/2009 5:02:30 PM
Creation date
5/22/2009 12:54:35 PM
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UCREFRP
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
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<br />Dissolved oxygen levels were generally inversely related to water <br />temperatures, although dissolved oxygen exhibited a less consistent seasonal <br />trend. Average dissolved oxygen in the river decreased slightly downstream, <br />from 8.1 mg/L at Island Park to 7.4 mg/L at Ouray. In backwaters, average <br />dissolved oxygen was highest at 8.2 mg/L at Jensen, and lowest at 7.5 mg/L at <br />Ouray. pH was usually above 8.0. <br /> <br />Specific conductance increased downstream in the river and was generally <br />higher in backwaters than in the main river. Average specific conductance in <br />the main river in 1987 ranged from 659 ~S/cm at Island Park to 717 ~S/cm at <br />Ouray, while in 1988, specific conductance ranged from 731 ~S/cm at Island <br />Park to 772 ~S/cm at Ouray. In backwaters, average specific conductance <br />ranged from 685 ~S/cm at Jensen to 720 ~S/cm at Ouray, while in 1988, specific <br />conductance was highest at 1,154 ~S/cm in Jensen backwaters, and lowest at 772 <br />~S/cm in Ouray backwaters. High average specific conductance in Jensen <br />backwaters was due to the high values recorded in BA 300.5, during both the <br />regular 2 week sampling and with the continuous monitoring instrument. <br /> <br />Turbidity was greater in downstream backwaters but exhibited no consistent <br />seasonal pattern compared to the river. Turbidity averaged 37, 36, and 142 <br />NTU in the main river at Island Park, Jensen, and Ouray, respectively, in <br />1987, and 93, 61, and 49 NTU at these sites in 1988. In backwaters, average <br />seasonal turbidity was 32, 34, and 49 NTU at Island Park, Jensen, and Ouray, <br />respectively, while in 1988, turbidity averaged 27, 34, and 59 NTU at these <br />respective sites. <br /> <br />Slightly warmer water temperatures and greater nitrogen and phosphorus <br /> <br />3 <br />
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