7103

• UCREFRP Catalog Number: 7103
• Author: Grabowski, S. J. and S. D. Hiebert.
• Title: Green River Trophic Dynamics Study 1987
• USFW Year: 1988.
• USFW - Doc Type: Draft.
• Copyright Material: NO

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CONTENTS--Continued

Table 12.--Number of phytoplankton taxa from the main river and backwaters
. at Island Park, Jensen and Ouray, from June 2 to November 19, 1987

Table 13.--Zooplankton taxa collected from the Green River, Utah,
from June 2 to November 19, 1987

Table 14.--Benthic invertebrates collected in the Green River and selected
backwaters from Island Park, Jensen, and Ouray in 1987

Table 15.--Percent occurrence of chironomid larvae, oligochaetes and
ceratopogonids at main river and backwater sites in Green River, Utah,
from June 2 to November 17, 1987

Table 16.--Average number/m2 for chironomid larvae, oligochaetes, ceratopogonids,
and total benthos for three Green River sites and eight backwaters
for the sampling season June 4 to November 19, 1987

Table 17--Average dry weights in grams/m2 for chironomid larvae, oligochaetes,
ceratopogonids, and total benthos for three Green River sites and
eight backwaters from June 2 to November 19, 1987

Table 18.--Food items encountered and percent frequency of occurrence
of these food items in stomachs of juvenile Colorado squawfish collected
from backwaters at Island Park, Jensen and Ouray during the 1987
sampling season

Table 19.--Stomach content information of juvenile Colorado squawfish
by backwater and date

Table 20.--Food items and percent frequency of occurrence from Gila
stomachs collected in 1987 from Green River backwaters

Table 21.--Average percent frequency of occurrence of major food items
in stomachs of several fish speicies collected in Green River backwaters,
1987

FIGURES

Figure 1.--Green River, Colorado-Utah. Sampling locations.
IP-Island Park, IN-Jensen, and OU-Ouray.

Figure 2.--Average daily flows in the Green River from June to November 1987.
Highlighted segments of the hydrograph indicate sampling periods.

Figure 3.--Water temperature, oC, for main river sites at Island Park,
Jensen and Ouray.

Figure 4.--Dissolved oxygen, mg/L, for main river sites at Island Park,
Jensen and Ouray.