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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were preserved in sufficient buffered formalin to yield a 5 percent
concentration.

Samples for benthic invertebrates were collected with an 0.0232 m2
(15 x 15 cm) Ekman sampler and screened in a 600 ~m mesh littoral bucket.
Duplicate samples were collected in the main river and in each backwater
sampled. Samples were preserved for subsequent laboratory identification
and enumeration with sufficient buffered formalin to yield a final
concentration of 5-10 percent.

Mapping of backwaters was undertaken to determine their size and if
possible to relate size to limnological characteristics and attributes
of these backwaters. Length of the backwater was measured. Two to
five transects were then established to determine width, and depth
was measured at several points along the transect. This information
was used to estimate area and volume of backwaters. Continuous recording
of temperature, dissolved oxygen, pH, and specific conductance in one
backwater per location was done with a calibrated multiparameter data-recording
probe set to record every 60 minutes. The data collected were later
dumped to a computer in the laboratory for analysis.

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