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Last modified
7/14/2009 5:02:30 PM
Creation date
5/22/2009 12:54:35 PM
Metadata
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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 />laboratory for analysis. Chlorophyll ~ extraction and analysis was performed <br />according to methods outlined in Parsons and Strickland (1963). <br /> <br />Particulate organic material. - Organic material composed of living or dead <br />suspended particulate material is important to the ecosystem since it <br />represents a potential food source for aquatic fauna such as zooplankton or <br />larval fish. Two size-fractions (>25 pm and <25 pm) of inorganic and organic <br />suspended particulate material in the river and backwaters were determined as <br />follows; fifty liters of water were filtered through a 25 ~m pore-size net. <br />About 10 l of the filtrate passing through the 25-pm net was retained in a <br />clean container. The >25 pm fraction retained by the net was collected and <br />preserved with sufficient formalin to yield about a 2 percent solution for <br />subsequent laboratory analysis. From the 10 l of filtrate that passed through <br />the net (the <25 pm fraction), two replicate 500 to 1500 mL volumes were <br />vacuum-filtered through separate, preweighed, preashed Gelman AlE fiberglass <br />filters, and returned to the laboratory. These preweighed and numbered <br />filters were dried in an oven, weighed, ashed to burn off the organic portion <br />of the filtered material, and weighed to determine the percent of organic vs. <br />inorganic material. The same procedure was used to separate organic from <br />inorganic material in the >25 ~ size-fraction. <br /> <br />Phytoplankton and zooplankton. - Duplicate 25-L water samples were collected <br />and filtered through an 80 pm plankton net (in 1987) to determine abundance <br />and identity of net phytoplankton and zooplankton in both the main river and <br />backwaters. Samples were preserved in sufficient buffered formalin to yield a <br />5 percent concentration. In 1988, plankton samples were collected using a <br />25 pm plankton net. At selected sites, 1 liter of the <25 ~ filtrate was <br /> <br />21 <br />
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