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Last modified
7/14/2009 5:02:32 PM
Creation date
5/17/2009 11:32:34 PM
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UCREFRP
UCREFRP Catalog Number
8067
Author
Nance, E. L.
Title
Planktonic and Benthic Invertebrate Densities in Three Backwater Habitats on the Lower Green River Final Report.
USFW Year
1997.
USFW - Doc Type
Grand Junction, CO.
Copyright Material
NO
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<br />100% <br />900k <br />80% <br />70% <br />60% <br />50% <br />40% <br />30% <br />200k <br />10% <br />0% <br /> <br /> <br />II Other <br /> <br />o Copepoda <br />. Rotifera <br />. Nematoda <br /> <br />1-May 8-May 15-May 22-May 29-May 5..Jun 12..Jun <br /> <br />Figure 6: Percent composition of dominant benthic zooplankton in Holeman Canyon. <br /> <br />Nematodes were by far the dominant taxon in all benthic samples at all sites. They <br />comprised over 60% of all samples in Millard, 70% of all samples in Anderson, and 80% <br />of all samples in Holeman. Rotifers were the only other taxon present in large numbers. <br />They peaked at 32% of the average core samples on 1 May in Millard, decreasing steadily <br />to 5% of the samples at the end of May, and rising again to comprise 17% of the average <br />samples by mid June. The trend in rotifer populations was similar in Anderson though <br />benthic densities never rose above 13% in Holeman. Copepod populations were low at <br />all sites and on all sample dates. They peaked slightly to comprise 12% of the average <br />samples on the 29 May and 12 June in Millard canyon, otherwise, they comprised 1-2% <br />of the average of the five core samples at all sites and on all sample dates. <br /> <br />Nighttime Plankton Samples <br /> <br />The average nighttime density of zooplankton in Anderson Bottom was virtually the same <br />as that during the day. Nighttime density remained low (3-8 organisms per liter) <br />throughout the first four weeks of nighttime sampling, and then reached a peak of 20 <br />organisms per liter on the 12 June sample (Table 3). The percent dominant taxa were <br />also similar to that of the daytime tows, with copepod nauplii comprising the largest <br />percentages (Figure 7). These ranged from a low of 27% on the 14 May sample, to a high <br />of 67% on the 11 Jun sample. <br /> <br />10 <br />
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