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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
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<br />organism in Holeman during the last four sample weeks, averaging 40% of the average of <br />five tows. They occurred in 24%, 15% and 24% of the average of five tows during the <br />first three sample weeks <br /> <br />Benthos <br /> <br />Average invertebrate densities ranged from a low of 6.52 organisms/cm2 (65,200/m2) on <br />the first sample date in Millard to a high of56.22 organisms/cm2 (562,200/m2) on the <br />final sampling date in Holeman (Table 2). The average total densities showed little <br />variation within and between the three backwater sites after the first week of sampling. <br /> <br />SAMPLE DATE MILLARD ANDERSON HOLEMAN <br />01 MAY 6.52 + 1.86 7.18 + 4.75 16.30 :t 7.42 <br />08 MAY 19.18:t 7.03 17.71 :t 14.31 28.59 :t 11.24 <br />15 MAY 26.67 + 18.31 19.04 + 12.65 49.55:t 11.01 <br />22 MAY 47.11:t 12.56 24.52:t 7.10 48.30:t 38.26 <br />29 MAY 14.45 + 5.12 34.07 :t 17.66 51.19:t 41.53 <br />05 JUN 52.00 :t 24.50 30.67 :t 9.22 23.41 :t 8.64 <br />12 JUN 27.11 :t 8.32 38.59 :t 16.73 56.22 :t 26.48 <br />10 JUL 31.36:t 25.99 <br /> <br />Table 2: Average benthic zooplankton densities (organisms/cm2 I SD) from five core <br />samples. <br /> <br />The percent of qominant food items in samples by taxon, site and date are depicted in <br />Figures 4-6. The Copepod category is represented by all three life stages: adult, <br />copepodid and nauplius. Minor taxa, ('Other'), while diverse, comprised an average of <br />only 3% of the total core samples in Millard and Holeman. They include representatives <br />from Chironomidae, Oligochaeta, Ostrocoda, Cladocera, Ceratopogonidae, Tardigrada, <br />Plecoptera, Hydracarina and Simuliidae. Minor taxa in Anderson were represented by <br />slightly higher percentages, with a high of 11 % on the 22 May sample. <br /> <br />8 <br />
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