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Last modified
7/14/2009 5:02:33 PM
Creation date
5/20/2009 10:50:49 AM
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UCREFRP
UCREFRP Catalog Number
8132
Author
Lieberman, D. and T. Burke.
Title
Limnology and Drift of Particulate Organic Matter Through the Lower Colorado River.
USFW Year
1991.
USFW - Doc Type
Denver, CO.
Copyright Material
NO
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Table 13.-F-test results based on ANOVA <br />between all sampling stations and total <br />dry weight (DW), and total POM for <br />phase 1 (Oct. 1986 through June 1987). <br />Mean Station Tukey <br />g/m3 grouping <br />Total dry weight, DW <br />43.82 Yuma q* <br />28.76 Imperial Dam B <br />18.55 Cibola B <br />6.05 Palo Verde Diversion Dam C <br />3.21 Headgate Rock Dam C <br />2.68 Park Moabi C <br />2.25 Parker Dam C <br />1.31 Davis Dam C <br />Total POM <br />3.14 Yuma q <br />2.15 Imperial Dam q <br />1.88 Cibola q <br />0.99 Palo Verde Diversion Dam B <br />.89 Parker Dam B <br />.80 Davis Dam B <br />.77 Park Moabi B <br />.75 Headgate Rock Dam B <br />* Means with the same grouping are not signif- <br />icantly different at the 0.05 confidence level. <br />Table 14.-Comparison of total mean annual POM between the lower <br />Colorado River and 6 and 7 order Western United States streams. <br />River location POM, g/m3 Reference <br />Range Mean <br />McKenzie River, 0.6-0.9 0.7 Naiman and Sedell (1979) <br />Oregon /n: Webster, Benfield, <br /> and Cairns, (1979) <br />Salmon River, 0.5-2.0 1.2 Sedell et al., (1978) <br />Idaho /n: Webster, Benfield, <br /> and Cairns, (1979) <br />South Platte River, 0.8-5.7 - - Ward, (1975) <br />Colorado /n: Webster, Benfield, <br /> and Cairns, (1979) <br />Brazos River, 2.8-11.0 7.2 Malcom and Durum, (1976) <br />Texas /n: Webster, Benfield, <br /> and Cairns, (1979) <br />Lower Colorado River <br />Overall, Phase 1 0.3-4.8 1.4 This report <br />Reservoir tailwaters 0.5-1.4 0.8 This report <br />Information other than this report gleaned /n: Webster, Benfield, and Cairns <br />(1979) [20]. <br />Average composition, in percent, at all stations for <br />the >25-µm size-fraction was: <br />- diatoms ........ 47 <br />- green algae ..... 28 <br />- other algae ..... 9 <br />- plant material ... 15 <br />- zooplankton ..... 1 <br />The distributions of these categories varied greatly <br />between stations as denoted in the table below. <br />Diatoms dominated the >25-µm POM for the three <br />upstream stations; the average was 74 percent of <br />the total composition at Davis Dam, Park Moabi, and <br />Parker Dam. This reflects the contributions from Lake <br />Mohave and Lake Havasu to the river (providing <br />pelagic/planktonic diatoms) and is supported by the <br />fact that zooplankton composition comprised 1 <br />percent or greater of the >25-µm POM only from <br />Davis Dam to Parker Dam. Green and blue-green <br />algae were the most common algae found in samples <br />from Headgate Rock Dam downstream to Cibola; this <br />possibly reflects autochonous production stimulated <br />by higher water temperatures or allocthonous <br />contributions from backwaters and/or agricultural <br />drains. The average amount of plant material (e.g., <br />macrophyte fragments) for the >25-µm size-fraction <br />POM was only 15 percent, but this average includes <br />eight stations. At the lower stations plant material <br />comprised almost 50 percent of the >25-µm size- <br />fraction (57 percent at Imperial Dam and 41 percent <br />at Yuma). This appears to be due to the large amount <br />of macrophytes and emergent vegetation throughout <br />the Imperial Division. <br />Average composition, in percent, at all stations for <br />the >505-µm size-fraction was: <br />- diatoms ........ 26 <br />- green algae ..... 39 <br />- other algae ..... 12 <br />- plant material ... 22 <br />- zooplankon ..... 1 <br />Percent mean composition of >25-µm size-fraction POM <br />Composition Davis <br />Dam Park <br />Moabi Parker <br />Dam Headgate <br />Rock Dam Palo Verde <br />Diversion Dam Cibola Imperial <br />Dam Yuma <br /> Mean, percent <br />Diatoms 76 66 81 38 45 37 12 17 <br />Green Algae 10 19 8 38 36 48 22 39 <br />Blue-green algae 9 11 - 18 18 - 9 3 <br />Other algae 2 2 10 - - - - - <br />Plant material 1 1 6 1 15 57 41 <br />Zooplankton 2 1 1 - - - - _ <br />* Denotes less than 1 percent <br />15
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