Mississippi River Nutrient Impairment Study


The study will measure metaphyton (floating mats of algae) and duckweed biomass and associated water quality variables in backwater and impounded reaches of the Mississippi River, primarily in the Pools 5 to 9. Of particular interest is documenting water quality standard exceedances (low DO or high pH) and their association with dense growths of metaphyton and duckweeds. Water chemistry and plant tissue analysis will be conducted to evaluate the development of these plant communities under varying nutrient concentrations and to help determine nutrient limited conditions. This work will also evaluate USGS-LTRMP stratified random sampling water quality and vegetation data as another means for identifying water quality impairments associated with phytoplankton (sestonic chlorophyll a) or excessive metaphyton or duckweeds. This information will be useful for quantifying nutrient impairment problems on the Mississippi River and may also provide information for establishing nutrient criteria.To evaluate water quality impairments associated with the development of nuisance algae and duckweed growth in impounded and backwater areas of the Upper Mississippi River. An abstract and presentation of this work was make in St. Louis last October. http://www.epa.gov/msbasin/taskforce/nutrient_workshop/pdf/session-c2_2.pdf

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http://www.epa.gov/msbasin/ http://www.epa.gov/msbasin/taskforce/index.htm
Filamentous Algae Photo 2
Sampling Surface Vegetation, Mississippi main channel border in Pool 9 near Lynxville, WI.