Investigation of Water Quality and Plankton in Selected Aquatic Habitats on the Lower Mississippi river.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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The main channel was characterized by high current velocities, high suspended solids, low light penetration, relatively high nutrient concentrations, generally low chlorophyll and zooplankton concentrations, stable and slightly alkaline pH levels, and stable oxygen saturation approx. 90 percent. Detrital particulate organic matter POM comprised over 80 percent of the total POM for all sampling periods except August when algal POM comprised over half the total. The abandoned channel was characterized by quiescent, generally stratified eutrophic waters low in suspended solids and high in chlorophyll and zooplankton concentrations with moderately fluctuating pH levels and widely fluctuating oxygen saturation levels. Water quality and planktoon conditions observed in the secondary channel were indistinguishable from the main channel during periods of flow. During quiescent periods, suspended solids and turbidity decreased although other variables showed no appreciable difference from the main channel. Dike fields were transient lentic environments. During lotic periods, water quality was indistinguishable from the main channel. During isolations from the main channel, water clarity increased, soluble nutrients decreased, chlorophyll and zooplankton concentrations increased, and high pH and oxygen saturation levels were often observed. During the long period of isolation from the main channel, the dike fields became increasingly different from the main channel and from one another.
- Hydrology, Limnology and Potamology