Abstract
An automatic plankton sampler was installed in the powerhouse of Gavins Point Dam to monitor plankton in discharges from Lewis and Clark Lake. These data and samples from the reservoir taken with tow nets indicated that the automatic sampler can be used exclusively to monitor changes in species compositions and densities of Copepoda and Cladocera.The annual discharge of Copepoda and Cladocera from Lewis and Clark Lake was estimated to be 12,619 metric tons, wet weight. Discharges of zooplankton from Lake Francis Case (Ft. Randall Reservoir), 80 km upstream, appear to have considerably more influence upon standing crops in Lewis and Clark Lake than the water exchange rates or the inflow from tributary creeks.
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