Filter Rates as a Measurement of Feeding Behavior in Daphnia Pulicharia
Taylor, John S.
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Daphnia pulicharia were placed in bottles containing Lake Michigan water and grazed on the natural populations of bacteria for one hour. Filtering rates were obtained using the Acridine Orange Direct Count Method. Filtering rates ranged from ca. 1.00 - 3.00 (ml • animal-1 • hour-1). Mixed populations of Chlamydomonas and lake bacteria were fed to the Daphnia to test selectivity in foods. Filtering rates indicate the animals. feed on the algae and bacteria equally well. Daphnia feeding on diatoms were thought to break up the large particles and ingest the fragments.