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Digestion of ciliate prey (Pleuronema sp. and Metanophrys sp.) in Euplotes woodruffi was examined in laboratory experiments. Similar exponential declines in recognizable food vacuole contents were found in feeding and nonfeeding cells. Ingestion rates, based on digestion rates and food vacuole contents, yielded estimates of 0.4-1.6 Pleuronema and 3.7-4.2 Metanophrys consumed per E. woodruffi $h^-1$ at $20^\circC$, in agreement with rates obtained by other methods. Cells starved for 24 h showed faster digestion rates; temperatures variation over range of $15\^circ-25!circC$ gave a $Q_10$ of $\thicksim 1.5$.
Limnology and Oceanography