Abstract
Experiments were performed in 100‐liter cages in which Daphnia pulex and larvae of the predatory dytiscid Acilius semisulcatus were enclosed. Results indicate that individual predators have feeding rate coefficients >20 liters·d−1 on all sizes of Daphnia combined and that the vertical distribution of Daphnia >1 mm long is significantly altered by the presence of this predator. Density of Acilius was determined in a small pond near Montreal, and simple calculations suggest that this macroinvertebrate predator, although occurring at a low density, may exert considerable influence on the numbers of Daphnia in the pond.
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