Abstract

The rate of collection by Bosmina of large and small food particles was measured with 14C‐labeled algae and checked by visual observation. Bosmina collected and ingested a large alga, Cosmarium, about six times faster than a small one, Chlorella. This is consistent with the observation of DeMott and Kerfoot that Bosmina has two modes of feeding: small‐particle filtering and large‐particle grasping.

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