Collection of large and small food particles by Bosmina1

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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