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The rate of collection by Bosmina of large and small food particles was measured with $^14 C-labeled$ 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.
Limnology and Oceanography