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Pfiesteria piscicida and Cryptoperidiniopsis spp. are common co-occurring heterotrophic dinoflagellates in estuaries along the Atlantic coast of the United States. We isolated P. piscicida, Cryptoperidiniopsis sp., and 2 benthic ciliates (Euplotes vannus and E. woodruffi) from North Inlet estuary, South Carolina, and examined the growth and graz- ing properties of the ciliates on cultures of the dinoflagellates maintained with cryptophyte (Storeatula major) prey. Ciliate growth and grazing parameters on cryptophyte monocultures and mixed diets of cryptophytes and P. piscicida were signifi- cantly higher with E. woodruffi than E. vannus. Also, the net grazing impact of E. woodruffi on P. piscicida prey was higher than the impact on Cryptoperidiniopsis sp., while the E. van- nus grazing effect did not differ with dinoflagellate prey. The results indicate the potential for effective predatory con- trol by euplotid ciliates on nontoxic P. piscicida and Crypto- peridiniopsis sp. under defined laboratory conditions.

Grazing of two euplotid ciliates on the heterotrophic dinoflagellates Pfiesteria piscicida and Cryptoperidiniopsis sp.