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For decades, high densities of the dinoflagellate Karlodinium veneficum have been associated with aquatic faunal mortalities worldwide. This small (<8–12μm) athecate phytoplankton, common in coastal aquatic ecosystems, has a mixed nutritional mode, relying on both photosynthesis and phagotrophy for growth (mixotrophy). It is frequently present in relatively low cell abundance (10 2 –10...
The parasitic dinoflagellate Amoebophrya sp. ex Karlodinium veneficum was used to test two hypotheses: (1) infection of cells decreases with increasing host toxicity and (2) parasitism causes the catabolism of host toxin. To test the first hypothesis, host strains differing in toxin content were inoculated with dinospores of Amoebophrya sp. derived from infected cultures of toxic and non-toxic K....
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