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Two naturally occurring dinoflagellates, the autotrophic Prorocentrum micans and the hcterotrophic Noctiluca scintilldns (non-bioluminescent), ,ind the green alga Dunaliella tertiolecta were tested as prey for the first zoeal stage of the brachyurdn crab C'ancer magister under controlled laboratol-y conditions. Each dinoflagellate was tested alone and In combination with a suboptimal application of the nauplius of the brine shrimp Artemla sp . , a diet of known value. When offered alone, both dinoflagellates delayed mortality as compared to an unfed control, but neither supported development to the second zoeal stage. When larvae were fed a cycle of 1 d of Artemia sp. nauplii, followed by 2 d of either dinoflagcllate, survival to zoeal stage 11 was significantly higher than for larvae fed 1 d of nauplii followed by 2 d unfed. Indeed, survival was equal to a control that had been fed nauplii cont~nuously, although thcre was a significant delay in time to molt. Larvae fed D. tertiolecta in combinatlon wlth nauplii sho\ved a rc,duction in survival ils comparerl to the suboptimal nauplius dlet alone and no difference in time to molt. All 3 protists were consumrd and thc 2 dinoflagcllates contnbuted nutritionally Given the susceptibility of newly hatched brachyuran larvae to starvation, their abillty to prey upon protlsts may be significant, especially for C. magister, a species that hatches in the Puget Sound (WA, USA) region in winter, a time of very low primary productivity. Crab larvae that can consume protistan prey may serve as a link between the rich carbon sources of the microbial food web and metazoans.

Nutritional role of protists in the diet of first stage larvae of the Dungeness crab Cancer magister