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Several dinoagellate species in the genus Blastodinium are gut parasites of marine planktonic copepods. However,there is only limited information on the occurrence and infection frequencies of Blastodinium spp. in the eld andalmost no information on the functional impact on their hosts. We report upon the effects of Blastodinium sp. infectionon Calanus nmarchicus from the northeastern Atlantic coast off southern Norway during April 2013 and 2014. Up to58% of C. nmarchicus were infected near the coast, while ,5% were infected several kilometers offshore. Ingestionrates of infected females were below detection limits and signicantly lower than uninfected females. Blastodinium sp.-infected females showed characteristic symptoms of starvation, including lower respiration rates (implying a lowermetabolic rate), production of smaller and fewer fecal pellets and signicantly fewer eggs than uninfected females. Afew females in this study were able to void the infection, however the extended period of starvation is likely to havelonger-term repercussions on egg production rates well after the copepod clears the infection. The degree to whichthe infection affects C. nmarchicus recruitment depends on the extent of the spatial distribution of the infection.Monitoring of parasitic infection during routine eld surveys will be required in order to clarify this.KEYWORDS: zooplankton; secondary production; gut parasite; starvation; egg production; sterility; metabolism;ingestion; population dynamics; biogeochemical cycles

journal of plankton research

Infection of the planktonic copepod Calanus finmarchicus by the parasitic dinoflagellate, Blastodinium spp: effects on grazing, respiration, fecundity and fecal pellet production