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The abundance and biomass of ciliates and dinoflagellates in a nearshore area affected by freshwater runoff and coastal upwelling events were assessed during 7 campaigns distributed over winter and spring months between 2006 and 2008 in the Itata river plume and off Coliumo Bay in Central Chile (~36° S). Grazing rates were also established for both aloricate ciliate and naked dinoflagellate populations using data on instantaneous food vacuole content via the uptake of fluo- rescently labelled algae (FLA). Both dinoflagellates and ciliates were more abundant in the less saline waters of the river plume. The dominant micrograzers on FLA were the dinoflagellates Gyro- dinium spp. and Gymnodinium spp. and the ciliates Strombidium spp. Ingestion by naked dinoflagel- lates ranged from 0.06 to 0.14 prey d -1 , whereas aloricate ciliates ingested between 20 and 35 prey d -1 . Maximum carbon ingestion of naked dinoflagellates occurred during spring, whereas it peaked both in winter and in spring in aloricate ciliates. The highest grazing impact of ciliates on nanoplank- ton (~99% of primary production d -1 ) occurred during winter within the river plume. The higher abundance of small potential prey, as well as the resulting higher grazing impact of microzooplank- ton during winter in the river plume area, suggest an adequate environment for protozoan growth.

Grazing impact of natural populations of ciliates and dinoflagellates in a river-influenced continental shelf