Aspects of this topic are discussed in the following places at Britannica.
...phytoplankton. While many dinoflagellates carry out photosynthesis, some also consume bacteria or algae. Other important groups of protists include flagellates, foraminiferans, radiolarians, acantharians, and ciliates (Figure 3). Many of these protists are important consumers and a food source for zooplankton.
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