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Definition: The plant members of the plankton community, which are the primary producers of the oceans. Phytoplankton include taxonomic groups such as the cyanobacteria, diatoms, dinoflagellates, and many more.
Source: Invitation to Oceanography 5th ed. Pinet, Paul. R.
Example: Phytoplankton require both macronutrients such as nitrogen and phosphorus and micronutrients such as iron, copper, manganese, zinc, and copper.