Picoplankton refers to a size class of plankton that includes tiny, microscopic organisms typically ranging from 0.2 to 2 micrometers in size. This group primarily consists of photosynthetic and heterotrophic microorganisms, including certain types of bacteria, cyanobacteria, and small phytoplankton. Picoplankton plays a crucial role in marine and freshwater ecosystems as they are primary producers and contribute significantly to the aquatic food web.
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