The dominant phytoplankton in the open ocean are members of the picoplankton.

Name: The dominant phytoplankton in the open ocean are members of the picoplankton.
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Several studies have shown that picoplankton, specifically Prochlorococcus and Synechococcus, are the most abundant and dominant phytoplankton in the open ocean. These tiny microorganisms are responsible for a significant amount of primary productivity and play a crucial role in marine food webs and biogeochemical cycles.

The Dominant Phytoplankton in the Open Ocean Are Members of the Picoplankton