Some species can also be mixotrophic. Picoplankton are responsible for the most primary productivity in oligotrophic gyres, and are distinguished from nanoplankton and microplankton. Because they are small, they have a greater surface to volume ratio, enabling them to obtain the scarce nutrients in these ecosystems. Note that the SI prefix pico- is used quite loosely here, as nanoplankton and microplankton are only 10 and 100 times larger, respectively.
See also 
- Alexander Vershinin. "Phytoplankton in the Black Sea". Russian Federal Children Center Orlyonok.
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