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Swimming and Buoyancy
Some phytoplankton actively change their position in the water column
  • This process is called vertical migration
  • Dinoflagellates and larger flagellates: migrate towards deeper water during night to assimilate nutrients and ascent in the morning for photosynthesis during daylight

  • Cyanobacteria: can adjust their position in the water column by gas vesicles. These are laterally-connected cylindrical tubes of protein lacking any membrane