Phytoplankton are the plant-like organisms of the sea that carry out photosynthesis

  PHYTOPLANKTON

  

WE CAN SEE THEM Phytoplankton are the plant-like

  • organisms of the sea that carry out photosynthesis

  microscopic single celled organisms or

  Ultraplankton < 2 m

  Plankton: Defnitions

  • Size classes

  

Phytoplankton

Pigments

  • Often used to categorize phytoplankton

    All photosynthetic algae possess photosynthetic

    pigments.
    • Chlorophylls - Chla in all algae; also b and c (absorb blue,

  Absorption spectra for diferent algal pigments

  Major Taxa of the Phytoplankton

  • Prokaryotes Blue-green algae (cyanobacteria) Other eubacteria (purple sulfur bacteria) 

  Cyanobacteria

  • • Includes many of the

    foaters (lagoon scum) picoplankton, and

  Cyanobacteria Diatoms (Bacillariophyta)

  • Have silica shells appear in

  Diatoms

  Diatom Skeletons (tests) Centric Pennate

  

Nitzschia pungens (domoic

acid) Caused amnesic self

  

Coccolithophores (Prymnesiophytes) Coccolithophorid bloom of Newfoundland

  Chlorophytes

  • Green in color (a and b)
  • Rare in the ocean (most in fresh

  Dinofagellates

  • Motile (2 fagellae), can have a test (cellulose- like)

  Dinofagellates

  

Pfesteria

Toxic dinofagellate

  

Paralyti Dinofagellate Red Tide

  Dinofagellate Symbionts

  • Many cnidaria

  (corals, anenomes)

  

Dinofagellates (Pyrrhophyta)

  Dinofagellates

  • Many distinct forms

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