Return to Marine Biololgy

Chapter 5

Bacteria/Cyanobacteria (blue-green algae)
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Unicellular Algae
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Protozoans (unicellular and animal-like)



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Rotifers - (very small animals/not a protist) are multicellular animals less than 1000 cells
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Seaweeds or Multicellular Algae or Macrophytes
  • are protists, not plants
  • have spores instead of seeds
  • don't have flowers
  • lack true leaves, stems, and roots of the higher plants
Structure:external image seaweedstruct.jpg
  • complete body – thallus
  • leaf-like flattened portions – blades
  • stem-like structures – stipe
  • structures that look like roots – holdfast
  • gas filled bladders - pneumatocycts

Classifications of Algae:
Based on the different types of Chlorophyll

Green Algae:
  • Sea lettuce and dead man's fingers
  • has the same type of chlorophyll as true plants
  • have cellulose cell walls
  • few marine species, but these can be abundant

Brown Algae:
  • kelps and rockweeds
  • green and brown chlorophylls
  • biggest and most complex
  • found in the Sargasso Sea
  • source of algin an emulsifier

Red Algae:
  • Irish moss and porphyra (nori)
  • red pigment (phycobilins) mask color of chlorophyll
  • live the deepest
  • largest group
  • some help in coral building
  • source of agar and carrageenan, both of which are emulsifiers