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Multicellular Primary Producers

Multicellular Primary Producers. Seaweeds and Grass Ch. 6. Structure. Thallus: Complete body Blades: Leaf-like portions Pneumatocyst: Gas-filled bladders What’s the importance of these? Stipe Stemlike structure, support Holdfast: Attaches the thallus to the bottom.

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Multicellular Primary Producers

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  1. Multicellular Primary Producers Seaweeds and Grass Ch. 6

  2. Structure • Thallus: • Complete body • Blades: • Leaf-like portions • Pneumatocyst: • Gas-filled bladders • What’s the importance of these? • Stipe • Stemlike structure, support • Holdfast: • Attaches the thallus to the bottom

  3. Types of Seaweed: Green Algae • 10% of the 7,000 species of green algae are marine • It is thought that land plants evolved from green algae • Similar pigments and food reserve • Common on rocky shores and tidepools Galapagos Iguana

  4. Iguanas, Green Algae, and Sea Lions?

  5. Brown Algae Dead Man’s Fingers Rockweed • Color varies from olive to dark green • There are yellow-brown pigments, in addition to chlorophyll • Often exposed on low tides

  6. More Brown Alage: The Kelps

  7. Bull Kelp • Nereocystis • Up to 100 ft long • Large pneumatocyst at upper end • Filled with mixture of gasses, including CO2

  8. Giant Kelp • Macrocystis • Largest kelp—up to 330 ft! • Can grow 20 inches in one day!

  9. Giant Kelp

  10. Life in the Kelp Forest

  11. Red Algae • More species of red algae than green and brown combined • Shallow water, marine environments • Chlorophyll masked by red pigment (phycobilins) • Coralline algae shown with gooseneck barnacles

  12. Economic Importance of Kelp and Other Seaweeds • You tell me . . .

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