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 FingersRockweed 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 CO 2

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...