multicellular primary producers seaweeds and grass ch. 6
TRANSCRIPT
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Multicellular Primary ProducersSeaweeds and GrassCh. 6
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StructureThallus:Complete bodyBlades:Leaf-like portionsPneumatocyst:Gas-filled bladdersWhats the importance of these?StipeStemlike structure, supportHoldfast: Attaches the thallus to the bottom
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Types of Seaweed: Green Algae10% of the 7,000 species of green algae are marineIt is thought that land plants evolved from green algaeSimilar pigments and food reserveCommon on rocky shores and tidepools
Galapagos Iguana
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Iguanas, Green Algae, and Sea Lions?
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Brown AlgaeDead Mans FingersRockweedColor varies from olive to dark greenThere are yellow-brown pigments, in addition to chlorophyllOften exposed on low tides
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More Brown Alage: The Kelps
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Bull KelpNereocystisUp to 100 ft longLarge pneumatocyst at upper endFilled with mixture of gasses, including CO2
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Giant KelpMacrocystisLargest kelpup to 330 ft!Can grow 20 inches in one day!
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Giant Kelp
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Life in the Kelp Forest
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Red AlgaeMore species of red algae than green and brown combinedShallow water, marine environmentsChlorophyll masked by red pigment (phycobilins)Coralline algae shown with gooseneck barnacles
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Economic Importance of Kelp and Other SeaweedsYou tell me . . .
Blades are not technically leaves b/c they have no veins
Pneumatocysts keep blades close to surface maximizing exposure to sunlight*