Multicellular: Primary Producers: Seaweeds and Plants

Multicellular: Primary Producers: Seaweeds and Plants

SEAWEED CHARACTERISTICS Multicellular Eukaryotic Cells Some 75% or more of the oxygen in the planets atmosphere is actually

produced by photosynthetic algae and cyanobacteria. CLASSIFICATION Generally consider members of the Protista kingdom

Some scientists want to reclassify them as plants especially green algae Genetic studies and biochemical similarity indicate a need for reclassification of green algae.

GENERAL STRUCTURE Thallus- body of seaweed Blade- leaf-like flattened portions Holdfast- root-like structure

that anchors thallus to substrate TYPES OF SEAWEED Three types of Multicellular Seaweed

1. Green (Chlorophyta) 2. Brown 3. Red Algae GREEN ALGAE

Sea Lettuce(ulva)& Dead Mans Finger (codium) BROWN ALGAE Rockweeds (Fucus) - found Temperate Shores

KELP FOREST - KELP FORESTS Macrocystis- largest of the kelps- up to 100 m (330 ft) have been found Kelp forests- very biological productive RED ALGAE

Irish Moss (Chrondrus) - North Atlantic Red Alga ECONOMIC IMPORTANCE Seaweeds are edible- especially red and brown

ECONOMIC IMPORTANCE CONT Agar- From Red Algae. Used in canned meats. Also, by Biologists to grow microorganisms.

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