Algae: Plantlike Protists

1
Algae Plantlike Protists

• Multicellular, photosynthetic protists
• NOT plants
• One or more kinds of chlorophyll
• Photosynthetic pigments
• phytoplankton

2
Six Phyla of Algae

• Euglenoids
• Diatoms
• Dinoflagellates
• Green algae
• Red algae
• Brown algae

3
Euglenoids

• Unicellular
• Like plants and animals
• No cellulose wall
• Contain chlorophyll and undergo photosynthesis
• Responsive and move
• Can ingest food

4
Diatoms

• Phylum Bacillariophyta
• Unicellular
• Shells made of silica
• Photosynthetic
• Classified by shape
• Radially symmetrical
• Elongated with distinct right and left sides

5
Reproduction of Diatoms

• Both asexual and sexual
• Reproduce asexually for several generations
  before sexual reproduction takes place

6
Carotenoids

• Daitoms contain chlorophyll as well as other
  pigments
• Carotenoids golden yellow color
• Food formed in the form of oil, not starch

7
Dinoflagellates

• Phylum Dinoflagellata
• Unicellular
• Cell walls made up of thick cellulose plates
• Great variety of shapes and sizes
• Two flagella
• Major component of ocean phytoplankton

8
Red Tides

• Contain chlorophyll, carotenoids and a red
  pigment
• Several species produce poisonous toxins
• Gonyaulax catanella lethal nerve toxin

9
Red Algae

• Phylum Rhodophyta
• Multicellular
• Marine tropical waters or along rocky coasts
• Red seaweed
• Phycobilins red and blue pigment
• Absorb green, violet and blue light waves

10
Brown Algae

• Phylum Phaeophyta
• Salt water along rocky coasts in cool areas
• Contain fucoxanthin
• Kelp largest and most complex
• Thallus simple plant or algae body w/o roots,
  stems or leaves

11
Green Algae

• Phylum chlorophyta
• Most diverse
• Most live in fresh water
• Reproduce both sexually and asexually
• Fragmentation
• Alteration of generations
• Gametophyte
• sporophyte