ProtistsProtists

““Junk Drawer”Junk Drawer”

Kingdom Protista has 11 very diverse phylaKingdom Protista has 11 very diverse phyla Phyla vary in shape, size, structure, Phyla vary in shape, size, structure,

complexity, feeding habits, locomotion, and complexity, feeding habits, locomotion, and reproductionreproduction

Also great ecological diversity – occupy Also great ecological diversity – occupy almost every known niche and habitatalmost every known niche and habitat

““Groups”Groups”

3 distinct groups in Protista3 distinct groups in Protista Animal-like Protists (4 phyla)Animal-like Protists (4 phyla) Plantlike Protists (6 phyla)Plantlike Protists (6 phyla) Fungilike Protists (1 phyla)Fungilike Protists (1 phyla)

What do they have in common?What do they have in common?

Most are unicellularMost are unicellular Cells are all eukaryoticCells are all eukaryotic Cells reproduce asexually by binary fissionCells reproduce asexually by binary fission

Some exchange DNA sexuallySome exchange DNA sexually Cells thrive in moist surroundingsCells thrive in moist surroundings

Freshwater, saltwater, animal fluids, damp Freshwater, saltwater, animal fluids, damp terrestrial environmentsterrestrial environments

Plantlike ProtistsPlantlike Protists

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AlgaeAlgae

Green, brown and red algae are plantlikeGreen, brown and red algae are plantlike multicellular; but multicellular; but do not form tissuesdo not form tissues

• This is how they are different from higher plantsThis is how they are different from higher plants

Extremely well adapted to wet environmentsExtremely well adapted to wet environments ““aquatic organisms”aquatic organisms”

• Also found on rocks, tree trunksAlso found on rocks, tree trunks

SeaweedSeaweed

Red and brown algaeRed and brown algae Large, multicellular Large, multicellular

oceanic plantsoceanic plants

Unicellular green algaeUnicellular green algae ‘‘phytoplankton’phytoplankton’ Float near water surface in Float near water surface in

both salt & fresh waterboth salt & fresh water

Importance of AlgaeImportance of Algae

Huge role in global environmentHuge role in global environment Primary food producers in aquatic food chainPrimary food producers in aquatic food chain Supply 80% of global oxygenSupply 80% of global oxygen

Human wastes / industrial waste is huge Human wastes / industrial waste is huge concernconcern Algal populations decreasing, mainly in Algal populations decreasing, mainly in

oceansoceans

Human Use of AlgaeHuman Use of Algae

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