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Kingdom ProtistaChapter 25
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Characterisitics of Protists
• Eukaryotic • Don’t fit into any other
kingdom • Most diverse group • Animal-like, plant-like or
fungus-like • Some one cell, some
multicellular • Some autotrophs, some
heterotrophs • Most reproduce asexually
but some thru conjugation
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Animal-Like Protists: Phylum Protozoa
• Heterotrophs • Prey on smaller cells –
protists, bacteria and food particles
• Cytoplasm moves and forms pseudopodia –that function in ameoboid movement and feeding
• Subphyla Sarcodina and Mycetozoa
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Sarcodine feeding - amoeba
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Radiolaria: silicon dioxide tests
Foraminifera:
Calcium carbonate tests (outer shell)
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White Cliffs of Dover: remains of foraminiferans
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Animal-Like Protists: Phylum Ciliophora
• Have cilia – movement !• Genus Paramecium
common ciliate !– Pellicle – protein layer
around cell membrane – Oral groove – contains
cilia that move food toward mouth pore
– Gullet – forms food vacuoles
– Contractile vacuoles- expand and contract to collect and expel water
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Plant-like Protists• Algae • Autotrophic – photosynthetic • Why not plants? No true roots, stems or leaves • Most are aquatic • Unicellular = Phytoplankton
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Phytoplankton
• Base of food web • Oxygen in
atmosphere !!!
• But there can be too much of a good thing….
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Too much phytoplankton
• HABs – harmful algal blooms • Dead Zones
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Phyla of Plantlike Protists
• Chlorophyta – green algae • Phaeophyta – brown algae • Rhodophyta – red algae • Bacillariophpyta – diatoms • Dinoflagellata – dinoflagellates • Chrysophyta – golden algae • Euglenophyta - euglenoids
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Phylum Chlorophyta: Green• chl a and b, carotenoids • Most aquatic • Some live symbiotically
with fungi = lichen • Some live symbiotically
with coral
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Calcareous Green Algae: Halimeda and Penicillus
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Phylum Phaeophyta: Brown
• Chl a and c and fucoxanthin (brown) • Many multicellular • Giant Kelp • Sargassum
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Phylum Rhodophyta: Red
• Chl a and phycobilins • Can live deeper –
pigments can absorb light at deep wavelengths
• Most are seaweeds • Many are coralline –
calcium carbonate “crust”
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Phylum Bacillariophyta: Diatoms
• Unicellular • Two shapes: centric
and pennate • Two pieces – valves – fit
together like petri dish • Diatomaceous earth –
filters, toothpaste, abrasives
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Phylum Dinoflagellata• HABs • Usually unicellular • Many bioluminesce – production of light by
chemical reaction • Ex: Noctiluca
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Phylum Chrysophyta: Golden• Most freshwater, some marine • Store extra energy as oil • Formed petroleum deposits
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Phylum Euglenophyta: Euglenoids
• Plant-like or Animal-like?
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Phylum Euglenophyta: Euglenoids
• Chl a, b, carotenoids • Abundant in freshwater • No cell wall • Usually photosynthetic but
if grown in dark, never form chloroplasts
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Fungus-Like Protists: Slime Molds and Water Molds
• heterotrophic • found on moist decaying matter
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Plasmoidal Slime Molds
• plasmodium - mass of cytoplasm as large as several meters
• creeps along eating decaying leaves and debris • if water or food is scarce - reproduces - by
spores which can tolerate harsh conditions
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Cellular Slime Molds: “social amoeba”• live as individual haploid cells that move like
amoebas • when food or water is scarce, they send out a
chemical signal that causes cells to gather by the thousands into a pseudoplasodium that looks like a slug
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Water Molds
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Disease Caused By Protists
• Malaria - from Plasmodium -(phylum Apicomplexa) - mosquito is vector - when mosquito bites, spores enter bloodstream
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Amebiasis• spread by contaminated water or food; common
in developing countries; severe diarrhea, fever, intestinal bleeding !
• caused by Protozoa
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Giardiasis
• Giardia lamblia - flagellated Protozoan
• animal feces in water • not fatal • boil, filter water
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Toxoplasmosis
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Toxoplasma protozoa