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Domain Eukarya. Kingdom Protista. What is a protist ?. What is a protist ?. Weird things: has eukaryotic cells, so they aren’t bacteria or archaea doesn’t fit in with the fungi, plants, or animals either

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domain eukarya

Domain Eukarya

Kingdom Protista

what is a protist1
What is a protist?
  • Weird things:
    • has eukaryotic cells, so they aren’t bacteria or archaea
    • doesn’t fit in with the fungi, plants, or animals either
    • this kingdom is a ‘catch-all’ for things that we don’t fully understand their relationships to the rest of life
how do we group protists
How do we group protists?
  • Very diverse, so we tend to think of them as which other kingdom they are most like:
    • fungus-like
    • plant-like (algae and seaweeds)
    • animal-like (protozoans)
fungus like protists
Fungus-like protists
  • not classified as fungi for various reasons
    • have a stage in their life cycle where they are mobile
    • sometimes unicellular, sometimes multicellular
  • most reproduce using spores
fungus like p rotists
Fungus-like protists
  • Two main groups (thought there are more)
    • Slime molds
    • Water molds
  • Mostly heterotrophic decomposers
fungus like protists1
Fungus-like protists
  • Many water molds are parasitic and cause numerous plant diseases, among other things

Sudden Oak Death

plant like protists
Plant-like protists
  • probably the most familiar protists; include algae and seaweed
  • not classified as plants due to various reasons:
    • some are unicellular
    • some lack certain tissues that true plants have
    • must live in water
plant like protists1
Plant-like protists
  • use photosynthesis to obtain food
  • many different groups:
    • diatoms
    • euglena
    • green, red, brown, and golden-brown algae
plant like protists2
Plant-like protists
  • Uses:
    • Diatoms are used in forensics, nanotechnology, and agriculture
    • Seaweeds are an important source of food and have applications in green energy
animal like protists
Animal-like protists
  • again, not classified as animals for a variety of reasons:
    • mostly unicellular
  • mostly heterotrophs that live in water
animal like protists1
Animal-like protists
  • often grouped by how they move:
    • flagellates (move using a flagella)
    • ciliates (move by using cilia)
    • amoebas (move using pseudopodia)
  • there is an additional group that is entirely parasitic:
    • sporozoans

Giardialamblia

Plasmodium

Paramecium

Amoeba

animal like protists2
Animal-like protists
  • Relevance to people:
    • disease: giardiasis, malaria, Chagas disease
    • scientific research: Paramecium is used as a model organism in labs
    • ecological: many eat bacteria, helping keep their numbers in check
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