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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 protist
What is a protist?

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





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