Protists - eukaryotes - diverse Complex single cells Simple - - PowerPoint PPT Presentation

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Protists - eukaryotes - diverse Complex single cells Simple - - PowerPoint PPT Presentation

Mar 06, 2023 118 likes •315 views

Protists - eukaryotes - diverse Complex single cells Simple multicellulars - not a true clade 3 types (by nutrition) Like animals: Protozoa Like plants: Algae Like fungi: slime molds, water molds, downy mildews Protozoa by

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SLIDE 1

Protists

  • eukaryotes
  • diverse

Complex single cells Simple multicellulars

  • not a true clade
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SLIDE 2

3 types (by nutrition)

  • Like animals: Protozoa
  • Like plants: Algae
  • Like fungi: slime molds, water molds, downy

mildews

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SLIDE 3

Protozoa – by movement

  • Flagellates
  • Amoeboids (with pseudopods)
  • Ciliates
  • Apicomplexans
  • http://www.youtube.com/watch?v=QGAm6hMysTA
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SLIDE 4

Protozoa – Flagellates

  • Mostly free-living
  • Some parasites cause human diseases

(Giardia, Trypanosoma)

  • Symbiont (Trichonympha) lives in termites,

digests wood

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SLIDE 5

Protozoa – Amoebas

https://www.google.com/search?q=amoeba%20eng

  • http://www.youtube.com/watch?

v=7pR7TNzJ_pA c

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SLIDE 6

Protozoa – Ciliates

  • Paramecium
  • http://www.youtube.com/watch?v=fh_yjLppNAg
  • Rotifers
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SLIDE 7

Protozoa – Ciliates - Rotifers

  • “wheel-carriers”
  • Their own phylum' about

2200 known species

  • Multi-cellular

(about 1000 cells)

  • Eat detritus
  • Some species are females-only
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SLIDE 8

Protozoa – Apicomplexans

  • Unmoving
  • Parasites
  • Complicated life cycles using 2 or more hosts
  • Malaria: Plasmodium vivax
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SLIDE 9

Fungus-like protists

  • Slime molds:
  • Plasmodial
  • cellular
  • Water molds
  • Downy mildews
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SLIDE 10

Plasmodial slime molds

  • Decomposers; moist forest environments
  • Plasmodium is a super-cell: many nuclei, no

cell walls or membranes

  • Form spores when food, water run out
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SLIDE 11

Cellular slime molds

  • Decomposers; moist forest environments
  • Complex life cycle: individual – colony – spore
  • Coordinated behavior
  • http://www.youtube.com/watch?

v=CIEggUBoivY

  • http://www.youtube.com/watch?v=bkVhLJLG7ug
  • http://www.youtube.com/watch?

v=leKI3Cv9YYw

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SLIDE 12

Water molds

  • Most decompose dead plants in freshwater
  • Some parasites of fish
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SLIDE 13

Downy mildew

  • Grow on plants (grapes, vine vegetables)
  • Potatoes: Phytophthora infestans
  • Irish potato famine: 1 million deaths
  • 1.5 million emigrations
  • Thousands lost land
  • Political revolt: Irish independence
  • Ireland is still low population
  • Significant impact on American population
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SLIDE 14

Algae

  • Microscopic: Euglenoids, Dinoflagellates, diatoms
  • http://www.youtube.com/watch?v=ZHZZKwrYm4g
  • Photos are dinoflagellates
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SLIDE 15

Algae

  • Dinoflagellates: cellulose wall (like plants)
  • Red tides
  • Diatoms – glassy shells which fossilize
  • “Diatomaceous earth” used

for filtering, polishing, as a pesticide

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SLIDE 16

Algae: Seaweeds

  • Not a clade
  • Entirely aquatic
  • Marine and freshwater
  • Have structures similar to plants but much less

complex

  • Many edible, used in ice cream, milkshakes...

(carrageenan)

  • Classified by color: Brown, red, green
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SLIDE 17

Algae: Seaweeds

  • Brown – not all are really brown
  • most notable is kelp
  • Red – include coralline algae
  • Can grow deepest in ocean
  • Sea hares eat and can squirt red
  • http://www.marinelifephotography.com/marine/seawee

ds/seaweeds.htm

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SLIDE 18

Algae: Seaweeds

  • Green – closest to land plants
  • Single or multi-cells
  • Complex life cycles
  • We saw several kinds in

pond water