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Protist notes Protist notes Presentation Transcript

  • Kingdom Protista -Kingdom at the crossroads-
  • Classification
    • Free-living
    • Eukaryotic
    • unicellular, colonial forms
    • 3 types
      • Animal like
      • Plant like
      • Fungus like
      • Most easily classified by what they are NOT
      • Not animals, not plants, not fungi
  • Animal-like protists “Protozoans”
    • Unicellular & colonial
    • Eukaryotic
    • heterotrophic
    • Endosymbiont Hypothesis
      • First eukaryotic cell was formed by a symbiosis among several prokaryotes which lost the ability to live alone
  • Animal-like protists
      • Ciliates - motile, cilia, free living
        • Ex. Paramecium (reproduction by binary fission, conjugation)
      • b. Flagellates – motile, flagella, reproduce asexually by binary fission and sexually
      • Ex. Trypanosoma – causes African sleeping sickness
      • Ex. Trichonympha – live in termites, help digest food
      • c. Sporozoans – non motile, parasitic, reproduce by spores
      • Ex. Plasmodium – causes malaria
      • d. Sarcodina – “false feet” pseudopods
      • Ex. Ameba – some cause amebic dysentary
    • **Disease – infection caused by many of these**
  • Ameoba
  • Paramecium
  • Radiolarian
  • Plant-like protists
    • Single celled
    • Photosynthetic
    • Some are flagellated, luminescent
    • May live freely or as colonies
    • Phytoplankton – primary producers of oxygen
    • Euglenophyta - Euglena (autotrophic and heterotrophic)
    • Pyrrophyta – dinoflagellates (luminescent, produce toxins that shellfish absorb – dangerous = RED TIDE)
    • Chrysophyta – diatoms, important component of marine plankton – food source for marine animals, silicon cell walls important component of detergents, polishes, paint removers
  • Diatoms
  • Spyrogyra
  • Fungus-like protists
    • Contain parasitic and predatory molds that produce spores
    • Most are single-celled, decomposers in aquatic habitats
    • Phagocytic slime molds live as single amoeboid cells or aggregations of cells that migrate together and form spore producing structures
    • Acellular slime molds – help scientists study movement of protoplasm, form plasmodia at one point in life cycle
    • Cellular slime molds – help scientists study how cells communicate, function like a single, multicelled organism as one point in their life cycle
  • Slime mold
  • ALGAE Protists or Plants???
    • Red, Brown and Green Algae
    • Many scientists place them in Plant Kingdom