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Protists

Domain Bacteria. Domain Archaea. Domain Eukarya. Common ancestor. Protists. Domain Eukarya. General characteristics. Classification criteria eukaryotes not animal, plant or fungi. Great Diversity. brown algae & diatoms. dinoflagellates & ciliates. green algae. euglenoids.

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Protists

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  1. Domain Bacteria Domain Archaea Domain Eukarya Common ancestor Protists Domain Eukarya

  2. General characteristics • Classification criteria • eukaryotes • not animal, plant or fungi

  3. Great Diversity brown algae& diatoms dinoflagellates & ciliates green algae euglenoids red algae miscellaneous?

  4. Streptophyta (includes land plants) Choanoflagellida Archaea Chlorophyta Animals Bacteria Stramenopila Euglenozoa Fungi Alveolata Rhodophyta Problems with Protist Classification • Too Diverse!

  5. Paramecium & symbiont Chlorella Theory of Endosymbiosis mitochondrion internal membrane system aerobic bacterium Eukaryotic cell with mitochondrion Ancestral eukaryotic cell photosyntheticbacterium chloroplast Eukaryotic cell with chloroplasts

  6. Protist Diversity • The full spectrum of modes of life • from unicellular to multicellular • autotrophic to heterotrophic • asexual to sexual reproduction • pathogenic to beneficial • sessile to mobile

  7. Mobility • How Protists move • flagellum • cilia • pseudopod

  8. Paramecium with food vacuoles stained red Amoeba ingesting a Paramecium Protist Diversity • Animal-like Protists • heterotrophs, predators • Amoeba • Paramecium • Stentor

  9. Protist Diversity • Excavata • Modified mitochondria • Unique flagella • Giardia Trypanosoma

  10. Protist Diversity • Chromalveolata • Photosynthetic • Parasitic • Kelp • Plasmodium • Diatoms

  11. Protist Diversity • Rhizaria • Thread-like pseudopods • Predators • Amoeba

  12. Protist Diversity • Archaeplastida • Photosynthetic • Closely related to plants • Seaweed • Volvox

  13. Protist Diversity • Unikonta • Tube shaped pseudopods • Closely related to animals • Amoeba • Slime molds

  14. Protist Diversity • Plant-like Protists • autotrophs, photosynthesis • Euglena • algae • diatoms

  15. Protist Diversity • Parasitic & pathogenic Protists • malaria • Giardia • trypanosomes Plasmodium Giardia Trypanosoma

  16. Protist Diversity • Beneficial & necessary Protists • phytoplankton • small algae + diatoms • much of the world’s photosynthesis • produces ~90% of atmospheric oxygen • zooplankton • heterotrophic protists + • key ecological role at base of marine food web

  17. Any Questions??

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