1 / 26

Chapter 20 - Protists

Chapter 20 - Protists. What’s in a name?. Derived from Greek word meaning “The Very First” – Proto Side 1 538 - 542. Characteristics:. Eukaryotic Unicellular - may be Colonial or filamentous (Spirogyra and Volvox) Plant-like, Animal-like, or Fungus-like characteristics.

michelesloan
Download Presentation

Chapter 20 - Protists

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Chapter 20 - Protists

  2. What’s in a name? • Derived from Greek word meaning “The Very First” – Proto Side 1 538 - 542

  3. Characteristics: • Eukaryotic • Unicellular - may be Colonial or filamentous (Spirogyra and Volvox) • Plant-like, Animal-like, or Fungus-like characteristics

  4. Where did they come from? • Lynn Margulis’ Endosymbiont Hypothesis – Present day Protists evolved from the symbiotic relationship of prokaryotes that lived together until eventually, they had to remain together. • Used organelle evidence: • Mitochondria and chloroplasts are actually Eubacteria & blue-green bacteria (now Archaeabacteria). • Flagella were spirochetes • Further proof provide by the then algae, Cyanophora paradoxa when their chloroplasts were removed, they were actually blue-green bacteria which were able to reproduce & multiply

  5. Animal-like Protists Protozoans – First animals • Classification is based on method of mobility • Ciliophora - Ciliates • Paramecium, Stentor, Didinium, Vorticella • Have cilia for mobility

  6. Protozoan Structures • Contractile vacuole – Regulates water pressure • Trichocysts – defense mechanisms • Macronucleus – binary fission • Micronucleus – Conjugation • Gullet – food is packaged into food vacuoles • Oral groove – cilia lined to sweep food into gullet • 538 539 39273P

  7. Paramecium Euplotes Paramecium w/ trichocysts Didinium Stentor Vorticella

  8. Didinium feedingParamecium feeding

  9. Flagellates • Peranema Giardia (Giardiasis),Trypanosoma and Chilomonas • Have flagella for mobility (Peranema - 38601P) • Many are parasitic and cause intestinal distress

  10. Spore forming Protists • Plasmodium (Malaria) & Toxoplasmosis • Nonmotile • Parasitic • Reproduce by forming spores in host cells

  11. Pseudopod Protists • Amoeba, Radiolarians and Formanifera 528 - 536 • Move using pseudopods or false feet 531 • Pseudopods are used for movement and phagocytosis of food • 532, 38894P

  12. Amoeba

  13. Feeding

  14. Reproduction • Most Protozoa reproduce by binary fission & conjugation (Ciliates) • 532- 535, 538

  15. Plant-like Protists • Classified by their main pigment • Euglenophyta – Euglena576 & 577 • Move using Flagella • Eyespot as a photoreceptor to keep organism in photic zone • May be auto or heterotrophic

  16. 2. Dinoflagellates – Fire algae • Dinoflagellates 570 & 571 • 2 flagella • Bioluminesce– gives off light • Produce a neurotoxin – cause Red Tides when they bloom and Paralytic Shellfish poisoning in clams and oysters. 569 • (Blooms concentrate in shell fish then into fish which we eat. Weaken or even kill the weak.)

  17. Sea Sparkle

  18. Red Tides • Caused by a bloom in Dinoflagellates, Karenia (Gymnodinium) breve • Produce neurotoxins • Responsible for large die-offs of marine organisms and seabirds Karenia brevis

  19. Diatoms • Diatoms 563 - 566 • Silica shell • Diatomaceous earth as filtering and also abrasives • Store food as oil (buoyancy)

  20. 4. Green algae • Volvox and Spirogyra 547 & 548 • May have flagella or be immobile like Spirogyra • Main pigment is Chlorophyll a & b

  21. Fungus-like Protists • 544 & 545 Video • Slime molds – Found in nutrient rich materials like mulch, compost and thickwet lawns. • Absorptive heterotrophs • Witches’ butter

  22. Volvox Spirogyra Euglena Vorticella Amoeba Stentor Peranema Blepharisma Paramecium & Didinium Diatoms

More Related