Protists

Kingdom Protista Eukaryotes Unicellular or multicellular CLASSIFIED according to the way they obtain nutrients: Animal-like protist - heterotroph Plant-like protist - autotroph Fungi-like protist - decomposer

Bacteria

Protozoans Animal-like Protists

Protozoans Classified by how they move: 1. Zooflagellates – use flagella 2. Sarcodines (ameoba) – use pseudopods 3. Ciliates (paramecium) – use cilia 4. Sporozoans - parasitic

Structure of protozoans – Food vacuole –stores food Contractile vacuole – regulate water level Gullet – trap food Anal pore – releases waste

Amoebas in Action

Disease Protozoan Malaria Plasmodium species – carrier Anopheles mosquito Toxoplasmosis Toxoplasma species – carrier birds, rodents, cats Giardiasis Giardia species – carrier beavers; contaminated H2O Chagas Disease Trypanosoma species – carrier kissing bug African Sleeping Sickness Trypanosoma species – carrier Tsetse fly Amebic Dysentery Entamoeba species – contaminated H2O

Toxoplasmosis parasites

PLANT-LIKE PROTIST (AKA: ALGAE)

Unicellular Algae - 1. Euglena 2. Dinoflagellates – algal blooms produce red tide 3. Diatoms – produce thin cell walls rich in silicon (make glass) Multicellular Algae (aka: seaweed) – red, brown, green algae

Phytoplankton – population of photosynthetic organism When waste is excessive, algae grows into masses called algal blooms; depletes nutrient in H2O which kills aquatic organisms

Euglenas

Diatoms: The Golden Ones

Dinoflagellates Cause Red Tides

Red, Brown, and Green Algae:

Human uses of Algae – much of Earth’s O2 is produced by algae – uses photosynthesis to produce oxygen chemicals in algae – medicines (treat stomach ulcers), make plastics, waxes, etc. food --nori wraps in sushi, ice cream, candy bars, syrups, etc.

Fungus-like Protists

Characteristics of Fungus-like Protists Includes slime molds & water molds Multicellular, heterotrophic Live in moist or watery habitats Can be parasites & cause plant diseases Produce spores