21.3_The_Ecology_of_Protists
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Transcript 21.3_The_Ecology_of_Protists
1 Review Give three examples of photosynthetic
protists
Predict How would ocean food chains change in the
absence of photosynthetic protists
2 Explain By what two methods do parasitic protists
primarily spread disease
Form an Opinion Why are protist caused disease
more widespread in tropical areas of the world.
CH 21 PROTISTS AND FUNGI
21.3 The Ecology of Protists
Autotrophic Protists
Phytoplankton
Red and brown algae
Euglena
Dinoflagellates.
Base of many aquatic food chains
Half of Earth’s photosynthesis is carried out by
phytoplankton
Phytoplankton feeds both shrimp and some
whales.
Provide coral reefs with energy and also calcium
carbonate
Brown kelp can grow up to 60 meters
Can create “algae blooms”
Red
tide.
Heterotrophic Protists
Amoebas
Surround a cell or particle and take it inside
themselves to form a food vacuole
Food vacuole
Small
cavity in the cytoplasm that temporarily stores
food
Materials are digested and nutrients removed
Wastes stay in and food vacuole brings to edge of cell.
Ciliates
Use cilia to sweep food particles into gullet
Gullet
Indentation
in one side of the organism
Particles are forced into food vacuoles that form at
base.
Food vacuoles pinch off into cytoplasm and fuse
with lysosomes
Waste materials are emptied when the food
vacuole fuses with the anal pore.
Slime Molds
Key roles in recycling nutrients in an ecosystem
Uses decaying organic material.
Slime Molds
Amoeba like cells.
Forms together into a large structure known as a
plasmodium.
Plasmodium develops sporangia
Meiosis produces haploid spores to continue the
cycle inside.
Mutualistic Protists
Trichonympha and termites.
Parasites and Disease
Debilitating intestinal diseases, African sleeping
sickness, and malaria.
Intestinal Diseases
Giardia
Diarrhea
Amebic dysentery
Cryptosporidium
Chlorine
causing found in streams
resistant, found in city water
African Sleeping Sickness
Trypanosoma
carried by Tsetse fly.
Malaria
Plasmodium carried by Anopheles mosquito.