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 FUNGI21.3 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 causing found in streams

Amebic dysentery Cryptosporidium

Chlorine resistant, found in city water African Sleeping Sickness

Trypanosoma carried by Tsetse fly.

Malaria

Plasmodium carried by Anopheles mosquito.