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.
21.3 The Ecology of Protists 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 Amebic dysentery Cryptosporidium 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.