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protists.notebook May 07, 2012
The protozoans (Kingdom Protista) are varied and thier taxonomy is often debated. The most recognized classification groups them into two major categories:
2 Types of Protists 1. Plant like protists (not plants,but have similarities like photosynthesis)2. Animallike protists (not actually animals,but "eat" like animals do)
Protists
Prokaryotes vs. Eukaryotes
Debatable 3rd type:3. Funguslike protists
protists.notebook May 07, 2012
Plantlike Protists • they are "plantlike" because they contain chlorophyll and carry out photosynthesis • they are autotrophic • However, in darkness they become heterotrophic engulf solid food
Euglenas • move by a whiplike structure called flagella. • the eyespot is sensitive to light. • reproduce asexually.
euglena partyhttp://www.youtube.com/watch?v=JNwh67CPh8
protists.notebook May 07, 2012
Algae • Green, brown and red algae • Aquatic organisms but are also found in soils, on the lower trunks of trees and on rocks • Primary food producers in aquatic food chains • Supply about 80% of global supply of oxygen • There are many uses to algae:
o consumed as food by humans, o used as fertilizers o help create petroleum resources
Example: phytoplankton
• some species can be multicellular (volvox, kelp)• includes the diatoms, with glasslike 2 part shells• includes the dinoflagellates, unicellular with two flagella (cause red tide)
phytoplankton kelp
diatoms
protists.notebook May 07, 2012
Animallike Protists • are singlecelled eukaryotes • classification is based on the way they move and feed. • they are heterotrophs
The Zooflagellates • These species move by flagella and may have one, two or many flagella. • some live in fresh or salt water, most live in the bodies of larger organisms. • eg. Trypanosoma (causes African sleeping sickness, carried by the tse tse fly)
protists.notebook May 07, 2012
The Amoebas • they live in ponds, where they crawl along the bottom or over plants • they reproduce asexually by binary fission • they eat by phagocytosis• they move using pseudopods
Parasitic amoebas cause amoebic dysentery
amoeba feedshttp://www.youtube.com/watch?v=W6rnhiMxtKU
http://www.youtube.com/watch?v=zTFsn9xt7b0
giant amoeba
protists.notebook May 07, 2012
The Ciliates • use cilia to move and capture food • most ciliates are free living in fresh or salt water, some attach to a surface by a stalk and stay in one place others live in bodies of host animals. • eq. Paramecium
paramecium feedshttp://www.youtube.com/watch?v=saLYHUs6cWk
protists.notebook May 07, 2012
The Sporozoans • are parasitic, absorbing food from the fluids of their host • have no means of locomotion • reproduce by the formation of spores. • eg. Plasmodium Vivax (causes Malaria)
AND.....The Funguslike Protists:The Slime Moulds
• all are heterotrophic, most are decomposers• live in cool damp habitats• are acellular, cellular, or water moulds
slime mold time lapsehttp://www.youtube.com/watch?v=GScyw3ammmk