Protista - Dinoflagellates main component of plankton...

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Protista Eukaryote Phylogeny - Protist: eukaryote that is not an animal, plant, or fungi - Protista is a paraphyletic group (i.e. not monophyletic) What Are Protists? - Usually unicellular - Membrane bound nucleus - Specialized organelles (e.g. mitochondria, chloroplasts) - Nutritionally diverse (autotrophs, heterotrophs, mixotrophs) - Usually aquatic - Sexual and asexual reproduction - Highly diverse Endosymbiosis in Protists - Endosymbiosis lead to high protist diversity - Eukaryotic Heterotroph engulfs photosynthetic cyanobacterium - Bacterium loses membrane, forms chloroplast. Two algae lineages arise - Eukaryotic heterotroph engulfs alga Five Eukaryotic Super Groups - Excavata - Most: - Highly modi±ed mitochondria - poses multiple flagella - excavated feeding groove - Giardia intestinalis: leading cause of non-bacterial gastroenteritis - Trichomonas vaginalis: Most common pathogenic protist infection in
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industrialized countries; increases HIV susceptibility - Chromalveolata - Derived from secondary endosymbiosis of red alga
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Unformatted text preview: - Dinoflagellates: main component of plankton; usually photosynthetic- Obligate symbiosis with corals- Cause red tides- Apicomplexa: mostly parasites of animals; plasmodium causes malaria- Ciliates: use cilia to move/feed; 2 types of nuclei (micro and macronuclei); oral groove- Diatoms: photosynthetic algae contained in silica “shell” (i.e. glass);- Contribute 45% of ocean primary productivity- Brown Algae: largest, most complex algae; many seaweeds, kelp- Rhizaria- Amoeba like; thread-like pseudpodia (false feet)- Foraminifera: CaCO2 shell (test); excellent index fossils; oil industry relies heavily for aging strata- Radiolarians: silicia shell (test)- Archaeplastida- Red Algae- Unikonta- Amoebazoans; tube like pseudopodia- Plasmodial slime mold: plasmodium (feeding form) single cell membrane, multinucleated- Entamoebas: Amoeboid; pseudopodia; often parasitic- Most closely related cousin choanoflagellates...
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This note was uploaded on 09/21/2011 for the course BSC 2010 taught by Professor Bowes during the Spring '08 term at University of Florida.

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Protista - Dinoflagellates main component of plankton...

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