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Prokaryotes – Bacteria and Archea

Prokaryotes – Bacteria and Archea. No membrane bound organelles. Asexual reproduction by binary fusion. Large surface area to volume ratio. Single celled or colonial. Ecology. Photoautotrophs – i.e. cyanobacteria (blue-green algae).

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Prokaryotes – Bacteria and Archea

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  1. Prokaryotes – Bacteria and Archea No membrane bound organelles Asexual reproduction by binary fusion Large surface area to volume ratio Single celled or colonial

  2. Ecology Photoautotrophs – i.e. cyanobacteria (blue-green algae) Chemoheterotrophs and Photohetertrophs – using active transport, more efficient at low nutrient concentrations Anaerobic metabolism – what’s going on in the hypolimnion of a stratified, anoxic lake? Diapause – it may be that the dormancy is very important in bacteria

  3. Cyanobacteria Prokaryotes (no nucleus or organelles) Blue-green Pigment = Chl a

  4. Filamentous blue-green algae (Cyanophyta)

  5. Protista – Protozoa and algae Eukaryotic (membrane bound organelles, nucleus, mitochondria, chloroplasts in photosynthetic protists) Single celled (although may be colonial)

  6. Heterotrophic Protists Paramecium, amoebas, Euglena, Hydra Protozoa Also Giardia and Cryptosporidium

  7. Photoautotrophic Protista – Algae Phytoplankton Single celled or colonial Floating Benthic algae Attached to surfaces (rocks, sediment)

  8. Chlorophyta - Green Green-yellow green Pigment = Chl a and b Some have flagella

  9. Chrysophyta Yellow green to golden brown Pigment = Chl a and c Some have 2 flagella

  10. Chrysophyta (Golden-brown algae) Diatoms Brown to light green Pigment = Chl a and c Some have flagella Silica walls – composed of 2 frustules

  11. Euglenophyta Pigment = Chl a and b All have flagella Eyespots Most are heterotrophic and autotrophic

  12. Dinoflagellata Gray Pigment = Chl a and c Two flagella Some are highly toxic

  13. Pfisteria

  14. Sexual reproduction – possibly motile gametes or conjugation tubes Asexual reproduction Encystment usually binary fission Germ ination resist ant cell (resting stage) Reproduction - diverse Vegetative cell

  15. Hyphae grouped into mycellium Fungi Chemoautotrophs (saprobic) Yeasts Sexual and asexual reproduction

  16. Breakdown of detritous Parasites on other aquatic organisms Ecological importance

  17. Periphyton (or aufwuchs) – pond scum

  18. A community of algae, fungi, bacteria

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