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stephen-reed
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Prokaryotes – Bacteria and Archea
No membrane bound organelles
Large surface area to volume ratio
Asexual reproduction by binary fusion
Single celled or colonial
Anaerobic metabolism – what’s going on in the hypolimnion of a stratified, anoxic lake?
Chemoheterotrophs and Photohetertrophs – using active transport, more efficient at low nutrient concentrations
Photoautotrophs – i.e. cyanobacteria (blue-green algae)
Ecology
Diapause – it may be that the dormancy is very important in bacteria
Protista – Protozoa and algae
Eukaryotic (membrane bound organelles, nucleus, mitochondria, chloroplasts in photosynthetic protists)
Single celled (although may be colonial)
Protozoa
Also Giardia and Cryptosporidium
Heterotrophic Protists
Paramecium, amoebas, Euglena, Hydra
Photoautotrophic Protista – Algae
Single celled or colonial
Floating
Phytoplankton
Benthic algae
Attached to surfaces (rocks, sediment)
Chrysophyta (Golden-brown algae) Diatoms
Brown to light greenPigment = Chl a and cSome have flagellaSilica walls – composed of 2 frustules
Reproduction - diverse
Vegetative cell
resistant cell (resting stage)
Encystment
Germination
Asexual reproduction
usually binary fission
Sexual reproduction – possibly motile gametes or conjugation tubes
Fungi
Yeasts
Hyphae grouped into mycellium
Chemoautotrophs (saprobic)
Sexual and asexual reproduction