Lab 3 - Algae and cyanobacteria

Lab 3 - Algae and cyanobacteria - Lab #3 Algae and...

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Lab #3 – Algae and cyanobacteria Ioana Dobre
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Algae -photosynthetic organisms, generally considered plants - Cyanobacteria however belongs to Domain Bacteria - Flagellated algae like Chlamydomonas belong to Domain Eukarya, Kingdom Protista - Cyanobacteria is the most ancient line that developed oxygenic photosynthesis during precambrian - Chlorophyta (green algae) believed to have given rise to terrestrial land plants - They are the primary producers in aquatic ecosystems Morphological types: - colonies, filaments, or clusters of filaments - They may also be macroscopic like the seaweeds - Algae are found in every habitat or ecosystem
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- Some algal blooms are toxic, such as marine red tides caused by dinoflagellates - In terrestrial ecosystem, algae are abundant in soils and sometimes tree bark - Lichens –> grow on rocks and trees, they are a symbiotic relationship between fungi and members of Cyanobacteria or Chlorophyta Cyanobacteria - Have a bluish tint oe may appear black, red-purple, yellow or green - In addition to the green and yellow photosynthetic pigments ( chlorophyll and carotenoids) they contain blue phycocyanin and red phycoerythrin - These are distributed throughout the cytoplasm instead of being localized in plastids - When present in large numbers they can also cause a reddish or bluish tinge to the water causing surface ‘blooms’ in nutrient rich waters - Each individual has one or several non-nucleated cells
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This note was uploaded on 02/21/2012 for the course BIO Bio2137 taught by Professor Namroud during the Fall '11 term at University of Ottawa.

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Lab 3 - Algae and cyanobacteria - Lab #3 Algae and...

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