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Freshwater plankton

Freshwater plankton. Free living in open water Position mostly determined by currents (as opposed to i.e. fish) Three main groups – NOT exact!! Bacterioplankton Phytoplankton Zooplankton. Bacteria and Protists. Bacteria

judah-william
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Freshwater plankton

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  1. Freshwater plankton • Free living in open water • Position mostly determined by currents (as opposed to i.e. fish) • Three main groups – NOT exact!! • Bacterioplankton • Phytoplankton • Zooplankton

  2. Bacteria and Protists • Bacteria • Cyanobacteria (Blue-green algae) – photosynthesis - i.e. Aphanizomenon flos-aquae, Anabaena • Heterotrophic – use organic molecules for nutrition – i.e. Azotobacter, Clostridium • Nitrogen fixation in both groups • Protists – unicellular, not animals, plants, bacteria, or fungi • Ciliates – i.e. Paramecium • Flagellates – i.e. Euglena, Dinoflagellates Anabaena

  3. Phytoplankton • Phytoplankton – “Algae” – plants and others with photosynthesis • Green algae – i.e. Volvox, Spirogyra, Chlorella, Desmids • Diatoms – silica cell walls, yellow-brown chloroplasts Pediastrum Spirogyra Asterionella

  4. Zooplankton • Three Main Groups • Cladocera • Copepoda • (Crustaceans) • Rotifera Daphnia pulex

  5. Cladocera - perloočky Ceriodaphnia reticulata Bosmina longirostris • Filtration feeding • Parthogenesis • Asexual reproduction of females • Poor conditions – males appear, sexual reproduction producing ephippia (winter eggs)

  6. Copepoda - klanonožci • Filtrators and Predators • Cyclopoida – i.e. Cyclops • Calanoida – i.e. Diaptomus • Harpacticoida • Nauplius • Larval stages (usually 6)

  7. Rotatoria - vířníci • Corona – cilia for movement, capturing food • Mastax – grinding organ made of chitin • Carapace present in most species Asplanchna Keratella

  8. Chaoborus • Diptera • Important predator on plankton and other insects

  9. Web links • http://www.microscopy-uk.org.uk/full_menu.html Then “Micro-organisms in ponds” • http://micro.magnet.fsu.edu/optics/olympusmicd/galleries/moviegallery/pondscum.html • http://www.microscopyu.com/moviegallery/pondscum/index.html • http://www.wikipedia.org – i.e. search for “plankton” • http://www.biolib.cz/

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