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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

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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 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

phytoplankton
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

zooplankton
Zooplankton
  • Three Main Groups
    • Cladocera
    • Copepoda
    • (Crustaceans)
    • Rotifera

Daphnia pulex

cladocera perloo ky
Cladocera - perloočky

Ceriodaphnia reticulata

Bosmina longirostris

  • Filtration feeding
  • Parthogenesis
    • Asexual reproduction of females
    • Poor conditions – males appear, sexual reproduction producing ephippia (winter eggs)
copepoda klanono ci
Copepoda - klanonožci
  • Filtrators and Predators
    • Cyclopoida – i.e. Cyclops
    • Calanoida – i.e. Diaptomus
    • Harpacticoida
  • Nauplius
    • Larval stages (usually 6)
rotatoria v n ci
Rotatoria - vířníci
  • Corona – cilia for movement, capturing food
  • Mastax – grinding organ made of chitin
  • Carapace present in most species

Asplanchna

Keratella

chaoborus
Chaoborus
  • Diptera
  • Important predator on plankton and other insects
web links
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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