Freshwater plankton
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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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