Download 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!!
1. Bacterioplankton
2. Phytoplankton
3. Zooplankton
Bacteria and Protists

Bacteria




Cyanobacteria (Blue-green algae) –
photosynthesis - i.e. Aphanizomenon flosaquae, 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 – “Algae” –
plants and others with
photosynthesis


Green algae – i.e. Volvox, Spirogyra,
Chlorella, Desmids
Diatoms – silica cell walls, yellowbrown chloroplasts
Pediastrum
Spirogyra
Asterionella
Zooplankton
Three Main Groups
1. Cladocera
2. Copepoda
(Crustaceans)
3. Rotifera
Daphnia pulex
Cladocera - perloočky


Filtration feeding
Parthogenesis


Asexual reproduction of
females
Poor conditions – males
appear, sexual
reproduction producing
ephippia (winter eggs)
Bosmina longirostris
Ceriodaphnia reticulata
Copepoda - klanonožci

Filtrators and Predators




Cyclopoida – i.e. Cyclops
Calanoida – i.e. Diaptomus
Harpacticoida
Nauplius

Larval stages (usually 6)
Rotatoria - vířníci



Corona – cilia for
movement, capturing
food
Mastax – grinding organ
made of chitin
Carapace present in most
species
Asplanchna
Keratella
Chaoborus
Diptera
Important predator on plankton and other insects
Web links

http://www.microscopy-uk.org.uk/full_menu.html
Then “Micro-organisms in ponds”




http://micro.magnet.fsu.edu/optics/olympusmicd/galle
ries/moviegallery/pondscum.html
http://www.microscopyu.com/moviegallery/pondscum
/index.html
http://www.wikipedia.org – i.e. search for “plankton”
http://www.biolib.cz/