Average chlorophyll concentration in the surface ocean (from mi-September 1997 to August 2007) from the ocean color sensor SeaWiFS (NASA). Subtropical gyres, in the center of the oceanic basins, are characterized by very low concentrations of chlorophyll a (dark blue) - Source : NASA's Earth Observatory (http:/earthobservatory.nasa.gov)

Vue sous-marine d'un groupe de mésocosmes (© Stareso)

Dinoflagellate Ceratium macroceros var macroceros (Photo : Sophie Marro)

Gelatinous plankton Pelagia and Ctenophores  (Photo : Fabien Lombard)

Gelatinous plankton salpes and Beroe (Photo : Fabien Lombard)

Ctenaria Eucharis multicornis  (Photo : Fabien Lombard)

Dinoflagellate Ceratium gravidum (Photo : Sophie Marro)

Surface chlorophyll a concentration in the Mediterranean Sea.

Diatom genus Chaetoceros (Photo : Sophie Marro)

Instrumented buoy (Photo : David Luquet)

Mollusk  (Photo : Fabien Lombard)

Dinoflagellate Ceratium gravidum (Photo : Sophie Marro)

Teaching sheets

Jellyfish Pelagia noctilica  (Photo : Fabien Lombard)

Rosette used to collect seawater samples during a scientific cruise in the South Pacific Ocean. (Photo : Joséphine Ras)

Dinoflagellate Ceratium fusus (Photo : Sophie Marro)

Scientists collecting seawater samples from the rosette (Photo : Stacy Knapp, Woods Hole Oceanographic Institution)