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)

Siphonophores Forskalia formosa (Photo : Fabien Lombard)

Krill (Photo : Fabien Lombard)

Satellite observation (GEOS-12) of Hurricane Katrina in August 2005 in the Gulf of Mexico - Source : NASA-NOAA

Prélèvements d'eau des mésocosmes pour analyses, lors de l'expérience menée en Corse en juin/juillet 2012 (© A. Ree, PML)

Surface chlorophyll a concentration in the Mediterranean Sea.

Carte bathymétrique mondiale

Rosette for collecting seawater samples

Dinoflagellates Ceratium platycorne var platycorne (Photo : Sophie Marro)

Ctenaria Lampetia pancerina  (Photo : Fabien Lombard)

Vue sous-marine d'un groupe de mésocosmes montrant un plongeur récoltant les pièges à sediment (© Stareso)

Profiling float (Photo : David Luquet)

Dinoflagellate Ceratium paradoxides (Photo : Sophie Marro)

Underwater glider (Photo : David Luquet)

Large rosette sampler used in the "World Ocean Circulation Experiment". This rosette has 36 10-liter Niskin bottles, an acoustic pinger (lower left), an "LADCP" current profiler (yellow long tube at the center), a CTD (horizontal instrument at the bottom), and transmissometer (yellow short tube at the center). (Photo : L. Talley)

Diatom genus Coscinodiscus (Photo : Sophie Marro)

Squid larva (Photo : Fabien Lombard)

Jellyfish Leuckaztiara octona (Photo : Fabien Lombard)