Vue sous-marine d'un groupe de mésocosmes montrant la structure de flottaison en surface (© Stareso)

Surface chlorophyll a concentration in the Mediterranean Sea.

Siphonophores (Photo : Fabien Lombard)

Rosette used to collect seawater samples during a scientific cruise in the South Pacific Ocean. During the austral summer, the amount of chlorophyll a is so low that the water becomes deep blue, almost purple. (Photo : Joséphine Ras)

Profiling float (Photo : David Luquet)

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

Dinoflagellate Ceratium reflexum (Photo : Sophie Marro)

Deployment of a profiling float (Photo : Jean-Jacques Pangrazi)

Dinoflagellate Ceratium furca (Photo : Sophie Marro)

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

Phytoplankton bloom observed in the Barents Sea (North of Norway) in August 2010 by the ocean color sensor MODIS onboard NASA satellite Aqua. Changes in ocean color result from modifications in the phytoplankton composition and concentration. The green colors are likely associated with the presence of diatoms. The shades of light blue result from the occurrence of coccolithophores, phytoplankton organisms that strongly reflect light due to their chalky shells - Source : NASA's Earth Observatory (http:/earthobservatory.nasa.gov)

Siphonophore Forskalia formosa (Photo : Fabien Lombard)

Dinoflagellate Ceratium tripos (Photo : Sophie Marro)

Rosette for collecting seawater samples