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)
Underwater glider (Photo : David Luquet)
Dinoflagellates Ceratium platycorne var platycorne (Photo : Sophie Marro)
Dinoflagellate Ceratium praelongum (Photo : Sophie Marro)
