Quizz observation of the oceans and seas

Dinoflagellate Ceratium carriense var volans (Photo : Sophie Marro)

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Dinoflagellate Ceratium gravidum. In the video one can observe the movement of one of the two flagella. (Video : Sophie Marro)

Instrumented buoy (Photo : David Luquet)

Gelatinous plankton Pelagia and Ctenophores (Photo : Fabien Lombard)

Diatom genus Hemiaulus (Photo : Sophie Marro)

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

Siphonophores Forskalia formosa (Photo : Fabien Lombard)

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Animation of the biosphere obtained from the ocean color sensor SeaWiFS

Instrumented buoy (Photo : Emilie Diamond)

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Velella - Planktonic Vessels
Colonies of polyps transported by prevailing winds, velella drift at the surface of warm seas.

Dinoflagellate Ceratium reflexum (Photo : Sophie Marro)

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)

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The seasonal evolution of the chlorophyll a concentration as seen by a « water color » satellite (SeaWifs) in the Atlantic Ocean.

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This video describes how to perform the Ludion experiment and explains the physical processes involved.

Jellyfish Rhizostoma pulmo (Photo : Fabien Lombard)

Colony of salps Salpa fusiformis (Photo : Fabien Lombard)

Siphonophore (Photo : Fabien Lombard)

Dinoflagellate Ceratium praelongum (Photo : Sophie Marro)