Quizz marine phytoplankton

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)

Surface chlorophyll a concentration in the Mediterranean Sea.

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Colony of diatoms genus Bacillaria whose single cells slide against each other (Video : Sophie Marro)

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)

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

Colony of salps Salpa fusiformis (Photo : Fabien Lombard)

Dinoflagellate Ceratium reflexum (Photo : Sophie Marro)

Instrumented buoy (Photo : Emilie Diamond)

Jellyfish Aequorea aequorea (Photo : Fabien Lombard)

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Underwater glider

Instrumented buoy (Photo : David Luquet)

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

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The profiling float