Observation puzzle : the rosette

Cnidaires : Siphonophore (crédit photo : Fabien Lombard)

Siphonophore (Photo : Fabien Lombard)

Scientists collecting seawater samples from the rosette (Photo : Stacy Knapp, Woods Hole Oceanographic Institution)

Phytoplankton bloom observed by the ocean color sensor MODIS onboard NASA satellite Terra in May 2010. The bloom spreads broadly in the North Atlantic from Iceland to the Bay of Biscay - Source : NASA's Earth Observatory (http:/earthobservatory.nasa.gov)

Instrumented buoy (Photo : David Luquet)

Instrumented buoy (Photo : Emilie Diamond)

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Siphonophores - The longest animals on the planet
Cousins of corals, siphonophores are colonies of specialized individuals called zoids. Some catch and digest their prey, others swim, or lay eggs or sperm.

Dinoflagellate Ceratium falcatum (Photo : Sophie Marro)

Dinoflagellate Ceratium reflexum (Photo : Sophie Marro)

Dinoflagellate Ceratium gravidum (Photo : Sophie Marro)

Dinoflagellate Ceratium tripos (Photo : Sophie Marro)

Carte bathymétrique de la Mer Méditerranée

Jellyfish Pelagia noctiluca (Photo : Fabien Lombard)

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)

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Pleurobrachia
Propulsées par huit rangées de peignes, les groseilles de mer déploient deux longs tentacules pour pêcher des crustacés.

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

Acantharia (Photo : Fabien Lombard)

Radiolarians (Photo : Fabien Lombard)

Diatom genus Coscinodiscus (Photo : Sophie Marro)