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.
Les Dinoflagellés - Ceratium hexacanthum chaîne de Ceratium hexacanthum qui restent les uns à la suites des autres au fur et à mesure des divisions. Le mouvement des flagelles est bien visible.
Diatoms - Life in glass houses Champions of photosynthesis, these unicellular organisms appeared at the time of dinosaurs.They produce a quarter of the oxygen we breathe.
Surface chlorophyll a concentration in the global ocean.
The research vessel "James COOK"
Dinoflagellate Ceratium paradoxides (Photo : Sophie Marro)
The seasonal evolution of the chlorophyll a concentration as seen by a « water color » satellite (SeaWifs) in the Atlantic Ocean.
Deployment of a profiling float (Photo : Jean-JacquesPangrazi)
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)
