CYBELE Biogeochemical cycles and functional role of planktonic microorganism assemblages



Responsibles : France Van Wambeke et Gérald Grégori



The major objective of CYBELE team is to better understand the role of the first autotrophic and heterotrophic levels of the planktonic food web in the biogeochemical cycles, and their dynamics (biological pump, export) in the context of global change. Indeed, these alterations influence the biological pump, which will result in a modification of the carbon sequestration processes by the oceans. The team mainly focuses on:

  • The functional role of major marine planktonic groups (unicellular microorganisms), in particular with a single cell level approach,
  • The cycle of the biogenic elements in the seawater column: budgets, fluxes, spatial and temporal variability, stoichiometry, balance autotrophy / heterotrophy,
  • Planktonic structure interactions / biogeochemical cycles at different time-space scales, allowing to appreciate their variability and the causes of this variability.

The members of the team combine experimental approaches, fieldwork and modeling. Biogeochemical modeling (Eco3M) occurs upstream and downstream of experiments and oceanographic campaigns and is coupled with physics. This requires strong interactions with all the MIO teams and involvement in various transversal axes (COUPLING, Biological Pump, ETE) and observation (MIO-OBS).


See the team's publications

The planktonic image library

Corethron pennatum
Entomoneis sp
Navicula septentrionalis
Ceratocorys sp

Knowledge of the structure of phyto- and zooplankton communities is necessary to understand the intensity of primary production in surface waters and the effectiveness of carbon transfer to the deep ocean.

In parallel to our studies linking planktonic diversity to the cycle of biogenic elements in the ocean, we provide a gallery of microplankton images collected during our various field campaigns.

Discover ocean planktonic images acquired by optical or scanning electron microscopy during various oceanographic research campaigns !