PelegrÝ, S. P.. CNRS, pelegri@ccrv.obs-vlfr.fr
Rassoulzadegan, F. P.. CNRS, rassoul@ccrv.obs-vlfr.fr

 
COLLOIDAL AND DISSOLVED ORGANIC CARBON EGESTION BY AN HETEROTROPHIC NANOFLAGELLATE
 
Laboratory experiments were conducted on nanoflagellate egestion by using inactive bacteria and a new method of measuring carbon content of microorganisms by high temperature catalytic oxidation. The results indicate that 35% of the ingested bacterial carbon was egested in the form of colloidal organic carbon > 0.2 Ám (COC), while 9% was egested in the form of dissolved organic carbon (< 0.2 Ám). The nanoflagellate Pteridomonas danica could have reingested as much as 20% of the previously egested COC later in the incubation as food scarcity increased. The contribution of small flagellates to submicrometric particles in the ocean, and the implications of particle reingestion for the microbial food web are discussed.
 
Day: Wednesday, Feb. 3
Time: 09:45 - 10:00am
Location: Hilton of Santa Fe
 
Code: SS38WE0945H