Pressure effects On marine prokaryoTES (POTES)Entry ID: POTES
Abstract: The ANR POTES program (Pressure effects On marine prokaryoTES) project concerns the role of marine micro-organisms in the mineralization of particulate (POM) and dissolved (DOM) organic matter and on the regeneration of biogenic compounds (silicates, carbonates) in the meso- and bathypelagic zones of the Ocean. Nowadays, most of the information regarding these processes comes from the epi-pelagic ... zone and/or does not take into account the effect of increasing pressure with depth. Yet, it is essential integrate effects of hydrostatic pressure forcing (as well as the associated decrease in temperature) when studying oceanic organic matter (OM) mineralization.
POTES participants have not only a thorough knowledge but also the required equipment (hyperbaric bottles and samplers, sinking particles simulator) developed in collaboration with a private society (M√©tro-Mesures SA) that make it one of the international leader laboratories on hyperbaric topics.
Purpose: The major aim of the POTES project is to determine the effect of pressure on prokaryote community structure, and on their activities related to the OM transformation and mineralization using a double and innovative approach based on both laboratory experiments and in situ studies (ANTARES and DYFAMED sites, North-Western Mediterranean Sea). Due to the high inputs of anthropic OM in the Ocean ... (through wind inputs, rain falls, maritime transport, used waters), we will focus on the fate of both biogenic and anthropic OM. In this context, petroleum hydrocarbons will be considered as a model, as their fate in the meso- and bathypelagic zones remains actually unknown. The proposed experiments specifically allow to characterize and quantify the effects of an increase in hydrostatic pressure and a decrease in temperature on :
(i)The processes of OM mineralization (transformation of POC into DOC, hydrocarbon biodegradation, respiration) and on the regeneration of biogenic compounds (silicates, carbonates) in intermediary and deep oceanic waters;
(ii)The structural ((phylo)genetic) and functional (activities) dynamics of prokaryotic communities;
(iii)The flux of POM in the water column and the kinetic of particle transformation in the mesopelagic zone ; these information will be incorporated into a model describing the transformation of particles by micro-organisms in the entire water column.
Start Date: 2005-01-01Stop Date: 2008-12-31
OCEANS > OCEAN CHEMISTRY > BIOGEOCHEMICAL CYCLES
OCEANS > OCEAN CHEMISTRY > ORGANIC MATTER
OCEANS > OCEAN PRESSURE > WATER PRESSURE
BIOLOGICAL CLASSIFICATION > PROTISTS
BIOLOGICAL CLASSIFICATION > BACTERIA/ARCHAEA
BIOSPHERE > AQUATIC ECOSYSTEMS > PLANKTON > PHYTOPLANKTON
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > BIOGEOCHEMICAL CYCLES
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > NUTRIENT CYCLING
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > DECOMPOSITION
BIOSPHERE > ECOLOGICAL DYNAMICS > ECOSYSTEM FUNCTIONS > PRIMARY PRODUCTION
ISO Topic Category
Phone: +33(0)4 91 82 90 53
Email: tamburini at univmed.fr
LMGEM UMR 6117 / CNRS - Universite de la Mediterranee - Centre d'Oceanologie de Marseille / 163 Avenue de Luminy
Postal Code: 13288
Al Ali B.*, Garel M., Cuny P., Miquel J.-C., Toubal T., Robert A.* & Tamburini C. (2010). Luminous bacteria in the deep-sea waters near the ANTARES underwater neutrino telescope (NW Mediterranean Sea). Chemistry & Ecology, 26 (1): 57-72.
Tapilatu Y.*, Acquaviva M., Guigue C., Miralles G., Bertrand J.C. & Cuny P. (2010). Isolation of alkane-degrading bacteria from deep-sea Mediterranean sediments. ... Letters in Applied Microbiology, , 50: 234-236.
Tamburini C., Garel M., Al Ali B., Mérigot B., Kriwy P., Charrière B. and Budillon G. (2009a). Distribution and activity of Bacteria and Archaea in the different water masses of the Tyrrhenian Sea. Deep-Sea Research II 56 (11-12): 700-712.
Tamburini C., Goutx M., Guigue C., Garel M., Lefèvre D., Charrière B., Sempéré R., Pepa S., Peterson M. L., Wakeham S., Lee C. (2009b). Effects of hydrostatic pressure on microbial alteration of sinking fecal pellets. Deep-Sea Research II 56 (18): 1533-1546
Creation and Review Dates
DIF Creation Date: 2011-02-03
Last DIF Revision Date: 2011-03-18