Dynamique et affiliation phylogénétique des bactéries consommatrices de diméthylsulfoniopropionate (DMSP) dans les eaux arctiques
|Advisor:||Levasseur, Maurice; Lovejoy, Connie; Scarratt, Michael Grant|
|Abstract:||The bacterial metabolism of dimethylsulfoniopropionate (DMSP), the precursor of the climate-active gas dimethylsulfide (DMS), was characterized in Arctic waters in September 2008, using the radioisotopic tracer 35S-DMSP and the MAR-CARD-FISH method. DMSP contributed on average 7 and 51% of the bacterial requirements in carbon and sulfur, respectively. Between 40 and 65% of the bacterial community assimilated DMSP, with a stronger contribution from the groups Gammaproteobacteria and Alphaproteobacteria (other than Roseobacter). The different bacterial assemblages were associated with two surface water masses: the Arctic Surface (AS) water, and the warmer and saltier Baffin Bay Surface (BBS) water. In BBS, which showed a higher bacterial abundance, the DMSP uptake was higher than in AS. Those results show that the alteration of water mass characteristics anticipated by current climate models could affect the DMS(P) dynamics and the resulting DMS flux to the atmosphere.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||16 April 2018|
|Collection:||Thèses et mémoires|
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