Winter evolution of DMS and DMSP in Venice lagoon water and sediment.
The evolution of dimethylsulphide (DMS) and dimethylsulphoniopropionate (DMSP) concentrations in the water and sediment of the Venice lagoon were studied together with the concentration of chlorophyll a, temperature and the composition and density of phytoplankton to understand the role of the sediment as a source of DMS during the winter period. The temporal trend of water DMS concentration in this period showed a maximum concentration in February (75.7 nmol S l-1) related to low DMSP and chlorophyll a concentrations but to high phytoplanktonic abundance. The DMS and DMSP concentrations were greater in the sediment than in the water. The temporal trend of DMS concentration in sediment showed a maximum in February (1155 nmol S l-1) related to the maximum of DMS concentration in surface water. These observations suggested that in the winter period DMS could be produced by the conversion of the DMSP present in the bulk water but principally by that present in the sediment (microbiological degradation of DMSP or other sulphur-containing compounds) that subsequently diffuse in water.
Gambaro
Andrea
A
Dipartimento di Scienze Ambientali, Università Ca' Foscari, Dorsoduro 2137, I-30123 Venezia, Italy. gambaro@unive.it
Moret
Ivo
I
Piazza
Rossano
R
Da Rin
Eleonora
E
Turetta
Clara
C
Cescon
Paolo
P
D002734:Chlorophyll / Q000032:analysis; D017753:Ecosystem; D019015:Geologic Sediments / Q000737:chemistry; D007558:Italy; D012621:Seasons; D012623:Seawater / Q000737:chemistry*; D013440:Sulfides / Q000032:analysis*; D013452:Sulfonium Compounds / Q000032:analysis*
D013440:Sulfides; D013452:Sulfonium Compounds; D002734:Chlorophyll; C068078:dimethylpropiothetin; C004784:dimethyl sulfide