Methyl mercury production in freshwater microcosms affected by dissolved oxygen levels: role of cobalamin and microbial community composition

Autor: Olof Sangfors, Göran Ewald, Anders Tunlid, Olof Regnell
Rok vydání: 1996
Předmět:
Zdroj: Canadian Journal of Fisheries and Aquatic Sciences. 53:1535-1545
ISSN: 1205-7533
0706-652X
DOI: 10.1139/f96-086
Popis: Radiolabelled Hg(NO(NO3)2 was added to microcosms containing water and sediment from a lake contaminated with cellulose fibres and mercury. We found that anoxic incubation resulted in methyl 203Hg concentrations in the water at least an order of magnitude higher than the levels in oxygenated incubation. This was explained by the fact that both the production and the water solubility of methyl mercury were higher under anoxic conditions than under oxic conditions. Demethylation, however, seemed to play a minor role, if any, in regulating methyl mercury concentrations. In the sediment, the level of methyl 203Hg was strongly correlated with the level of cobalamin and the levels of the phospholipid fatty acids i15:0 and 10Mel 6:0, the latter indicating the presence of Desulfobacter, a genus of sulphate-reducing bacteria. (Less)
Databáze: OpenAIRE
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