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- W3021130359 abstract "Abstract Sulphur (S) is a key macronutrient for all organisms, with similar cellular requirements to that of phosphorus (P). Studies of S cycling have often focused on the inorganic fraction, however, there is strong evidence to suggest that freshwater microorganisms may also access dissolved organic S (DOS) compounds (e.g. S-containing amino acids). The aim of this study was to compare the relative concentration and depletion rates of organic 35 S-labelled amino acids (cysteine, methionine) with inorganic S (Na 2 35 SO 4 ) in oligotrophic versus mesotrophic river waters draining from low nutrient input and moderate nutrient input land uses respectively. Our results showed that inorganic SO 4 2− was present in the water column at much higher concentrations than free amino acids. In contrast to SO 4 2− , however, cysteine and methionine were both rapidly depleted from the mesotrophic and oligotrophic waters with a halving time < 1 h. Only a small proportion of the DOS removed from solution was mineralized and excreted as SO 4 2− (< 16% of the total taken up) suggesting that the DOS could be satisfying a demand for carbon (C) and S. In conclusion, even though inorganic S was abundant in freshwater, it appears that the aquatic communities retained the capacity to take up and assimilate DOS." @default.
- W3021130359 created "2020-05-13" @default.
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- W3021130359 date "2020-05-01" @default.
- W3021130359 modified "2023-10-13" @default.
- W3021130359 title "Rapid depletion of dissolved organic sulphur (DOS) in freshwaters" @default.
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- W3021130359 doi "https://doi.org/10.1007/s10533-020-00669-4" @default.
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