Rapid depletion of dissolved organic sulphur (DOS) in freshwaters
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
Fersiynau electronig
Dogfennau
- Brailsford2020_Article_RapidDepletionOfDissolvedOrgan
Fersiwn derfynol wedi’i chyhoeddi, 1.13 MB, dogfen-PDF
Trwydded: CC BY Dangos trwydded
Dangosydd eitem ddigidol (DOI)
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 35S-labelled amino acids (cysteine, methionine) with inorganic S (Na235SO4) in oligotrophic versus mesotrophic river waters draining from low nutrient input and moderate nutrient input land uses respectively. Our results showed that inorganic SO42− was present in the water column at much higher concentrations than free amino acids. In contrast to SO42−, 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 SO42− (< 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.
Allweddeiriau
Iaith wreiddiol | Saesneg |
---|---|
Tudalennau (o-i) | 105-113 |
Nifer y tudalennau | 9 |
Cyfnodolyn | Biogeochemistry |
Cyfrol | 149 |
Rhif y cyfnodolyn | 1 |
Dynodwyr Gwrthrych Digidol (DOIs) | |
Statws | Cyhoeddwyd - 2 Mai 2020 |
Cyfanswm lawlrlwytho
Nid oes data ar gael