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Published (Version of Record)CC BY V4.0, Open Access
Journal article
Rapid depletion of dissolved organic sulphur (DOS) in freshwaters
Biogeochemistry, Vol.149, pp.105-113
2020
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 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.
Details
- Title
- Rapid depletion of dissolved organic sulphur (DOS) in freshwaters
- Authors/Creators
- F.L. Brailsford (Author/Creator) - Bangor UniversityH.C. Glanville (Author/Creator) - Bangor UniversityD. Wang (Author/Creator) - Bangor UniversityP.N. Golyshin (Author/Creator) - Bangor UniversityP.J. Johnes (Author/Creator) - University of BristolC.A. Yates (Author/Creator) - University of BristolD.L. Jones (Author/Creator)
- Publication Details
- Biogeochemistry, Vol.149, pp.105-113
- Publisher
- Springer
- Identifiers
- 991005543976007891
- Copyright
- © The Author(s) 2020
- Murdoch Affiliation
- Murdoch University; Centre for Sustainable Farming Systems
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 8 Earth Sciences
- 8.124 Environmental Sciences
- 8.124.2044 Dimethylsulfoniopropionate
- Web Of Science research areas
- Environmental Sciences
- Geosciences, Multidisciplinary
- ESI research areas
- Environment/Ecology