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Methane stimulates massive nitrogen loss from freshwater reservoirs in India

Methane stimulates massive nitrogen loss from freshwater reservoirs in India
Methane stimulates massive nitrogen loss from freshwater reservoirs in India
The fate of the enormous amount of reactive nitrogen released to the environment by human activities in India is unknown. Our study of several dam-reservoirs revealed seasonal stratification and generally low concentrations of dissolved inorganic combined nitrogen, and high molecular nitrogen (N2) to argon ratio, thus suggesting seasonal loss to N2. However, 15N-experiments yielded low to undetectable rates of denitrification, anaerobic ammonium oxidation and dissimilatory nitrate reduction to ammonium – except in the presence of methane (CH4) that caused ~12-fold increase in denitrification. While nitrite-dependent anaerobic methanotrophs belonging to the NC10 phylum were present, previously considered ‘aerobic’ methanotrophs were far more abundant (upto 13.9%) in the anoxic hypolimnion. Methane accumulation in anoxic freshwater systems seems to facilitate rapid loss of reactive nitrogen, with generally low production of nitrous oxide (N2O), through widespread coupling between methanotrophy and denitrification, potentially mitigating eutrophication and 13 emissions of CH4 and N2O to the atmosphere.
1-10
Naqvi, S. Wajih A.
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Lam, Phyllis
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Narvenkar, Gayatree
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Sarkar, Amit
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Naik, Hema
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Pratihary, Anil
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Shenoy, Damodar M
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Gauns, Mangesh
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Kurian, Siby
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Damare, Samir
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Duret, Manon
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Lavik, Gaute
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Kuypers, Marcel M.M.
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Naqvi, S. Wajih A.
b8e966b5-c3b5-4398-9057-56c0818f2673
Lam, Phyllis
996aef80-a15d-4827-aed8-1b97b378f6ad
Narvenkar, Gayatree
07e65486-1f94-4b87-b3be-5033fa9281ff
Sarkar, Amit
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Naik, Hema
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Pratihary, Anil
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Shenoy, Damodar M
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Gauns, Mangesh
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Kurian, Siby
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Damare, Samir
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Duret, Manon
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Lavik, Gaute
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Kuypers, Marcel M.M.
b6288cfb-42bc-469c-93fe-8fbb40d97bec

Naqvi, S. Wajih A., Lam, Phyllis, Narvenkar, Gayatree, Sarkar, Amit, Naik, Hema, Pratihary, Anil, Shenoy, Damodar M, Gauns, Mangesh, Kurian, Siby, Damare, Samir, Duret, Manon, Lavik, Gaute and Kuypers, Marcel M.M. (2018) Methane stimulates massive nitrogen loss from freshwater reservoirs in India. Nature Communications, 9, 1-10. (doi:10.1038/s41467-018-03607-z).

Record type: Article

Abstract

The fate of the enormous amount of reactive nitrogen released to the environment by human activities in India is unknown. Our study of several dam-reservoirs revealed seasonal stratification and generally low concentrations of dissolved inorganic combined nitrogen, and high molecular nitrogen (N2) to argon ratio, thus suggesting seasonal loss to N2. However, 15N-experiments yielded low to undetectable rates of denitrification, anaerobic ammonium oxidation and dissimilatory nitrate reduction to ammonium – except in the presence of methane (CH4) that caused ~12-fold increase in denitrification. While nitrite-dependent anaerobic methanotrophs belonging to the NC10 phylum were present, previously considered ‘aerobic’ methanotrophs were far more abundant (upto 13.9%) in the anoxic hypolimnion. Methane accumulation in anoxic freshwater systems seems to facilitate rapid loss of reactive nitrogen, with generally low production of nitrous oxide (N2O), through widespread coupling between methanotrophy and denitrification, potentially mitigating eutrophication and 13 emissions of CH4 and N2O to the atmosphere.

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Accepted/In Press date: 31 January 2018
e-pub ahead of print date: 28 March 2018
Published date: 2018

Identifiers

Local EPrints ID: 419269
URI: https://eprints.soton.ac.uk/id/eprint/419269
PURE UUID: 7b60a39d-4d5c-4a95-9d77-e897e7eaee96
ORCID for Phyllis Lam: ORCID iD orcid.org/0000-0003-2067-171X
ORCID for Manon Duret: ORCID iD orcid.org/0000-0002-0922-4372

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Date deposited: 09 Apr 2018 16:30
Last modified: 15 Aug 2019 00:34

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Contributors

Author: S. Wajih A. Naqvi
Author: Phyllis Lam ORCID iD
Author: Gayatree Narvenkar
Author: Amit Sarkar
Author: Hema Naik
Author: Anil Pratihary
Author: Damodar M Shenoy
Author: Mangesh Gauns
Author: Siby Kurian
Author: Samir Damare
Author: Manon Duret ORCID iD
Author: Gaute Lavik
Author: Marcel M.M. Kuypers

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