Abstract：
:The fate of the enormous amount of reactive nitrogen released to the environment by human activities in India is unknown. Here we show occurrence of 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 in anoxic hypolimnia of several dam-reservoirs. However, 15N-experiments yielded low 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 (up to 13.9%) in 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 emissions of CH4 and N2O to the atmosphere.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Naqvi SWA,Lam P,Narvenkar G,Sarkar A,Naik H,Pratihary A,Shenoy DM,Gauns M,Kurian S,Damare S,Duret M,Lavik G,Kuypers MMMdoi
10.1038/s41467-018-03607-zsubject
Has Abstractpub_date
2018-03-28 00:00:00pages
1265issue
1issn
2041-1723pii
10.1038/s41467-018-03607-zjournal_volume
9pub_type
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