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• W4214545305 abstract "Abstract. Coupled nitrification-denitrification plays a critical role in the removal of excess nitrogen, which is chiefly caused by humans, to mitigate estuary and coastal eutrophication. Despite its obvious importance, limited information about the relationships between nitrifying and denitrifying microbial communities in estuaries, and their controlling factors have been documented. By analyzing the ammonia monooxygenase gene amoA, including archaeal and bacterial amoA, and the dissimilatory nitrite reductase gene nirS using clone libraries and quantitative PCR (qPCR), we investigated the nitrifying and denitrifying microbial communities in the estuary of turbid subtropical Yangtze River (YRE), the largest river in Asia. The diversity indices and rarefaction analysis revealed a quite low diversity for both β-proteobacterial and archaeal amoA genes, but qPCR data showed significantly higher amoA gene copy numbers for archaea than β-proteobacteria, suggesting that the archaea might play a dominant role in nitrification in the YRE. Compared with the amoA gene, a distinctly higher level of diversity but lower gene copy numbers were found for thenirS gene suggesting lower denitrification than nitrification potential. 15N incubation experiments indicated that nitrification rates were strongly correlated with amoA gene abundances while denitrification rates were below detection limit. In general, the abundances of the amoA and nirS genes were significantly higher in the bottom samples than the surface ones, and in the high-turbidity river mouth, were distinctly higher in the particle-associated (> 3 μm) than the free-living (0.2 ~ 3 μm) communities. Notably, analysis of correlations between the gene abundances suggested potential gene-based coupling between nitrification and denitrification, especially for the particle-associated assemblages. Statistical analysis of correlations between the community structure, gene abundances and environmental variables further revealed that dissolved oxygen and total suspended material might be the key factors controlling community spatial structure and regulating nitrification and denitrification potentials in the YRE ecosystem." @default.
• W4214545305 created "2022-03-02" @default.
• W4214545305 creator A5016292292 @default.
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• W4214545305 creator A5064724633 @default.
• W4214545305 date "2013-11-15" @default.
• W4214545305 modified "2023-10-18" @default.
• W4214545305 title "Diversity and distribution of <i>amoA</i>-type nitrifying and <i>nirS</i>-type denitrifying microbial communities in the Yangtze River Estuary" @default.
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• W4214545305 doi "https://doi.org/10.5194/bgd-10-17819-2013" @default.
• W4214545305 hasPublicationYear "2013" @default.
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