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• W4306179923 endingPage "114593" @default.
• W4306179923 startingPage "114593" @default.
• W4306179923 abstract "Aquaculture can substantially alter the accumulation and cycling of nutrients in sediments. However, the microbial mechanisms mediating sediment dissimilatory nitrate (NO3−) reduction in freshwater aquaculture ponds are still unclear, which rule the removal and retention of N element. In the present study, three microbial NO3− reduction processes in riparian aquaculture pond sediments (i.e., crab, shrimp and fish ponds) and natural freshwater sediments (i.e., lakes and rivers) were investigated via isotopic tracing and molecular analyses. The potential rates of denitrification, anaerobic ammonium oxidation (anammox) and dissimilatory nitrate reduction to ammonium (DNRA) significantly increased in the aquaculture ponds compared with the natural freshwaters. Denitrification contributed 90.40–94.22% to the total NO3− reduction (product as N2), followed by 2.49–5.82% of anammox (product as N2) and 2.09–5.18% of DRNA (product as NH4+). The availability of C and N substrates, rather than functional gene abundance, regulated the activities of NO3− reductions and microbiome composition. Microbial mechanism based on network analysis indicated that heterotrophic denitrifiers and DNRA bacteria (e.g., Bacillus, Micromonospora, Mycobacterium and Brachybacterium) determined the community structure and function for N conversions in aquaculture ponds, whereas the such microbial network in natural freshwater sediments was manipulated by autotrophic denitrifiers (e.g., Desulfuromonas, Polaromonas, Solitalea). Collectively, this study provides an in-depth exploration of microbial nitrogen removal in freshwater aquaculture areas and supports management strategies for N pollution caused by reclamation for aquaculture in riparian zones." @default.
• W4306179923 created "2022-10-14" @default.
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• W4306179923 date "2023-01-01" @default.
• W4306179923 modified "2023-10-18" @default.
• W4306179923 title "Insights into microbial interactive mechanism regulating dissimilatory nitrate reduction processes in riparian freshwater aquaculture sediments" @default.
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• W4306179923 doi "https://doi.org/10.1016/j.envres.2022.114593" @default.
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