Increased rates of dissimilatory nitrate reduction to ammonium (DNRA) under oxic conditions in a periodically hypoxic estuary

Roberts, Keryn L.; Kessler, Adam J.; Grace, Mike; Cook, Perran

doi:10.1016/j.gca.2014.02.042

Cited by 117 publications

(82 citation statements)

References 48 publications

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“…From this alone, it is not possible to ascribe any contribution of each term to either of denitrification or DNRA. Conversely, DNRA driven by Fe 2+ has recently been shown in the Yarra River estuary (YAR) (Roberts et al, 2014;Robertson et al, 2016) and similar biogeochemistry has been observed in freshwater environments (Robertson & Thamdrup, 2017). Fe 2+ may inhibit denitrification (Carlson et al, 2012), accounting for the decrease in D 15 /DNRA 15 with Fe 2+ .…”

Section: Slice-specific Rates Of D 15 and Dnra 15mentioning

confidence: 63%

Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries

Kessler

Roberts

Bissett

et al. 2018

Global Biogeochemical Cycles

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The balance between estuarine denitrification and dissimilatory nitrate reduction to ammonium (DNRA) is critical for determining nitrogen loads received by oceans from inland waters. We aimed to determine the factors controlling the ratio between these processes and determining whether nitrogen was generally removed or recycled in estuaries. Rates of denitrification and DNRA with depth were measured in intact sediment cores in 11 estuaries along the coast of Victoria, Australia. The estuaries studied represent a range of biogeochemical conditions, land use, and catchment size. At a pore water profile scale, the ratio of denitrification to DNRA was well predicted by a multiple regression model with nitrate concentration in the overlying water, dissolved pore water iron, and ammonium as the predictor variables. Areal denitrification rates varied from 4 to 150 μmol · m−2 · hr−1, and DNRA rates varied from 2 to 30 μmol · m−2 · hr−1, with the ratio of denitrification to DNRA spanning a range from denitrification‐dominated (denitrification/DNRA = 8.4) to DNRA‐dominated (denitrification/DNRA = 0.3). DNRA dominated at sites with high iron pools and high organic carbon to nitrate ratios. We conclude that low nitrate and high Fe2+ availability generally enhances DNRA and drives an estuary toward being N recycling, rather than N removing.

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Section: Slice-specific Rates Of D 15 and Dnra 15mentioning

confidence: 63%

Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries

Kessler

Roberts

Bissett

et al. 2018

Global Biogeochemical Cycles

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“…In this study no significant negative correlation between Dn rates and NH 4 fluxes, which could indicate substitution of one with another, was observed. Furthermore, recent findings by Roberts et al (2014) indicate that DNRA is much more effective under oxygen saturation than oxygen deficit conditions. This leads to the conclusion that in the project area the DNRA is not of importance and seasonally occurring increase of NH 4 fluxes primarily should be attributed to the inhibition of nitrification due to limited availability of oxygen.…”

Section: Discussionmentioning

confidence: 97%

Biogeochemistry of N, P and SI in the Gulf of Riga surface sediments: Implications of seasonally changing factors

Aigars

Poikāne

Dalsgaard

et al. 2015

Continental Shelf Research

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“…These very specific biochemical limitations are out of the scope of our modelling approach, and for this, the presence of N 2 O denitrification cannot be predicted. Dissimilatory nitrite and nitrate reductions are also not predicted as successful metabolisms (even if NH 4 + feeding is stopped, data not shown) despite the fact that they have been reported where electron donors other than organic matter (for example, H 2 S) (An and Gardner, 2002) and/or specific environmental conditions (Roberts et al, 2014) are present.…”

Section: Inorganic Nitrogen Oxidation-reductionmentioning

confidence: 94%

Microbial catabolic activities are naturally selected by metabolic energy harvest rate

González-Cabaleiro

Ofiţeru²,

Lema

et al. 2015

The ISME Journal

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The fundamental trade-off between yield and rate of energy harvest per unit of substrate has been largely discussed as a main characteristic for microbial established cooperation or competition. In this study, this point is addressed by developing a generalized model that simulates competition between existing and not experimentally reported microbial catabolic activities defined only based on well-known biochemical pathways. No specific microbial physiological adaptations are considered, growth yield is calculated coupled to catabolism energetics and a common maximum biomassspecific catabolism rate (expressed as electron transfer rate) is assumed for all microbial groups. Under this approach, successful microbial metabolisms are predicted in line with experimental observations under the hypothesis of maximum energy harvest rate. Two microbial ecosystems, typically found in wastewater treatment plants, are simulated, namely: (i) the anaerobic fermentation of glucose and (ii) the oxidation and reduction of nitrogen under aerobic autotrophic (nitrification) and anoxic heterotrophic and autotrophic (denitrification) conditions. The experimentally observed cross feeding in glucose fermentation, through multiple intermediate fermentation pathways, towards ultimately methane and carbon dioxide is predicted. Analogously, two-stage nitrification (by ammonium and nitrite oxidizers) is predicted as prevailing over nitrification in one stage. Conversely, denitrification is predicted in one stage (by denitrifiers) as well as anammox (anaerobic ammonium oxidation). The model results suggest that these observations are a direct consequence of the different energy yields per electron transferred at the different steps of the pathways. Overall, our results theoretically support the hypothesis that successful microbial catabolic activities are selected by an overall maximum energy harvest rate.

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Increased rates of dissimilatory nitrate reduction to ammonium (DNRA) under oxic conditions in a periodically hypoxic estuary

Cited by 117 publications

References 48 publications

Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries

Biogeochemical Controls on the Relative Importance of Denitrification and Dissimilatory Nitrate Reduction to Ammonium in Estuaries

Biogeochemistry of N, P and SI in the Gulf of Riga surface sediments: Implications of seasonally changing factors

Microbial catabolic activities are naturally selected by metabolic energy harvest rate

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