Ubiquitous anaerobic ammonium oxidation in inland waters of China: an overlooked nitrous oxide mitigation process

Zhu, Guibing; Wang, Shanyun; Zhou, Leiliu; Wang, Yu; Zhao, Shuai; Xia, Chao; Wei-dong, Wang; Zhou, Rong; Wang, Chaoxu; Jetten, Mike S. M.; Hefting, Mariet M.; Yin, Chengqing; Qu, Jiuhui

doi:10.1038/srep17306

Cited by 49 publications

(25 citation statements)

References 53 publications

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“…High variability was also observed in a study of potential anammox rates in the water column of Sandusky Bay and Lake Erie (Lu et al, 2018). Marked variability may be characteristic of anammox activity in freshwater environments, even across small spatial and temporal scales (Yoshinaga et al, 2011;Zhu et al, 2013Zhu et al, , 2015. Anammox made up an average of 14 % of sediment N removal across the sampling period, indicating that anammox activity in Sandusky Bay may be typical of shallow estuarine and freshwater systems (Thamdrup and Dalsgaard, 2002;Dalsgaard et al, 2005;Schubert et al, 2006;Dong et al, 2009;Hsu and Kao, 2013;McCarthy et al, 2016).…”

Section: N Removal Processesmentioning

confidence: 81%

Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

Salk¹,

Bullerjahn²,

McKay³

et al. 2018

Biogeosciences

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Abstract. Recent global water quality crises point to an urgent need for greater understanding of cyanobacterial harmful algal blooms (cHABs) and their drivers. Nearshore areas of Lake Erie such as Sandusky Bay may become seasonally limited by nitrogen (N) and are characterized by distinct cHAB compositions (i.e., Planktothrix over Microcystis). This study investigated phytoplankton N uptake pathways, determined drivers of N depletion, and characterized the N budget in Sandusky Bay. Nitrate (NO − 3 ) and ammonium (NH + 4 ) uptake, N fixation, and N removal processes were quantified by stable isotopic approaches. Dissimilatory N reduction was a relatively modest N sink, with denitrification, anammox, and N 2 O production accounting for 84, 14, and 2 % of sediment N removal, respectively. Phytoplankton assimilation was the dominant N uptake mechanism, and NO − 3 uptake rates were higher than NH + 4 uptake rates. Riverine N loading was sometimes insufficient to meet assimilatory and dissimilatory demands, but N fixation alleviated this deficit. N fixation made up 23.7-85.4 % of total phytoplankton N acquisition and indirectly supports Planktothrix blooms. However, N fixation rates were surprisingly uncorrelated with NO − 3 or NH + 4 concentrations. Owing to temporal separation in sources and sinks of N to Lake Erie, Sandusky Bay oscillates between a conduit and a filter of downstream N loading to Lake Erie, delivering extensively recycled forms of N during periods of low export. Drowned river mouths such as Sandusky Bay are mediators of downstream N loading, but climate-change-induced increases in precipitation and N loading will likely intensify N export from these systems.

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Section: N Removal Processesmentioning

confidence: 81%

Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

Salk¹,

Bullerjahn²,

McKay³

et al. 2018

Biogeosciences

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“…In marine systems, it may be responsible for up to 50% of the marine N loss1011, with hotspots occurring in oxygen minimum zones (OMZ)121314. Anammox has also been detected in many freshwater systems with hotspots occurring in riparian sediments15161718. Overall, the available data indicates that anammox may be present in many environments, including surface aquatic ecosystems, and that anammox may be responsible for a significant proportion of N 2 production.…”

mentioning

confidence: 99%

Nitrogen loss by anaerobic ammonium oxidation in unconfined aquifer soils

Wang

Radny

Huang

et al. 2017

Sci Rep

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Anaerobic ammonium oxidation (anammox) is recognized as an important process for nitrogen cycling, yet little is known about its role in the subsurface biosphere. In this study, we investigated the presence, abundance, and role of anammox bacteria in upland soil cores from Tianjin, China (20 m depth) and Basel, Switzerland (10 m depth), using isotope-tracing techniques, (q)PCR assays, and 16 S rRNA & hzsB gene clone libraries, along with nutrient profiles of soil core samples. Anammox in the phreatic (water-saturated) zone contributed to 37.5–67.6% of the N-loss (up to 0.675 gN m−2 d−1), with anammox activities of 0.005–0.74 nmolN g−1 soil h−1, which were even higher than the denitrification rates. By contrast, no significant anammox was measured in the vadose zone. Higher anammox bacterial cell densities were observed (0.75–1.4 × 107 copies g−1 soil) in the phreatic zone, where ammonia-oxidizing bacteria (AOB) maybe the major source of nitrite for anammox bacteria. The anammox bacterial cells in soils of the vadose zone were all <103 copies g−1 soil. We suggest that the subsurface provides a favorable niche for anammox bacteria whose contribution to N cycling and groundwater nitrate removal seems considerably larger than previously known.

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“…Above the line, the reaction is thermodynamically feasible (minimum energy not taken into consideration). Shaded areas and dots in different colors reflect field data with the occurrence of anammox taken from previous literatures (Zhu et al 2015;Schmid et al 2007;Dale et al 2009;Jaeschke et al 2007;Rich et al 2008;Hamersley et al 2009;Jaeschke et al 2009a, b;Engstrom et al 2009) ( 24) chelated Fe(III) may have the potential to play a role in feammox in the nature. But, evidence remains to be provided whether and to which extent chelated Fe(III) in the nature can drive anaerobic ammonia oxidation.…”

Section: Feammoxmentioning

confidence: 95%

“…Anammox is thermodynamically favorable at typical environments, such as marine sediments, freshwater sediments, and paddy soils, where the concentrations of both NH 4 + and NO 3 − /NO 2 − are much higher than the minimum requirement for the anammox reaction (Fig. 3) (Hamersley et al 2009;Rich et al 2008;Zhu et al 2015). Anammox in natural environments was first observed in sediments from the BalticNorth Sea transition (Dalsgaard and Thamdrup 2002).…”

Section: Anammoxmentioning

confidence: 99%

“…It was surprising that anammox contributed to 24~67% of the total N 2 production in continental shelf sediments, whereas the remainder was related to denitrification (Dalsgaard and Thamdrup 2002). Besides the common marine ecosystem, anammox also occurred in fresh water and terrestrial ecosystems (Zhu et al 2015), especially in the suboxic water layer in a lacustrine system, like Lake Tanganyika, where anammox rates was up to 10 nM N 2 / h, comparable to the marine water column (Schubert et al 2006). The anammox reaction was estimated to contribute to 19~35 and 19% of total N 2 production in anoxic water column of Golfo Dulce, Costa Rica and in ice floe from the Greenland respectively (Dalsgaard et al 2003;Rysgaard and Glud 2004).…”

Section: Anammoxmentioning

confidence: 99%

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Thermodynamic energy of anaerobic microbial redox reactions couples elemental biogeochemical cycles

2017

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Purpose The thermodynamic energy of redox reactions affects the distribution of microbial redox reactions and cyclic transformation of elements in various anaerobic ecosystems. The principle of thermodynamics is of dramatic significance in understanding the energetics of metabolic processes, the biogeochemical behavior of microorganisms, and mass and energy cycles. The purpose of this paper is to relate the distribution of the coupling reactions between C, N, Fe, and S, the most important elements involved in microbially mediated redox reactions, with their thermodynamic feasibility to provide theoretical foundation of their occurrence. Results and discussion Anaerobic microorganisms catalyze diverse redox reactions in anoxic environments, driving elemental biogeochemical cycles on the earth. They capture energy from catalyzing these redox reactions in order to support life. The thermodynamic feasibility of these microbe-driven redox reactions is controlled by their energy yields which depend on environmental conditions. Anaerobic microorganisms can oxidize organic carbon with diverse inorganic compounds including nitrate/nitrite, ferric iron, and sulfate as electron acceptors in various anoxic environments which is referred to anaerobic respiration of organic matter; reversely, inorganic carbon can be reduced to synthesize cell material with ferrous iron and sulfide as an alternative electron donor by phototrophs under different sets of circumstances. Nitrate/nitrate can be microbically reduced by inorganic compounds such as ferrous iron and sulfide under some specific situations; the coupling of anaerobic anammox oxidation and reduction of nitrite (anammox), ferric iron (feammox), and sulfate (suramox) driven by anaerobes occurs in other particular systems. Conclusions and perspectives Although there are increasing researches investigating the anaerobe-driven coupling of pairs of elements such as C-N, C-Fe, C-S, N-Fe, N-S, and Fe-S, much more intricate situations associating the coupling of multiple elements are still not comprehensively understood. A great many reactions which are thermodynamically feasible have not yet been identified in natural environments or laboratories. Further work focusing on the metabolic pathways from a genetic and enzymatic perspective and the factors controlling the feasibility of the reactions by using updated technical tools and methods is required.

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Ubiquitous anaerobic ammonium oxidation in inland waters of China: an overlooked nitrous oxide mitigation process

Cited by 49 publications

References 53 publications

Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

Nitrogen cycling in Sandusky Bay, Lake Erie: oscillations between strong and weak export and implications for harmful algal blooms

Nitrogen loss by anaerobic ammonium oxidation in unconfined aquifer soils

Thermodynamic energy of anaerobic microbial redox reactions couples elemental biogeochemical cycles

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