Nitrous oxide sources and sinks in coastal aquifers and coupled estuarine receiving waters

LaMontagne, Michael G.; Duran, Robert; Valiela, Iván

doi:10.1016/s0048-9697(02)00614-9

Cited by 52 publications

(45 citation statements)

References 52 publications

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“…Those organisms belong to the class Gammaproteobacteria, are closely related to pseudomonads from various environments potentially capable of denitrification and found under a specific set of environmental conditions. Overall, our results support conclusions by Koike and Hattori [16] that Pseudomonas-like organisms are capable of consuming nitrous oxide as a part of their energy metabolism and those by LaMontagne et al, Mengis et al, Mei et al, and Schuster and Conrad [17][18][19][20] that those organisms could be ubiquitous in the environment. Our results agree well with those by Conrad [22] as well as Bliecher-Mathiesen and Hoffman [23], who suggested that the organisms responsible for nitrous oxide consumption are likely to be the ones capable of denitrification.…”

Section: Resultssupporting

confidence: 91%

“…Consumption of nitrous oxide by microbes has been described in a variety of natural systems under artificial conditions, with N 2 O gas phase concentration far in excess of atmospheric values [17][18][19][20]. Data of Naqvi et al [21] indicate that N 2 O consumption may also occur in ocean water where high concentrations (up to several hundreds nmol per L) of this compound are found.…”

Section: Introductionmentioning

confidence: 99%

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Enrichment of nitrous oxide reducing bacteria from coastal marsh sediments

Nguyen¹,

Sobolev²

2013

OJE

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We attempted to recover organisms capable of respiratory nitrous oxide reduction with acetate as an electron donor from a variety of coastal marine sediments from Lavaca Bay area, Texas by use of liquid enrichment cultures. Putative positive cultures were analyzed by amplifying eubacterial and archaeal 16S rRNA gene fragments and analyzing their diversity by separating them by a denaturing gradient gel electrophoresis (DGGE). No Archaea was detected in our enrichments; however, positive enrichments from coastal salt marsh indicated the presence of putative nitrous oxide reducing bacteria. DGGE patterns of the amplified DNA were similar between enrichments, with ca. 7 obvious bands. The dominant bands were tentatively identified as members of the Gammaproteobacteria class, closely related to various denitrifying pseudomonads. Our results indicate that coastal marine environments may sustain a nitrous oxide reducing community, although nitrous oxide reduction is probably an opportunistic form of metabolism in that environment.

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Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Enrichment of nitrous oxide reducing bacteria from coastal marsh sediments

Nguyen¹,

Sobolev²

2013

OJE

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“…Denitrification occurs under low oxygen (o6 μmol L À 1 ) to anoxic conditions (Nevison et al, 2003). Denitrification produces and consumes N 2 O in oxygen minimum zones and the net result is that oxygen minimum zones have some of the highest N 2 O concentrations in the ocean (LaMontagne et al, 2003;Naqvi et al, 2010;Zamora et al, 2012;Arévalo-Martínez et al, 2015). In the water column with low oxygen concentrations and in sediments or inside suspended particles, nitrification and denitrification can occur simultaneously and are often closely coupled (Seitzinger, 1988;Ward et al, 1989;Capone, 1991;Middelburg et al, 1996;Barnes and Owens, 1998;Naqvi et al, 1998;Robinson et al, 1998;Usui et al, 2001;Nevison et al, 2003;Codispoti et al, 2005;Bange, 2008).…”

Section: Introductionmentioning

confidence: 99%

Distributions and sea-to-air fluxes of nitrous oxide in the South China Sea and the West Philippines Sea

Tseng

Chen

Borges

et al. 2016

Deep Sea Research Part I: Oceanographic Research Papers

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“…Despite estuaries only representing 0.4 % of the overall area of the ocean, they contribute to approximately 33 % of the estimated oceanic N 2 O emissions (Bange et al 1996;Seitzinger et al 2000). However, it is necessary to validate these global estimates with local and regional measurements as estuarine and coastal waters are subjected to strong seasonal variations and intense eutrophication (Howarth et al 1996;LaMontagne et al 2003;Garnier et al 2006). Furthermore, areas influenced by agriculture and industry may have a relatively higher estuarine and coastal water contribution compared to other areas, due to the use of fertilizers and diverse organic chemicals (Howarth and Paerl 2008).…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution of Nitrous Oxide (N2O) in the Reloncaví Estuary–Sound and Adjacent Sea (41°–43° S), Chilean Patagonia

Yevenes

Bello

Sanhueza-Guevara

2016

Estuaries and Coasts

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Fjords and estuaries exchange large amounts of solutes, gases, and particulates between fluvial and marine systems. These exchanges and their relative distributions of compounds/particles are partially controlled by stratification and water circulation. The spatial and vertical distributions of N 2 O, an important greenhouse gas, along with other oceanographic variables, are analyzed from the Reloncaví estuary (RE) (~41°30′ S) to the gulf of Corcovado in the interior sea of Chiloé (43°45′ S) during the austral winter. Freshwater runoff into the estuary regulated salinity and stratification of the water column, clearly demarking the surface (<5 m depth) and subsurface layer (>5 m depth) and also separating estuarine and marine influenced areas. N 2 O levels varied between 8.3 and 21 nM (corresponding to 80 and 170 % saturation, respectively), being significantly lower (11.8 ± 1.70) at the surface than in subsurface waters in the Reloncaví estuary (14.5 ± 1.73). Low salinity and NO 3 − , NO 2 − , and PO 4 3− levels, as well as high Si(OH) 4 values were associated with low surface N 2 O levels. Remarkably, an accumulation of N 2 O was observed in the subsurface waters of the Reloncaví sound, associated with a relatively high consumption of O 2 . The sound is exposed to increasing anthropogenic impacts from aquaculture and urban discharge, occurring simultaneously with an internal recirculation, which leads to potential signals of early eutrophication. In contrast, within the interior sea of Chiloé (ISC), most of water column was quasi homohaline and occupied by modified subantarctic water (MSAAW), which was relatively rich in N 2 O (12.6 ± 2.36 nM) and NO 3 − (18.3 ± 1.63 μM). The relationship between salinity, nutrients, and N 2 O revealed that water from the open ocean, entering into ISC (the Gulf of Corcovado) through the Guafo mouth, was the main source of N 2 O (up to 21 nM), as it gradually mixed with estuarine water. In addition, significant relationships between N 2 O excess vs. AOU and N 2 O excess vs. NO 3 − suggest that part of N 2 O is also produced by nitrification. Our results show that the estuarine and marine waters can act as light source or sink of N 2 O to the atmosphere (air-sea N 2 O fluxes ranged from −1.57 to 5.75 μmol m −2 day −1 ), respectively; influxes seem to be associated to brackish water depleted in N 2 O that also caused a strong stratification, creating a barrier to gas exchange.

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Nitrous oxide sources and sinks in coastal aquifers and coupled estuarine receiving waters

Cited by 52 publications

References 52 publications

Enrichment of nitrous oxide reducing bacteria from coastal marsh sediments

Enrichment of nitrous oxide reducing bacteria from coastal marsh sediments

Distributions and sea-to-air fluxes of nitrous oxide in the South China Sea and the West Philippines Sea

Spatial Distribution of Nitrous Oxide (N2O) in the Reloncaví Estuary–Sound and Adjacent Sea (41°–43° S), Chilean Patagonia

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