Effect of organic enrichment and thermal regime on denitrification and dissimilatory nitrate reduction to ammonium (DNRA) in hypolimnetic sediments of two lowland lakes

Nizzoli, Daniele; Carraro, Elisa; Nigro, Valentina; Viaroli, Pierluigi

doi:10.1016/j.watres.2010.02.002

Cited by 128 publications

(90 citation statements)

References 44 publications

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“…Our results range from 0 to12% at the inflow stream ecotype to 6 to 99% at the lake ecotype and overlap with global freshwater data (Freshwater lakes: Nijburg & Laanbroek 1997b, Nizzoli et al 2010 wetlands: Ambus et al 1992, Scott et al 2008 streams: Kelso et al 1999, Omnes et al 1996 Fig. 6).…”

Section: Global Comparisonssupporting

confidence: 84%

“…DNRA was only measured at Lake Waco wetlands in Texas during the summer months when temperatures averaged 28.6°C, as compared to a winter average of 8.4°C (Scott et al 2008). Nizzoli et al (2010) found that DNRA was appreciably higher in Lake Verde in summer samples (13°C) compared with the winter (5°C). However, modeled DNRA was favored in more extreme temperatures (<14°C and >17°C) whereas denitrifying microbes preferred a narrow range of 14 to 17°C (Kelly-Gerreyn et al 2001).…”

mentioning

confidence: 86%

“…Other possible contributing factors include the presence of macrophytes (Nijburg & Laanbroek 1997a,b) and ambient temperature (Ogilvie et al 1997, Scott et al 2008, Nizzoli et al 2010.…”

Section: Resale or Republication Not Permitted Without Written Consenmentioning

confidence: 99%

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Dissimilatory nitrate reduction pathways in an oligotrophic freshwater ecosystem: spatial and temporal trends

Washbourne¹,

Crenshaw²,

Baker³

2011

Aquat. Microb. Ecol.

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Elevated nitrate (NO 3 − ) concentrations can cause eutrophication, which may lead to harmful algal blooms, loss of habitat and reduction in biodiversity. Denitrification, a dissimilatory process that removes NO 3 − mainly as dinitrogen gas (N 2 ), is believed to be the dominant NO 3 − removal pathway in aquatic ecosystems. Evidence suggests that a less well-studied process, dissimilatory nitrate reduction to ammonium (DNRA), which retains nitrogen (N) in the system, may also be important under favorable conditions. Using stable isotope tracers in sealed microcosms, we measured the potential for NO 3 − losses due to DNRA and denitrification in an oligotrophic freshwater ecosystem. We took sediment and water samples at runoff and baseflow, across several ecotypes. Our objective was to quantify the relative importance of DNRA compared to denitrification with changes in ecotype and season. Potential denitrification rates ranged from 0 to 0.14 ± 0.03 µgN gAFDM −1 d −1. Potential DNRA rates ranged from 0 to 0.0051 ± 0.0008 µgN gAFDM −1 d −1. Denitrification losses peaked at the inflow stream ecotype at 96.2% of total dissimilatory NO 3 − removal, whereas losses due to DNRA peaked in the lake ecotype at 34.4%. When averaged over the entire system, denitrification peaked at baseflow (31.2%), while DNRA peaked at runoff (2.9%). Although NO 3 − transformations due to denitrification were higher than DNRA in all ecotype and temporal comparisons, our results suggest that DNRA is also important under favorable conditions. KEY WORDS: DNRA · Denitrification · Nitrogen transformations · Ecotype · Season Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 65: [55][56][57][58][59][60][61][62][63][64] 2011 finally N 2 (Ye et al. 1995). The final reduction products, nitrous oxide (N 2 O), a potent greenhouse gas (Ramaswamy et al. 2001), and dinitrogen gas (N 2 ), are lost from the system into the atmosphere (Delwiche & Bryan 1976). In the presence of O 2 , most denitrifying bacteria will switch to the physiologically preferred process of aerobic respiration at the expense of NO 3 − reduction. (Megonigal et al. 2004). Denitrification may be diminished by the presence of free sulfides, which can inhibit the enzymes responsible for the final 2 stages of the process (Burgin & Hamilton 2007).DNRA is a microbial process that transforms NO 3 − to ammonium (NH 4 + ) via formation of NO 2 − in anaerobic or low O 2 environments. The final N form, NH 4 + , is bioavailable and readily immobilized by microbes and plants, or transformed by nitrification (Bengtsson et al. 2003). There are 2 DNRA pathways; fermentative and chemolithoautotrophic. Fermentative DNRA microbes reduce NO 3 − to NO 2 − to produce ATP. The subsequent reduction of NO 2 − to NH 4 + is an electron sink that allows re-oxidation of NADH (Tiedje 1988). Chemolithoautotrophic DNRA is the transformation of NO 3 − to NH 4 + , linked to oxidation of reduced sulfur (S) compounds. This sulfur-driven NO 3 − reduction leads to ...

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Section: Global Comparisonssupporting

confidence: 84%

mentioning

confidence: 86%

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Dissimilatory nitrate reduction pathways in an oligotrophic freshwater ecosystem: spatial and temporal trends

Washbourne¹,

Crenshaw²,

Baker³

2011

Aquat. Microb. Ecol.

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“…Because the DNRA was not nitrate-limited, and the IPT calculation formulas could not be applied in all seasons due to lack of NO 3 -limitation in denitrification, we used the calculation scheme of Dong et al (2009). The DNRA rates measured were comparable to those in 2 lowland lakes (Nizzoli et al 2010) and a wetland (Scott et al 2008), but were at least 10-fold lower in comparison to marine sediments (Jørgensen 1989, Rysgaard et al 1996. High rates of DNRA have been reported from sediments that have high concentrations of sulfide and/or a high organic content, causing a low redox potential (Burgin & Hamilton 2007), and a negative correlation between O 2 concentration and DNRA rates was also found in the present study.…”

Section: Discussionmentioning

confidence: 99%

Seasonal variation in nitrification and nitrate-reduction pathways in coastal sediments in the Gulf of Finland, Baltic Sea

Jäntti¹,

Stange²,

Leskinen³

et al. 2011

Aquat. Microb. Ecol.

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“…Data on denitrification rates, nitrate and oxygen concentrations and temperature in the water overlying the sediment, as well as the average area-specific N load rates, were obtained for 10 previously studied small to medium-sized lakes, located in the boreal and temperate zone in Europe (Ahlgren et al 1994, Mengis et al 1997, Risgaard-Petersen et al 1999, Friedrich et al 2003, Nizzoli et al 2010, Holmroos et al 2012 (Fig. 1, see Table S1 in the supplement at www.…”

Section: Regional (Boreal Zone) and Continental (Boreal And Temperatementioning

confidence: 99%

Interlake variation and environmental controls of denitrification across different geographical scales

Rissanen¹,

Tiirola²,

Hietanen³

et al. 2013

Aquat. Microb. Ecol.

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Denitrification in lakes significantly reduces the nitrogen (N) load from land to oceans, but the factors controlling it remain poorly understood. Therefore, interlake variation of denitrification in sediments of small to medium-sized lakes (from 0.03 to 17.8 km 2 ) was studied across different geographical scales. At the local scale, the denitrification rates and sediment microbial communities were studied in 4 boreal lakes in close proximity (within 20 km) using the isotope pairing technique (IPT) and molecular methods. These local scale data were combined with previously published data on denitrification rates from 10 other European lakes to extend the analysis to the regional (boreal area) and continental (boreal and temperate areas) scales. Denitrification varied considerably among lakes, ranging from ~50 to ~600, ~0 to ~600 and ~0 to ~12900 µmol N m −2 d −1at the local, regional and continental scales, respectively. This variation was primarily due to nitrate availability. The structure of the denitrifier community studied at the local scale was independent of the denitrification rates but varied among lakes correlating with nitrate availability and sediment organic content. Removal of nitrate and total N load by denitrification was less efficient in boreal than in temperate lakes. In addition, a meta-analysis of published N mass balance data indicates that the total N retention (denitrification + N sedimentation) is less efficient in boreal than in temperate lakes. Anaerobic ammonium oxidation (anammox) was studied at the local scale but was not detected, although (based on molecular markers) several anammox genera were present in the sediments.KEY WORDS: Denitrification · Lake · Sediment · nirK Resale or republication not permitted without written consent of the publisherRemoval of nitrate and total N load by denitrification was less efficient in boreal than in temperate lakes. Photos: Ilpo Hakala (boreal) and Thyes (temperate)Aquat Microb Ecol 69: [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] 2013

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Effect of organic enrichment and thermal regime on denitrification and dissimilatory nitrate reduction to ammonium (DNRA) in hypolimnetic sediments of two lowland lakes

Cited by 128 publications

References 44 publications

Dissimilatory nitrate reduction pathways in an oligotrophic freshwater ecosystem: spatial and temporal trends

Dissimilatory nitrate reduction pathways in an oligotrophic freshwater ecosystem: spatial and temporal trends

Seasonal variation in nitrification and nitrate-reduction pathways in coastal sediments in the Gulf of Finland, Baltic Sea

Interlake variation and environmental controls of denitrification across different geographical scales

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