Impact of trace metals on denitrification in estuarine sediments of the Douro River estuary, Portugal

Magalhães, Catarina; Costa, Joana; Teixeira, Catarina; Bordalo, Adriano A.

doi:10.1016/j.marchem.2007.02.005

Cited by 76 publications

(58 citation statements)

References 48 publications

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“…2 and 3A), as compared with only 1% normally observed in aquatic sediments (15,16). However, similarly high N 2 O-to-N 2 ratios have been reported from pure cultures (17) and soils (18) after sudden shifts from oxic to anoxic conditions, and from earthworms ingesting oxic soil into their anoxic guts (19).…”

Section: Grazersmentioning

confidence: 59%

Nitrous oxide emission by aquatic macrofauna

Stief¹,

Poulsen²,

Nielsen³

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

139

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A large variety of aquatic animals was found to emit the potent greenhouse gas nitrous oxide when nitrate was present in the environment. The emission was ascribed to denitrification by ingested bacteria in the anoxic animal gut, and the exceptionally high N2O-to-N2 production ratio suggested delayed induction of the last step of denitrification. Filter-and deposit-feeding animal species showed the highest rates of nitrous oxide emission and predators the lowest, probably reflecting the different amounts of denitrifying bacteria in the diet. We estimate that nitrous oxide emission by aquatic animals is quantitatively important in nitraterich aquatic environments like freshwater, coastal marine, and deep-sea ecosystems. The contribution of this source to overall nitrous oxide emission from aquatic environments might further increase because of the projected increase of nitrate availability in tropical regions and the numeric dominance of filter-and depositfeeders in eutrophic ecosystems.aquatic animals ͉ eutrophication ͉ sediment ͉ gut microbiology ͉ denitrification

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Section: Grazersmentioning

confidence: 59%

Nitrous oxide emission by aquatic macrofauna

Stief¹,

Poulsen²,

Nielsen³

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

139

View full text Add to dashboard Cite

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“…coupled nitrification-denitrification) or the water column (Jenkins & Kemp 1984). Sedimentary denitrification is commonly assumed to be the major source of N 2 O to the water column, with benthic N 2 O fluxes making up approximately 1% of the dinitrogen fluxes (Seitzinger 1988, Magalhaes et al 2007, Ferrón et al 2009). Sedimentary nitrification can, despite lower N 2 O production rates, significantly contribute to benthic N 2 O fluxes, due to its proximity to the sediment surface (Meyer et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide production associated with coastal marine invertebrates

Heisterkamp¹,

Schramm²,

Beer³

et al. 2010

Mar. Ecol. Prog. Ser.

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“…Among the various heavy metals, arsenic and cadmium had the highest concentrations and posed the greatest toxicity threat in the experimental riparian zones in the PRD urban area. In addition to microbial toxicity effects, lower concentrations of heavy metals (e.g., Cu, Pb, As, Cd) have been shown to increase the activity of denitrifying enzymes while high heavy metal concentrations inhibited denitrifying enzyme activities so that the concentration of ammonium in the sediment-water environment may increase and the removal of nitrate may be reduced or even enhance the release of N 2 O (Magalhaes et al 2007;Sakadevan et al 1999). Based on the regression results shown in Table 7, most heavy metals (except for As) were inversely related with CH 4 emission, suggesting a potential inhibition of methane producing pathways.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal variability in nitrous oxide and methane emissions in urban riparian zones of the Pearl River Delta

Zhang

Huang

Yang

et al. 2015

Environ Sci Pollut Res

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Spatial and temporal variability in nitrous oxide and methane emissions were quantified in three seasons using closed chambers in three riparian zone locations of three branches of the Pearl River, Guangzhou, China. The sampling sites were selected in a rapidly developing urban area of Guangzhou and represented a pollution gradient. The results show that urban riparian landscapes can be large source areas for CH 4 and N 2 O, with fluxes of −0.035 ∼ 32.30 mg m −2 h −1 and −5.49 ∼ 37.31 μg m −2 h −1 , respectively. River water quality, sediment texture, and NH 4 -N and NO 3 -N concentrations correlated with N 2 O and CH 4 emission rates. The riparian zones of the more seriously polluted tributaries showed higher greenhouse gas fluxes than that of the less polluted main stem of the Pearl River. Rain events increased emissions of CH 4 by 6.5∼21.3 times and N 2 O by 2.2∼5.7 times. The lower concentrations of heavy metals increased the activity of denitrifying enzymes while inhibited the methane producing pathways. This work demonstrates that rapidly developing urban areas are an important source of greenhouse gas emissions, which is conditioned by various environmental factors.

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Impact of trace metals on denitrification in estuarine sediments of the Douro River estuary, Portugal

Cited by 76 publications

References 48 publications

Nitrous oxide emission by aquatic macrofauna

Nitrous oxide emission by aquatic macrofauna

Nitrous oxide production associated with coastal marine invertebrates

Spatial and temporal variability in nitrous oxide and methane emissions in urban riparian zones of the Pearl River Delta

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