Denitrification in the Marine Environment

Joye, Samantha B.

doi:10.1002/0471263397.env141

Cited by 8 publications

(13 citation statements)

References 75 publications

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“…In addition, benthic fluxes of NO 3 -and NO 2 -, which were within the range reported for other coastal environments (Berelson et al 1998, Hopkinson et al 2001, Bronk & Steinberg 2008 and references therein), were negatively correlated to bottom water oxygen concentration (component 2). In fact, oxygen strongly affects most of the processes involved in the N cycle, with the exception of organic N mineralization or NH 4 + regeneration, which occurs under both oxic and anoxic conditions (Joye & Anderson 2008). The lower and upper limits for denitrification rates estimated for the study site, assuming that denitrification was the main N 2 -producing process, indicated that on average between 60 and 68% of the nitrogen mineralized was denitrified, respectively.…”

Section: Discussion N Regenerationmentioning

confidence: 91%

“…This has been clearly demonstrated in shallow littoral sediments (< 2 m) that present lower sediment-water NH 4 + fluxes than deeper sediments (Joye & Anderson 2008), suggesting an autotrophic uptake at shallower depths. However, some authors have observed significant benthic primary production rates in continental shelf sediments (e.g.…”

Section: Influence Of Macrofauna On Nutrient Regenerationmentioning

confidence: 82%

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Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Ferrón

Alonso-Pérez²,

Anfuso³

et al. 2009

Mar. Ecol. Prog. Ser.

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Benthic fluxes of nutrients and dissolved nitrous oxide (N 2 O) were determined by benthic chamber incubations in 2 regions on the northeastern near-shore continental shelf of the Gulf of Cádiz (depth range: 8 to 34 m), one off the Guadalquivir River mouth and the other in the Bay of Cádiz and its neighboring shelf. In total, 25 in situ benthic chamber incubations were performed dur- , accounted on average for <1% of total inorganic nitrogen fluxes. The regeneration of NH 4 + and Si(OH) 4 was mainly influenced by organic carbon oxidation rates and bulk organic carbon in surface sediments, whereas HPO 4 2 -regeneration was mostly influenced by bottom water oxygen concentration and water depth. Denitrification was estimated to account for between 9 and 13% of organic matter remineralization and for a loss of between 57 and 67% of potentially recyclable nitrogen. Overall, benthic remineralization was estimated to degrade about 47% of overlying primary production, supplying about 15 and 12% of the phytoplankton N and P requirements, respectively. This highlights the importance of benthic organic matter remineralization on the biogeochemistry of the northeastern continental shelf of the Gulf of Cádiz.

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Section: Discussion N Regenerationmentioning

confidence: 91%

Section: Influence Of Macrofauna On Nutrient Regenerationmentioning

confidence: 82%

Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Ferrón

Alonso-Pérez²,

Anfuso³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…Increasing amounts of nitrous oxide production as a function of nitrate concentrations have been observed in environmental samples and in pure cultures (Sacks and Barker, 1952; Blackmer and Bremner, 1978; Joye, 2002). However Shao et al (2011) recently observed no relationship between extremely high levels of nitrate (80 mM) and N 2 O production.…”

Section: Discussionmentioning

confidence: 99%

“…Denitrification to N 2 often slows substantially or ceases at relatively low sulfide concentrations, and sulfide might be a contributing factor to the observed accumulation of N 2 O in anoxic marine sediments (Sørensen et al, 1978; Joye, 2002). In Guaymas Basin sediments we observed low rates of potential denitrification in the presence of sulfide.…”

Section: Discussionmentioning

confidence: 99%

Denitrification and environmental factors influencing nitrate removal in Guaymas Basin hydrothermally altered sediments

et al. 2012

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We measured potential nitrate removal and denitrification rates in hydrothermally altered sediments inhabited by Beggiatoa mats and adjacent brown oil stained sediments from the Guaymas Basin, Gulf of California. Sediments with Beggiatoa maintained slightly higher rates of potential denitrification than did brown sediments at 31.2 ± 12.1 versus 21.9 ± 1.4 µM N day−1, respectively. In contrast, the nitrate removal rates in brown sediments were higher than those observed in mat-hosting sediments at 418 ± 145 versus 174 ± 74 µM N day−1, respectively. Additional experiments were conducted to assess the responses of denitrifying communities to environmental factors [i.e., nitrate, sulfide, and dissolved organic carbon (DOC) concentration)]. The denitrifying community had a high affinity for nitrate (Km = 137 ± 91 µM NO3−), in comparison to other environmental communities of denitrifiers, and was capable of high maximum rates of denitrification (Vmax = 1164 ± 153 µM N day−1). The presence of sulfide resulted in significantly lower denitrification rates. Microorganisms with the potential to perform denitrification were assessed in these sediments using the bacterial 16S rRNA gene and nitrous oxide reductase (nosZ) functional gene libraries. The bacterial 16S rRNA gene clone library was dominated by Epsilonproteobacteria (38%), some of which (e.g., Sulfurimonas sp.) have a potential for sulfide-dependent denitrification. The nosZ clone library did not contain clones similar to pure culture denitrifiers; these clones were most closely associated with environmental clones.

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“…extreme lack of relevant information. Moreover, peculiarities of the Black Sea condition, where denitrification can be suppressed by S 2-presence (Joye, 2002;Senga et al, 2006) and peak rate is observed at depth of 80-130 m (Yakushev and Neretin, 1997;Murray and Yakushev, 2006), ought to be considered. That is why in that study two variants of N balance were composed, the first based on direct measurements data, the other one -on assessment previously carried out for the whole sea, since denitrification activity seems to be very important for anoxic basins.…”

Section: Denitrificationmentioning

confidence: 99%

Untitled

Medinets¹

2014

Turk. J. Fish. Aquat. Sci.

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To date, most of published nitrogen (N) budget assessments for marine ecosystems (particularly, the Black Sea) are, unfortunately, rather general and incomprehensive due to regular atmospheric load underestimation and frequent neglecting of some relevant N cycling constituents (e.g., N2 fixation rate, dumping, shipping, gaseous emission, chemo denitrification). In this study it has been argued that atmospheric input was systematically underestimated in most of previous assessments of, since organic N constituents were not included. It has been experimentally found that organic part in atmospheric deposition was dominant (~66% or 1777 ± 678 kg N km -2 ) N pollutant constituent, while DIN was ~34% (907 ± 361 kg N km -2 ) only during 2011-2012 campaign. Besides, contributions of water soluble (24.3%) and particulate (28.3%) organic N were distributed approximately equally in atmospheric deposition. Overall, an important role of atmospheric N organic pollutants in deposition, which was neglected before, has been proved. As a results, an average annual atmospheric bulk deposition rate of total N (TN) has been calculated as 2684±316 kg N km -2 based on long-term experimental dataset, thus atmospheric TN load for the whole Black Sea area has been estimated as 1159 ± 136 Gg N.During this study N budget for the Black Sea has been revised and its constituents have been amended. According to presented estimation of N balance the Black Sea is under strong pressure of anthropogenic N load (approximately 798-1692 Gg N y -1 ), mainly from atmosphere and the north-western rivers. Weak understudied points and uncertainties, to which the Black Sea countries' research community should pay attention and focus its efforts immediately, have been highlighted.

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Denitrification in the Marine Environment

Abstract: Denitrification and the Marine Nitrogen Cycle Denitrifying Bacteria General Controls on Denitrification Quantifying Denitrification Rates Locations and Patterns of Denitrification Activity in the Marine Environment

Cited by 8 publications

References 75 publications

Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Benthic nutrient recycling on the northeastern shelf of the Gulf of Cádiz (SW Iberian Peninsula)

Denitrification and environmental factors influencing nitrate removal in Guaymas Basin hydrothermally altered sediments

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