Nitrogen cycling in a deep ocean margin sediment (Sagami Bay, Japan)

Glud, Ronnie N.; Thamdrup, Bo; Ståhl, Henrik; Wenzhoefer, Frank; Glud, Anni; Nomaki, Hidetaka; Oguri, Kazuta; Revsbech, Niels Peter; Kitazato, Hiroshi

doi:10.4319/lo.2009.54.3.0723

Cited by 94 publications

(105 citation statements)

References 56 publications

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“…Similar data for sediments underlying oxygen deficient environments are scarce, yet Glud et al (2009) reported that anammox contributed 37 % to the total N 2 production in the hypoxic Sagami Bay in Japan (55 -60 µM O 2 ). In contrast to the absolute anammox rates, the relative importance of anammox in N 2 production increased with water depth from station 4 to 6 (Table 5).…”

Section: Relative Importance Of Denitrification Dnra and Anammox Inmentioning

confidence: 49%

“…Rate measurements are scarce, but those which do exist generally support this idea (Berelson et al, 1987;Devol and Christensen, 1993;Hartnett and Devol, 2003;Glud et al, 2009;Schwartz et al, 2009;Woulds et al, 2009). A recent study along 11 °S within the Peruvian OMZ (Sommer et al, submitted) showed the sediments were a sink for DIN on the continental slope at water depths with low dissolved O 2 .…”

Section: Introductionmentioning

confidence: 95%

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Benthic nitrogen cycling traversing the Peruvian oxygen minimum zone

Bohlen

Dale

Sommer

et al. 2011

Geochimica et Cosmochimica Acta

103

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Section: Relative Importance Of Denitrification Dnra and Anammox Inmentioning

confidence: 49%

Section: Introductionmentioning

confidence: 95%

Benthic nitrogen cycling traversing the Peruvian oxygen minimum zone

Bohlen

Dale

Sommer

et al. 2011

Geochimica et Cosmochimica Acta

103

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“…However, extraction of relatively high amounts (> 250 mM) of intracellular nitrate from living G. turgida was possible in all 3 treatments (Fig. 4) Glud et al (2009). Similar intracellular nitrate concentrations (up to 500 mM) have also been observed in white sulphur bacteria belonging to the family Beggiatoaceae (Beggiatoa, Thioploca and Thiomargarita;Fossing et al 1995, McHatton et al 1996, Schulz et al 1999, Sayama 2001), corresponding to 4000-fold higher concentration levels than in the ambient environment.…”

Section: Nitrate Storage In Foraminiferamentioning

confidence: 77%

Survival and life strategy of the foraminiferan Globobulimina turgida through nitrate storage and denitrification

Piña-Ochoa¹,

Koho²,

Geslin³

et al. 2010

Mar. Ecol. Prog. Ser.

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In a laboratory experiment, we examined the prolonged survival and behaviour of the benthic foraminiferan Globobulimina turgida under 3 simulated natural conditions: oxygenated with added nitrate, anoxic with added nitrate, and anoxic. The survival rates, adenosine triphosphate (ATP) reserve and intracellular nitrate pool of G. turgida were measured periodically under these conditions. Furthermore, to evaluate the efficiency and energy yield of the respiration system, denitrification rates of individual specimens were quantified using the acetylene inhibition and N 2 O microsensor technique at the start of the experiment. Our results demonstrate that the long-term (56 d) survival rate (64%) and ATP concentrations of G. turgida were not significantly different in oxygenated and anoxic, nitrate-containing conditions (Mann-Whitney test, p > 0.05). Thus, G. turgida can survive prolonged anoxia (3 mo) as long as nitrate is available to sustain its respiration. However, it remains unsure whether growth or reproduction can take place under anoxia. Short-term (21 to 35 d) survival rates were lower in nitrate-free, anoxic conditions (22% recovered alive compared to 62 to 82% in nitrate-oxic or nitrate-anoxic conditions), but foraminifera were observed to survive up to 56 d if respiring from their intra-cellular nitrate pool only. The foraminiferal nitrate pool appears very dynamic, as wide ranges of concentrations were measured in living specimens (0 to 463 mM ind.-1 ). We postulate that the scatter in the nitrate pool measurements highlights the ability of the foraminifera to actively collect and respire on nitrate, depending on individuals' history of exposure to oxygen and nitrate.

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“…However, in some instances the spatial resolutions in the DBL was insufficient for applying this procedure and in other instances we wanted to calculate fluxes below the sediment surface. For instance, this was the case when deriving the nitrification rate in the oxic surface layer, where the upward and downward flux from the concentration peak was calculated, the first representing an efflux to the overlying water and the latter sustaining underlying denitrification (Glud et al 2009b). In those instances, we applied the concentration gradient in the sediment and the tortuosity corrected molecular diffusion coefficient as derived from D s = D 0 u (m-1) , where u is the porosity and m was a sediment constant assumed to be 3 (Ullmann and Aller 1982).…”

Section: In Situ Microprofiling Instrumentmentioning

confidence: 99%

Benthic Carbon Mineralization and Nutrient Turnover in a Scottish Sea Loch: An Integrative In Situ Study

et al. 2016

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Based on in situ microprofiles, chamber incubations and eddy covariance measurements, we investigated the benthic carbon mineralization and nutrient regeneration in a *65-m-deep sedimentation basin of Loch Etive, UK. The sediment hosted a considerable amount of infauna that was dominated by the brittle star A. filiformis. The numerous burrows were intensively irrigated enhancing the benthic in situ O 2 uptake by *50 %, and inducing highly variable redox conditions and O 2 distribution in the surface sediment as also documented by complementary laboratory-based planar optode measurements. The average benthic O 2 exchange as derived by chamber incubations and the eddy covariance approach were similar (14.9 ± 2.5 and 13.1 ± 9.0 mmol m -2 day -1 ) providing confidence in the two measuring approaches. Moreover, the non-invasive eddy approach revealed a flow-dependent benthic O 2 flux that was partly ascribed to enhanced ventilation of infauna burrows during periods of elevated flow rates. The ratio in exchange rates of RCO 2 and O 2 was close to unity, confirming that the O 2 uptake was a good proxy for the benthic carbon mineralization in this setting. The infauna activity resulted in highly dynamic redox conditions that presumably facilitated an efficient degradation of both terrestrial and marine-derived organic material. The complex O 2 dynamics of the burrow environment also concurrently stimulated nitrification and coupled denitrification rates making the sediment an efficient sink for bioavailable nitrogen. Furthermore, bioturbation mediated a high efflux of dissolved phosphorus and silicate. The study documents a high spatial and temporal variation in benthic solute exchange with important implications for benthic turnover of organic carbon and nutrients. However, more long-term in situ investigations with like approaches are required to fully understand how environmental events and spatio-temporal variations interrelate to the overall biogeochemical functioning of coastal sediments.

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Nitrogen cycling in a deep ocean margin sediment (Sagami Bay, Japan)

Cited by 94 publications

References 56 publications

Benthic nitrogen cycling traversing the Peruvian oxygen minimum zone

Benthic nitrogen cycling traversing the Peruvian oxygen minimum zone

Survival and life strategy of the foraminiferan Globobulimina turgida through nitrate storage and denitrification

Benthic Carbon Mineralization and Nutrient Turnover in a Scottish Sea Loch: An Integrative In Situ Study

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