Nitrification in the Schelde estuary: methodological aspects and factors influencing its activity

Bie, M.J.M. de; Starink, Mathieu; Boschker, Henricus T. S.; Peene, J.; Laanbroek, Hendrikus J.

doi:10.1111/j.1574-6941.2002.tb00999.x

Cited by 22 publications

(7 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…del Giorgio and Bouvier (2002) observed a decrease in growth and possible loss of activity of bacteria in the fresh-to salt water transition. This would result in a decrease in nitrification rates and production of N 2 O and it is consistent with the decrease in nitrification at low salinity (Rysgaard et al 1999;De Bie et al 2002;Megalhaes et al 2005;Bange 2006, Aslan andSimsek 2012;Rao and Sarma 2013). In addition to this, lower N 2 O concentrations were observed in the sewage waters (1-2.5 nM) due to possible occurrence of denitrification as near anoxic conditions exist in the sewage.…”

Section: Variations In Concentrations Of Nitrous Oxide (N 2 O) and Itsupporting

confidence: 82%

Modifications in the trace gases flux by a very severe cyclonic storm, Hudhud, in the coastal Bay of Bengal

et al. 2019

View full text Add to dashboard Cite

A very severe cyclonic storm, Hudhud, made landfall at Visakhapatnam city, the central east coast of India, on 12 October 2014 and it is the most destructive cyclone to ever hit the Indian subcontinent since the past two decades. In order to examine its impact on the flux of trace gases into the atmosphere, a study was made in the coastal Bay of Bengal, off Visakhapatnam, after the cyclone and compared with the pre-cyclone conditions. Hudhud suppressed the vertical mixing of the water column due to the occurrence of strong salinity stratification associated with torrential rainfall. The land runoff and precipitation brought significant amount of ammonium to the coastal waters, resulting in increased pH. The increased pH shifted the inorganic carbon equilibrium towards the formation of bicarbonate, resulting in decreased partial pressure of carbon dioxide (pCO 2) after the cyclone Hudhud. The undersaturation of carbon dioxide (CO 2) and nitrous oxide (N 2 O) with respect to atmospheric equilibrium was observed during the post-cyclone period compared to the pre-cyclone period. About 80% of the post-cyclone decrease in N 2 O (>2 nM) and pCO 2 (150-200 μatm) was contributed by the dilution of coastal waters with the precipitated waters. In contrast, methane (CH 4) concentrations were increased by 0.5-2.8 nM during the post-cyclone period than in the pre-cyclone period, and were attributed to the input of domestic sewage through land runoff. Dimethyl sulphide (DMS) and the total dimethyl sulphonio-propionate (DMSP t) concentrations decreased by 0.4-3.9 and 0.2-6.0 nM, respectively, during the post-cyclone period in comparison with the pre-cyclone period and it was consistent with lower phytoplankton biomass during the former than the latter. The seato-air flux of CO 2 , N 2 O and DMS were 1.3 ± 0.5 mmol C m −2 d −1 , 0.9 ± 0.3 μmol m −2 d −1 and 5.8 ± 3 μmol m −2 d −1 during the pre-cyclone period, respectively. The corresponding values during the post-cyclone period were lower at −2.0 ± 1 mmol C m −2 d −1 , −0.4 ± 0.1 μmol m −2 d −1 and 2.8 ± 2 μmol m −2 d −1 , respectively. In contrast, the sea-to-air flux of CH 4 increased from 0.6 to 1.5 μmol C m −2 d −1 from the pre-to the post-cyclone period. This study suggested that the cyclone Hudhud modified the magnitude of the biogenic gas flux to the atmosphere from the coastal Bay of Bengal than hitherto hypothesised.

show abstract

Section: Variations In Concentrations Of Nitrous Oxide (N 2 O) and Itsupporting

confidence: 82%

Modifications in the trace gases flux by a very severe cyclonic storm, Hudhud, in the coastal Bay of Bengal

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Transfer of algal fixed carbon to bacteria or Crenarchaeota through a DOC pool is not likely for several reasons: Firstly, the algal lipids show hardly any 13 C incorporation, suggesting no substantial uptake by algae. Secondly, lipids of heterotrophic bacteria, specifically the anteiso ‐C 15 fatty acids[30], also incorporated only minor amounts of label, suggesting that no 13 C‐labeled organic matter was released. Our experiment thus indicates that a cosmopolitan group of marine picoplankton, the marine Crenarchaeota, are autotrophic organisms.…”

Section: Resultsmentioning

confidence: 55%

Bicarbonate uptake by marine Crenarchaeota

Wuchter

Schouten

Boschker

et al. 2003

FEMS Microbiology Letters

Self Cite

209

145

View full text Add to dashboard Cite

Biphytanyl membrane lipids and 16S rRNA sequences derived from marine Crenarchaeota were detected in shallow North Sea surface water in February 2002. To investigate the carbon fixation mechanism of these uncultivated archaea in situ (13)C bicarbonate tracer experiments were performed with this water in the absence of light. About 70% of the detected (13)C incorporation into lipids (including fatty acids and sterols) is accounted for by the crenarchaeotal biphytanyl membrane lipids. This finding indicates that marine Crenarchaeota can utilize bicarbonate or CO(2) derived thereof in the absence of light and are chemoautotrophic organisms.

show abstract

“…NH 4 + removal rates were determined by single‐end‐point experiments, in which duplicates from selected depths were incubated at in situ temperature (2°C) and 1 atm in the dark for approximately 24 h. This incubation time was within the linear phase of total net NH 4 + removal according to preliminary time‐series measurements [2]. Parallel duplicate subsamples were incubated after treatment with 86 μM (final concentration) of allylthiourea (ATU), a selective inhibitor of autotrophic ammonia oxidation [39] that has been successfully applied in aquatic nitrification studies [40–42]. To a lesser extent, methane oxidation by methanotrophs is also inhibited by ATU [43].…”

Section: Methodsmentioning

confidence: 99%

Autotrophic ammonia oxidation in a deep-sea hydrothermal plume

Lam

Cowen

Jones

2004

FEMS Microbiology Ecology

View full text Add to dashboard Cite

Direct evidence for autotrophic ammonia oxidation is documented for the first time in a deep-sea hydrothermal plume. Elevated NH(4) (+) concentrations of up to 341+/-136 nM were recorded in the plume core at Main Endeavour Field, Juan de Fuca Ridge. This fueled autotrophic ammonia oxidation rates as high as 91 nM day(-1), or 92% of the total net NH(4) (+) removal. High abundance of ammonia-oxidizing bacteria was detected using fluorescence in situ hybridization. Ammonia-oxidizing bacteria within the plume core (1.0-1.4x10(4) cells ml(-1)) accounted for 7.0-7.5% of the total microbial community, and were at least as abundant as methanotrophs. Ammonia-oxidizing bacteria were a substantial component of the particle-associated communities (up to 51%), with a predominance of the r-strategist Nitrosomonas-like cells. In situ chemolithoautotrophic organic carbon production via ammonia oxidation may yield 3.9-18 mg C m(-2) day(-1) within the plume directly over Main Endeavour Field. This rate was comparable to that determined for methane oxidation in a previous study, or at least four-fold greater than the flux of photosynthetic carbon reaching plume depths measured in another study. Hence, autotrophic ammonia oxidation in the neutrally buoyant hydrothermal plume is significant to both carbon and nitrogen cycling in the deep-sea water column at Endeavour, and represents another important link between seafloor hydrothermal systems and deep-sea biogeochemistry.

show abstract

Nitrification in the Schelde estuary: methodological aspects and factors influencing its activity

Cited by 22 publications

References 50 publications

Modifications in the trace gases flux by a very severe cyclonic storm, Hudhud, in the coastal Bay of Bengal

Modifications in the trace gases flux by a very severe cyclonic storm, Hudhud, in the coastal Bay of Bengal

Bicarbonate uptake by marine Crenarchaeota

Autotrophic ammonia oxidation in a deep-sea hydrothermal plume

Contact Info

Product

Resources

About