Laboratory study of nitrogen and phosphorus remineralization during the decomposition of coastal plankton and seston

Garber, Jonathan

doi:10.1016/0272-7714(84)90039-8

Cited by 112 publications

(73 citation statements)

References 34 publications

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“…In this sense, high flushing rates makes the Ría de Ares-Betanzos quite susceptible to exhibit fractionation. Furthermore, P compounds cycle faster than N compounds (Garber, 1984;Hopkinson et al, 2002). Consistently, whereas N and P fractionation is observed in the net ecosystem metabolism of the inner boxes A and B, only P fractionation is observed in the outer box C.…”

Section: Nutrient Fertilization and Net Utilization Patternssupporting

confidence: 63%

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

Villegas‐Ríos

Álvarez‐Salgado

Piedracoba

et al. 2011

Continental Shelf Research

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O 2 , N, P and Si net ecosystem metabolism of the Ría de Ares-Betanzos (NW Iberian upwelling system) was estimated during two 3-wk periods of contrasting summer downwelling and autumn upwelling conditions by means of a transient 2-D kinematic box model. The subtidal circulation was positive in both situations, although it was depressed during downwelling and enhanced during upwelling. Concurrently, the ría was fertilised mainly by shelf bottom waters, which introduced from 69% (under downwelling) to almost 100% (under upwelling) of the limiting N nutrients. The ría was an efficient nutrient trap: about 70% of the N nutrients that entered the embayment were retained under downwelling conditions (average flushing time, 9 days) and about 50% under upwelling conditions (average flushing time 3 days). Although the trapping efficiency was lower, the net ecosystem production (NEP) was much higher under upwelling (from 1.0 ± 0.3 to 1.5 ± 0.4 g C m -2 d -1 ), than under downwelling favourable winds (from 0.2 ± 0.1 to 0.3 ± 0.1 g C m -2 ). The stoichiometry of NEP suggests that P and N compounds recycled faster than C compounds, specially in the inner segment of the ría. The net degree of silification was twice in the inner than in the outer segment of the ría.

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Section: Nutrient Fertilization and Net Utilization Patternssupporting

confidence: 63%

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

Villegas‐Ríos

Álvarez‐Salgado

Piedracoba

et al. 2011

Continental Shelf Research

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“…The microbially mediated remineralisation of N (ammonification) following phytoplankton decomposition has previously been demonstrated in a laboratory study, which suggested that this process may occur in seawater (Garber, 1984). Here we demonstrate a 'proof of concept', whereby the turnover of TMA resulted in the release of remineralised N in the form of ammonia, which was subsequently taken up by another bacterium and used to support growth.…”

Section: Incubation Conditionsmentioning

confidence: 85%

“…N-rich compounds may represent a source of ammonia in the oceans, as the C in these compounds is catabolised to generate energy (Sun et al, 2011;Halsey et al, 2012). This process may reduce the amount of N lost to the sub-photic zone through the sinking of cell debris and particles, and may provide a feedback between the phytoplankton and heterotrophic bacteria (Azam et al, 1983;Garber, 1984). Interestingly, in bacteria from the SAR11 clade, N limitation does not induce any of the genes involved in the catabolism of MAs, while energy starvation (in the dark) does induce some Smith et al, 2013).…”

Section: Incubation Conditionsmentioning

confidence: 99%

Trimethylamine and trimethylamine N-oxide are supplementary energy sources for a marine heterotrophic bacterium: implications for marine carbon and nitrogen cycling

2014

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Bacteria of the marine Roseobacter clade are characterised by their ability to utilise a wide range of organic and inorganic compounds to support growth. Trimethylamine (TMA) and trimethylamine N-oxide (TMAO) are methylated amines (MA) and form part of the dissolved organic nitrogen pool, the second largest source of nitrogen after N 2 gas, in the oceans. We investigated if the marine heterotrophic bacterium, Ruegeria pomeroyi DSS-3, could utilise TMA and TMAO as a supplementary energy source and whether this trait had any beneficial effect on growth. In R. pomeroyi, catabolism of TMA and TMAO resulted in the production of intracellular ATP which in turn helped to enhance growth rate and growth yield as well as enhancing cell survival during prolonged energy starvation. Furthermore, the simultaneous use of two different exogenous energy sources led to a greater enhancement of chemoorganoheterotrophic growth. The use of TMA and TMAO primarily as an energy source resulted in the remineralisation of nitrogen in the form of ammonium, which could cross feed into another bacterium. This study provides greater insight into the microbial metabolism of MAs in the marine environment and how it may affect both nutrient flow within marine surface waters and the flux of these climatically important compounds into the atmosphere.

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“…The higher temperature for the October incubations was probably a factor. Studies of the decomposition of algae in seawater typically show increasing initial rates with increasing temperature, but no change in the final extent of remineralization (Garber 1984). Benthic community respiration also increases with temperature (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Additional evidence for the multiple-G model has been presented by Westrich and Berner (1984), who found that plankton subjected to a previous interval of oxic decomposition decomposed more slowly when added to anoxic sediments than did fresh plankton. In several studies of plankton decomposition (Garber 1984 and refcrenccs cited therein) initially rapid remineralization rates ' This research was supported by NSF grants OCE 82-14537 and OCE 84-15557. Additional support was provided by the donors of the Petroleum Research fund, administered by the American Chemical Society.…”

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confidence: 99%

Decomposition of ¹⁴C‐labeled organic substances in marine sediments1

Henrichs

Doyle

1986

Limnology & Oceanography

107

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The depth variation of total organic carbon (TOC), organic matter composition, and porewater composition in marine sediments suggests that different components of the organic matter undergo decomposition at widely different rates. The decomposition of 14C-labeled organic substances was followed in sediment microcosms in the laboratory. The substances used were chosen to simulate a portion of material settling to the sediment-water interface (a marine diatom) or hypothesized components of refractory sediment organic matter (melanoidins and a bacterial polymer). The microcosms were found to be good models of the sediment-water interface in terms of how well they mimicked sediment decomposition rates and processes. The decomposition of the labeled material and the natural sediment TOC were monitored over 1 month: the water overlying the sediment remained oxic, and net consumption of nitrate was small. There was no detectable sulfate reduction. The algae and the bacterial polymer were decomposed on average 9 x faster than the melanoidins and 90 x faster than the natural sediment TOC. The soluble fraction of the algae was decomposed more rapidly than the particulate material.Berner (1980) proposed a model for the multiple "pools" of organic matter in sediments being decomposed at different rates. This "multiple-G" model is based in part on depth profiles of total organic carbon (TOC) and porewater-dissolved sulfate in anoxic marine sediments, which show a marked decrease in the rate of sulfate reduction with depth even though a substantial fraction of the surface TOC concentration remains. Others (e.g. Jorgensen 1978;Murray et al. 1978;Henrichs and Farrington 1984;Martens and Klump 1984) have found that the multiple-G model, with firstorder decomposition kinetics for a labile organic fraction, fits porewater and sediment data from a variety of sediments. Additional evidence for the multiple-G model has been presented by Westrich and Berner (1984), who found that plankton subjected to a previous interval of oxic decomposition decomposed more slowly when added to anoxic sediments than did fresh plankton. In several studies of plankton decomposition (Garber 1984 and refcrenccs cited therein) initially rapid remineralization rates '

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Laboratory study of nitrogen and phosphorus remineralization during the decomposition of coastal plankton and seston

Cited by 112 publications

References 34 publications

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

Trimethylamine and trimethylamine N-oxide are supplementary energy sources for a marine heterotrophic bacterium: implications for marine carbon and nitrogen cycling

Decomposition of ¹⁴C‐labeled organic substances in marine sediments1

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Laboratory study of nitrogen and phosphorus remineralization during the decomposition of coastal plankton and seston

Cited by 112 publications

References 34 publications

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

Net ecosystem metabolism of a coastal embayment fertilised by upwelling and continental runoff

Trimethylamine and trimethylamine N-oxide are supplementary energy sources for a marine heterotrophic bacterium: implications for marine carbon and nitrogen cycling

Decomposition of 14C‐labeled organic substances in marine sediments1

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Decomposition of ¹⁴C‐labeled organic substances in marine sediments1