Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Sundbäck, Kristina; Granéli, Wilhelm

doi:10.3354/meps043063

Cited by 146 publications

(69 citation statements)

References 25 publications

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“…NH, release has either been greatly reduced compared to dark-incubation rates (Nowlcki & Nixon 1985b, Rizzo 1990 or flux direction has been reversed, with sedirnents becoming NH, sinks (Sundback & Graneli 1988, Nilsson et al 1991. The earlier study by Rizzo (1990) for a site in the York River estuary of Chesapeake Bay (USA) is of particular interest.…”

Section: Discussionmentioning

confidence: 99%

“…Microalgal communities can control sediment-water exchanges of nutrients through direct uptake and indirectly by oxygenating surface sediment (Andersen et al 1984, Vries & Hopstaken 1984, Nowiclu & Nixon 1985b, Asmus 1986, Kelderman et al 1988, Sundback & Graneli 1988, Keizer et al 1989, Rizzo 1990). The importance of benthic rnicroalgae as primary producers in intertidal ecosystems has long been established (Pomeroy 1959, Pamatmat 1968, Leach 1970, Riznyk & Phinney 1972, Cadee & Hegeman 1974, Gallagher & Daiber 1974, Sullivan & Daiber 1975.…”

Section: Introductionmentioning

confidence: 99%

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Significance of euphotic sediments to oxygen and nutrient cycling in a temperate estuary

Rizzo¹,

Lackey²,

Christian³

1992

Mar. Ecol. Prog. Ser.

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Sediment-water nutrient and oxygen exchanges were measured under light and dark conditions at 1 oligohaline (Stn D) and 1 mesohaline (Stn A) shallow (1 m) site in the Neuse River estuary, North Carolina. USA. Mean respiration rates were very similar between sites (11 to 12 mg 0 2 m-' h-'), but maximum net productivity at the mesohaline site (74 mg Oz m-' h-') was nearly twice that of the oligohaline site (40 mg O2 m-2 h-'). NH4 fluxes were also significantly different. On average, releases of NH, from sediments at both sites occurred in the dark (13 to 22 pm01 N h-' for Stns D and A, respectively) and, slightly, at the lowest irradiance (67 E m-' S-'. 0.3 to 5 pm01 N h-'). NH, was taken up at average rates between 3 and 12 pm01 N m-' h-' at 3 higher irradiances. Mean NO, (nitrate + nitnte) fluxes were very low ( < l 0 pm01 N m-2 h-'), nearly always directed out of the sediment, and not significantly different. Filterable reactive phosphorus fluxes also did not follow any consistent response to changes in irradiance. Flux vs irradiance curves were used in conjunction with estimates of in situ light availability to the benthos to compute ecosystem-level influence of autotrophy on material exchanges. The autotropic-heterotrophic transitions were 1 to 2 m (oligohaline) and 3 to 4 m (mesohaline). When integrated over depth and area the mesohaline sediments were always net NH, sources to the water column, net O2 sources in fall and winter and net O2 sinks in spring and summer. Oligohaline sediments were O2 sinks except during fall, and NH, sources only in winter and summer. Cultural eutrophication has the potential to alter the balance of benthic autotrophy and heterotrophy which in turn may foster phytoplanktonic productivity.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Significance of euphotic sediments to oxygen and nutrient cycling in a temperate estuary

Rizzo¹,

Lackey²,

Christian³

1992

Mar. Ecol. Prog. Ser.

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“…High rates of ammonium flux can occur in sediments underlying natural bivalve populations (Dame et al 1989, 1991, Dame & Libes 1993, Asmus & Asmus 1991, but other factors such as microphytobenthos abundance also affect nutrient transformations and regeneration (Sundbäck & Graneli 1988, Sundbäck et al 1991. Incubation experiments have shown that particulate organic matter, oxygen conditions, and microphytobenthos abundance affect nitrogen transformations and regeneration from the sediments (Caffrey et al 1993, Enoksson 1993, Newell et al 2002.…”

Section: Introductionmentioning

confidence: 99%

Effect of oysters Crassostrea virginica and bottom shear velocity on benthic-pelagic coupling and estuarine water quality

Porter

Cornwell²,

Sanford³

2004

Mar. Ecol. Prog. Ser.

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Increasing the biomass of bivalve suspensions feeders has been proposed as a means to improve water quality in eutrophic estuaries such as the Chesapeake Bay. However, water quality impacts are likely to be determined by the balance of bivalve feeding and the deposition and sediment regeneration of nutrients from particulate organic matter. In shallow-water environments, benthic and pelagic processes are closely coupled and water flow can regulate the supply of seston to the bivalves. In addition, such flow may regulate benthic-pelagic nutrient fluxes through mass transfer limitation and resuspension. We studied the interacting effects of juvenile oysters Crassostrea virginica and bottom shear velocity on phytoplankton biomass and on nutrient regeneration in a series of three 4 wk long comparative experimental ecosystem experiments. All mesocosms had a 1000 l water volume, a 1 m 2 sediment surface area, and a 1 m water-column depth, and the same realistic water-column mixing (turbulence intensity 1 cm s -1 ). The systems included a multi-component mesocosm with moderate bottom shear velocity (0.6 cm s -1 ) and 2 standard cylindrical tanks with an unrealistically low bottom shear velocity (0.1 cm s -1 ). Oysters shifted processes to the sediments by decreasing phytoplankton biomass without stimulating additional blooms and by increasing light penetration to the bottom. Through complex and indirect relationships, the interaction of oysters and enhanced shear velocity significantly affected microphytobenthos biomass. Light, as enhanced by the oyster feeding on phytoplankton, increased microphytobenthos biomass; a moderate bottomshear velocity eroded the biomass. Microphytobenthos biomass decreased nutrient regeneration from the sediments to the water column and may have implications for water quality in low-energy parts of shallow-water estuaries such as Chesapeake Bay. Enhanced bottom shear in more energetic parts of shallow estuaries negatively affects microphytobenthos biomass and may increase nutrient regeneration from the sediments.

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“…On sandy and muddy substrates, edaphic microalgal assemblages living on a benthic surface are often dominated by diatoms (Colijn & Koeman, 1975;Colijn & Nienhuis, 1977;Admiraal et al, 1984;Colijin & De Jonge, 1984;Vos et al, 1988;De Jonge & Colijn, 1994;Agatz et al, 1999). These biofilms are particularly important in the ecology of mudflats as they exhibit high rates of primary production (Pinckney & Zingmark, 1991), influence erosion and deposition of sediment (Underwood & Paterson, 1993;Paterson, 1994), and affect sediment-water nutrient fluxes (Sundba¨ck & Grane´li, 1988;Rysgaard et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Compatible solutes in three marine intertidal microphytobenthic Wadden Sea diatoms exposed to different salinities

Scholz

Liebezeit

2012

European Journal of Phycology

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Diatoms inhabiting intertidal flats are subject to strongly changing salinities due to exposure to rain and desiccation at low tide. In order to determine the physiological responses of marine benthic diatoms to salinity changes, cultures of Navicula phyllepta, Achnanthes delicatula subsp. hauckiana and Nitzschia constricta, isolated from the Soltho¨rn tidal flat (lower Saxony, southern North Sea), were used to study the effect on growth rates of different salinities (0.5, 10, 20, 30, 40, 50). During short (1, 3, 10, 60 min) and long exposures (30 days), the composition of free amino acids and the accumulation of polyols, saccharides, quaternary ammonium compounds and -dimethylsulphoniopropionate (DMSP) were determined. The growth rates of N. phyllepta were not affected by salinity in the tested range, synthesizing and accumulating proline as the only response to salinity increases in the growth medium. The growth responses of A. delicatula subsp. hauckiana were significantly weaker at the lowest and highest salinities in comparison to the control treatment (at a salinity of 30), producing proline, glycine betaine, glycerol and the quaternary ammonium compound homarine. In contrast, N. constricta showed the highest growth rate in the low-salinity treatment and the lowest proline concentrations in the high-salinity assay in comparison to the other species. In addition, N. constricta was the only species that synthesized the tertiary sulphonium compound DMSP. Furthermore, results from the salinity treatments showed particular similarities in compound accumulation. While quaternary ammonium compounds as well as DMSP were synthesized during high-salinity treatments, polyols and carbohydrates were found predominantly in the low-salinity experiments. Enzyme activities specific to proline metabolism in A. delicatula and N. constricta indicated that the high salinity-induced free proline accumulation may be due to a stimulation of synthesis via the ornithine pathway, whereas in N. phyllepta the glutamate pathway may contribute significantly to the free proline accumulation. In conclusion, significant differences in osmolyte compositions were found in the three diatom species during exposure to different salinities, suggesting specific intracellular acclimation processes that provide possible explanations of the species' insensitivity towards environmental short-time salinity variations.

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Influence of microphytobenthos on the nutrient flux between sediment and water- a laboratory study

Cited by 146 publications

References 25 publications

Significance of euphotic sediments to oxygen and nutrient cycling in a temperate estuary

Significance of euphotic sediments to oxygen and nutrient cycling in a temperate estuary

Effect of oysters Crassostrea virginica and bottom shear velocity on benthic-pelagic coupling and estuarine water quality

Compatible solutes in three marine intertidal microphytobenthic Wadden Sea diatoms exposed to different salinities

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