Distribution of primary production of the benthic microflora and accumulation of organic matter on a tidal flat area, Balgzand, Dutch Wadden Sea

Cadée, Gerhard C.; Hegeman, J.

doi:10.1016/0077-7579(77)90019-9

Cited by 123 publications

(30 citation statements)

References 12 publications

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“…The relative contributions of algal material to sediment OM during the current study were estimated assuming a carbon-to-chlorophyll ratio of 40. Contributions averaged 0.7% (±1.3%) in the upper estuaries, 1.9% (± 2.5%) in the middle estuaries, to around 8.6% (± 5.6%) in the highly productive lower estuary sands, which is in agreement with estimations from other shallow estuarine systems (Cadee & Hegeman 1977, Kristensen et al 1997. Using total sediment chloropigments raises the percent contributions in the upper estuaries (where pheophytin concentrations are generally highest) by up to an order of magnitude.…”

Section: Sources Of Sediment Organic Mattersupporting

confidence: 76%

“…The relative contributions of living BMA biomass to the sediment carbon pool may be estimated by applying a chlorophyll-to-carbon (biomass) conversion factor. The reported range for the ratio of biomass to chl a in pelagic phytoplankton varies between 22 and 154 (Valiela 1995) and may be as high as 200 (Parsons et al 1977), while that of BMA averages about 42 within a range of 18 to 79 (Cadee & Hegeman 1977, Gould & Gallagher 1990, Valiela 1995, Kristensen et al 1997). During the current study, chl c yielded the tightest relationship with productivity, with maximum productivity and un-degraded biomass (chlorophyll:pheophytin = 1.7) occurring at a chl a:c of 5, which suggests that diatoms are the predominant BMA taxa (Mackey et al 1996).…”

Section: Sources Of Sediment Organic Mattermentioning

confidence: 99%

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Organic matter and benthic metabolism in euphotic sediments along shallow sub-tropical estuaries, northern New South Wales, Australia

Ferguson

Eyre²

2003

Aquat. Microb. Ecol.

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Section: Sources Of Sediment Organic Mattersupporting

confidence: 76%

Section: Sources Of Sediment Organic Mattermentioning

confidence: 99%

Organic matter and benthic metabolism in euphotic sediments along shallow sub-tropical estuaries, northern New South Wales, Australia

Ferguson

Eyre²

2003

Aquat. Microb. Ecol.

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“…Further possible mechanisms influencing the MPB distribution include, for example, spatial variations in nutrient availability, grazing (e.g. Fenchel, 1968;Cade´e & Hegeman, 1977;Cahoon, 1999;Middelburg et al, 2000;Evrard et al, 2008) and finally, competition among MPB species (e.g. van der Grinten et al, 2005;Leflaive & Ten-Hage, 2008).…”

mentioning

confidence: 99%

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Scholz

Liebezeit

2012

European Journal of Phycology

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The microphytobenthos colonizing the intertidal flats forms an important component of the Wadden Sea. Ten sampling points along a 1-km transect were studied in a fringe area of the Soltho¨rn tidal flat, southern North Sea, in order to determine seasonal differences in the microphytobenthos. An accompanying paper deals with the major component of the flora, the diatoms; here we, focus on the minor taxonomic groups. From May 2008 to May 2009 surface sediments were collected during low tide. Variation of environmental factors as well as microphytobenthic density (abundance and chlorophyll a) were monitored. The area investigated was a mixed-sediment mudflat, with a gradient from coarse to fine. Highest biomass was obtained in summer 2008 with 215.9 AE 12.6 mg chlorophyll a m -2 . In late autumn the chlorophyll a concentration decreased continuously at all investigated stations. Lowest values were detected in December 2008. Species abundances varied considerably both along the transect and seasonally, depending on species-specific requirements as well as hydrodynamic conditions (tidal currents). Higher densities of benthic pro-and eukaryotic microalgae were observed in sites characterized by fine sediments. Apart from the diatoms, the most abundant microphytobenthic group was the cyanophytes. Coccoid cyanophytes, mainly Merismopedia sp., were most abundant during summer, with cell numbers up to 5.72 Â 10 6 cells cm À2, while diatoms dominated in winter, spring and autumn. Filamentous cyanophytes, particularly Microcoleus chthonoplastes, were most abundant during autumn, while coccoid chlorophytes (spring: Chlorococcum submarinum, Crucigenia tetrapedia, Tetraselmis suecica), euglenophytes (summer: Euglena obtusa), dinophytes (autumn: Amphidinium operculatum, A. herdmanii) and cryptophytes (autumn: Hillea marina, Hemiselmis virescens) contributed to the microphytobenthos during warmer seasons. The statistical analysis confirmed that the composition of the microphytobenthos was related to sediment features and to characteristics of particular seasons.

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“…In these models, denitrification was assumed to form the main removal pathway of bio-available nitrogen from the estuarine ecosystem, although the potential role for removal up the foodchain was recognised but largely discounted (Nixon 1981). Later, the importance of productivity by benthic microalgae (BMA) in euphotic sediments was demonstrated (Cadee & Hegeman 1977, Revsbech et al 1981, Colijn & de Jonge 1984, Rizzo & Wetzel 1985, Sundback 1986, and autotrophic benthic production was shown to have direct and indirect impacts on benthic nutrient fluxes (Andersen et al 1984, Sundback & Graneli 1988. These included the direct assimilation of nutrients by autotrophs (Rueter et al 1986), as well as influencing microbial metabolism through modification of sediment biogeochemistry (e.g.…”

Section: Introductionmentioning

confidence: 99%

Benthic nutrient fluxes in euphotic sediments along shallow sub-tropical estuaries, northern New South Wales, Australia

Ferguson¹,

Eyre²,

Gay³

2004

Aquat. Microb. Ecol.

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Diurnal benthic fluxes of dissolved inorganic and organic nitrogen (DIN and DON) and dinitrogen gas (N 2 ) were measured in euphotic sediments of 3 shallow sub-tropical Australian estuaries during 4 seasons. The estuaries included 2 impacted by sewage effluent (Brunswick and Simpsons estuaries) and 1 relatively pristine system (Sandon estuary). Sediments acted predominantly as net sinks of DIN throughout the year, except in the nutrient-enriched upper reaches of the Brunswick estuary, where large effluxes of NH 4 + occurred during the summer wet season. Distinct light/dark variations in NH 4 + fluxes with reduced effluxes or reversal to uptakes occurred during the light in productive sediments. NO 3 -was predominantly taken up by sediments at rates proportional to ambient concentrations in the water column. DON commonly comprised a major fraction of fluxes and was controlled primarily by heterotrophic processes in the upper to middle estuaries and autotrophic processes in the lower estuaries. Large deficits in the amount of remineralised DIN (assuming the breakdown of 'Redfield' algae) indicated that a significant amount of nitrogen is either denitrified or immobilised in biomass in the sediments. Benthic fluxes of N 2 suggest that denitrification accounts for a relatively small fraction of the missing nitrogen and immobilisation in biomass (and flow up the food chain) is a potentially major pathway of nitrogen removal in these estuaries. Significant rates of benthic productivity also stimulated secondary heterotrophic production, promoting competition for nutrient resources in the sediments. The highest rates of DIN uptake coincided with maximum metabolic rates in sediments where the diurnal p/r (gross productivity/respiration) was between 0.5 and 1, suggesting a peak in competition at this metabolic state. Denitrification rates were lowest at p/r 0.5 to 1 and strongly related to uptake of DIN from the water column, suggesting that competition may cause NO 3 -limitation in these euphotic sediments. Dissimilatory NO 3 -reduction to ammonium may become relatively more important as water column oxygen saturation drops below 40%, a condition that occurs regularly in the upper Brunswick estuary. NH 4 + was only effluxed in net heterotrophic sediments (p/r < 1), while fluxes tended towards zero in net autotrophic sediments (p/r > 1). A conceptual model for benthic nutrient cycling in shallow sub-tropical estuaries is proposed whereby benthic productivity favours to the immobilisation of nitrogen in biomass at the expense of denitrification and recycling back to the water column.

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Distribution of primary production of the benthic microflora and accumulation of organic matter on a tidal flat area, Balgzand, Dutch Wadden Sea

Cited by 123 publications

References 12 publications

Organic matter and benthic metabolism in euphotic sediments along shallow sub-tropical estuaries, northern New South Wales, Australia

Organic matter and benthic metabolism in euphotic sediments along shallow sub-tropical estuaries, northern New South Wales, Australia

Microphytobenthic dynamics in a Wadden Sea intertidal flat – Part II: Seasonal and spatial variability of non-diatom community components in relation to abiotic parameters

Benthic nutrient fluxes in euphotic sediments along shallow sub-tropical estuaries, northern New South Wales, Australia

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