Seasonal benthic organic matter mineralisation measured by oxygen uptake and denitrification along a transect of the inner and outer River Thames estuary, UK

  title={Seasonal benthic organic matter mineralisation measured by oxygen uptake and denitrification along a transect of the inner and outer River Thames estuary, UK},
  author={Mark Trimmer and David B. Nedwell and David Sivyer and Stephen J. Malcolm},
  journal={Marine Ecology Progress Series},
Seasonal measurements of organic matter mineralisation by oxygen uptake and denitrification were carried out from July 1996 to March 1998 along a -200 km transect of the River Thames estuary, UK. There was a distinct gradient of decreasing rates of organic matter mineralisation seaward, which was related to the concentration of suspended solids and sedimentary organic carbon (C) at each site. There was clear seasonality and highest rates of oxygen uptake (10 056 pmol O 2 m -2 h -1 ) at the… 

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The contribution of denitrification to sediment metabolism was studied at 2 sites (muddy and sandy) in unvegetated tidal creek sediments from a small Cape Cod, USA, salt marsh receiving

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Sediment incubation microcosms, multitrap apparatus and water column variables have been employed to describe the dynamic changes in benthic-pelagic coupling between nutrient pools in the Pontevedra

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The results demonstrate that the bottom sediments are important sites of organic degradation in the North Sea system.

High nitrate, muddy estuaries as nitrogen sinks: the nitrogen budget of the River Colne estuary (United Kingdom)

The muddy estuary of the River Colne, east coast UK, is hypernutrified, with strong gradients of N 0 3 a n d NH,+up the estuary, which implies that any environmental impact in coastal waters may be the result of much lower loads of nitrogen than hitherto assumed.

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Rates of microbially mediated sedimentary organic carbon remineralization vary along the salinity gradient of the White Oak River estuary, N.C. A direct comparison of two sites, one upriver dominated

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A free operating benthic flux chamber lander (ELINOR) was used to measure in s ~ t u denitrification rates in the Aarhus Bight, Denmark (16 m depth). After insertion of the flux chamber into the

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Anaerobic metabolism was the dominant metabolic pathway in control and treated sediments, with 50 to 70% of annual carbon remineralization due to sulfate reduction, and oxygen consumption and suifate reduction rates both increased as a result of carbon sedimentation.

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Carbon and nitrogen mineralisation increased as the transect entered the mangrove, indicating a greater availability of organic matter, probably by root excretion, and time course measurements of sulphate reduction indicated a subsurface pool of labile carbon.

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Total denitrification rates (estimated from nitrification and nitrate fluxes) increased with increased organic addition, because of the high concentrations of NO3− (40 μM) in the overlaying water.