Amino acids and hexosamines as indicators of organic matter degradation state in North Sea sediments

Article Abstract:

Sediment cores have been analyzed to determine the degradation state of organic matter at six stations in the eastern North Sea, based on the presence of amino acids and hexosamines. Some essential amino acids needed for macrofauna nutrition, such as arginine, methionine and histidine, were found in lower concentrations in the sediments than in organism tissue and thus may represent limiting factors for deposit-feeders. Use of amino acids as an indicator of degradation state was supported.

North Sea, Biodegradation, Amino acids

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The role of adsorption in sediment-water exchange of phosphate in North Sea continental margin sediments

Article Abstract:

North Sea sediments have wide variation in their ability to adsorb PO4. The adsorption coefficient correlates well with the level of NH4-oxalate-extractable Fe. The data suggest that adsorption is often a significant factor in control of sediment-water exchange of PO4. An assumption of simultaneous equilibrium and first-order kinetic reversible adsorptive reactions enables adequate modeling of enhanced retention and release of PO4 in a one-dimensional reaction-diffusion model.

Phosphates, Adsorption, Continental margins

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Constancy of bacterial abundance in surficial marine sediments

Article Abstract:

Bacterial abundance was found to be relatively constant in a study involving direct microscopic counts of surficial marine sediments. Abundance was scaled to the fluid volume of pore water rather than to dry sediment mass. The results suggest that factors controlling abundance, such as nutrient acquisition or rate of encounters with predators, may also be scaled to the fluid volume of pore water.

Marine bacteria

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