Estuarine sediments Estuary

Rysgaard, S., Thastum, P., Dalsgaard, T., Christensen, P.B., and Sloth, N.P. (1999) Effects of salinity on NH4+ adsorption capacity, nitrification, and denitrification in Danish estuarine sediments. Estuaries 22, 21-30. 

Rae, J.E. Allen, J.R.L. (1993) The significance of organic matter degradation in the interpretation of historical pollution trends in depth profiles of estuarine sediment. Estuaries 16, 678-82. 

S-Norway/W-Sweden estuaries Estuarine sediment A9PEO 3 0.03-0.15a [23]... 

Scheldt estuary (The Netherlands) Estuarine sediment AgPEOi i2 <0.0003-0.240a [13]... 

Elbe estuary (Germany) Estuarine sediment NP 0.370-0.480a [39]... 

De Voogt et al. [23] analysed marine and estuarine sediments from 22 sites in northwestern Europe (extending from Ireland and France to Norway and Sweden) by HPLC-FL. NP, OP, AgPEO and AgPEO concentration ranges of 0.1-17, highest levels were found in the estuaries of the rivers Seine, Mersey, Rhine/Meuse, Weser and Elbe. 

Nitrogen pollution has received far more attention than that of phosphorus for two reasons. First, it has been considered as the nutrient-limiting primary production in estuaries and coastal waters. Second, its loading into the coastal zone has been far greater than that of phosphorus (Figure 24.21). It is also more efficiently exported into the ocean due in part to formation of iron phosphate minerals in anoxic estuarine sediments. 

The effects of macrofaunal bioturbation on the chemical and physical properties of estuarine sediments are well documented. The composition of benthic communities and their potential roles in bioturbating sediments are largely controlled by salinity, grain size, and sediment depositional gradients in estuaries. 

Acyclic ketones, such as linear alkane-2-ones, are another class of lipids commonly found in aquatic systems (Volkman et al., 1983 Hernandez et al., 2001 Jaffe et al., 2001). Hernandez et al. (2001) found a shift in the alkane-2-one distribution from C27 to C31 in the upper estuary to C25 in the lower estuary and attributed these changes to tidal changes in the delivery of seagrass detritus. Another acyclic ketone recently found in estuarine sediments is 6,10,14-trimethylpentadecane-2-one, believed to be a decay product of phytol, which may be indicative of mangrove inputs (Jaffe et al., 2001). 

River waters entering at the head of an estuary typically show higher concentrations of C02 and lower concentrations of 02. This is due to the loading of enriched jt>C02 waters from river inputs, which are high because they contain the mineralization signatures from soils, bordering freshwater wetlands, and resuspension from upper estuarine sediments. 

Dyer, K.R. (ed.) (1979) Estuaries and estuarine sedimentation. In Estuarine Hydrography and Sedimentation—A Handbook pp. 1-18, Cambridge University Press, Cambridge, UK. 

Maruya, K.A., Loganathan, B.G, Kannan, K., McCumber-Kahn, S., and Lee, R.F. (1997) Organic and organometallic compounds in estuarine sediments from the Gulf of Mexico (1993-1994). Estuaries 20, 700-709. 

Schubel, J.R. (ed.) (1972) Classification according to mode of basin formation. In The Estuarine Environment Estuaries and Estuarine Sedimentation, pp. 2-8, American Geological Institute, Washington, DC. 

Summers, J.K., Wade, T.L., and Engle, V.D. (1996) Normalization of metal concentrations in estuarine sediments from the Gulf of Mexico. Estuaries 19, 581-594. 

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