Marines surface sediments

Comparison of the level of POPs contamination in marine sediment of Hong Kong and other countries/regions was made based on best available data and the results are summarized in Table 7.6. Overall, the level of POPs measured in local marine surface sediment was comparable to those reported in most other locations around the world. For DDT, a POPs pesticides of regional interest, the level of mean local sediment contamination was found to be well within the range reported in the Pearl River Estuary (Li et al., 2001), the east coast estuaries of China (Yuan et al., 2001), the coast of Argentina (Menone et al., 2001), the Netherlands (Stronkhorst and Hattum, 2003) and Pakistan (Sanpera et al., 2003), and... 

Rosell-Mele A., Carter J., and Eglinton G. (1994) Distribution of long-chain alkenones and alkyl alkenoates in marine surface sediments from the North East Atlantic. Org. Geochem. 22, 501-509. 

Finster K., Liesack W., and Tindall B. J. (1997) Desulfospira joergensenii, gen. nov., sp. nov., a new sulfate-reducing isolated from marine surface sediment. Syst. Appl. Microbiol. 20, 201-208. 

If one compares these results with those reported by Moreno et ah, it is evident that the Cu contents are significantly higher, although they are coincident with the Cu values found in marine surface sediments from Potter Cove (26). 

Mean Cd, Cu and Zn contents in whole tissue of Antarctic bivalves are compared in Table 6.13. Copper levels detected in bivalves from Potter Cove were higher than those observed in bivalves from East Antarctica. The levels of Cu detected in Laternula elliptica are consistent with the high values of Cu observed in limpet, marine surface sediments and suspended particulate matter. While Zn levels were in agreement with the values reported for Adamussium colhecki, those of Cd were significantly lower in Laternula elliptica. 

The contents of Cu, Cr, Fe, Mn, Pb and Zn found in marine surface sediments of Potter Cove constitute natural background levels of the system and no evidence of metals from anthropogenic activities was gained. Metals detected in the marine surface sediments are consistent with the values measured in freshwater sediments and suspended particulate matter, thus suggesting that the contribution of metals from the streams is the main component of the inshore sediments. It was demonstrated that Stream B is the most important carrier of trace metals from the island to Potter Cove. Nevertheless, additional research will be necessary to confirm this... 

Marine Surface Sediments.. (0-2m) sediments beneath the highly productive upwelling regions in the Gulf of California and off the coast of Peru were chromatograph cally separated (see "Experimental") into (a) pheophytins, (b) pheophorbides (viz. mono carboxylic acids) and (c) chlorin acids (I.e. di-/tri-acids). Table II contains the result of these preliminary analyses and includes the concentration of pigments, present depositional environment and sample depth. 

Farquhar J, Savarino J, Jackson TL, Thiemens MH (2000b) Evidence of atmospheric sulphur in the martian regolith from sulphur isotopes in meteorites. Nature 404 50-52 Finster K, Liesack W, Thamdrap B (1998) Elemental sulfur and thiosulfate disproportionation by desulfocapsa sulfoexigens sp.nov., a new anaerobic bacterium isolated from marine surface sediment. Appl Environ Microbiol 64 119-125... 

Phthalates have also been analyzed in marine sediments. In a recent study, marine surface sediments and biota samples from various locations were collected to assess the sources and distribution profiles of phthalate esters in a specific ecosystem (False Creek Harbour, Vancouver, BC, Canada). Concentrations of all phthalate ester congeners combined ranged from 2.0 to 3.6 ppm on a dry weight basis. The phthalate ester composition found was in some way similar to the North American per capita phthalate ester consumption levels reported. ... 

Fig. 6.6 Pathways of nitrogen in marine surface sediments. Arrows black, organic matter degradation gray, particulate organic nitrogen dotted, diffusion of solutes.

SPATIAL AND TEMPORAL DISTRIBUTION OF BACTERIAL POPULATIONS IN MARINE SHALLOW WATER SURFACE SEDIMENTS... 

Meyer-Reil, L.A., 1986. Spatial and temporal distribution of bacterial populations in marine shallow water surface sediments. In P. Lasserre and 3.M. Martin (eds), Biogeochemical Processes at the Land-Sea Boundary. Elsevier, Amsterdam. 

Bouloubassi, I., Fillaus, J., Saliot, A., 2001. Hydrocarbons in surface Sediments from the Changjiang (Yangtze River) Estuary, East China Sea. Marine Pollut. Bull. 42(12), 1335-1346. 

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