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Seasonal variation of methylmercury in sediment cores from the Tagus Estuary (Portugal)


, : Seasonal variation of methylmercury in sediment cores from the Tagus Estuary (Portugal). Marine Pollution Bulletin 104(1-2): 162-170

Seasonal and spatial variations of dissolved and particulate methylmercury were evaluated for the first time in sediment cores from the Tagus Estuary. Results showed the highest MeHg concentrations in summer months indicating that the "seasonally" methylation process occurs not only at the topmost layers of the sediments but also in the deeper layers of the sediment column. The proportion of MeHg (up to 92%) in some of our pore water samples was higher than values reported in the literature for other estuaries suggesting that the sedimentary environment in the Tagus tends to favour Hg methylation. This work points to the importance of seasonal variation of the MeHg production in sediment cores. In physically dominated estuaries this enhances seasonal MeHg production in deeper sediments that can have serious ecological impacts due to resuspension or advection processes under extreme events by the increase of MeHg transported to the water column.

US$19.90

PMID: 26851871

DOI: 10.1016/j.marpolbul.2016.01.042


Other references

Johnson, F.B.; Bodily, A.S., 1975: Effect of environmental pH on adenovirus-associated virus. The influence of environmental pH on AAV was studied in infectious virus titrations, induction of CF antigens production of infectious virus, induction of immunofluorescent stainable antigen, and aggregation of the viral particles. The pH of the m...

Battista, M-Claude.; Roberge, C.; Martinez, A.; Gallo-Payet, N., 2009: 24-dehydrocholesterol reductase/seladin-1: a key protein differentially involved in adrenocorticotropin effects observed in human and rat adrenal cortex. DHCR24 (24-dehydrocholesterol reductase), or seladin-1, is one of the most expressed genes in the adrenal gland. Because the rat and human adult adrenal cortex differ in their respective functional properties, the aim of the present study was to v...

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Knight, S.M., 2003: Effects of establishment technique and number of management passes on winter wheat production costs. A 4-year study was undertaken with the aim of reducing the unit costs of consecutive wheat crop production without reducing output, by focusing on the interactions between lower-cost establishment and minimum pass husbandry. Replicated large-block...

Wiseman, H., 1995: Taking tamoxifen to heart. Nature Medicine 1(12): 1226-1226

Gomes, Célia.Regina.de.Godoy.; Chopard, R.Paulo., 2005: A morphometric study of age-related changes in the elastic systems of the common carotid artery and internal carotid artery in humans. The present study aims to quantify the distribution of the elastic fiber system in the walls of the common carotid artery and the internal carotid artery in humans. In order to identify specific fibers, segments of carotid arteries were stained us...

Rancich, J.D.; Brix, R.A.; Onusaitis, R.F.; Bucholz, K.B.; Peterson, C.S.; Lorenz, G.W.; Moriarty, D.K.; Banasiak, A.R., 2000: Method for automated continuous production of chewing gum. A system and method are provided for automatically and continuously producing chewing gum and/or chewing gum base. A system controller receives inputs of parameters necessary for production. Ingredients are automatically and continuously fed and m...

Cantera K., JR.; Neira O., R., 1987: Primer registro del genero Echineulima Lutzen y Nielsen (Gastropoda: Eulimidae), moluscos parasitos de erizos de mar en la isla de Gorgona (Pacifico colombiano). Anales del Instituto de Investigaciones Marinas de Punta de Betin, 17: 87-93

Verhoeven, J.T.J.; Jansen, C.C.C.; Roenhorst, J.W.; Steyer, S.; Michelante, D.; Bolivarlaan, S., 2007: First report of Potato spindle tuber viroid in tomato in Belgium. This paper reports the first occurrence of potato spindle tuber viroid on tomato in Belgium. Greenhouse tomatoes showed symptoms during August 2006. Sequence analysis of PCR samples from the isolate showed that the genome was 358 nt, and was 100%...

Collin, J.E., 1902: Note on Acletoxenus syrphoides. Entom Mag, XXXVIII 1-3 and 282