The Origin of Methylmercury in Open Mediterranean Waters
We present high-resolution vertical profiles of methylated mercury $(MeHg_T = monomethylmercury\, + \,\dim ethylmercury)$ concentrations in the water column of the open and marginal areas of the Mediterranean Sea. $MeHg_T $ concentrations ranged from < 0.015 pmol L⁻¹ to 0.430 pmol L⁻¹ (n = 130),...
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| Veröffentlicht in: | Limnology and oceanography 2009-05, Vol.54 (3), p.837-844 |
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| container_title | Limnology and oceanography |
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| creator | Cossa, Daniel Averty, Bernard Pirrone, Nicola |
| description | We present high-resolution vertical profiles of methylated mercury $(MeHg_T = monomethylmercury\, + \,\dim ethylmercury)$ concentrations in the water column of the open and marginal areas of the Mediterranean Sea. $MeHg_T $ concentrations ranged from < 0.015 pmol L⁻¹ to 0.430 pmol L⁻¹ (n = 130), with maximal concentrations occurring within the maxima of oxygen consumption. Within the most biologically active zone (0–600 m), the $MeHg_T $ vertical profiles exhibited a nutrient- like pattern. The $MeHg_T $ vs. phosphate relationships were highly significant (p < 0.001), whichever the station. We argue that most of the $MeHg_T $ in the water column originates from in situ methylation of inorganic $MeHg_T $ associated with the regeneration of the organic matter. The demethylation of $MeHg_T $ as water ages seems responsible for the $MeHg_T $ distribution in deep waters. The influences of the methylmercury inputs from the atmosphere, rivers, and coastal or abyssal sediments appear to be locally restricted. |
| doi_str_mv | 10.4319/lo.2009.54.3.0837 |
| format | Article |
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Within the most biologically active zone (0–600 m), the $MeHg_T $ vertical profiles exhibited a nutrient- like pattern. The $MeHg_T $ vs. phosphate relationships were highly significant (p < 0.001), whichever the station. We argue that most of the $MeHg_T $ in the water column originates from in situ methylation of inorganic $MeHg_T $ associated with the regeneration of the organic matter. The demethylation of $MeHg_T $ as water ages seems responsible for the $MeHg_T $ distribution in deep waters. 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Within the most biologically active zone (0–600 m), the $MeHg_T $ vertical profiles exhibited a nutrient- like pattern. The $MeHg_T $ vs. phosphate relationships were highly significant (p < 0.001), whichever the station. We argue that most of the $MeHg_T $ in the water column originates from in situ methylation of inorganic $MeHg_T $ associated with the regeneration of the organic matter. The demethylation of $MeHg_T $ as water ages seems responsible for the $MeHg_T $ distribution in deep waters. 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| subjects | Animal and plant ecology Animal, plant and microbial ecology Biological and medical sciences Earth sciences Earth, ocean, space Exact sciences and technology External geophysics Fundamental and applied biological sciences. Psychology Marine Marine and continental quaternary Physical and chemical properties of sea water Physics of the oceans Sea water ecosystems Surficial geology Synecology |
| title | The Origin of Methylmercury in Open Mediterranean Waters |
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