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Mercury transfer in a subtropical coastal lagoon food web (SE Gulf of California) under two contrasting climatic conditions
Mercury (Hg) transference through an established and defined food web from an urbanized subtropical coastal lagoon (SE Gulf of California) was examined by using carbon and nitrogen stable isotope and Hg analyses. Concentrations of Hg in seawater (0.045–0.078 μg L−1), predominantly incorporated to the particulate fraction (60% of total), were lower than those found in highly contaminated coastal areas around the world (0.18–16 μg L−1). Although levels of Hg available for the biota (e.g., associated to the reactive and pyrite fractions; 0.11–0.15 μg g−1) were within of effects range‐low (ER‐L, 0.15–0.71 μg g−1) these concentrations represented from 46.6 to 67.0% of the total Hg pool that may be transferred through food web. The sequence of bio‐accumulation of Hg in studied species was according with their functional guild: tertiary consumer (0.85–1.15 μg g−1) > secondary consumers (0.084–0.168 μg g−1) > primary consumers (0.014–0.160 μg g−1) > primary producers (0.016–0.056 μg g−1). Hg concentrations increased for each successive trophic position estimate through δ15N isotopic values, although these relationships showed differences between dry and rainy seasons (R2 = 0.37 and R2 = 0.39 between δ15N vs. Hg in organisms, respectively). We concluded that Hg is being positively transferred (biomagnification factor >1) through the studied food web probably enhanced by the favorable environmental conditions for Hg‐methylation (e.g., fine sediments rich in organic matter, and environmental conditions changes of the redox, pH, and temperature) found in this urbanized coastal water, however, the study of processes methlylation and biomagnifcation of Hg need further investigations. © 2011Wiley Periodicals, Inc. Environ Toxicol, 2012.
Mercury transfer in a subtropical coastal lagoon food web (SE Gulf of California) under two contrasting climatic conditions
Mercury (Hg) transference through an established and defined food web from an urbanized subtropical coastal lagoon (SE Gulf of California) was examined by using carbon and nitrogen stable isotope and Hg analyses. Concentrations of Hg in seawater (0.045–0.078 μg L−1), predominantly incorporated to the particulate fraction (60% of total), were lower than those found in highly contaminated coastal areas around the world (0.18–16 μg L−1). Although levels of Hg available for the biota (e.g., associated to the reactive and pyrite fractions; 0.11–0.15 μg g−1) were within of effects range‐low (ER‐L, 0.15–0.71 μg g−1) these concentrations represented from 46.6 to 67.0% of the total Hg pool that may be transferred through food web. The sequence of bio‐accumulation of Hg in studied species was according with their functional guild: tertiary consumer (0.85–1.15 μg g−1) > secondary consumers (0.084–0.168 μg g−1) > primary consumers (0.014–0.160 μg g−1) > primary producers (0.016–0.056 μg g−1). Hg concentrations increased for each successive trophic position estimate through δ15N isotopic values, although these relationships showed differences between dry and rainy seasons (R2 = 0.37 and R2 = 0.39 between δ15N vs. Hg in organisms, respectively). We concluded that Hg is being positively transferred (biomagnification factor >1) through the studied food web probably enhanced by the favorable environmental conditions for Hg‐methylation (e.g., fine sediments rich in organic matter, and environmental conditions changes of the redox, pH, and temperature) found in this urbanized coastal water, however, the study of processes methlylation and biomagnifcation of Hg need further investigations. © 2011Wiley Periodicals, Inc. Environ Toxicol, 2012.
Mercury transfer in a subtropical coastal lagoon food web (SE Gulf of California) under two contrasting climatic conditions
Jara‐Marini, Martin E. (author) / Soto‐Jiménez, Martín F. (author) / Páez‐Osuna, Federico (author)
Environmental Toxicology ; 27 ; 526-536
2012-09-01
11 pages
Article (Journal)
Electronic Resource
English
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