Mercury accumulation trends in Florida Everglades and Savannas Marsh flooded soils

Rood, Brian E.; Gottgens, Johan F.; Delfino, Joseph J.; Earle, Celia D. A.; Crisman, Thomas L.

doi:10.1007/bf01189752

Cited by 66 publications

(30 citation statements)

References 13 publications

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“…In the Fanjing Mountains, a natural preservation area near the Hg mining areas in Guizhou Province, similar concentrations have been reported (0.10-0.22 mg kg À1 ) [47]. These concentrations are comparable to values reported for similar areas in Europe and North America: Langtjern, Norway (0.037-0.172 mg kg À1 ) [48]; Florida Everglades National Park, USA (0.02-0.14 mg kg À1 ) [49]; and northeastern Bavaria, Germany (0.120-0.30 mg kg À1 ) [50]. Both urban and rural areas showed evidence of contamination.…”

Section: Environmental Hg In China: a Reviewsupporting

confidence: 84%

Environmental mercury in China: A review

Lin

Vogt

Larssen

2012

Enviro Toxic and Chemistry

108

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Abstract-Mercury is a global pollutant that can be transported over long distances and can bioaccumulate. Currently, China is the country that contributes most to atmospheric Hg emissions and has the greatest intentional (industrial) use of Hg. Mercury in the Chinese environment is generally elevated, particularly in air and water bodies. Remote areas in China also show elevated Hg levels in air and water bodies compared to other rural regions in the world. Large river estuaries are often heavily affected by upstream industrial sources.

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Section: Environmental Hg In China: a Reviewsupporting

confidence: 84%

Environmental mercury in China: A review

Lin

Vogt

Larssen

2012

Enviro Toxic and Chemistry

108

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“…However, it is subject to significant amounts of atmospheric deposition of inorganic mercury (2), which may be biologically transformed to the more toxic methylmercury (CH 3 Hg ϩ , MeHg). Bioaccumulation of methylmercury in the Everglades is of great concern because of its impacts on wildlife (3) and potential impacts on human health (4,5).…”

mentioning

confidence: 99%

Syntrophs Dominate Sequences Associated with the Mercury Methylation-Related Gene hgcA in the Water Conservation Areas of the Florida Everglades

Bae

Dierberg²,

Ogram

2014

Appl Environ Microbiol

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The mechanisms and rates of mercury methylation in the Florida Everglades are of great concern because of potential adverse impacts on human and wildlife health through mercury accumulation in aquatic food webs. We developed a new PCR primer set targeting hgcA, a gene encoding a corrinoid protein essential for Hg methylation across broad phylogenetic boundaries, and used this primer set to study the distribution of hgcA sequences in soils collected from three sites along a gradient in sulfate and nutrient concentrations in the northern Everglades. The sequences obtained were distributed in diverse phyla, including Proteobacteria, Chloroflexi, Firmicutes, and Methanomicrobia; however, hgcA clone libraries from all sites were dominated by sequences clustering within the order Syntrophobacterales of the Deltaproteobacteria (49 to 65% of total sequences). dsrB mRNA sequences, representing active sulfate-reducing prokaryotes at the time of sampling, obtained from these sites were also dominated by Syntrophobacterales (75 to 89%). Laboratory incubations with soils taken from the site low in sulfate concentrations also suggested that Hg methylation activities were primarily mediated by members of the order Syntrophobacterales, with some contribution by methanogens, Chloroflexi, iron-reducing Geobacter, and non-sulfate-reducing Firmicutes inhabiting the sites. This suggests that prokaryotes distributed within clades defined by syntrophs are the predominant group controlling methylation of Hg in low-sulfate areas of the Everglades. Any strategy for managing mercury methylation in the Everglades should consider that net mercury methylation is not limited to the action of sulfate reduction.

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“…Sediment cores show relatively high mercury deposition in the Florida Everglades after 1985 (Rood et al, 1995), and it is likely that mercury deposition was also high in the Savannah River basin at this time.…”

Section: Discussionmentioning

confidence: 99%

“…relatively high mercury accumulation rates after 1985 that likely resulted from global or regional atmospheric deposition (Rood et al, 1995). Mercury deposition rates have also been relatively high elsewhere in the southeastern United States (EPA, 1997;NADP, 2005).…”

Section: Soil Cores From the Florida Everglades In The Southeastern Umentioning

confidence: 99%

Long-term changes in mercury concentrations in fish from the middle Savannah River

Paller

Littrell

2007

Science of The Total Environment

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Mercury accumulation trends in Florida Everglades and Savannas Marsh flooded soils

Cited by 66 publications

References 13 publications

Environmental mercury in China: A review

Environmental mercury in China: A review

Syntrophs Dominate Sequences Associated with the Mercury Methylation-Related Gene hgcA in the Water Conservation Areas of the Florida Everglades

Long-term changes in mercury concentrations in fish from the middle Savannah River

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