Concentration, Distribution, and Bioavailability of Mercury and Methylmercury in Sediments of Baltimore Harbor Andchesapeake Bay, Maryland, Usa

Lawrence, Angie L.

doi:10.1897/1551-5028(1999)018<2438:cdabom>2.3.co;2

Cited by 8 publications

(5 citation statements)

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“…The THg and MMHg concentrations in the sediment widely varied from 0.4 to 10.4 ng g À1 and from 0.03 (detection limit) to 0.08 ng g À1 , respectively, which were in the low range of reported values in other coastal and estuarine areas [45,61,62,65]. .…”

Section: Hg and Se Concentrations In Environments And Food Web Basesmentioning

confidence: 75%

“…5, pp. , 2013 # 2013 SETAC Printed in the USA DOI: 10.1002/etc.2169 MMHg, and total Se (TSe) concentrations in the food web of Sarasota Bay, Florida, USA, were determined to investigate the relative degree of Hg and Se bioaccumulation and biomagnification and to assess the Hg-uptake risks of Sarasota Bay resident bottlenose dolphins using d 13 C and d 15 N. Sarasota Bay was chosen as a model ecosystem since it is an estuarine and coastal environmental setting that generally receives Hg input from its watershed and atmosphere yet supports a variety of coastal and marine species [44,45]. In addition, bottlenose dolphins (Tursiops truncatus) are found in the bay with multidecadal and year-round residency, and there is a robust database on the ecology and health of these marine mammals [46][47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

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Bioaccumulation and Biomagnification of Mercury and Selenium in the Sarasota Bay Ecosystem

Hong

Hull

Rifkin

et al. 2013

Enviro Toxic and Chemistry

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The bioaccumulation and biomagnification of Hg and Se were investigated in Sarasota Bay, Florida, USA, to characterize the Hg exposure risks to wild bottlenose dolphins in the bay. Concentrations of total mercury (THg), monomethylmercury (MMHg), and total selenium (TSe) were monitored in the bay, the latter of which might reduce Hg toxicity. The food web structure and dolphins' trophic level-specific consumption rates were evaluated using stable isotope ratios of carbon (δ(13) C) and nitrogen (δ(15) N). Regressions developed for Hg biomagnification in the food chain were log10 CTHg (nanograms per gram) =0.27 × δ(15) N (‰) - 0.42, R(2) =0.87, for THg and log10 CMMHg =0.33 × δ(15) N (‰) - 1.0, R(2) =0.93, for MMHg. Unlike Hg, nearly constant TSe concentrations were observed at 248 ± 179 ng g(-1) in the food web, and the TSe-to-THg molar ratio was predicted by log10 (CTSe /CTHg ) = -0.10 × δ(15) N (‰) +2.8, R(2) =0.60. The THg-uptake rates of Sarasota bottlenose dolphins are estimated to vary between 2.1 and 4.9 µg kg(-1) d(-1) ; however, the estimated TSe-uptake rates (15.1 µg kg(-1) d(-1) ) were higher than those for THg, and the Hg-exposure risks of the Sarasota Bay resident bottlenose dolphins are considered to be low. Approaches employed in the present study can be extended to other environments to characterize Hg contamination in aquatic systems and Hg exposure risks in top predators.

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Section: Hg and Se Concentrations In Environments And Food Web Basesmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Bioaccumulation and Biomagnification of Mercury and Selenium in the Sarasota Bay Ecosystem

Hong

Hull

Rifkin

et al. 2013

Enviro Toxic and Chemistry

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“…When these plankton die, a fraction of the POC produced sinks into deeper waters (better known as the export flux or particle rain) [Feely et al, 2004;Schlitzer, 2004]. Inorganic Hg(II) is strongly sorbed by organic matter in the water column and transported to deeper waters with sinking POC [Mason and Fitzgerald, 1993;Mason and Lawrence, 1999]. Remineralization of sinking POC by heterotrophic bacteria in subsurface waters results in consumption of oxygen and releases carbon, nutrients, and sorbed Hg(II) back to the water column [Feely et al, 2004;Mason et al, 1998].…”

Section: Supply Of Hg(ii) To Subsurface Watersmentioning

confidence: 99%

Mercury sources, distribution, and bioavailability in the North Pacific Ocean: Insights from data and models

Sunderland

Krabbenhoft

Moreau

et al. 2009

Global Biogeochemical Cycles

386

473

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Fish harvested from the Pacific Ocean are a major contributor to human methylmercury (MeHg) exposure. Limited oceanic mercury (Hg) data, particularly MeHg, has confounded our understanding of linkages between sources, methylation sites, and concentrations in marine food webs. Here we present methylated (MeHg and dimethylmercury (Me2Hg)) and total Hg concentrations from 16 hydrographic stations in the eastern North Pacific Ocean. We use these data in combination with information from previous cruises and coupled atmospheric‐oceanic modeling results to better understand controls on Hg concentrations, distribution, and bioavailability. Total Hg concentrations (average 1.14 ± 0.38 pM) are elevated relative to previous cruises. Modeling results agree with observed increases and suggest that at present atmospheric Hg deposition rates, basin‐wide Hg concentrations will double relative to circa 1995 by 2050. Methylated Hg accounts for up to 29% of the total Hg in subsurface waters (average 260 ± 114 fM). We observed lower ambient methylated Hg concentrations in the euphotic zone and older, deeper water masses, which likely result from decay of MeHg and Me2Hg when net production is not occurring. We found a significant, positive linear relationship between methylated Hg concentrations and rates of organic carbon remineralization (r2 = 0.66, p < 0.001). These results provide evidence for the importance of particulate organic carbon (POC) transport and remineralization on the production and distribution of methylated Hg species in marine waters. Specifically, settling POC provides a source of inorganic Hg(II) to microbially active subsurface waters and can also provide a substrate for microbial activity facilitating water column methylation.

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“…Higher MeHg concentrations were found in sediment from MA (9.07 ± 3.00 ng g –1 dw, n = 3, Tukey’s HSD test p < 0.05) compared to MC and the three sites on the perimeter of Raritan Bay (Figure b, Table S5). The high MeHg concentration in MA sediment is greater than those in sediment from most sites in the northeastern U.S., which are generally below 5 ng g –1 (dw) and occasionally exceed 8 ng g –1 (dw). ,,,,, NC sediments had intermediate MeHg concentrations that were not significantly different from either MA or the other four sites. The highest MeHg% was observed in LC (1.45 ± 0.31%, n = 3, Figure c, Table S5), which is one of the sites with the lowest levels of THg and MeHg.…”

Section: Resultsmentioning

confidence: 83%

“…The high MeHg concentration in MA sediment is greater than those in sediment from most sites in the northeastern U.S., which are generally below 5 ng g −1 (dw) and occasionally exceed 8 ng g −1 (dw). 23,32,34,35,58,59 MA or the other four sites. The highest MeHg% was observed in LC (1.45 ± 0.31%, n = 3, Figure 2c, Table S5), which is one of the sites with the lowest levels of THg and MeHg.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Grass Shrimp (Palaemonetes pugio) as a Trophic Link for Methylmercury Accumulation in Urban Salt Marshes

Wallace

Reinfelder

2022

Environ. Sci. Technol.

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Grass shrimp (Palaemonetes pugio) represent a potential link in the transfer of methylmercury (MeHg) from salt marsh sediments to transient young-of-the-year (YOY) fish. Across six salt marshes subject to varying degrees of Hg contamination, MeHg concentration in grass shrimp was significantly correlated with MeHg in sediment (p < 0.05, R 2 = 0.81). Bioenergetic models show that grass shrimp alone account for 12–90% of MeHg observed in YOY striped bass and 6–22% of MeHg in YOY summer flounder. Direct accumulation of MeHg from grass shrimp to YOY fish increased with MeHg levels in grass shrimp and sediment. However, in the most contaminated salt marshes with the highest levels of MeHg in grass shrimp and sediment, indirect accumulation of MeHg from grass shrimp by YOY summer flounder, whose diet is dominated by benthic forage fish (mummichog), is predicted to plateau because higher concentrations of MeHg in grass shrimp are offset by a lower proportion of grass shrimp in the mummichog diet. Our results demonstrate that grass shrimp are an important trophic link in the bioaccumulation of MeHg in salt marsh food webs and that MeHg accumulation in YOY fish varies with both the concentration of MeHg in salt marsh sediments and benthic food web structure.

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Concentration, Distribution, and Bioavailability of Mercury and Methylmercury in Sediments of Baltimore Harbor Andchesapeake Bay, Maryland, Usa

Cited by 8 publications

References 0 publications

Bioaccumulation and Biomagnification of Mercury and Selenium in the Sarasota Bay Ecosystem

Bioaccumulation and Biomagnification of Mercury and Selenium in the Sarasota Bay Ecosystem

Mercury sources, distribution, and bioavailability in the North Pacific Ocean: Insights from data and models

Grass Shrimp (Palaemonetes pugio) as a Trophic Link for Methylmercury Accumulation in Urban Salt Marshes

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