Landscape Controls on Mercury in Streamwater at Acadia National Park, USA

Peckenham, John M.; Kahl, Jeffrey S.; Nelson, Sarah J.; Johnson, K. B.; Haines, Terry A.

doi:10.1007/s10661-006-9334-2

Cited by 9 publications

(10 citation statements)

References 28 publications

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“…Dissolved organic carbon binds Hg, assisting in its transport from neighboring wetlands to the lake and increasing bioavailability for methylation [31].…”

Section: Food Web Applicationsmentioning

confidence: 99%

“…Peckenham et al [31] found that wetlands mobilized more Hg from watershed than uplands by producing more DOC, even though upland could transport more Hg per unit of DOC.…”

Section: Food Web Applicationsmentioning

confidence: 99%

“…A method to estimate the water MeHg:THg ratio within the model was derived from equations used to predict MeHg (r 2 ¼ 0.53) and THg (r 2 ¼ 0.75) using dissolved organic carbon (DOC) [30]. Dissolved organic carbon binds Hg, assisting in its transport from neighboring wetlands to the lake and increasing bioavailability for methylation [31].…”

Section: Water Mehg:thg Ratiomentioning

confidence: 99%

“…Since the relative amount of methylated Hg tends to be highest in wetland areas, those watersheds with extensive wetlands should have more MeHg per unit of THg available than lakes with little to no surrounding wetland [32]. Peckenham et al [31] found that wetlands mobilized more Hg from watershed than uplands by producing more DOC, even though upland could transport more Hg per unit of DOC.…”

Section: Water Mehg:thg Ratiomentioning

confidence: 99%

“…Meng et al [31] developed a series of linear equations to model DOC, THg, and MeHg in freshwater lakes located within Kejimkujik Park, Nova Scotia. Dissolved organic carbon was found to be a good predictor of THg concentration in the water column (r 2 ¼ 0.75).…”

Section: Concentration Of Thg In Watermentioning

confidence: 99%

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Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

Ethier

Lean

Scheuhammer

et al. 2010

Environmental Toxicology and Chemistry

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The purpose of the present study was to evaluate the mercury (Hg) Environmental Ratios Multimedia Ecosystem Sources (HERMES) model on two Ontario, Canada lakes (Harp and Dickie) and to include modifications to enable the model to estimate the major model input variables that tend to be missing for lakes with limited datasets. No significant differences were found for either sediment solid or bulk water total mercury (THg) when the HERMES model was applied to the two Ontario lakes, regardless of whether all available data were altered during application or only the 10 variables that tend to cause the most variation in model output (i.e., concentration of THg in atmosphere, water inflow THg concentration, water inflow rate, water volume, surface area, mean depth, suspended particulate matter concentration, settling rate of solids in water column, water temperature, and precipitation rate). Since measured sediment and water THg values do not exist for most lakes removed from industrial activities, empirical relationships were incorporated into the HERMES model framework to provide a method to double-check model output for lakes where this information is unavailable.

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“…Dissolved organic carbon binds Hg, assisting in its transport from neighboring wetlands to the lake and increasing bioavailability for methylation [31].…”

Section: Food Web Applicationsmentioning

confidence: 99%

“…Peckenham et al [31] found that wetlands mobilized more Hg from watershed than uplands by producing more DOC, even though upland could transport more Hg per unit of DOC.…”

Section: Food Web Applicationsmentioning

confidence: 99%

Section: Water Mehg:thg Ratiomentioning

confidence: 99%

Section: Water Mehg:thg Ratiomentioning

confidence: 99%

Section: Concentration Of Thg In Watermentioning

confidence: 99%

See 3 more Smart Citations

Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

Ethier

Lean

Scheuhammer

et al. 2010

Environmental Toxicology and Chemistry

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Understanding sources of methylmercury in songbirds with stable mercury isotopes: Challenges and future directions

Tsui

Adams

Jackson

et al. 2017

Environmental Toxicology and Chemistry

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Mercury (Hg) stable isotope analysis is an emerging technique that has contributed to a better understanding of many aspects of the biogeochemical cycling of Hg in the environment. However, no study has yet evaluated its usefulness in elucidating the sources of methylmercury (MeHg) in songbird species, a common organism for biomonitoring of Hg in forested ecosystems. In the present pilot study, we examined stable mercury isotope ratios in blood of 4 species of songbirds and the invertebrates they are likely foraging on in multiple habitats in a small watershed of mixed forest and wetlands in Acadia National Park in Maine (USA). We found distinct isotopic signatures of MeHg in invertebrates (both mass-dependent fractionation [as d 202 Hg] and mass-independent fractionation [as D 199 Hg]) among 3 interconnected aquatic habitats. It appears that the Hg isotopic compositions in bird blood cannot be fully accounted for by the isotopic compositions of MeHg in lower trophic levels in each of the habitats examined. Furthermore, the bird blood isotope results cannot be simply explained by an isotopic offset as a result of metabolic fractionation of d 202 Hg (e.g., internal demethylation). Our results suggest that many of the birds sampled obtain MeHg from sources outside the habitat they were captured in. Our findings also indicate that massindependent fractionation is a more reliable and conservative tracer than mass-dependent fractionation for identifying sources of MeHg in bird blood. The results demonstrate the feasibility of Hg isotope studies of songbirds but suggest that larger numbers of samples and an expanded geographic area of study may be required for conclusive interpretation. Environ Toxicol Chem 2018;37:166-174. C 2017 SETAC

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Watershed Nitrogen and Mercury Geochemical Fluxes Integrate Landscape Factors in Long-term Research Watersheds at Acadia National Park, Maine, USA

Kahl

Nelson

Fernandez

et al. 2006

Environ Monit Assess

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This paper is an overview of this special issue devoted to watershed research in Acadia National Park (Acadia NP). The papers address components of an integrated research program on two upland watersheds at Acadia NP, USA (44 degrees 20' N latitude; 68 degrees 15' E longitude). These watersheds were instrumented in 1998 to provide a long-term foundation for regional ecological and watershed research. The research was initiated as part of EPA/NPS PRIMENet (Park Research and Intensive Monitoring of Ecosystems Network), a system of UV-monitoring stations and long-term watershed research sites located in US national parks. The initial goals at Acadia NP were to address research questions about mercury, acid rain, and nitrogen saturation developed from prior research. The project design was based on natural differences in forests and soils induced by an intense wildfire in one watershed in 1947. There is no evidence of fire in the reference watershed for several hundred years. We are testing hypotheses about controls on surface water chemistry, and bioavailability of contaminants in the contrasting watersheds. The unburned 47-ha Hadlock Brook watershed is 70% spruce-fir mature conifer forest. In contrast, burned 32-ha Cadillac Brook watershed, 4 km northeast of the Hadlock watershed, is 20% regenerating mixed northern hardwoods and 60% shrub/rocky balds. Differences in atmospheric deposition are controlled primarily by forest stand composition and age. The watersheds are gauged and have water chemistry stations at 122 m (Cadillac) and 137 m (Hadlock); watershed maximum elevations are 468 and 380 m, respectively. The stream water chemistry patterns reflect, in part, the legacy of the intense fire, which, in turn, controls differences in forest vegetation and soil characteristics. These factors result in higher nitrogen and mercury flux from the unburned watershed, reflecting differences in atmospheric deposition, contrasting ecosystem pools of nitrogen and mercury, and inferred differences in internal cycling and bioavailabilty.

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Landscape Controls on Mercury in Streamwater at Acadia National Park, USA

Cited by 9 publications

References 28 publications

Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

Predicting mercury concentrations and fluxes in the water column and sediment of lakes with a limited dataset

Understanding sources of methylmercury in songbirds with stable mercury isotopes: Challenges and future directions

Watershed Nitrogen and Mercury Geochemical Fluxes Integrate Landscape Factors in Long-term Research Watersheds at Acadia National Park, Maine, USA

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