Mercury Remediation Technology Development for Lower East Fork Poplar Creek—FY 2017 Progress Report

Peterson, Mark J.; Mayes, Melanie A.; Brooks, Scott C.; Mathews, Teresa J.; Johs, Alexander; Rodríguez, Leroy Goñez; DeRolph, Christopher R.; Pierce, Eric M.; Watson, David B.; Muller, Katherine A.; Olsen, Todd A.; Lowe, Kenneth A.; McManamay, Ryan A.; Smith, J.; Morris, Jesse G.; Jones, Michael

doi:10.2172/1460231

Cited by 5 publications

(5 citation statements)

References 30 publications

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“…Several activities were undertaken to understand the role of different particulate sources in contributing to overall aqueous Hg and MeHg concentrations in EFPC, as well as the contribution of these particulate sources to the bioavailable fraction of Hg and MeHg throughout the creek. The results from this preliminary study confirmed earlier results (Southworth et al 2011) that indicated the presence of the HRD in EFPC and prompted an in-depth investigation to characterize the extent of this high-mercury layer of soil throughout the EFPC floodplain (Peterson et al 2015). The results from these studies also quantified the relative importance of floodplain, streambank, and streambed sediments in contributing to aqueous Hg and MeHg in the creek, highlighting that streambank erosion plays a major role in contributing to Hg and MeHg fluxes in LEFPC.…”

Section: Discussion Of Laboratory Studiessupporting

confidence: 86%

“…Particulate mercury was released more readily into First Creek water than into Clinch River water (which was used for flow augmentation), suggesting that changes in water chemistry due to the shut off of flow augmentation may affect dissolved mercury concentrations, especially in UEFPC. These findings also gave rise to more in-depth studies to characterize the role of water chemistry in controlling mercury dynamics throughout the creek (Peterson et al 2015). Finally, the algal uptake experiments highlight that mercury released from particulate sources is bioavailable and can be taken up by biota at the base of the aquatic food chain.…”

Section: Discussion Of Laboratory Studiesmentioning

confidence: 89%

“…Bank erosion is believed to be a key source of HgT and to a lesser extent MeHg to LEFPC, particularly during storm events when erosion rates are high. As referenced previously, a GPS-based, kayak-mounted, above-water, and underwater video mapping and electronic sensor system was used to survey stream bank and erosion conditions on LEFPC in March and July 2013 (Peterson et al 2015). A modified BEHI score was determined from bank height, bank angle, surface cover, and riparian diversity information.…”

Section: Bank Erosion Estimatesmentioning

confidence: 99%

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Evaluation of Lower East Fork Poplar Creek Mercury Sources

Watson

Brooks

Mathews

et al. 2016

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Thanks are also extended to Dr. Paul Ayers for his unique contribution to the analysis of bank soil fluxes; George Southworth for his contributions to early watershed modeling efforts; and Ami Riscassi and Carrie Miller, who took part in the first year of field work on the project. Maruthi Sridhar Balaji Bhaskar and Maria Martinez provided important contributions to the geospatial analyses, mapping, and data management activities. The authors also want to thank Wendy Hames and Tracy Clem for reporting and editing support.

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Section: Discussion Of Laboratory Studiessupporting

confidence: 86%

Section: Discussion Of Laboratory Studiesmentioning

confidence: 89%

Section: Bank Erosion Estimatesmentioning

confidence: 99%

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Evaluation of Lower East Fork Poplar Creek Mercury Sources

Watson

Brooks

Mathews

et al. 2016

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“…Ultimately, this suggests that high loading of Hg in EFPC from abiotic sources have saturated the EFPC system such that volumes of Hg exceed rates in which microbial communities can efficiently methylate Hg (Brooks & Southworth, ). Because abiotic sources of Hg loading are diffuse and expensive to resolve, more recent Hg remediation efforts have refocused, in part, on manipulating the composition and structure of biological communities, particularly food‐webs (Peterson et al., ).…”

Section: Discussionmentioning

confidence: 99%

Scaling mercury biodynamics from individuals to populations: Implications of an herbivorous fish on mercury cycles in streams

et al. 2019

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Mercury (Hg) is a widespread environmental pollutant anthropogenically released into aquatic ecosystems where it is tightly retained and cycled through abiotic and biotic processes. Understanding the transport and fate of Hg, including the role of organisms in these cycles, is important. However, few studies, if any, have evaluated the role of macroconsumers in Hg cycling. This requires accounting for organismal regulation of body methylmercury (MeHg) via biodynamics and then scaling individual MeHg concentrations to the population level. Recent evidence suggests that MeHg concentrations will become decrease within an organism as it displays higher growth efficiency (i.e. somatic growth dilution [SGD] concept). However, the implications of individual concentrations, SGD, population size, and individual growth on ecosystem‐level mass‐storage and accumulation of MeHg are uncertain. We examined the influence of population size and individual growth on total MeHg standing stock and accumulation in stoneroller (Campostoma oligolepis) populations in a stream contaminated by Hg in east Tennessee, U.S.A. We assessed patterns in periphyton and stoneroller MeHg concentrations in relation to relative growth and population density to determine evidence of SGD and density‐dependent growth, respectively. We simulated the internal regulation of MeHg concentration in stonerollers using a biodynamic model, which was then scaled to the population level to analyse the effects of population density and growth on MeHg standing stock (μg/m2) in stoneroller populations and accumulation rates (i.e. flux, μg m−2 day−1) from periphyton communities to stonerollers. MeHg storage and flux in stoneroller populations were compared to standing stocks and methylation rates in periphyton communities. We found evidence of both density‐dependent and density‐independent growth patterns for stonerollers in East Fork Poplar Creek. Stoneroller MeHg concentrations were positively related to periphyton MeHg concentrations; however, evidence of SGD was equivocal. Total MeHg standing stock and accumulation in stoneroller populations was positively related to population density, irrespective of growth. Additionally, higher relative growth was positively related to a higher MeHg accumulation, regardless of density dependence. We found that the standing stock of MeHg in stoneroller populations could be as high as 32× the standing stock of MeHg in periphyton. Finally, the rate of accumulation of MeHg in stonerollers ranged from 5% to over 100% of previously documented methylation rates in periphyton. Our results suggest that abundant macroconsumers may play significant roles in contaminant cycles by mobilising considerable quantities of Hg, storing significant reservoirs of Hg and MeHg, and transferring MeHg to higher trophic levels. Furthermore, the implications of population size and growth of macroconsumers on the storage and flux of MeHg in streams are complicated and dependent upon age structure, density‐dependence, and MeHg concentrations. Our...

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“…The historical release deposit (HRD) is shown as a distinct layer above the water table. (Source:Peterson et al 2018)…”

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confidence: 99%

Mercury Remediation Technology Development for Lower East Fork Poplar Creek—FY 2021 Update

Mathews¹,

Mayes²,

Brooks³

et al. 2021

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Mercury Remediation Technology Development for Lower East Fork Poplar Creek—FY 2017 Progress Report

Cited by 5 publications

References 30 publications

Evaluation of Lower East Fork Poplar Creek Mercury Sources

Evaluation of Lower East Fork Poplar Creek Mercury Sources

Scaling mercury biodynamics from individuals to populations: Implications of an herbivorous fish on mercury cycles in streams

Mercury Remediation Technology Development for Lower East Fork Poplar Creek—FY 2021 Update

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