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  1. Evaluating the spatial variation of total mercury in young-of-year yellow perch (Perca flavescens), surface water and upland soil for watershed-lake systems within the southern Boreal Shield

    The primary objective of this research is to investigate relationships between mercury in upland soil, lake water and fish tissue and explore the cause for the observed spatial variation of THg in age one yellow perch (Perca flavescens) for ten lakes within the Superior National Forest. Spatial relationships between yellow perch THg tissue...

    Author(s):
    Mark C. Gabriel; Randy Kolka; Trent Wickman; Ed Nater; Laurel Woodruff
    Year:
    2009
    Keywords:
    yellow perch, total mercury, boreal ecosystem, watersheds, regression modeling
    Source:
    Science of the Total Environment. 407: 4117-4126.

  2. Factors Affecting Soil Total Mercury in Seasonal Pond Basins within a Northern Hardwood Forest in Minnesota, USA

    Forest canopies are sites for mercury (Hg) deposition, and forests can act as Hg sources to downstream aquatic environments. This study examined soil total Hg (THg), carbon (C), and nitrogen (N) to 15 cm in 10 seasonal pond basins in a northern hardwood forest in Minnesota. Pools (mass per area) and concentrations (mass per soil mass) of THg to 15 cm were lower in...

    Author(s):
    Mikayla J. Boche; Thomas M. DeSutter; Randall K. Kolka
    Year:
    2019
    Keywords:
    Source:
    Soil Science Society of America Journal

  3. Spatial characteristics of net methylmercury production hot spots in peatlands

    Many wetlands are sources of methylmercury (MeHg) to surface waters, yet little information exists about the distribution of MeHg within wetlands. Total mercury (THg) and MeHg in peat pore waters were studied in four peatlands in spring, summer, and fall 2005. Marked spatial variability in the distribution of MeHg, and %MeHg as a proxy for net MeHg production, was...

    Author(s):
    Carl P.J. Mitchell; Brian A. Branfireun; Randall K. Kolka
    Year:
    2008
    Keywords:
    Source:
    Environmental Science & Technology. 42: 1010-1016.

  4. Mercury budget of an upland-peatland watershed

    Inputs, outputs, and pool sizes of total mercury (Hg) were measured in a forested 10 ha,watershed consisting of a 7 ha hardwood-dominated upland surrounding a 3 ha coniferdominated peatland. Hydrologic inputs via throughfall and stemflow, 13 +/- 0.4/ug m-2 yr-1 over the entire watershed, were about double precipitation...

    Author(s):
    D. F. Grigal; Randy K. Kolka; J. A. Fleck; E. A. Nater
    Year:
    2000
    Keywords:
    atmospheric deposition, litterfall, mercury cycling, wetland, throughfall
    Source:
    Biogeochemistry. Vol. 50 p. 95-109. (2000)

  5. Latent effect of soil organic matter oxidation on mercury cycling within a southern boreal ecosystem

    The focus of this study is to investigate processes causing the observed spatial variation of total mercury (THg) in the soil O horizon of watersheds within the Superior National Forest (Minnesota) and to determine if results have implications toward understanding long-term changes in THg concentrations for resident fish. Principal component analysis was used to...

    Author(s):
    Mark Gabriel; Randy Kolka; Trent Wickman; Laurel Woodruff; Ed. Nater
    Year:
    2012
    Keywords:
    Source:
    Journal of Environment Quality. 41(2): 495-505.

  6. The effects of hydrologic fluctuation and sulfate regeneration on mercury cycling in an experimental peatland

    A series of severe droughts during the course of a long-term, atmospheric sulfate-deposition experiment in a boreal peatland in northern Minnesota created a unique opportunity to study how methylmercury (MeHg) production responds to drying and rewetting events in peatlands under variable levels of sulfate loading. Peat oxidation during extended dry periods mobilized...

    Author(s):
    J.K. Coleman Wasik; D.R. Engstrom; C.P.J. Mitchell; E.B. Swain; B.A. Monson; S.J. Balogh; J.D. Jeremiason; B.A. Branfireun; R.K. Kolka; J.E. Almendinger
    Year:
    2015
    Keywords:
    methylmercury, peatlands, drought, sulfate deposition, sulfur cycling
    Source:
    Journal of Geophysical Research: Biogeosciences. 120(9): 1697-1715.
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