Abstract
Mercury (Hg) is a toxic pollutant, widespread in northeastern US ecosystems. Resource managers’ efforts to develop fish consumption advisories for humans and to focus conservation efforts for fish-eating wildlife are hampered by spatial variability. Dragonfly larvae can serve as biosentinels for Hg given that they are widespread in freshwaters, long-lived, exhibit site fidelity, and bioaccumulate relatively high mercury concentrations, mostly as methylmercury (88% ± 11% MeHg in this study). We sampled lake water and dragonfly larvae in 74 northeastern US lakes that are part of the US EPA Long-Term Monitoring Network, including 45 lakes in New York, 43 of which are in the Adirondacks. Aqueous dissolved organic carbon (DOC) and total Hg (THg) were strongly related to MeHg in lake water. Dragonfly larvae total mercury ranged from 0.016–0.918 μg/g, dw across the study area; Adirondack lakes had the minimum and maximum concentrations. Aqueous MeHg and dragonfly THg were similar between the Adirondack and Northeast regions, but a majority of lakes within the highest quartile of dragonfly THg were in the Adirondacks. Using landscape, lake chemistry, and lake morphometry data, we evaluated relationships with MeHg in lake water and THg in dragonfly larvae. Lakewater DOC and lake volume were strong predictors for MeHg in water. Dragonfly THg Bioaccumulation Factors (BAFs, calculated as [dragonfly THg]:[aqueous MeHg]) increased as lake volume increased, suggesting that lake size influences Hg bioaccumulation or biomagnification. BAFs declined with increasing DOC, supporting a potential limiting effect for MeHg bioavailability with higher DOC.
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Acknowledgements
Capable field crews made this project possible: A. Baumann, H. Roebuck Broadley, M. Prakash, C. Schmitt, K. Johnson, J. McKay, S. Edmonds, K. Warner. Dartmouth lab staff (B. Jackson, C. McCleery, H. Roebuck Broadley, K. Buckman) were instrumental in sample identification, processing, and analysis. Pam Hunt of NH Audubon assisted with dragonfly sample identification. David Krabbenhoft of the USGS-Wisconsin Water Science Center helped develop the project and provided input on an early draft of this manuscript. The Adirondack Lakes Survey Corporation sampled many Adirondack Lakes for water Hg and dragonfly larvae and provided logistical support for Maine-based crews sampling in the Adirondack region. K. Roy provided information about the Adirondack study lakes. A. Klemmer provided information regarding foodweb influence and discussion. Staff from state and tribal resource management agencies assisted with permitting and local contacts.
Funding
This project was supported by the Northeastern States Research Cooperative through funding made available by the USDA Forest Service. The US Environmental Protection Agency-US Geological Survey LTM/TIME project was funded by EPA ORD and EPA CAMD (IAG 06HQGR0143), processed through Grant/Cooperative Agreement G11AP20128 from the US Geological Survey. This research was also supported by the National Institutes of Health Grant P42 ESO7373 from the National Institute of Environmental Health Sciences. The Adirondack Lakes Survey Corporation, Adirondack Long Term Monitoring work was supported by the New York State Energy Research and Development Authority, the New York State Department of Environmental Conservation Division of Air Resources and the US EPA Clean Air Markets Division. This manuscript has not been subjected to agency review and no official endorsement by any agency should be inferred.
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Nelson, S.J., Chen, C.Y. & Kahl, J.S. Dragonfly larvae as biosentinels of Hg bioaccumulation in Northeastern and Adirondack lakes: relationships to abiotic factors. Ecotoxicology 29, 1659–1672 (2020). https://doi.org/10.1007/s10646-019-02149-4
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DOI: https://doi.org/10.1007/s10646-019-02149-4