Abstract
Mercury is a persistent, biomagnifying contaminant that can cause negative behavioral, immunological, and reproductive effects in wildlife and human populations. We examined the role of wetland water-management on mercury bioaccumulation in songbirds and ducks at Kellys Slough National Wildlife Refuge Complex, near Grand Forks, North Dakota USA. We assessed mercury concentrations in blood of wetland-foraging songbirds (80 common yellowthroats [Geothlypis trichas] and 14 Nelson’s sparrows [Ammospiza nelsoni]) and eggs of upland-nesting ducks (28 gadwall [Mareca strepera], 19 blue-winged teal [Spatula discors], and 13 northern shoveler [S. clypeta]) across four wetland water-management classifications. Nelson’s sparrow blood mercury concentrations were elevated (mean: 1.00 µg/g ww; 95% CL: 0.76–1.31) and similar to those reported 6 years previously. Mercury in songbird blood and duck eggs varied among wetland water-management classifications. Songbirds and ducks had 67% and 49% lower mercury concentrations, respectively, when occupying wetlands that were drawn down with water flow compared to individuals occupying isolated-depressional wetlands with no outflow. Additionally, songbirds within impounded and partially drawn-down wetland units with water flow had mercury concentrations that were 26–28% lower, respectively, than individuals within isolated-depressional wetlands with no outflow. Our results confirm that mercury concentrations in songbirds at Kellys Slough continue to be elevated and suggest that water-management could be an important tool for wetland managers to reduce bioaccumulation of mercury in birds.
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Data availability
Data used in this paper are available in the public domain from the USGS ScienceBase data repository (Winder et al. 2018).
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Acknowledgements
We thank Matt Sprenger, Brian Vose, Matt VanThuyne, Brandon Hanson, Taylor Uphoff, Richard Rosenlof, and Eric Weber for help with egg collection. We also thank Mason Ryckman and Jonathan Metz for assistance in processing duck eggs in preparation for lab analyses. We thank Matt Toney, Mark Herzog, and Sarah Peterson for mercury laboratory analysis and coordination. We thank Kristen Rundquist at the Grand Forks Air Force Base for assistance with housing. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Funding
For funding and support of laboratory and field work, we thank the U.S. Fish and Wildlife Service’s National Wildlife Health Office and Devils Lake Wetland Management District, and the U.S. Geological Survey’s Northern Prairie Wildlife Research Center and Western Ecological Research Center. Samantha E. J. Gibbs, DVM, Ph.D. and Lee C. Jones provided help in securing funding. JTA was partially funded by the U.S. Geological Survey Environmental Health Mission Area’s Contaminant Biology Program. MJA and LDI were funded by the U.S. Geological Survey’s Northern Prairie Wildlife Research Center.
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Winder, V.L., Anteau, M.J., Fisher, M.R. et al. Wetland water-management may influence mercury bioaccumulation in songbirds and ducks at a mercury hotspot. Ecotoxicology 29, 1229–1239 (2020). https://doi.org/10.1007/s10646-019-02143-w
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DOI: https://doi.org/10.1007/s10646-019-02143-w