Abstract
The risk of mercury (Hg) exposure to humans and wildlife from fish consumption has driven extensive mercury analysis throughout the Great Lakes Region since the 1970s. This study compiled fish-Hg data from multiple sources in the region and assessed spatiotemporal trends of Hg concentrations in two representative top predator fish species. Walleye (Sander vitreus) and largemouth bass (Micropterus salmoides) were chosen for the trend analysis because they had more Hg records (63,872) than other fish species that had been sampled from waters throughout the region. Waterbody types were inland lakes (70%), the Great Lakes, impoundments, and rivers. The compiled datasets were analyzed with a mixed effects statistical model having random effects of station, year, and fish length; and fixed effects of year, tissue type, fish length, habitat, and season. The results showed a generally declining temporal trend in fish-Hg for the region (1970–2009), with spatial trends of increasing Hg concentration from south to north and from west to east across the region. Nonlinearity was evident in the general downward trends of Ontario walleye, with a shift to an upward trend beginning in the 1990s. Only ongoing monitoring can reveal if this upward shift is an oscillation in a long-term decline, a statistical anomaly, or a sustained declining temporal trend in regional fish-Hg concentrations.
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Acknowledgments
We thank the tribal, state, provincial, and federal agencies for sharing their fish monitoring data. This project was made possible by the energetic leadership of David Evers and James Wiener. We greatly appreciate their efforts to conceive of and organize the Great Lakes Hg Project. We also appreciate the BioDiversity Research Institute’s compilation of MercNet and maintenance of the project web site. We thank the two anonymous reviewers for their thoughtful comments and suggestions to improve the draft manuscript. Funding for D. Staples and K. Williams was provided by a grant to BioDiversity Research Institute from the Great Lake Commission’s Great Lakes Atmospheric Deposition program.
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Monson, B.A., Staples, D.F., Bhavsar, S.P. et al. Spatiotemporal trends of mercury in walleye and largemouth bass from the Laurentian Great Lakes Region. Ecotoxicology 20, 1555–1567 (2011). https://doi.org/10.1007/s10646-011-0715-0
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DOI: https://doi.org/10.1007/s10646-011-0715-0