Abstract
We evaluated spatiotemporal changes in the mean and variation in largemouth bass (Micropterus salmoides) mercury concentrations over three discrete time periods (1995, 2005–2006, and 2019–2021) across 56 Connecticut waterbodies. We detected largemouth bass raw mercury concentrations that exceeded the US Environmental Protection Agency (USEPA) Fish Tissue Residue Criterion (≥ 0.30 µg g−1 ww) in 75.1%, 63.3%, and 47.7% of all fish sampled during 1995, 2005–2006, and 2019–2021, respectively. Total length (TL)-adjusted largemouth bass mercury concentrations declined across all ecoregions in Connecticut between subsequent sampling periods but increased between 2005–2006 and 2019–2021 in the Northwest Hills/Uplands ecoregion. The coefficient of variation (CV) of largemouth bass TL-adjusted mercury concentrations increased through time, increasing from 25.78% during 1995 to 36.47% during 2019–2021. The probability of a largemouth bass having a raw mercury concentration > 0.30 µg g−1 ww increased with total length (TL), but the TL with a 50% probability varied across ecoregions and periods. The variation in largemouth bass mercury concentrations highlights the roles that changes to individual behaviors, food web structure, lake properties, and legacy mercury may play in shaping broad patterns and trends in mercury consumption risks.
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Acknowledgements
We thank R. Flamenco, P. Grundy, S. Manstan, M. Upp, and numerous Connecticut Department of Energy and Environmental Protection (CT DEEP) fishery biologists for their help sampling largemouth bass. Sample collection of largemouth bass was performed under the auspices of the University of Connecticut’s Institutional Animal Care and Use Committee (IACUC) protocol A19-029, and bass were collected under state scientific collection permit SC-19016. We thank J. Brandt, M. Lally and the anonymous reviewers for comments that improved earlier drafts of this manuscript.
Funding
Funding for this study was administered by the Connecticut Department of Environmental Protection (CT DEEP), with support from the New England Interstate Water Pollution Control Commission (NEIWPCC), through a United States Environmental Protection Agency Clean Water Act Sect. 604(b) Water Quality Management Planning Grant (award number: AG191197).
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JV designed the study. CS collected the data. CP processed tissue samples. CS analyzed the data. CS wrote the manuscript. CS, JV, and CP edited the manuscript.
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Sullivan, C.J., Vokoun, J.C. & Perkins, C.R. Spatiotemporal changes in largemouth bass mercury concentrations from Connecticut waterbodies, 1995–2021. Environ Monit Assess 195, 780 (2023). https://doi.org/10.1007/s10661-023-11405-4
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DOI: https://doi.org/10.1007/s10661-023-11405-4