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Brown bullhead at the St. Lawrence River (Cornwall) Area of Concern: health and endocrine status in the context of tissue concentrations of PCBs and mercury

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Abstract

The St. Lawrence River, at Cornwall Ontario, has accumulated sediment contaminants, mainly mercury (Hg) and polychlorinated biphenyls (PCBs), from industrial point sources over many years. Although those sources are past, the river at Cornwall remains an Area of Concern (AOC). Because of remediation and other changes in the AOC, improved knowledge of contaminants in wild-fish and their putative links to health effects could help decision makers to better assess the AOC’s state. Thus, we compared tissue concentrations of Hg, PCBs, morphometric measures of health, and biomarkers of exposure, metabolic-, and reproductive health in native brown bullhead (Ameiurus nebulosus) from the AOC to those of upstream reference fish. Linear discriminant analysis separated the adult fish of both sexes among upstream and downstream sites without misclassification. Burdens of total-Hg (all sites) and PCB toxic equivalents (downstream sites) exceeded the guidance for the protection of wildlife consumers. There were subtle effects of site on physiological variables, particularly in female fish. Total-Hg in tissue correlated negatively to plasma testosterone and 17β-estradiol in female fish at Cornwall: moreover, concentrations of both hormones were lower within the AOC compared to reference site fish. A similar effect on vitellogenin, which was uncorrelated to E2/T at the downstream sites, indicated the potential for reproductive effects. Downstream fish also had altered thyroidal status (T3, TSH, and ratio of thyroid epithelial cell area to colloid area). Despite spatial and temporal variability of the endocrine-related responses, these subtle effects on fish health within the AOC warrant further study.

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Acknowledgments

The authors acknowledge the contributions of Xiaowa Wang and Amy Sett for total Hg analysis and for coordinating the multi-element analysis. We thank Rimi Kalinauskas of Environment Canada and Jeff Ridal of the St. Lawrence River Institute of Environmental Sciences for general advice and guidance on status of the RAP, and for offering comments on this manuscript. We also thank the following: Jim Bennett and Cheryl Sullivan for gonadal histology; Ruth Vanderveen and Tammy Morgan for binding assays; Chad Boyko, Stacey Clarence, Kelly Cooper, Liisa Heikkila, and Cheryl Tinson for technical support and fieldwork.

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S. B. Brown is deceased

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Pinheiro, M.D.O., Simmons, D.B.D., Villella, M. et al. Brown bullhead at the St. Lawrence River (Cornwall) Area of Concern: health and endocrine status in the context of tissue concentrations of PCBs and mercury. Environ Monit Assess 192, 404 (2020). https://doi.org/10.1007/s10661-020-08355-6

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