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• W2753889355 abstract "Recent increases in dam removals have prompted research on ecological and geomorphic river responses, yet contaminant dynamics following dam removals are poorly understood. We investigated changes in sediment concentrations and fish-community body burdens of mercury (Hg), selenium (Se), polychlorinated biphenyls (PCB), and chlorinated pesticides before and after two lowhead dam removals in the Scioto and Olentangy Rivers (Columbus, Ohio). These changes were then related to documented shifts in fish food-web structure. Seven study reaches were surveyed from 2011 to 2015, including controls, upstream and downstream of the previous dams, and upstream restored vs. unrestored. For most contaminants, fish-community body burdens declined following dam removal and converged across study reaches by the last year of the study in both rivers. Aldrin and dieldrin body burdens in the Olentangy River declined more rapidly in the upstream-restored vs. the upstream-unrestored reach, but were indistinguishable by year three post dam removal. No upstream-downstream differences were observed in body burdens in the Olentangy River, but aldrin and dieldrin body burdens were 138 and 148% higher, respectively, in downstream reaches than in upstream reaches of the Scioto River following dam removal. The strongest relationships between trophic position and body burdens were observed with PCBs and Se in the Scioto River, and with dieldrin in the Olentangy River. Food-chain length - a key measure of trophic structure - was only weakly related to aldrin body burdens, and unrelated to other contaminants. Overall, we demonstrate that lowhead dam removal may effectively reduce ecosystem contamination, largely via shifts in fish food-web dynamics versus sediment contaminant concentrations. This study presents some of the first findings documenting ecosystem contamination following dam removal and will be useful in informing future dam removals." @default.
• W2753889355 created "2017-09-15" @default.
• W2753889355 creator A5019176817 @default.
• W2753889355 creator A5022261967 @default.
• W2753889355 creator A5082883284 @default.
• W2753889355 date "2017-12-01" @default.
• W2753889355 modified "2023-10-12" @default.
• W2753889355 title "Reductions in fish-community contamination following lowhead dam removal linked more to shifts in food-web structure than sediment pollution" @default.
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• W2753889355 doi "https://doi.org/10.1016/j.envpol.2017.07.096" @default.
• W2753889355 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28850935" @default.
• W2753889355 hasPublicationYear "2017" @default.
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