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• W4367181766 endingPage "121678" @default.
• W4367181766 startingPage "121678" @default.
• W4367181766 abstract "Mercury (Hg) is a widespread element and persistent pollutant, harmful to fish, wildlife, and humans in its organic, methylated form. The risk of Hg contamination is driven by factors that regulate Hg loading, methylation, bioaccumulation, and biomagnification. In remote locations, with infrequent access and limited data, understanding the relative importance of these factors can pose a challenge. Here, we assessed Hg concentrations in an apex predator fish species, lake trout (Salvelinus namaycush), collected from 14 lakes spanning two National Parks in southwest Alaska, U.S.A. We then examined factors associated with the variation in fish Hg concentrations using a Bayesian hierarchical model. We found that total Hg concentrations in water were consistently low among lakes (0.11-0.50 ng L-1). Conversely, total Hg concentrations in lake trout spanned a thirty-fold range (101-3046 ng g-1 dry weight), with median values at 7 lakes exceeding Alaska's human consumption threshold. Model results showed that fish age and, to a lesser extent, body condition best explained variation in Hg concentration among fish within a lake, with Hg elevated in older, thinner lake trout. Other factors, including plankton methyl Hg content, fish species richness, volcano proximity, and glacier loss, best explained variation in lake trout Hg concentration among lakes. Collectively, these results provide evidence that multiple, hierarchically nested factors control fish Hg levels in these lakes." @default.
• W4367181766 created "2023-04-28" @default.
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• W4367181766 date "2023-08-01" @default.
• W4367181766 modified "2023-10-16" @default.
• W4367181766 title "Understanding drivers of mercury in lake trout (Salvelinus namaycush), a top-predator fish in southwest Alaska's parklands" @default.
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• W4367181766 doi "https://doi.org/10.1016/j.envpol.2023.121678" @default.
• W4367181766 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37119998" @default.
• W4367181766 hasPublicationYear "2023" @default.
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