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• W4284896069 abstract "Methylmercury (MeHg) is a global pollutant that can cause metabolic disruptions in animals and thereby potentially compromise the energetic capacity of birds for long-distance migration, but its effects on avian lipid metabolism pathways that support endurance flight and stopover refueling have never been studied. We tested the effects of short-term (14-d), environmentally relevant (0.5 ppm) dietary MeHg exposure on lipid metabolism markers in the pectoralis and livers of yellow-rumped warblers (Setophaga coronata) that were found in a previous study to have poorer flight endurance in a wind tunnel than untreated conspecifics. Compared to controls, MeHg-exposed birds displayed lower muscle aerobic and fatty acid oxidation capacity, but similar muscle glycolytic capacity, fatty acid transporter expression, and PPAR expression. Livers of exposed birds indicated elevated energy costs, lower fatty acid uptake capacity, and lower PPAR-γ expression. The lower muscle oxidative enzyme capacity of exposed birds likely contributed to their weaker endurance in the prior study, while the metabolic changes observed in the liver have potential to inhibit lipogenesis and stopover refueling. Our findings provide concerning evidence that fatty acid catabolism, synthesis, and storage pathways in birds can be dysregulated by only brief exposure to MeHg, with potentially significant consequences for migratory performance." @default.
• W4284896069 created "2022-07-09" @default.
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• W4284896069 date "2022-07-06" @default.
• W4284896069 modified "2023-10-17" @default.
• W4284896069 title "Short-term mercury exposure disrupts muscular and hepatic lipid metabolism in a migrant songbird" @default.
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• W4284896069 doi "https://doi.org/10.1038/s41598-022-15680-y" @default.
• W4284896069 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35794224" @default.
• W4284896069 hasPublicationYear "2022" @default.
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