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• W4366364582 abstract "Abstract Organisms at the base of stream food webs are typically poor in long‐chain polyunsaturated fatty acids (LC‐PUFA), especially in docosahexaenoic acid (DHA), whereas consumers at higher trophic levels are often rich in LC‐PUFA. For example, fish tissues, especially the brain, are DHA‐rich. This obvious mismatch between consumer LC‐PUFA and their basal dietary supply may result from selective retention and/or endogenous conversion of dietary precursors to LC‐PUFA. To determine which is more likely, we investigated compound‐specific carbon stable isotopes in PUFA ( δ 13 C PUFA ) of potential basal resources (stream epilithon, leaf litter) and consumers (invertebrates, European bullhead, and two salmonid species and their brain, eye, liver, and muscle tissues). We predicted that consumer‐PUFA, depleted in 13 C values relative to their dietary sources, would indicate internal de novo PUFA synthesis. Alternatively, higher consumer‐ δ 13 C PUFA values would imply selective retention of aquatic (epilithon and conditioned leaves) rather than terrestrial resources or internal production, irrespective of trophic levels. Invertebrate grazers and predators resembled δ 13 C values of essential fatty acids ( δ 13 C EFA ) of benthic algae, while shredder‐ δ 13 C EFA values reflected those of conditioned rather than fresh leaves. Lower eye‐ δ 13 C EFA values of salmonids than in livers indicated high retention of dietary PUFA sources (invertebrates and epilithon). Stable isotope values of eicosapentaenoic acid suggest that all consumers retained algal EPA, while insectivorous fish produced DHA in their liver. There is no further evidence from carbon stable isotopes for local PUFA conversion within neural tissues. Our study demonstrates that δ 13 C PUFA can be used to track sources of these highly functional molecules in aquatic consumers and highlights the importance of algal derived‐PUFA for these consumers in oligotrophic headwater streams." @default.
• W4366364582 created "2023-04-21" @default.
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• W4366364582 date "2023-04-19" @default.
• W4366364582 modified "2023-09-30" @default.
• W4366364582 title "Compound‐specific stable isotopes resolve sources and fate of polyunsaturated fatty acids in biota of headwater streams" @default.
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• W4366364582 doi "https://doi.org/10.1111/fwb.14088" @default.
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