Unlocking the power of fatty acids as dietary tracers and metabolic signals in fishes and aquatic invertebrates.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Timothy D JardineMartin J Kainz

Abstract

Determining the transfer and transformation of organic matter in food webs is a fundamental challenge that has implications for sustainable management of ecosystems. Fatty acids (FA) offer a potential approach for resolving complex diet mixtures of organisms because they provide a suite of molecular tracers. Yet, uncertainties in the degree of their biochemical modification by consumers, due to selective retention or metabolism, have limited their application. Here, we consolidated 316 controlled feeding studies of aquatic ectotherms (fishes and invertebrates) involving 1404 species-diet combinations to assess the degree of trophic modification of FA in muscle tissue. We found a high degree of variability within and among taxa in the %FA in consumer muscle tissue versus %FA in diet regression equations. Most saturated FA had weak relationships with the diet (r2 < 0.30) and shallow slopes (m < 0.30), suggesting a lack of retention in muscle when fed in increasing amounts. Contrarily, several essential FA, including linoleic (18:2n-6) and α-linolenic acid (18:3n-3), exhibited significant relationships with the diet (m > 0.35, r2 > 0.50), suggesting supply limitations and selective retention in muscle by consumers. For all FA, rel...Continue Reading

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Sep 27, 2019·Nature·Christina C HicksM Aaron MacNeil
Jun 17, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Aaron W E Galloway, Suzanne M Budge
Jun 17, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Cornelia W TwiningMartin J Kainz

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Citations

Jun 17, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Michael D ThomasAaron W E Galloway
Jun 17, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Suzanne M BudgeJeffrey F Bromaghin
Jun 17, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Aaron W E Galloway, Suzanne M Budge
Apr 27, 2021·Oecologia·Kristin ScharnweberPeter Eklöv

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