2020
DOI: 10.1002/lom3.10360
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The selection and analysis of fatty acid ratios: A new approach for the univariate and multivariate analysis of fatty acid trophic markers in marine pelagic organisms

Abstract: Fatty acid (FA) compositions provide insights about storage and feeding modes of marine organisms, characterizing trophic relationships in the marine food web. Such compositional data, which are normalized to sum to 1, have values-and thus derived statistics as well-that depend on the particular mix of components that constitute the composition. In FA studies, if the set of FAs under investigation is different in two separate studies, all the summary statistics and relationships between the FAs that are common… Show more

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Cited by 38 publications
(29 citation statements)
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“…The biosynthesis of specific long-chained fatty acids and wax esters is a special adaptation of Calanus spp. and some other zooplankters to cope with the strong seasonality in food availability (Sargent and Falk-Petersen, 1988;Hagen and Auel, 2001;Graeve and Greenacre, 2020). Capital breeders, such as C. hyperboreus and C. glacialis, contain enough lipids for gonad maturation and egg production, and can spawn without feeding (Falk-Petersen et al, 1990;Varpe et al, 2009;Schultz et al, 2020).…”
Section: Lipid Content and Match For Reproductionmentioning
confidence: 99%
“…The biosynthesis of specific long-chained fatty acids and wax esters is a special adaptation of Calanus spp. and some other zooplankters to cope with the strong seasonality in food availability (Sargent and Falk-Petersen, 1988;Hagen and Auel, 2001;Graeve and Greenacre, 2020). Capital breeders, such as C. hyperboreus and C. glacialis, contain enough lipids for gonad maturation and egg production, and can spawn without feeding (Falk-Petersen et al, 1990;Varpe et al, 2009;Schultz et al, 2020).…”
Section: Lipid Content and Match For Reproductionmentioning
confidence: 99%
“…In our study, the fatty acid profiles, which serve as "dietary markers" or "trophic biomarkers," indicated that juveniles may feed on phytoplankton (16: 1ω7 + C16 PUFA + 20: 5ω3; C18 PUFA + 22: 6ω3), zooplankton (copepods: 20: 1ω9 + 22: 1ω11), and detritus (18: 1ω9). Considering that in most crustaceans these PUFAs cannot be biosynthesized (due to the lack of desaturase activities; [ 106 ]), they are obtained directly from food and have been widely used as fatty acid trophic markers in marine environments [ 38 , 91 , 92 , 107 , 108 ].…”
Section: Discussionmentioning
confidence: 99%
“…Marine organisms with a wide biogeographic distribution that inhabit heterogeneous environments can show variations in the composition and profiles of fatty acids with latitude [ 35 , 36 ]. This variability in fatty acid profiles can result, for example, from variations in the essential fatty acids that are obtained through the organism’s diet and cannot be synthesized by the organism itself [ 31 , 37 , 38 ]. For instance, eicosapentaenoic (EPA, 20: 5ω3) and docosahexaenoic (DHA, 22: 6ω3) acids are highly unsaturated fatty acids, which are essential for organisms living at high latitudes (i.e., at low temperatures) because these fatty acids maintain fluidity and the optimal functioning of membranes [ 31 , 39 ].…”
Section: Introductionmentioning
confidence: 99%
“…In short, the goal is to measure the deviation of the ALRtransformed data from the ideal of isometry. This way of measuring the proximity between two configurations in multidimensional space by the Procrustes correlation has already been used to select a subset of pairwise logratios that engenders a Euclidean geometry close to the exact one (11)(12)(13). This idea was inspired by the selection of variables in PCA (26), and the same idea will be used here to select a reference in order to define a set of ALRs.…”
Section: Logratio Geometrymentioning
confidence: 99%
“…The proponents of these complex transformations take isometry as a type of "gold standard" for the analysis of compositional data, and the strict adherence to this mathematical ideal has been to the detriment of using simpler transformations such as the ALRs, or a subset of pairwise logratios. In a series of papers (11)(12)(13) it is shown in a variety of contexts that a set of simple pairwise logratios can satisfactorily approximate the logratio geometry, coming close to being isometric for all practical purposes. A small loss of isometry is thus traded off in favour of the benefit of a simpler and clearer interpretation of the logratio variables.…”
Section: Introductionmentioning
confidence: 99%