Effect of lipid removal on carbon and nitrogen stable isotope ratios in crustacean tissues

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Stable isotopes and trace elements as indicators of diet and habitat use in cetaceans: predicting errors related to preservation, lipid extraction, and lipid normalization (2010, background): “…questioned, and alternative models have been proposed in some cases (e.g. Satterfield & Finney 2002, Kiljunen et al. 2006, Sweeting et al. 2006, Bodin et al. 2007, Post et al. 2007, Smyntek et al. 2007, Mintenbeck et al. 2008, Logan et al. 2008), although none were developed in the perspective…”
How to account for the lipid effect on carbon stable‐isotope ratio (δ13C): sample treatment effects and model bias (2008, background): “Previous studies confirm the extraction-induced effect on d 15 N and reported increases of up to 1 Á 2% in crustacean hepatopancreas (Bodin et al., 2007) and up to 2 Á 8% in whole juvenile fishes (Sotiropoulos et al., 2004).”
Tissue, ontogenic and sex-related differences in δ13C and δ15N values of the oceanic squid Todarodes filippovae (Cephalopoda: Ommastrephidae) (2009, unknown): “In invertebrates, digestive gland and hepatopancreas contain large amounts of dietary lipids, and, because lipids are depleted in 13C when compared to proteins and carbohydrates, they induce lower 13C values in fatty compared to lean tissues (Lorrain et al. 2002; Bodin et al. 2007).”