Ferox Trout (Salmo trutta) as ''Russian dolls'': complementary gut content and stable isotope analyses of the Loch Ness foodweb

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Variance in isotopic signatures as a descriptor of tissue turnover and degree of omnivory (2005, background): “Existing studies of equilibration have tended to focus on mean isotopic signatures; however, stable isotopes can also be applied to investigations of omnivory or specialization of feeding through analysis of isotopic variance among individuals (France 1997; Grey 2001; Grey et al. 2002; Bearhop et al”
Effect of nutrition on fatty acid profiles of riverine, lacustrine, and aquaculture-raised salmonids of pre-alpine habitats (2010, background): “Such concepts include, (a) gut content analysis of freshwater copepods (Fryer, 1957), amphipods (Quigley & Vanderploeg, 1991), and fish (Grey et al., 2002), (b) pigment analysis (Thys et al., 2003), and (c) stable isotope analysis (e.g., Cabana & Rasmussen, 1996; Post, 2002; Post et al., 2007).”