Variance in isotopic signatures as a descriptor of tissue turnover and degree of omnivory

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Turnover and fractionation of carbon and nitrogen stable isotopes in tissues of a migratory coastal predator, summer flounder (Paralichthys dentatus) (2010, background): “Some studies demonstrated little or no difference in isotopic turnover rates among fish tissues (e.g., Hesslein et al. 1993; Sweeting et al. 2005; McIntyre and Flecker 2006), but limited sample sizes may have reduced the power to detect differences in some instances.”
Rates and components of carbon turnover in fish muscle: insights from bioenergetics models and a whole-lake 13C addition (2011, background): “We excluded one lambda value (0.0006) from Sweeting et al. (2005) as an outlier, given it was sevenfold smaller than the next smallest lambda value that we considered.”
Trophic relationships along a bathymetric gradient at the deep-sea observatory HAUSGARTEN (2009, background): “It shows that they had a broad trophic niche width (Bearhop et al., 2004), possibly due to opportunistic dietary habits (Sweeting et al., 2005), which may indicate food limitation.”
Ontogenetic and seasonal changes in the feeding habits and trophic levels of two small pelagic fish species (2012, background): “Muscle has been defined as the most appropriate tissue to analyse stable isotope in fish (Sweeting et al. 2005).”