Seasonal variation in terrestrial resource subsidies influences trophic niche width and overlap in two aquatic snake species: a stable isotope approach

By John Willson, C. T. Winne, Melissa A. Pilgrim, C. Romanek, J. Gibbons. 2010

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Applying stable isotopes to examine food‐web structure: an overview of analytical tools (2012, background): “Approaches include range or variance in δ13C and δ15N (Bearhop et al., 2004; McClellan et al., 2010; Willson et al., 2010), convex hulls calculated at the individual level (Layman et al.”
Best practices for use of stable isotope mixing models in food-web studies (2014, background): “Identification of food sources may be achieved by traditional means such as direct observation, stomach content analysis, fecal pellet analysis, or via the literature, although we advise caution with the latter approach as recent stable isotope studies suggest that there is considerable inter- and i”