Resolving the bulk δ15N values of ancient human and animal bone collagen via compound-specific nitrogen isotope analysis of constituent amino acids

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Trophic position estimates of marine teleosts using amino acid compound specific isotopic analysis (2015, unknown): “In contrast, considerable 15 N depletion ( > 6 & ) has been measured with each trophic transfer of Thr (Hare et al. 1991; Styring et al. 2010).”
15N/14N ratios of amino acids as a tool for studying terrestrial food webs: a case study of terrestrial insects (bees, wasps, and hornets) (2011, background): “Recent evidence suggests that CSIA of amino acids is also useful in the evaluation of terrestrial food webs (Chikaraishi et al. 2010a; Naito et al. 2010; Styring et al. 2010 ).”
Nitrogen isotope fractionation in amino acids from harbor seals: implications for compound-specific trophic position calculations (2013, background): “However, several recent studies on higher TP animals have also reported Pro to be the most 15N-enriched AA (e.g. penguins and ancient humans; Lorrain et al. 2009, Styring et al. 2010), and it has been proposed that Pro might potentially replace Glu in TP calculations (Chikaraishi et al. 2009).”
New insight from old bones: stable isotope analysis of fossil mammals (2012, background): “…(d34S) all have been measured from fossil collagen, as well as carbon and nitrogen isotopic compositions from individual amino acids within the collagen matrix (Fogel and Tuross 2003; Styring et al. 2010), making it a suitable substrate for multiple lines of ecological and physiological inquiry.”