Stable isotopes of Carbon and Nitrogen are used as matter flow tracers between agricultural and pastoral spheres. ?15N and ?13C measurements are done on 1 / archaeobotanical remains: grains and grain threshing residues, plant residues that may have been usedas fodder and 2 / on phenylalanine (essential amino acid) and glutamine (non-essential amino acid) of collagen extracted from animal bones: domestic herbivores (sheep, goat, beef), wild herbivores, and some wild carnivores.
