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Amino acid nitrogen isotopic analysis is a relatively new method for estimating trophic position. It uses the isotopic difference between an individual’s ‘trophic’ and ‘source’ amino acids to determine its trophic position. So...

nitrogen isotopic analysis isotope metabolism trophic discrimination factor trophic enrichment factor food web

compound-specific nitrogen isotope analysis ecological niche trophic position trophic discrimination factor Proline Hydroxyproline