Cryptic enrichment of nitrogen isotopes reveals metabolic differences in amino acids and alters trophic level interpretations

Noreen Tuross1, Linda Reynard1, Saskia Ryan2, Damia Ramis3 and Peter van Dommelen4, (1)Harvard University, Cambridge, MA, United States, (2)Harvard University, Cambridge, United States, (3)Independent Researcher, Palma de Mallorca, Spain, (4)Brown University, Providence, United States
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