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Figure 10 | Progress in Earth and Planetary Science

Figure 10

From: Biochemical and physiological bases for the use of carbon and nitrogen isotopes in environmental and ecological studies

Figure 10

A schematic diagram showing the relationship between trophic level and δ 15 N values of amino acids. Relationships between trophic positions and nitrogen isotopic compositions of phenylalanine and glutamate in (a) aquatic and (b) terrestrial C3 and C4 plants. Vertical axis indicates the relative δ 15N values of the amino acids. The mathematical formula for these relationships are given in the text as equation 17.

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