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δ15NGlx‐Phe values in five cetacean species plotted against their estimated trophic position from stomach contents (Pauly et al., 1998). The lack of relationship between δ15NGlx‐Phe and trophic position (predicted to be positively correlated) indicates δ15NGlx‐Phe is not a reliable proxy for relative trophic position in these species
