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Fig. 3

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Mean (‰ ± standard deviation) δ13C and δ15N of the digestive glands from surface (n = 40) and bottom (n = 40) cultured oysters (C. virginica), in addition to the δ13C and δ15N from different sources: POM (n = 12), sediment (n = 12), a macroalgae (Ulva sp.) (n = 1), and a marine plant (Zostera marina) (n = 1).

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