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Enrichments in 13C and 15N in macrofauna after 1 and 58 days (39°N; a, b) or after 2 and 51 days (1°N: c, d) following phytoplankton additions. Limited numbers of macrofauna were significantly enriched in 13C or 15N by labeled cyanobacteria (orange) or labeled diatoms (blue), which has the ∆δ13C and ∆δ15N values greater than the average +2σ (SD) of natural background samples
