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Size (area + s.e.) of oysters drilled in the ambient (500 µatm, black bars) and high (1000 µatm, grey bars) pCO2 groups during the choice experiment. The experiment was conducted with drills held under both ambient and high-pCO2 levels (n = 9 jars per level). Drilled oysters from the high-pCO2 group were significantly smaller than control oysters (paired t-test, t16 = 7.39, p < 0.0001).
