Figure 1.

Results of non-choice experiment quantifying predation by Atlantic oyster drills upon native oysters cultured under either ambient (500 µatm) or high (1000 µatm) pCO₂ levels. (a) Mean predation (+s.e.) during the 48 h experiment (n = 9 jars per pCO₂ level). (b) Mean shell size (area + s.e.) of all drilled oysters in replicate jars (n = 9 jars per pCO₂ level). Drills consumed 20.2% more oysters under high pCO₂ conditions, and these oysters were smaller in size (t-test, t₁₆ = 7.01, p < 0.0001).