Figure 3.

Results of choice experiment quantifying predation by Atlantic oyster drills offered a side-by-side choice of oysters cultured under both ambient (500 µatm) and high (1000 µatm) pCO₂ levels. The experiment was conducted with drills held under both ambient and elevated pCO₂ levels (n = 9 jars per pCO₂ level). Bars are the mean number (+s.e.) of oysters drilled during the 48 h experiment: control oysters (black bars), high-pCO₂ oysters (grey bars) and total (cross-hatched bars). Overall, drills consumed 48% more high-pCO₂ oysters than control oysters.