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Calcification of S. caliendrum recruits in experiment II under natural-phase diurnal (grey bars) and reverse-phase diurnal pCO2 (white bars) treatments using weight (left ordinate) and area (right ordinate) scales. Significant paired t-tests between pCO2 treatments (p < 0.05) denoted by an asterisk. Mean ± s.e.m. displayed (weight: n = 32–36, area: n = 11–12).
