Figure 1.

The effects of elevated seawater pCO₂ and temperature on coelomic fluid (a) pH (pH_cf) and (b) Log₁₀ TCO₂ (TCO_2cf) of the sea urchin Paracentrotus lividus. Temperature treatments are indicated by blue, orange, and red colors for 10, 15, and 20°C, respectively. Ambient seawater pCO₂ (≈300 µatm) and elevated seawater pCO₂ (≈1,000 µatm) are indicated by plain and hatched box plot, respectively. Lower case letters identify significant differences (p < 0.05) between treatments. Capital letters identify significant differences (p < 0.05) between temperature treatments. Asterisks identify significant differences (p < 0.05) between pCO₂ treatments at the same temperature treatment