Fig 3. Effects of the combination of CO₂ and temperature on spore germination success of Porolithon cf. onkodes.

CO₂ levels correspond to: control: 398–511 mg L^–1, medium: 550–738 mg L^–1 and high: 999–1568 mg L^–1; temperature levels to: ambient: 25–27°C and high: 27–29°C. Letters above bars indicate significant groupings by post-hoc Tukey test. Since irradiance did not have an effect on spore germination success we pooled the data across irradiance levels, therefore data are means of n = 6 (± SE).