Figure 7

Percent difference in H₂O₂. Bars show the percent difference between stress and healthy treatments in aqueous H₂O₂ (shown on a logarithmic y-axis) after two hours of incubation in each experimental condition (listed on x-axis) relative to standard conditions of 9 °C under 100 μmol m⁻² s⁻¹ light. Heat: 20 °C, 100 μmol m⁻² s⁻¹ light; Grazers: presence of snails (Littorina littorea), 100 μmol m⁻² s⁻¹ light; H light (high light): 9 °C; 130 μmol m⁻² s⁻¹ light, 14 °C: 14 °C, and 100 μmol m⁻² s⁻¹ light; and L light (low light): 9 °C, and 30 μmol m⁻² s⁻¹ light.