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. 2017 Jul 12;13(7):20170135. doi: 10.1098/rsbl.2017.0135

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© 2017 The Author(s)

Published by the Royal Society. All rights reserved.

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Figure 1. — Change in the critical thermal maximum (CT_max) (blue circles) with declining water oxygen tension (P_wO₂) (one-way ANOVA, p < 0.05), and the oxygen limit for thermal tolerance () (stars) in (a) C. atripectoralis (N = 5), (b) C. quinquelineatus (N = 5) and (c) A. polyacanthus (N = 5). For (a) C. atripectoralis (N = 8), the critical oxygen tension (P_crit) (grey triangles) increased with temperature, and the aerobic scope (AS) was maintained at normoxia (i.e. 0% reduction), reduced by 34% at 75 mmHg, and by 100% at the anaerobic transition line (grey dashed line) (see test and electronic supplementary material, table S1 for details). In (a) C. atripectoralis, the CT_max that was measured above the anaerobic transition line was not significantly different from the CT_max measured at normoxia, but decreased significantly with P_wO₂ when measured below the anaerobic transition line (one-way ANOVA, p < 0.05). In (a) C. atripectoralis (N = 5), the hypoxia sensitivity of CT_max was not affected by 14 days acclimation to elevated CO₂ (red squares) (two-way ANOVA, p < 0.05). Values are means ± 1 s.e.m. Illustrations by Erin Walsh.

Inline graphic — Change in the critical thermal maximum (CT_max) (blue circles) with declining water oxygen tension (P_wO₂) (one-way ANOVA, p < 0.05), and the oxygen limit for thermal tolerance () (stars) in (a) C. atripectoralis (N = 5), (b) C. quinquelineatus (N = 5) and (c) A. polyacanthus (N = 5). For (a) C. atripectoralis (N = 8), the critical oxygen tension (P_crit) (grey triangles) increased with temperature, and the aerobic scope (AS) was maintained at normoxia (i.e. 0% reduction), reduced by 34% at 75 mmHg, and by 100% at the anaerobic transition line (grey dashed line) (see test and electronic supplementary material, table S1 for details). In (a) C. atripectoralis, the CT_max that was measured above the anaerobic transition line was not significantly different from the CT_max measured at normoxia, but decreased significantly with P_wO₂ when measured below the anaerobic transition line (one-way ANOVA, p < 0.05). In (a) C. atripectoralis (N = 5), the hypoxia sensitivity of CT_max was not affected by 14 days acclimation to elevated CO₂ (red squares) (two-way ANOVA, p < 0.05). Values are means ± 1 s.e.m. Illustrations by Erin Walsh.