Fig. 2: The influence of oxygen availability (PO2, kPa) on oxygen supply (S) at a single temperature.
From: Oxygen availability and body mass modulate ectotherm responses to ocean warming
A When oxygen availability is high, supply (S) is not constrained, and potential to consume excess oxygen is maximized (yellow area). As environmental oxygen decreases below PO2crit max, oxygen supply is limited at a rate equal to the oxygen supply capacity (αS) and potential for excess oxygen consumption is constrained (orange area). When oxygen supply (S) equals demand (D) the critical oxygen partial pressure (PO2crit) is reached, below which there is a deficit of oxygen required to fuel basal demand (red area). B Shape of oxygen limitation relationships when αS is constant (linear thick black line) or variable (non-linear blue line) yet PO2crit and PO2crit max are identical.
