Figure 4
From: A qualitative assessment of limits of active flight in low density atmospheres
Active flight events as a function of oxygen partial pressure. The color of the bar in the background indicates the density of the gas mixture in the experimental bottle, the x-axis indicates oxygen availability for metabolism as partial pressure (bar). The crosses (X) show active flight events at a given oxygen partial pressure in experiments originally flushed with N2 (purple X) and He (blue X) during ambient atmosphere inflow. First active flight in the low density atmosphere (containing He) happens much later, at a significantly higher oxygen availability than in N2 experiment, decoupling the effect of the oxygen availability and atmospheric density on the initiation of active flight.
