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Figure 1.2 Gas exchange patterns shown by Perisphaeria sp. (Blattaria, Blaberidae) at rest: (a) continuous gas exchange, (b) discontinuous gas exchange cycles, (c) interburst-burst, (d) pulsation. In each case, VCO2 is shown as the lower curve (left axis) and activity as the upper curve (right axis). Activity is interpreted as the variance of activity about the mean value, rather than the absolute value of this activity, and it is negligible.

Source: Marais and Chown (2003).

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