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Fig. 1. Gas exchange patterns shown by Perisphaeria sp. (Blattodea,
Blaberidae). (A) Gas exchange during activity, (B) Continuous gas exchange
pattern, (C) Discontinuous gas exchange cycle pattern, (D)
InterburstBurst pattern, (E) Pulsation pattern. In each case,
CO2 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. It is negligible except in
the case of A.