Fig. 2. Rate of decline in oxygen concentration for P. carnea colonies before (squares) and after (circles) treatment with (A) 1 µmol l^-1 CCCP, (B) 1 µmol l^-1 antimycin A₁ and (C) 10 µmol l^-1 rotenone. For five colonies of each treatment, inset plots show the mean ± S.E.M. of the before/after difference in the rate of decline in oxygen concentration, where this decline is measured by the least-squared slope of oxygen concentration versus time. This difference in rate was significantly negative for (A), i.e. the oxygen uptake increased after treatment, and significantly positive for (B) and (C), i.e. the oxygen uptake decreased after treatment.

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