Fig. 3. Aerobic catabolism as a function of temperature at ant height in a foraging trail of the same Messor pergandei colony as in Fig. 1. Symbols as in Fig. 1. Trail catabolism measurements were not available early on the second control day (filled squares, 2 July 1992). Testing the null hypothesis by ANCOVA (slopes equal) yielded P>0.15. The common slope is 0.295. Testing the null hypothesis (intercepts equal) yielded P>0.2. The common intercept is –3.14. The common slope corresponds to a Q₁₀ of 10^(10x0.295) or 1.97.