Fig. 8. Correlation coefficients between the independent contrasts in body mass and enzyme activities of (A,B) hexokinase (HK), (C) citrate synthase (CS), (D) glycogen phosphorylase (GP) and (E) trehalase (TR). Solid lines represent analyses performed using the gradual model of character evolution while broken lines represent the speciational model. The relationship between independent contrasts obtained from cyt b phylogeny is only presented for HK (A). The cyt b independent contrasts relationships are superimposed on the distribution of correlation coefficient results from analyses performed with 10 000 different trees (see Materials and methods). The correlation coefficients obtained from cyt b sequence information are presented for HK (gradual: r=-0.77, P=0.003; speciational: r=-0.73, P=0.007), CS (gradual: r=0.75, P=0.008; speciational: r=0.76, P=0.007), GP (gradual: r=-0.69, P=0.013; speciational: r=-0.64, P=0.025) and TR (gradual: r=-0.58, P=0.047; speciational: r=-0.65, P=0.023). The shaded areas represent non-significant relationships, given that the critical values of the correlation coefficient r for significance at the P=0.05 level (two-tailed) is 0.576 for HK, GP and TR (d.f.=10) and 0.602 for CS (d.f.=9).