Fig. 3. Variation in (A) the relative growth rate (RGR) and (B) the estimated intrinsic rate of population increase (R_m) of aphids developing from offspring raised on `young' and `old' diets (circles) and for `pre-tuber-filling' and `tuber-filling' plants (squares). Values are either the mean RGR ± S.E.M. (N=8-15) or the mean R_m ± S.E.M. (N=7-14) for clones of Myzus persicae (open symbols) or Macrosiphum euphorbiae (closed symbols). Points falling below the line of equivalence indicate clones that perform better on the `young' diet. <sup>*</sup>Clones showing a significant difference, in post-hoc analysis, between `young' and `old' diets. ANOVA for RGR: diet: F_1,129=13.57, P<0.001; species: F_1,129=10.72, P<0.05; interaction: F_1,129=0.37, P>0.05; clone (subspecies): F_4,129=5.60, P<0.001. ANOVA for R_m: diet: F_1,120=31.95, P<0.001; species: F_1,120=37.87, P<0.001; interaction: F_1,120=1.43, P>0.05; clone (subspecies): F_4,120=4.75, P<0.01.

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