Fig. 2. The density of Buchnera and secondary symbionts in symbiotic aphids. Data were tested for significance by ANOVA (on logarithmic-transformed data): plant species, F_2,78=51.52, P<0.001; tissue (total tissues versus embryos), F_1,78=238.67, P<0.001; bacterial type (Buchnera versus secondary symbionts) F_1,78=1298.5, P<0.001; plant species x tissue, F_2,78=1.29, P>0.05; plant species x bacterial type, F_2,78=23.62, P<0.001; bacterial type x tissue, F_1,78=29.40, P<0.001; plant species x bacterial type x tissue, F_2,78=2.95, P>0.05. Density is expressed per unit protein; the total aphid tissues comprised 43µgproteinmg^-1freshmass (without significant variation among rearing plant species, P>0.05). Values are means ± S.E.M.

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