General linear model results for (a) the number of days aphids survived after the temperature manipulation (20°C control, 35°C and 39°C heat shocks) and for (b) the lifetime number of offspring they produced after these treatments.

The analyses were conducted once for all aphid sublines and once restricted to the Hamiltonella defensa-infected sublines, because only in the latter case can the subline x treatment interaction strictly be interpreted as a G x E interaction pertaining to different symbiont isolates.