Figure 3

Initial offspring of aphids differing in symbiont status when exposed to alarm pheromone or hexane (experiment 2b). Number of offspring $\left(\overline{X}\pm \text{ SE}\right)$ on day one for aphids (aphid line is given below symbiont status) with either Hamiltonella defensa (5A), Regiella insecticola (5A, LSR1), Serratia symbiotica (5A) symbiotic infection or with no secondary symbiont (5A, LSR1), challenged with EBF or hexane. A similar, but less pronounced pattern was apparent in cumulative reproduction.