Figure 5. Abundance of P. quercifex in a common garden experiment.

Bars represent the mean (±SEM) P. quercifex 1^st instars per 10 leaves. We calculated mean abundance across 4 sample dates (May 10, 17, 26, and July 15, 2011) since Repeated Measures ANOVA indicated there was no interaction of time with ovisac source or temperature treatment. 1^st instars hatched from ovisacs collected on hot (red) and cold (blue) urban trees, then reared on ‘hot’ and ‘cold’ greenhouse saplings (x axis). There was a significant interaction between P. quercifex ovisac source temperature and greenhouse temperature (F _{1, 134} = 11.57, P = 0.0009, n = 40). Detailed statistics are available in Table 1.