For the 2015 measurements (third growing season), repeated measures ANOVA showed that the temperature response curve of Vcmax and Jmax (for temperatures between 10 and 30 °C) was not different between the southern (Watford) and northern (Deville) plantation sites (Table 5). The Jmax25:Vcmax25 ratio averaged 2.5 ± 0.2 and was also not different between the two plantation sites and not different between the two seed sources. For the measurements conducted only in the Watford plantation site in 2016 (fourth growing season), the temperature response curve of Vcmax, Jmax and gm displayed marked increases with temperature, followed by decreases above Topt (Fig. 6). The optimal temperature (Topt) for Vcmax and Jmax was higher for the southern seed source than for the northern one (Table 6). Topt for gm was similar for the two seed sources and averaged 28 ± 1.1 °C. The activation energy (Ha) for Jmax was greater for the southern seed source than for northern one but this was not the case for Vcmax (Table 6). Also, the entropy term of Vcmax was greater for the northern seed source than for the southern one (Table 6).