Fig. 1. Illustration of the two parameters of phenotypic plasticity. Upper panel shows the change in phenotype over time following a change in the environment at Time = 1. The time it takes for the phenotype to become fully adjusted (in this case at Time = 2) is determined by therate of plasticity . For this example, the change in phenotype follows a linear trajectory, but other shapes of response are possible (addressed in the current study). Bottom panel shows the corresponding reaction norms for individuals reared in environment 1 acutely exposed to environment 2 (i.e. at Time = 1, prior to any adjustment by active plasticity), and for individuals where the active plastic response is completed (i.e. at Time = 2). The difference in slope of these two reaction norms represents the capacity for plasticity (Einum et al. 2019).