Figure 1. Schematic of experimental design, showing P.
aegeria development through four larval instars to pupation. Larvae
were divided between six treatments, consisting of exposure to short-day
or long-day photoperiodic regimes at different points during larval
development. Larvae were either exposed to constant daylengths (long
control; short control), switched between daylength regimes (long to
short; short to long) on the first day of the fourth larval instar, or
switched between daylength regimes on the first day of the third larval
instar.