Figure 4. Growth trajectories from the start of the third instar to pupation, showing mean age and weight at each molt (sexes pooled). Bars show 95% confidence intervals on both axes. Top row: results for larvae switched between daylength regimes in the fourth instar; bottom row: results for larvae switched in the third instar (the same per-population values for the control/constant daylength treatments are displayed for reference in both rows). In c and d, the fourth-instar trajectory for the long-to-short treatment is split by diapause decision, with individuals that entered diapause shown as open downward triangles and marked “diap.”. The Skåne population is not shown, as the lack of precise hatching dates meant that age could not be calculated.