Fig. 1.

Linear regressions of critical thermal minimum (CT_min) across the five developmental temperatures. Each grey line represents one DGRP line (n = 166). The two full black lines represent the DGRP line with the steepest slope and the DGRP line with the flattest slope, with the difference in CT_min from developing at 17–29 °C indicated as ΔCT_min. The two dashed black lines represent the DGRP lines with the highest and lowest average CT_min across the temperatures indicated as ${\overline{\mathrm{CT}}}_{min}$. These latter two DGRP lines represent a genotype that performs poorly across environments and a genotype that performs well across environments