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Time until immobilization (T imm). Time until immobilization (T imm) as a function of experimental temperature. Animals (triplicates per genotype) acclimated at 20 and 30°C for three generations were exposed to 37°C and time until locomotion was lost was recorded (minutes). The difference in T imm between experimental temperatures and between Hb‐rich and Hb‐poor genotypes was tested with a two‐way ANOVA (Appendix S6)
