Response to selection for increased desiccation resistance to 35% RH in (a) D. birchii and (b) D. bunnanda for three replicate control (C1–3, open bars) and selected (S1–3, filled bars) lines. Error bars reflect standard errors. Response to selection was significant in D. birchii (F1,4 = 31.478, p < 0.001) and D. bunnanda (F1,4 = 12.775, p < 0.001) (electronic supplementary material, table S3).