Figure 5.

Correlation among critical photoperiod (CPP) and the amplitude and period of the rhythmic response to the Nanda-Hamner protocol in the up- and down-selected lines within the Pine Barrens population. (a) Importantly, antagonistic selection rapidly reverses the sign of the previously determined (Bradshaw et al., 2003) genetic correlation between critical photoperiod (a measure of the seasonal photoperiodic timer) and amplitude of the rhythmic response to the Nanda-Hamner protocol (a measure of the daily circadian clock). At the same time, antagonistic selection does not generate a correlated response in period of the rhythmic response with either its amplitude (b) or with critical photoperiod (c). Details of ANOVAs are provided in Supplementary Table S8, and regressions in Supplementary Table S9. Symbols distinguish among ○ East, • West and ◊ North lines.