Figure 3.
Among-strain variation in fitness components (growth at different temperatures and freeze–thaw survival) is explained by differences among groups and by variation within groups. The following conditions were tested for 27 S. paradoxus strains: growth in liquid-rich medium at (a) 10°C, (b) 30°C, (c) 20°C, (d) 37°C and (e) survival to a freeze–thaw cycle. (a–e) T-test comparison between fitness of three genetic groups represented by boxplots (A, green; B, red; C, blue); (c–e) dots indicate the measurements of fitness components; curves indicate fitness component values expected under GLM models within each group separately (formula 3) as a function of climatic factors (c,d) Tm or (e) Do. Significance of the climatic estimate is shown next to the curve only for p ≤ 0.05. Within-group analyses are not shown for growth at 10°C and 30°C (where differences were not significant). p-value ranges are indicated by the following symbols: ***p < 0.001; **p < 0.01; *p < 0.05; °p < 0.1.