Figure 3.

Life span in three‐spined sticklebacks in relation to age‐related changes (square root transformed) of swimming endurance (a and c) and blue eye coloration (b and d). Zero change is indicated by the vertical double‐dashed line. Individual data points and within‐treatment regression lines are plotted from the Winter (a and b) and Spring (c and d) experiments, categorized by dietary treatment (restricted: black circle and dashed line; control: open circle and thin solid line). Larger square symbols and thicker solid lines denote treatment mean values and between‐treatment regression lines (see van de Pol & Wright 2009 for statistical explanation and Table 3 for full statistical analysis).