Fig. 4

Effects of warming tolerance selection on life history and physiological traits.

a, Number of eggs from spawning boxes (n = boxes: Down = 17, Control = 14, Up = 14) during the initial round of reproduction. b, Egg diameter of a subset of ten eggs from each box (n = eggs: Down = 223, Control = 263, Up = 287). c, Initial weight (n = individuals at 44–47 dpf: Down = 78, Control = 78, Up = 70). d, Final weight (n = individuals at 74–100 dpf: Down = 78, Control = 78, Up = 70). e, Specific growth rate (n = individuals: Down = 77, Control = 78, Up = 70). f, Maximum swim speed (n = individuals at 28 °C: Down = 27, Control = 28, Up = 25; and at 34 °C: Down = 22, Control = 27, Up = 25). g, Thermal preference (n = individuals: Down = 22, Control = 26, Up = 23). Data from the two measurement periods are pooled (d–g). h, Brain HSP70 level relative to the Control treatment at baseline (n = individuals at baseline: Down = 12, Control = 11, Up = 12; and after heat shock: Down = 10, Control = 13, Up = 12). Data are presented with mean (black points) ± s.e. (error bars).