Figure 3
Constant temperature reaction norms and predictions across fluctuating temperature ranges for three average temperatures. Points in panels A-C show means for in measured response variables in each constant temperature after 66 hours. In each case, the best fitting model for the reaction norm was a Gompertz-Gaussian function (R2 > 0.99), using parameters in Table 1 and described in the text. Vertical lines on panels A-C are drawn at average temperatures used in variable temperature treatments (solid: 28°C average; dashed: 24°C average; dot-dash: 20°C average). Panels D-F show the predictions for the variable temperature experiments, assume a uniform distribution of temperatures within the diel variation range and integrating the reaction norms over the experimentally induced environmental variation (Equation 1). Vertical lines in panels D-F indicate approximate temperature range locations of the 6°C, 14°C, and 22°C variation treatments in the DTF experiments (l, m, and h in Figure 1). Error bars show +/- 1 standard error.