Figure 2
(a) Activity over a stepped profile of increasing Ta (n = 242 observations), using activity recorded in the first 3 min of stable Ta per stage (activitystage), for all birds tested (unless trial terminated within < 3 min of Ta stage start n = 12). Regression lines display significant relationship from LMM above the inflection point (Ta = 39.6 ± 0.5 °C), split by prenatal playback: birds had been prenatally exposed to either heat-calls (red triangles) or control calls (blue dots). (b) Activity in the 10 min prior and during measurement (activitymeas), for calm birds from which we obtained thermoregulatory values, at Ta = 27, 35 °C (n = 67) and at the max Ta reached (n = 32). Markers and error bars show mean ± SE.
