Fig. 1.
Predictions of how reduced physiological plasticity can be detected: (A) We predict that laboratory zebrafish (blue) will show higher performance in the measured traits at the optimal temperature (Topt) but have a narrower thermal performance breadth (≥80% performance) than wild zebrafish (light green). (B) We predict that wild zebrafish will show a higher capacity for adjusting their biochemistry and physiology (through acclimation or physiological plasticity) to counteract direct thermal effects on biological rates. This will be evident in wild zebrafish maintaining close to normal biological rates (i.e., metabolism) across different temperatures, post acclimation, while laboratory zebrafish will display more extreme rates as temperatures increase or decrease. (C) To allow a consistent performance after acclimation, we predict greater regulation in the underlying mechanisms in the wild zebrafish compared to the laboratory zebrafish.