Scientists expected ectotherms to adjust physiology to daily temperature changes, stabilizing functions like metabolism and movement.

Researchers analyzed 26 studies covering metabolic, locomotor, cardiovascular, and enzyme activity in diverse ectotherms.

The study found no clear evidence that ectotherms reduce sensitivity to daily temperature variation.

Reptiles and fish showed higher sensitivity, suggesting greater risk as temperature variability increases and reliance shifts to behavior or long-term adaptation.