🌅 The Temperature Curve That Governs All Life

SOURCE

Arnoldi et al. (2025)

WHAT TO KNOW

• Researchers at Trinity College Dublin in Ireland analyzed the lifecycles of thousands of living organisms, from bacteria to reptiles, to understand how temperature affects life on Earth, uncovering a “universal thermal performance curve” that governs how all living things respond to temperature and suggests there’s a hard limit to how much heat an organism can handle. While the peak is different for different species (ranging from 5°C to 100°C), the authors describe the curve as a “shackle” evolution hasn’t managed to crack, as no studied species has been able to escape the limit placed on it by this apparent biological “rule.”

WHY IT MATTERS

• Scientists have long known that as temperatures rise, biological performance tends to gradually improve until it reaches an optimal peak, at which point performance is greatest. However, as temperatures rise beyond that point, performance rapidly declines, potentially leading to death. Earlier studies have used species’ thermal performance curves to show how quickly animals move, plants develop, or microbes divide as temperatures rise. The present study mapped tens of thousands of these curves together to uncover a single universal curve that appears to apply to all life on Earth.

CONNECT THE DOTS

• A new study by researchers at the University of Würzburg in Germany found half of all insects in the Amazon could face critical heat stress if global temperatures continue to rise unabated. Since insects make up around 70% of all known animal species and serve vital ecological functions as pollinators, decomposers, and predators, the researchers say their loss would ripple through ecosystems.