Scientists have discovered a single, fundamental pattern that governs how all life on Earth responds to temperature. In a major analysis of more than 30,000 measurements spanning roughly 2,700 species, researchers found that organisms ranging from microbes to mammals all follow the same underlying rule, known as the Universal Thermal Performance Curve (UTPC).
The pattern is strikingly simple. As temperature rises, biological performance accelerates: cells divide faster, animals move more quickly, and ecosystems become more productive. This increase continues up to an optimal temperature. Beyond that point, however, even a small further rise causes performance to collapse rapidly. Growth slows, physiological systems fail, and survival becomes difficult.
When properly scaled, thermal performance data from vastly different organisms — bacteria, plants, fish, birds, and mammals — all collapse onto this same characteristic rise-and-fall curve. While scientists have long observed individual thermal performance curves, this new work demonstrates that they are all variations of one shared universal template.
Evolution can shift a species’ optimal temperature and adjust its position along the curve, allowing adaptation to different climates. However, it appears unable to escape the curve’s fundamental shape. This constraint has important consequences for biodiversity under climate change. Many species, particularly those in stable tropical environments, already live close to their thermal limits. Even modest warming of a few degrees could push them beyond their peak, increasing extinction risk.
The discovery of the Universal Thermal Performance Curve provides a powerful new framework for predicting which species are most vulnerable to rising temperatures and for understanding the limits that physics and chemistry impose on life itself.
[Arnoldi, J.-F., Jackson, A. L., Peralta-Maraver, I., & Payne, N. L. (2025). A universal thermal performance curve arises in biology and ecology. Proceedings of the National Academy of Sciences, 122(43). DOI: 10.1073/pnas.2513099122]