The evolution of critical thermal limits of life on Earth

Joanne M. Bennett*, Jennifer Sunday, Piero Calosi, Fabricio Villalobos, Brezo Martinez, Rafael Molina-Venegas, Miguel B. Araujo, Adam C. Algar, Susana Clusella-Trullas, Bradford A. Hawkins, Sally A. Keith, Ingolf Kuehn, Carsten Rahbek, Laura Rodriguez, Alexander Singer, Ignacio Morales-Castilla, Miguel Angel Olalla-Tarraga

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Understanding how species' thermal limits have evolved across the tree of life is central to predicting species' responses to climate change. Here, using experimentally-derived estimates of thermal tolerance limits for over 2000 terrestrial and aquatic species, we show that most of the variation in thermal tolerance can be attributed to a combination of adaptation to current climatic extremes, and the existence of evolutionary 'attractors' that reflect either boundaries or optima in thermal tolerance limits. Our results also reveal deep-time climate legacies in ectotherms, whereby orders that originated in cold paleoclimates have presently lower cold tolerance limits than those with warm thermal ancestry. Conversely, heat tolerance appears unrelated to climate ancestry. Cold tolerance has evolved more quickly than heat tolerance in endotherms and ectotherms. If the past tempo of evolution for upper thermal limits continues, adaptive responses in thermal limits will have limited potential to rescue the large majority of species given the unprecedented rate of contemporary climate change. Historical climate adaptation can give insight into the potential for adaptation to contemporary changing climates. Here Bennett et al. investigate thermal tolerance evolution across much of the tree of life and find different effects of ancestral climate on the subsequent evolution of ectotherms vs. endotherms.

Original languageEnglish
Article number1198
JournalNature Communications
Volume12
Issue number1
Number of pages9
ISSN2041-1723
DOIs
Publication statusPublished - 2021

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