Thermal tolerance patterns across latitude and elevation

Jennifer Sunday, Joanne M. Bennett, Piero Calosi, Susana Clusella-Trullas, Sarah Gravel, Anna L. Hargreaves, Félix P. Leiva, Wilco C.E.P. Verberk, Miguel Ángel Olalla-Tárraga, Ignacio Morales-Castilla

Research output: Contribution to journalArticlepeer-review

164 Citations (Scopus)


Linking variation in species' traits to large-scale environmental gradients can lend insight into the evolutionary processes that have shaped functional diversity and future responses to environmental change. Here, we ask how heat and cold tolerance vary as a function of latitude, elevation and climate extremes, using an extensive global dataset of ectotherm and endotherm thermal tolerance limits, while accounting for methodological variation in acclimation temperature, ramping rate and duration of exposure among studies. We show that previously reported relationships between thermal limits and latitude in ectotherms are robust to variation in methods. Heat tolerance of terrestrial ectotherms declined marginally towards higher latitudes and did not vary with elevation, whereas heat tolerance of freshwater and marine ectotherms declined more steeply with latitude. By contrast, cold tolerance limits declined steeply with latitude in marine, intertidal, freshwater and terrestrial ectotherms, and towards higher elevations on land. In all realms, both upper and lower thermal tolerance limits increased with extreme daily temperature, suggesting that different experienced climate extremes across realms explain the patterns, as predicted under the Climate Extremes Hypothesis. Statistically accounting for methodological variation in acclimation temperature, ramping rate and exposure duration improved model fits, and increased slopes with extreme ambient temperature. Our results suggest that fundamentally different patterns of thermal limits found among the earth's realms may be largely explained by differences in episodic thermal extremes among realms, updating global macrophysiological 'rules'. This article is part of the theme issue 'Physiological diversity, biodiversity patterns and global climate change: testing key hypotheses involving temperature and oxygen'.

Original languageEnglish
Article number20190036
Pages (from-to)1-10
Number of pages10
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Issue number1778
Publication statusPublished - 5 Aug 2019
Externally publishedYes


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