Are lizards feeling the heat? A tale of ecology and evolution under two temperatures

Shai Meiri*, Aaron M. Bauer, Laurent Chirio, Guarino R. Colli, Indraneil Das, Tiffany M. Doan, Anat Feldman, Fernando Castro Herrera, Maria Novosolov, Panayiotis Pafilis, Daniel Pincheira-Donoso, Gary Powney, Omar Torres-Carvajal, Peter Uetz, Raoul Van Damme

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

119 Scopus citations

Abstract

Aim: Temperature influences most components of animal ecology and life history - but what kind of temperature? Physiologists usually examine the influence of body temperatures, while biogeographers and macroecologists tend to focus on environmental temperatures. We aim to examine the relationship between these two measures, to determine the factors that affect lizard body temperatures and to test the effect of both temperature measures on lizard life history. Location: World-wide. Methods: We used a large (861 species) global dataset of lizard body temperatures, and the mean annual temperatures across their geographic ranges to examine the relationships between body and mean annual temperatures. We then examined factors influencing body temperatures, and tested for the influence of both on ecological and life-history traits while accounting for the influence of shared ancestry. Results: Body temperatures and mean annual temperatures are uncorrelated. However, accounting for activity time (nocturnal species have low body temperatures), use of space (fossorial and semi-aquatic species are 'colder'), insularity (mainland species are 'hotter') and phylogeny, the two temperatures are positively correlated. High body temperatures are only associated with larger hatchlings and increased rates of biomass production. Annual temperatures are positively correlated with clutch frequency and annual longevity, and negatively correlated with clutch size, age at first reproduction and longevity. Main conclusions: Lizards with low body temperatures do not seem to have 'slower' life-history attributes than species with high body temperatures. The longer seasons prevalent in warm regions, and physiological processes that operate while lizards are inactive (but warm enough), make environmental temperatures better predictors of lizard life-history variation than body temperatures. This surprisingly greater effect of environmental temperatures on lizard life histories hints that global warming may have a profound influence on lizard ecology and evolution.

Original languageEnglish
Pages (from-to)834-845
Number of pages12
JournalGlobal Ecology and Biogeography
Volume22
Issue number7
DOIs
StatePublished - Jul 2013

Funding

FundersFunder number
Leverhulme Trust
National Science FoundationDEB 0844523
Natural Environment Research Council

    Keywords

    • Body temperature
    • Diel cycle
    • Environmental temperature
    • Global warming
    • Life history
    • Lizards
    • Thermal biology

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