A global analysis of field body temperatures of active squamates in relation to climate and behaviour

Shahar Dubiner*, Rocío Aguilar, Rodolfo O. Anderson, Diego M. Arenas Moreno, Luciano J. Avila, Estefania Boada‐Viteri, Martin Castillo, David G. Chapple, Christian O. Chukwuka, Alison Cree, Fausto R. Méndez‐de‐la‐Cruz, Guarino R. Colli, Indraneil Das, Michel‐Jean Delaugerre, Wei‐Guo Du, Angel Dyugmedzhiev, Tiffany M. Doan, Paula Escudero, Jules Farquhar, Alison M. GainsburyBrian S. Gray, Annegret Grimm‐Seyfarth, Kelly M. Hare, Klaus Henle, Nora Ibargüengoytía, Yuval Itescu, Simon Jamison, Octavio Jimenez‐Robles, Antonieta Labra, Alejandro Laspiur, Tao Liang, Jackie L. Ludgate, Luca Luiselli, José Martín, Genevieve Matthews, Marlin Medina, Fausto R. Méndez‐de‐la‐Cruz, Donald B. Miles, Nathan E. Mills, Alejandro Bruno Miranda‐Calle, Joanne M. Monks, Mariana Morando, Débora L. Moreno Azocar, Gopal Murali, Panayotis Pafilis, Ana Pérez‐Cembranos, Valentín Pérez‐Mellado, Richard Peters, Ligia Pizzatto, Daniel Pincheira‐Donoso, Michael V. Plummer, Rachel Schwarz, Ben Shermeister, Richard Shine, Ole Theisinger, Wiebke Theisinger, Krystal A. Tolley, Omar Torres‐Carvajal, Soledad Valdecantos, Raoul Van Damme, Laurie J. Vitt, Erik Wapstra, Geoffrey M. While, Eran Levin, Shai Meiri

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

Aim
Squamate fitness is affected by body temperature, which in turn is influenced by environmental temperatures and, in many species, by exposure to solar radiation. The biophysical drivers of body temperature have been widely studied, but we lack an integrative synthesis of actual body temperatures experienced in the field, and their relationships to environmental temperatures, across phylogeny, behaviour and climate.

Location
Global (25 countries on six continents).

Taxa
Squamates (210 species, representing 25 families).

Methods
We measured the body temperatures of 20,231 individuals of squamates in the field while they were active. We examined how body temperatures vary with substrate and air temperatures across taxa, climates and behaviours (basking and diel activity).

Results
Heliothermic lizards had the highest body temperatures. Their body temperatures were the most weakly correlated with substrate and air temperatures. Body temperatures of non-heliothermic diurnal lizards were similar to heliotherms in relation to air temperature, but similar to nocturnal species in relation to substrate temperatures. The correlation of body temperature with air and substrate temperatures was stronger in diurnal snakes and non-heliothermic lizards than in heliotherms. Body-substrate and body-air temperature correlations varied with mean annual temperatures in all diurnal squamates, especially in heliotherms. Thermal relations vary with behaviour (heliothermy, nocturnality) in cold climates but converge towards the same relation in warm climates. Non-heliotherms and nocturnal species body temperatures are better explained by substrate temperature than by air temperature. Body temperature distributions become left-skewed in warmer-bodied species, especially in colder climates.

Main Conclusions
Squamate body temperatures, their frequency distributions and their relation to environmental temperature, are globally influenced by behavioural and climatic factors. For all temperatures and climates, heliothermic species' body temperatures are consistently higher and more stable than in other species, but in regions with warmer climate these differences become less pronounced. A comparable variation was found in non-heliotherms, but in not nocturnal species whose body temperatures were similar to air and substrate irrespective of the macroclimatic context.

Original languageEnglish
Article numbere13808
Number of pages18
JournalGlobal Ecology and Biogeography
Early online date29 Jan 2024
DOIs
Publication statusEarly online date - 29 Jan 2024

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