Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades

Kevin Rey; Romain Amiot; François Fourel; Fernando Abdala; Frédéric Fluteau; Nour-Eddine Jalil; Jun Liu; Bruce Rubidge; Roger Mh Smith; J Sébastien Steyer; Pia Viglietti; Xu Wang; Christophe Lécuyer

Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades

Kevin Rey ^{1, 2} Romain Amiot ¹ François Fourel ^{1, 3} Fernando Abdala ² Frédéric Fluteau ⁴ Nour-Eddine Jalil ⁵ Jun Liu ⁶ Bruce Rubidge ² Roger Mh Smith ^{2, 7} J Sébastien Steyer ⁵ Pia Viglietti ² Xu Wang ⁸ Christophe Lécuyer ^{1, 9}

1 LGL-TPE - Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement [Lyon]

2 Evolutionary Studies Institute and School of Geosciences,

3 LEHNA - Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés

4 IPGP - Institut de Physique du Globe de Paris

5 CR2P - Centre de recherche sur la Paléobiodiversité et les Paléoenvironnements

6 Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences

7 Iziko South African Museum, Cape Town

8 Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China

9 IUF - Institut Universitaire de France

Abstract : The only true living endothermic vertebrates are birds and mammals, which produce and regulate their internal temperature quite independently from their surroundings. For mammal ancestors, anatomical clues suggest that endothermy originated during the Permian or Triassic. Here we investigate the origin of mammalian thermoregulation by analysing apatite stable oxygen isotope compositions (d18Op) of some of their Permo-Triassic therapsid relatives. Comparing of the d18Op values of therapsid bone and tooth apatites to those of co-existing non-therapsid tetrapods, demonstrates different body temperatures and thermoregulatory strategies. It is proposed that cynodonts and dicynodonts independently acquired constant elevated thermometabolism, respectively within the Eucynodontia and Lystrosauridae + Kannemeyeriiformes clades. We conclude that mammalian endothermy originated in the Epicynodontia during the middle-late Permian. Major global climatic and environmental fluctuations were the most likely selective pressures on the success of such elevated thermometabolism.

Document type :

Journal articles

Domain :

Environmental Sciences / Biodiversity and Ecology

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https://hal-sde.archives-ouvertes.fr/hal-01692941
Contributor : Nathalie Lyvet <>
Submitted on : Thursday, January 25, 2018 - 3:53:04 PM
Last modification on : Wednesday, May 15, 2019 - 3:53:04 AM

Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades

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Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades

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