Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades
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 ori...
| Main Authors: | , , , , , , , , , , , , |
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eLife Sciences Publications Ltd
2017-07-01
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| Series: | eLife |
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| Online Access: | https://elifesciences.org/articles/28589 |
| _version_ | 1811236897312210944 |
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| author | Kévin Rey Romain Amiot François Fourel Fernando Abdala Frédéric Fluteau Nour-Eddine Jalil Jun Liu Bruce S Rubidge Roger MH Smith J Sébastien Steyer Pia A Viglietti Xu Wang Christophe Lécuyer |
| author_facet | Kévin Rey Romain Amiot François Fourel Fernando Abdala Frédéric Fluteau Nour-Eddine Jalil Jun Liu Bruce S Rubidge Roger MH Smith J Sébastien Steyer Pia A Viglietti Xu Wang Christophe Lécuyer |
| author_sort | Kévin Rey |
| collection | DOAJ |
| description | 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 (δ18Op) of some of their Permo-Triassic therapsid relatives. Comparing of the δ18Op 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. |
| first_indexed | 2024-04-12T12:17:09Z |
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| id | doaj.art-bc27adf036bd4b0c8f07fc5861ebef91 |
| institution | Directory Open Access Journal |
| issn | 2050-084X |
| language | English |
| last_indexed | 2024-04-12T12:17:09Z |
| publishDate | 2017-07-01 |
| publisher | eLife Sciences Publications Ltd |
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| spelling | doaj.art-bc27adf036bd4b0c8f07fc5861ebef912022-12-22T03:33:25ZengeLife Sciences Publications LtdeLife2050-084X2017-07-01610.7554/eLife.28589Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid cladesKévin Rey0https://orcid.org/0000-0002-6788-2453Romain Amiot1François Fourel2Fernando Abdala3Frédéric Fluteau4Nour-Eddine Jalil5Jun Liu6Bruce S Rubidge7Roger MH Smith8J Sébastien Steyer9Pia A Viglietti10Xu Wang11Christophe Lécuyer12Univ Lyon, Université Lyon 1, Ens de Lyon, CNRS, UMR 5276 LGL-TPE, Villeurbanne, France, France; Evolutionary Studies Institute and School of Geosciences, University of the Witwatersrand, Johannesburg, South AfricaUniv Lyon, Université Lyon 1, Ens de Lyon, CNRS, UMR 5276 LGL-TPE, Villeurbanne, France, FranceUniv Lyon, Université Lyon 1, Ens de Lyon, CNRS, UMR 5276 LGL-TPE, Villeurbanne, France, France; Univ Lyon, Université Lyon 1, CNRS, UMR 5023 LEHNA, Villeurbanne, France, FranceEvolutionary Studies Institute and School of Geosciences, University of the Witwatersrand, Johannesburg, South AfricaInstitut de Physique du Globe de Paris, Paris, FranceCentre de Recherches en Paléobiodiversité et Paléoenvironnements, UMR 7207 CNRS-MNHN-UPMC, Museum National d’Histoire Naturelle, Paris, FranceKey Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, ChinaEvolutionary Studies Institute and School of Geosciences, University of the Witwatersrand, Johannesburg, South AfricaEvolutionary Studies Institute and School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa; Iziko South African Museum, Cape Town, South AfricaCentre de Recherches en Paléobiodiversité et Paléoenvironnements, UMR 7207 CNRS-MNHN-UPMC, Museum National d’Histoire Naturelle, Paris, FranceEvolutionary Studies Institute and School of Geosciences, University of the Witwatersrand, Johannesburg, South AfricaKey Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, ChinaUniv Lyon, Université Lyon 1, Ens de Lyon, CNRS, UMR 5276 LGL-TPE, Villeurbanne, France, France; Institut Universitaire de France, Paris, FranceThe 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 (δ18Op) of some of their Permo-Triassic therapsid relatives. Comparing of the δ18Op 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.https://elifesciences.org/articles/28589therapsidsendothermystable isotopespermo-triassic |
| spellingShingle | Kévin Rey Romain Amiot François Fourel Fernando Abdala Frédéric Fluteau Nour-Eddine Jalil Jun Liu Bruce S Rubidge Roger MH Smith J Sébastien Steyer Pia A Viglietti Xu Wang Christophe Lécuyer Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades eLife therapsids endothermy stable isotopes permo-triassic |
| title | Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades |
| title_full | Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades |
| title_fullStr | Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades |
| title_full_unstemmed | Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades |
| title_short | Oxygen isotopes suggest elevated thermometabolism within multiple Permo-Triassic therapsid clades |
| title_sort | oxygen isotopes suggest elevated thermometabolism within multiple permo triassic therapsid clades |
| topic | therapsids endothermy stable isotopes permo-triassic |
| url | https://elifesciences.org/articles/28589 |
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