Eggshell geochemistry reveals ancestral metabolic thermoregulation in Dinosauria

Dawson, Robin R. and Field, Daniel J. and Hull, Pincelli M. and Zelenitsky, Darla K. and Therrien, François and Affek, Hagit P. (2020) Eggshell geochemistry reveals ancestral metabolic thermoregulation in Dinosauria. Science Advances, 6 (7). eaax9361. ISSN 2375-2548 DOI https://doi.org/10.1126/sciadv.aax9361

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Abstract

Studying the origin of avian thermoregulation is complicated by a lack of reliable methods for measuring body temperatures in extinct dinosaurs. Evidence from bone histology and stableisotopes often relies on uncertain assumptions about the relationship between growth rate and body temperature, or the isotopic composition (δ18O) of body water. Clumped isotope (Δ47) paleothermometry, based on binding of 13C to 18O, provides a more robust tool, but has yet to be applied across a broad phylogenetic range of dinosaurs while accounting for paleoenvironmental conditions. Applying this method to well-preserved fossil eggshells demonstrates that the three major clades of dinosaurs, Ornithischia, Sauropodomorpha, and Theropoda, were characterized by warm body temperatures. Dwarf titanosaurs may have exhibited similar body temperatures to larger sauropods, although this conclusion isprovisional, given current uncertainties in taxonomic assignment of dwarf titanosaur eggshell. Our results nevertheless reveal that metabolically controlled thermoregulation was the ancestral condition for Dinosauria.

Item Type:	Article
Uncontrolled Keywords:	AREP2019; IA76
Subjects:	04 - Palaeobiology
Divisions:	04 - Palaeobiology 07 - Gold Open Access
Journal or Publication Title:	Science Advances
Volume:	6
Page Range:	eaax9361
Identification Number:	https://doi.org/10.1126/sciadv.aax9361
Depositing User:	Sarah Humbert
Date Deposited:	21 Feb 2020 12:41
Last Modified:	21 Feb 2020 12:41
URI:	http://eprints.esc.cam.ac.uk/id/eprint/4629

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