Eggshell geochemistry reveals ancestral metabolic thermoregulation in Dinosauria

Robin R. Dawson*, Daniel J. Field, Pincelli M. Hull, Darla K. Zelenitsky, François Therrien, Hagit P. Affek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

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.

Original languageAmerican English
Article numbereaax9361
JournalScience advances
Volume6
Issue number7
DOIs
StatePublished - 2020

Bibliographical note

Funding Information:
We thank support by The John F. Enders Grant and Yale University (R.R.D.), The Isaac Newton Trust and U.K. Research and Innovation Future Leaders Fellowship (MR/S032177/1 to D.J.F.), The Sloan Research Fellowship (P.M.H.), the Natural Sciences and Engineering Research Council Discovery Grant (D.K.Z.), and Israel Science Foundation grant 171/16 (H.P.A.).

Publisher Copyright:
Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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