Journal
SCIENCE
Volume 333, Issue 6041, Pages 443-445Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1206196
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Funding
- National Science Foundation [EAR-1024929, EAR-0949191]
- Deutsche Forschungsgemeinschaft (DFG) [TU 148/2-1, TU 148/4-1]
- Division of Physical Sciences at UCLA
- Division Of Earth Sciences
- Directorate For Geosciences [1024929] Funding Source: National Science Foundation
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The nature of the physiology and thermal regulation of the nonavian dinosaurs is the subject of debate. Previously, arguments have been made for both endothermic and ectothermic metabolisms on the basis of differing methodologies. We used clumped isotope thermometry to determine body temperatures from the fossilized teeth of large Jurassic sauropods. Our data indicate body temperatures of 36 degrees to 38 degrees C, which are similar to those of most modern mammals. This temperature range is 4 degrees to 7 degrees C lower than predicted by a model that showed scaling of dinosaur body temperature with mass, which could indicate that sauropods had mechanisms to prevent excessively high body temperatures being reached because of their gigantic size.
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