AI Article Synopsis
- The study investigates whether dinosaurs were ectotherms (cold-blooded) or endotherms (warm-blooded) by analyzing growth rates from fossil bones.
- Researchers compiled growth data from both living and extinct vertebrates, including various dinosaur groups, and applied a metabolic scaling approach.
- Findings indicate that dinosaur metabolic rates were intermediate between endothermic and ectothermic classifications, suggesting a more complex metabolic classification than the traditional binary model.
Article Abstract
Were dinosaurs ectotherms or fast-metabolizing endotherms whose activities were unconstrained by temperature? To date, some of the strongest evidence for endothermy comes from the rapid growth rates derived from the analysis of fossil bones. However, these studies are constrained by a lack of comparative data and an appropriate energetic framework. Here we compile data on ontogenetic growth for extant and fossil vertebrates, including all major dinosaur clades. Using a metabolic scaling approach, we find that growth and metabolic rates follow theoretical predictions across clades, although some groups deviate. Moreover, when the effects of size and temperature are considered, dinosaur metabolic rates were intermediate to those of endotherms and ectotherms and closest to those of extant mesotherms. Our results suggest that the modern dichotomy of endothermic versus ectothermic is overly simplistic.
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| http://dx.doi.org/10.1126/science.1253143 | DOI Listing |
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