The chemistry of dinosaur eggshells suggests they were likely warm-blooded
In short: For decades, paleontologists have debated whether dinosaurs were cold-blooded like lizards or warm-blooded like birds. Recent analysis of fossilized eggshells offers a surprising answer. By examining the microscopic arrangement of atoms, researchers have discovered that these prehistoric creatures likely maintained body temperatures higher than their surrounding environments.
The debate over dinosaur metabolism has long centered on whether they were ectothermic (cold-blooded) or endothermic (warm-blooded). Research headed by University of Massachusetts-Amherst postdoctoral associate Robin Dawson indicates that dinosaurs represent an evolutionary bridge connecting reptiles and birds. Using a specialized technique called clumped isotope paleothermometry, researchers analyzed the chemical composition of fossilized eggshells to reconstruct ancient body temperatures.
This method relies on the principle that the specific ordering of oxygen and carbon atoms within a fossilized eggshell is determined by temperature. By calculating this atomic arrangement, scientists can estimate the internal body temperature of the mother dinosaur. The findings indicate that all major dinosaur groups tested had warmer body temperatures than their external environments, a hallmark of warm-bloodedness.
The data from the study, published in Science Advances, reveals significant thermal consistency across different species. For instance, eggshells from the small, meat-eating theropod Troodon, found in Alberta, Canada, yielded temperatures of 27, 28, and 38 degrees Celsius. Similarly, eggshells from the large, duck-billed Maiasaura in Alberta showed a temperature of 44 degrees Celsius. Even more distant from birds, the oospecies Megaloolithus from Romania tested at 36 degrees Celsius.
While these results provide compelling evidence for higher metabolic rates, the study highlights how unusual places, such as eggshells, can yield answers to fundamental biological questions. By looking at the biomineralized calcite crystals within these fossils, scientists are bridging the gap between reptilian and avian biology.
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Sources
- Summary by Intellect · source: Dinosaurs Probably Weren't Cold-Blooded, According to Eggshells
- Also: Were dinosaurs warm blooded? Their eggshells say yes
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