Abstract
AbstractA fundamental question in dinosaur evolution is how they adapted to substantial long-term shifts in Earth System during the Mesozoic and when they developed environmentally independent, avian-style acclimatization due to the evolution of an endothermic physiology. Combining fossil occurrences with macroevolutionary and paleoclimatic models, we unveil distinct evolutionary pathways in the main dinosaur lineages: ornithischians and theropods diversified across broader climatic landscapes, trending toward cooler niches. An Early Jurassic shift to colder climates in Theropoda suggests an early adoption of endothermic thermophysiology. Conversely, sauropodomorphs exhibited prolonged climatic conservatism associated with higher thermal conditions. Paleo-biome mapping emphasizes temperature, rather than plant productivity, as the primary driver of this pattern, suggesting poikilothermic physiology with a stronger dependence on higher temperatures in sauropods since the Early Jurassic.One-Sentence SummaryDinosaur climatic evolution reveals early endothermy emergence in theropods, ornithischians but heterotherm sauropodomorphs.
Publisher
Cold Spring Harbor Laboratory
Reference117 articles.
1. Dinosaur Macroevolution and Macroecology;Annu. Rev. Ecol. Evol. Syst,2018
2. The Evolution of Dinosaurs
3. Sustained miniaturization and anatomical innovation in the dinosaurian ancestors of birds
4. Cope's rule and the adaptive landscape of dinosaur body size evolution
5. J. H. Ostrom , Osteology of Deinonychus antirrhopus, an Unusual Theropod from the Lower Cretaceous of Montana (Yale University Press, 1969; http://www.jstor.org/stable/j.ctvqc6gzx).