Cretaceous Dinosaur-Bearing Formations: Prediction and Implications for Fossil Bias Estimation

Chiarenza, Alfio Alessandro; Allison, Peter A.; Mannion, Philip D.; Lunt, D. J.; Markwick, Paul J.

doi:10.1130/abs/2016am-282955

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“…As is common in all climate models, sub-grid scale processes such as cloud, convection and oceanic eddies are parameterized as they cannot be (80). The implications of deep-time studies of these GCM constraints were discussed in previous studies (17,29,(81)(82)(83). In summary, the model simulations ran for at least 6000 (often many thousands of years more) model years until they reached full equilibrium in both the atmosphere and deep ocean.…”

Section: Paleoclimate Modelmentioning

confidence: 99%

Early Jurassic origin of avian endothermy and thermophysiological diversity in Dinosauria

Chiarenza,

Cantalapiedra,

Jones

et al. 2023

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A 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.

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