Climatic controls on the ecological ascendancy of dinosaurs

Emma Dunne*, Alex Farnsworth, Roger B J Benson, Pedro Godoy, Sarah Greene, Paul J. Valdes, Daniel J. Lunt, Richard Butler

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Downloads (Pure)

Abstract

The ascendancy of dinosaurs to become dominant components of terrestrial ecosystems was a pivotal event in the history of life, yet the drivers of their early evolution and biodiversity are poorly understood. During their early diversification in the Late Triassic, dinosaurs were initially rare and geographically restricted, only attaining wider distributions and greater abundance following the end-Triassic mass extinction event. This pattern is consistent with an opportunistic expansion model, initiated by the extinction of co-occurring groups such as aetosaurs, rauisuchians, and therapsids. However, this pattern could instead be a response to changes in global climatic distributions through the Triassic–Jurassic transition, especially given the increasing evidence that climate played a key role in constraining Triassic dinosaur distributions. Here, we test this hypothesis and elucidate how climate influenced early dinosaur distribution by quantitatively examining changes in dinosaur and tetrapod ‘climatic niche space’ across the Triassic-Jurassic boundary. Statistical analyses show that Late Triassic sauropodomorph dinosaurs occupied a more restricted ‘climatic niche space’ than other tetrapods and dinosaurs, being excluded from the hottest, low-latitude climate zones. A subsequent, earliest Jurassic, expansion of sauropodomorph geographic distribution is linked to the expansion of their preferred climatic conditions. Evolutionary model fitting analyses also provide evidence for an important evolutionary shift from cooler to warmer climatic niches later on, during the origin of sauropods. These results are consistent with the hypothesis that global abundance of sauropodomorph dinosaurs was facilitated by climatic change and provide support for the key role of climate in the ascendancy of dinosaurs.
Original languageEnglish
Pages (from-to)206-214
Number of pages14
JournalCurrent Biology
Volume33
Issue number1
Early online date16 Dec 2022
DOIs
Publication statusPublished - 9 Jan 2023

Bibliographical note

Not yet published as of 06/12/2022

Keywords

  • end-Triassic
  • Dinosauria
  • Sauropodomorpha
  • climate
  • evolution
  • macroevolution
  • paleoclimate

Fingerprint

Dive into the research topics of 'Climatic controls on the ecological ascendancy of dinosaurs'. Together they form a unique fingerprint.

Cite this