Evolution of the earliest horses driven by climate change in the Paleocene-Eocene Thermal Maximum.

Journal Article (Journal Article)

Body size plays a critical role in mammalian ecology and physiology. Previous research has shown that many mammals became smaller during the Paleocene-Eocene Thermal Maximum (PETM), but the timing and magnitude of that change relative to climate change have been unclear. A high-resolution record of continental climate and equid body size change shows a directional size decrease of ~30% over the first ~130,000 years of the PETM, followed by a ~76% increase in the recovery phase of the PETM. These size changes are negatively correlated with temperature inferred from oxygen isotopes in mammal teeth and were probably driven by shifts in temperature and possibly high atmospheric CO(2) concentrations. These findings could be important for understanding mammalian evolutionary responses to future global warming.

Full Text

Duke Authors

Cited Authors

  • Secord, R; Bloch, JI; Chester, SGB; Boyer, DM; Wood, AR; Wing, SL; Kraus, MJ; McInerney, FA; Krigbaum, J

Published Date

  • February 2012

Published In

Volume / Issue

  • 335 / 6071

Start / End Page

  • 959 - 962

PubMed ID

  • 22363006

Electronic International Standard Serial Number (EISSN)

  • 1095-9203

International Standard Serial Number (ISSN)

  • 0036-8075

Digital Object Identifier (DOI)

  • 10.1126/science.1213859


  • eng