Send to

Choose Destination
See comment in PubMed Commons below
Science. 2012 Feb 24;335(6071):959-62. doi: 10.1126/science.1213859.

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

Author information

Department of Earth and Atmospheric Sciences, University of Nebraska, Lincoln, NE 68588, USA.


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.

Comment in

[Indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire
    Loading ...
    Support Center