Ancient Global Warming Drove Early Primates' Dispersal

Jul 25, 2006

The continent-hopping habits of early primates have long puzzled scientists, and several scenarios have been proposed to explain how the first true members of the group appeared virtually simultaneously on Asia, Europe and North America some 55 million years ago.

But new research using the latest evidence suggests a completely different migration path from those previously proposed and indicates that sudden, rapid global warming drove the dispersal.

Researchers from the University of Michigan, Johns Hopkins University School of Medicine and the Royal Belgian Institute of Natural Sciences present their findings in the July 25 issue of the Proceedings of the National Academy of Sciences.

Their work focuses on Teilhardina, an ancient genus that resembled the saucer-eyed, modern-day primates known as tarsiers. Like tarsiers, monkeys, apes and humans, Teilhardina was a true primate, or euprimate. In both Asia and Europe, the genus is the oldest known primate; in North America, it appears in the fossil record around the same time as another primate, Cantius. Previously, scientists had come up with four ways to explain the geographic distribution pattern.

The first is that primates originated in Africa and spread across Europe and Greenland to reach North America. Another possibility is that they originated in North America and traveled across a temporary land bridge connecting Siberia and Alaska. A third hypothesis is that primates had their origins in Africa or Asia and traveled through North America to reach western Europe. Finally, it has been suggested that the group originated in Asia and fanned out eastward to North America and westward to Europe.

In the new research, U-M paleontologist Philip Gingerich and coworkers re-evaluated the four hypotheses by comparing with unprecedented precision the times of first appearance of Teilhardina in Asia, Europe, and North America. To achieve such precision, they used a carbon isotope curve recently documented on all three continents. Carbon in the atmosphere, earth and living organisms differs in the proportion of carbon-12 and carbon-13 present. A flood of carbon-12 is associated with the onset of an event known as the Paleocene-Eocene thermal maximum (PETM), one of the most rapid and extreme global warming events recorded in geologic history. It was during the PETM that modern primates first appeared 55 million years ago. Teilhardina in Asia precedes the maximum flood of carbon-12, Teilhardina in Europe coincides with it, and Teilhardina in North America appears just after the maximum. Based on this evidence, the researchers concluded that none of previously proposed scenarios was likely. Instead, they propose that Teilhardina migrated from South Asia to Europe, crossing the Turgai Straits---an ancient seaway between Europe and Asia---and then spread to North America by way of Greenland.

The whole dispersal event happened within about 25,000 years.

"It is remarkable to be able to study evolutionary events so deep in the past with such precision," said Gingerich, who is the Ermine Cowles Case Collegiate Professor of Paleontology and director of the U-M Museum of Paleontology. "The speed of dispersal and the speed of evolutionary change during dispersal are near the maximum for such rates observed today, and the rapid change and dispersal were almost certainly driven by profound greenhouse warming at the Paleocene-Eocene boundary."

Gingerich's coauthors on the paper are Thierry Smith of the Royal Belgian Institute of Natural Sciences and Kenneth Rose of Johns Hopkins University School of Medicine. The researchers received funding from National Geographic Society, the Belgian Federal Science Policy Office and the U.S. National Science Foundation.

Source: University of Michigan

Explore further: Vast mine under British national park wins approval

Related Stories

African vultures declining at a critical rate

Jun 19, 2015

An international team of researchers, including leading scientists from the University of St Andrews, the Hawk Conservancy Trust and the University of York, say African vultures are likely to qualify as 'Critically ...

Pilot study reports on the career paths of doctorate holders

Jun 18, 2015

ESF has just published a report on a pilot study of the career paths of post-doctorates and doctorate alumni from five research funding and research performing organisations: AXA Research Fund, France, Fonds National de la ...

For those over 50, finding a job can get old

Jun 16, 2015

Results from a new study led the Georgia Institute of Technology's School of Psychology and University of Minnesota's Carlson School of Management show that, compared to younger job seekers, older adults ...

Recommended for you

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.