Same Story, Often Told

Summary (Mar 12, 2006): Life on Earth has been shaped by random events unique to the history of our planet, so it may be unlikely we’ll ever find similar life forms elsewhere. But paleontologist Geerat Vermeij says that many traits are so advantageous that they will appear again and again.

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Same Story, Often Told

based on an University of California, Davis release

If the history of life were to play out again from the beginning, it would have a similar plot and outcomes, although with a different cast and timing, argues UC Davis paleontologist Geerat Vermeij in a new paper in the Proceedings of the National Academy of Sciences.

"Evolution at this level, like the rest of history, is predictable, perhaps more predictable than people want to imagine," Vermeij said. "Many traits are so advantageous under so many circumstances that you are likely to see the same things again and again."

UC Davis paleontologist Geerat Vermeij says evolution, like the rest of history, is predictable. Click image for larger view.
Credit: University of California, Davis

Vermeij's view contrasts with that put forward by the late Stephen Jay Gould and others, who argued that the history of life is so dependent on improbable events and includes so many possible paths that the chances of repetition are vanishingly small. Vermeij argues that some innovations, such as photosynthesis, plant seeds, mineralized bones and even human language are just such good ideas that they would reappear, although at different times and in somewhat different forms.

Barnacles, for example, "desperately want to be mollusks," Vermeij said, although they are actually crustaceans related to crabs and lobsters. As adults, they have evolved a lifestyle similar to that of clams, mussels and another entire group of animals, the brachiopods.

Vermeij reviewed 23 evolutionary innovations thought to be unique, including the genetic code, sex, human language and feathers, and another 55 that turn up repeatedly. Most of the unique innovations -- with the exception of human language -- are ancient, more than half a billion years old. Many of the repeated innovations are known only from a few specimens that were part of much larger groups. Vermeij said that many of life's "unique" developments might just appear to be so because other species died out and were not preserved as fossils.

A "unique" innovation might also be the result of intense natural selection. For example, once the genetic code appeared, primitive organisms readily swapped genes, as bacteria still do today. Any variants or competitors to the genetic code that arose later would have been unable to spread and establish.

Vermeij thinks that these principles are universal.

"If we had an Earth-like planet, I think we'd see phenotypes and outcomes that parallel those on Earth," he said.

Related Web Pages

Seeing Forests in the Tree of Life
Rare Earth Debate Series
Interactive Presentation: The Life and Death of Planet Earth
Tree of Life
Eukaryotic Origins
The Tree of Life Web Project

Sunday, March 12, 2006