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Life The Remake
Davis CA (SPX) Feb 28, 2006 UC Davis paleontologist Geerat Vermeij says evolution at this level, like the rest of history, is predictable. 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." 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. Community Email This Article Comment On This Article Related Links UC Davis Darwin Today At TerraDaily.com
Tourists Police Release 100 Turtles Saved From Pot In Indonesia
Kuta Beach, Indonesia (AFP) Feb 27, 2006Indonesian police and foreign tourists released on Thursday about 100 protected green turtles that were confiscated from a boat en route to the resort island of Bali, police said. "We released about 100 turtles of various sizes at Kuta Beach," water police officer Arief told AFP, adding that tourists also helped release the reptiles. |
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