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Evolution slows warm climate

March 19 2007

New species of birds and mammals develop and evolve more rapidly in the high latitudes than in the tropics, but the process of extinction there also is faster.

Results of the study showed why the biological diversity of birds and animals in the tropics is much higher than in other parts of the world. Jason Weier and Dolph Schluter of the University of British Columbia in Canada have created a map of the genetic tree of more than 300 species of mammals and birds of North and South America, who lived there over the past 10 million years.

The researchers focused their attention on the so-called sister species that are closely linked and have a common direct ancestor. It was found that the process of speciation, in which one species splits into two, is faster in temperate zones than the tropics.

Weyer said: "In the tropics, in order to from a common ancestor in the evolutionary process, there were two types require 3-4 million years, and at a latitude of 60 degrees, it could take just one million years." Tells MIGnews.

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