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The tiny treeshrew defies a pair of evolutionary rules

The tiny treeshrew defies a pair of evolutionary rules

Science
Jan. 5 (UPI) -- The tiny treeshrew is a breaker of evolutionary rules, specifically of the ecogeographical type.According to a new paper published this week in the journal Ecology and Evolution, the common treeshrew, Tupaia glis, flouts both the island rule and Bergmann's rule, a pair of rules describing expected geographical variation within a species.According to the island rule, specimens of small mammals living on islands tend to evolve larger bodies than their relatives on the mainland. Larger mammals tend to evolve smaller bodies on islands.Bergmann's rules describe the tendency for populations of a species to evolve larger bodies in colder climates, among higher latitudes, while populations closer to the equator, living in warmer climates, develop smaller bodies.Researchers measured...