This Week in Science

In this week's Science, an international research team presents a global map of genetic diversity within species, revealing that for amphibians and mammals, such diversity is highest near the equator and that it is influenced by humans. Using publicly available DNA databases, investigators focused on a subset of DNA representing 4,500 amphibian and mammalian species, matching the data with geographic information. In all cases, genetic diversity was higher in the tropics than in cold climates.

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