News From the Field
Natural Selection For Moderate Testosterone Surprises Scientists
May 4, 2010
A field study of the relationship between testosterone and natural selection in an American songbird, the dark-eyed junco, has defied some expectations and confirmed others. Scientists report in the June issue of the American Naturalist, that extreme testosterone production--high or low--puts male dark-eyed junco at a disadvantage in both survival and reproduction outside their semimonogamous breeding pairs.
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