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      Hybridization of bird species.

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      Science (New York, N.Y.)
      American Association for the Advancement of Science (AAAS)

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          Abstract

          Hybridization, the interbreeding of species, provides favorable conditions for major and rapid evolution to occur. In birds it is widespread. Approximately one in ten species is known to hybridize, and the true global incidence is likely to be much higher. A longitudinal study of Darwin's finch populations on a Galápagos island shows that hybrids exhibit higher fitness than the parental species over several years. Hybrids may be at an occasional disadvantage for ecological rather than genetic reasons in this climatically fluctuating environment. Hybridization presents challenges to the reconstruction of phylogenies, formulation of biological species concepts and definitions, and the practice of biological conservation.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          0036-8075
          0036-8075
          Apr 10 1992
          : 256
          : 5054
          Article
          256/5054/193
          10.1126/science.256.5054.193
          17744718
          9145447f-89ec-498a-b124-0e34bb9f8e42
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