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      A theory of evolution above the species level.

      Proceedings of the National Academy of Sciences of the United States of America
      Adaptation, Biological, Animals, Biological Evolution, Genetics, Population, Mammals, Models, Biological, Mollusca, Selection, Genetic

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          Abstract

          Gradual evolutionary change by natural selection operates so slowly within established species that it cannot account for the major features of evolution. Evolutionary change tends to be concentrated within speciation events. The direction of transpecific evolution is determined by the process of species selection, which is analogous to natural selection but acts upon species within higher taxa rather than upon individuals within populations. Species selection operates on variation provided by the largely random process of speciation and favors species that speciate at high rates or survive for long periods and therefore tend to leave many daughter species. Rates of speciation can be estimated for living taxa by means of the equation for exponential increase, and are clearly higher for mammals than for bivalve mollusks.

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          Author and article information

          Journal
          1054846
          432371

          Chemistry
          Adaptation, Biological,Animals,Biological Evolution,Genetics, Population,Mammals,Models, Biological,Mollusca,Selection, Genetic

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