Natural selection is an immense and important subject, yet there
have been few attempts to summarize its effects on natural
populations, and fewer still which discuss the problems of working
with natural selection in the wild. These are the purposes of John
Endler's book. In it, he discusses the methods and problems
involved in the demonstration and measurement of natural selection,
presents the critical evidence for its existence, and places it in
an evolutionary perspective.
Professor Endler finds that there are a remarkable number of
direct demonstrations of selection in a wide variety of animals and
plants. The distribution of observed magnitudes of selection in
natural populations is surprisingly broad, and it overlaps
extensively the range of values found in artificial selection. He
argues that the common assumption that selection is usually weak in
natural populations is no longer tenable, but that natural
selection is only one component of the process of evolution;
natural selection can explain the change of frequencies of
variants, but not their origins.
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