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The Genetics of Dacus oleae. V. Changes of Esterase Polymorphism in a Natural Population Following Insecticide Control-Selection or Drift?

Costas B. Krimbas and Spyros Tsakas
Evolution
Vol. 25, No. 3 (Sep., 1971), pp. 454-460
DOI: 10.2307/2407343
Stable URL: http://www.jstor.org/stable/2407343
Page Count: 7
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The Genetics of Dacus oleae. V. Changes of Esterase Polymorphism in a Natural Population Following Insecticide Control-Selection or Drift?
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Abstract

In laboratory experiments it has been found that the organophosphate insecticide dimethoate acts as a selective agent on gene A esterase polymorphism of adult Dacus oleae, selecting against the silent isoallele. However, in the small natural population of Haghioi Apostoli dimethoate does not seem prima vista to act as a selective agent; instead, observed gene frequency changes are a consequence of population size reduction (genetic drift). The method used to arrive at this conclusion is proposed as a general method for distinguishing selection from drift as a cause of gene frequency changes in natural populations. An indirect estimate of mutation rate for enzyme polymorphisms is also given (10-3 to 10-4). This estimate, however, includes migration as a factor mimicking mutation.

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