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ALDEHYDE OXIDASE ALLOZYMES, INVERSIONS AND DDT RESISTANCE IN SOME LABORATORY POPULATIONS OF DROSOPHILA MELANOGASTER

One of the most interesting observations about inversion polmorphisms in Drosophila is that large and often very rapid frequency changes occur both in nature and in laboratory populations. These changes are presumably the result of environmental changes since the fitness parameters of inversion karyotypes are highly dependent on specific environmental conditions like temperature, nutrition and population density (see Dobzhansky, 1970, for a review). The presence of insecticides in the environment has been suggested as a possible cause for long-term frequency changes of inversions in D. pseudoobscura (Cory et al., 1971; Anderson et al., 1975). However, extensive attempts to demonstrate changes in D. pseudoobscura karotype fitness parameters due to insecticides have failed (Anderson et al., 1968). Genetic analysis of insecticide resistant populations of D. melanogaster have also failed to provide evidence that inversion polymorphism was involved, although they were not specifically designed to do so (Bochnig, 1954; Crow, 1957; King, 1958; King and Somme, 1958; Kikkawa, 1958; Ogaki and Tsukamoto, 1953; Tsukamoto and Ogaki, 1953; Oshima, 1958). The experiments reported here were conducted with laboratory populations of Drosophila melanogaster that have been subjected to long-term selection for resistance to the insecticide DDT. Previous