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Chromosomal polymorphism in urban Drosophila willistoni^*

Vera Lucia S. Valente^I; Alexandre Ruszczyk^II; Roberto A. dos Santos^I

^IDepartamento de Genética, Universidade Federal do Rio Grande do Sul, Caixa Postal 15053, 91501-970 Porto Alegre, RS, Brasil. Send correspondence to V.L.S.V.
^IIDepartamento de Biociéncias, Universidade Federal de Uberlândia, 38405-382, Uberlândia, MG, Brasil

ABSTRACT

Urban populations of the wild species Drosophila willistoni were compared for chromosomal polymorphism. Populations were found to be less polymorphic for chromosome inversions nearer urban centers. Inversion IIL_E; showed higher frequencies assoeiated with greater vegetation-cover. Frequency of chromosome arn inversions IIL, IIR and III however did not correlate with the degree of urbanization. More variation in inversion frequencies was found for chromosome IlL, while chromosomes IIR and III seemed to be more invariable.

Keywords: Chromosomal polymorphism; Drosophila willistoni.

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* We dedicate this paper to Professor Warwick E. Kerr in honor of his 70^th birthday.