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Chromosomal polymorphism in urban populations of Drosophila paulistorum
Victor Hugo Valiati; Vera Lucia S. Valente
Departamento de Genética, Instituto de Biociências, Universidade Federal do Rio Grande do Sul, Caixa Postal 15053, 91501-970 Porto Alegre, RS, Brasil. Send correspondence to V.L.S.V. Fax: (051) 336-2011. E-mail: valiati@ifl.if.ufrgs.br and valente@ifl.if.ufrgs.br.
ABSTRACT
Drosophila paulistorum populations colonizing the urban area of Porto Alegre, southern Brazil, were studied with the objective of characterizing their chromosomal polymorphism in this new environment. Despite being geographically and ecologically marginal and the fact that the colonization of the urban area seems to be a recent event, the populations showed a large number of inversions on all chromosome arms. Differences regarding inversion frequencies . and percentage of heterozygosis were found when we compared the samples with respect to geographical, microenvironmental and temporal aspects. Such differences, however, could be attributed to both selective and stochastic factors.
Keywords: Chromosomal polymorphism; urban populations; Drosophila paulistorum.
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