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Abstract
The abdominal pigmentation polymorphism of Drosophila polymorpha (Dobzhansky and Pavan, 1943) was estudied during the four seasons of the year, from March 1000 to March 2000, in populations from Ilha de Santa Catarina (Morro da Lagoa da Conceição e Sertão do Peri) and neighboring islands (Ratones Pequeno, Ratones Grande, Arvoredo e Campeche), aiming to establish the relations between this polymorphism and temperature variation. The results indicate an elevation in the frequency of darker abdominal pigmentation of flies collected on cold days, suggesting an action of natural selection involving thermal regulation.Downloads
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Copyright (c) 2001 Marcela X. Machado, Daniela C. de Toni, Paulo R. P. Hofmann

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