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Type: Artigo de periódico
Title: Chromosomal inversion polymorphism in Drosophila mediopunctata: seasonal, altitudinal, and latitudinal variation
Author: Ananina, Galina
Peixoto, Alexandre A.
Bitner-Mathé, Blanche C.
Souza, Wilma N.
Silva, Luciano Basso da
Valente, Vera L.S.
Klaczko, Louis B.
Abstract: The most polymorphic chromosome for inversions in Drosophila mediopunctata is the chromosome II, where 17 inversions have been found, eight of which occurring in the distal region and nine in the proximal region. We present an analysis of the chromosome II inversion polymorphism with respect to seasonal, altitudinal and latitudinal variation. In D. mediopunctata from the Parque Nacional do Itatiaia (southeastern Brazil), the frequencies of three of the distal inversions (namely DA, DS, and DP) vary seasonally. These inversions also show altitudinal clines in their frequencies. This microgeographic pattern was not observed on a macrogeographic scale. D. mediopunctata from Porto Alegre are less polymorphic for inversions than other populations, the most remarkable reduction occurring in the proximal region of chromosome II. There is a considerable difference between D. mediopunctata from Campinas and specimens from Serra do Japi, which are separated by only 50 km. In contrast, D. mediopunctata from Serra do Japi are much more similar to specimens from the Parque Nacional do Itatiaia, which is 200 km far.
Subject: cline
microgeographic variation
tripunctata group
Editor: Sociedade Brasileira de Genética
Rights: aberto
Identifier DOI: 10.1590/S1415-47572004000100011
Date Issue: 1-Jan-2004
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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