Chromosomal inversion polymorphism in Drosophila mediopunctata: seasonal, altitudinal, and latitudinal variation

Genetics and Molecular Biology

Galina Ananina²  Alexandre A. Peixoto¹  Blanche C. Bitner-mathé¹  Wilma N. Souza²  Luciano Basso Da Silva¹  Vera L.s. Valente¹  Louis B. Klaczko² 

[1] ,Universidade Estadual de Campinas Instituto de Biologia Departamento de Genética e EvoluçãoCampinas SP ,Brazil

关键词: cline;    microgeographic variation;    temperature;    tripunctata group;    Brazil;   

DOI  :  10.1590/S1415-47572004000100011

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License