The evolutionary history of Drosophila buzzatii. XVI. Fitness component analysis in an original natural population from Argentina

Esteban Hasson, Juan C. Vilardi, Horacio Naveira, Juan J. Fanara, Constantina Rodriguez, Osvaldo A. Reig, Antonio Fontdevila

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32 Citations (Scopus)

Abstract

The adaptive significance of the chromosomal polymorphism of Drosophila buzzati has been studied by means of fitness component analysis in an original population from Argentina. The results show evidence of selection acting through pupal viability, longevity (adult viability) and fecundity on the second chromosome polymorphism, and through pupal viability and virility on the fourth chromosome polymorphism. Changes in chromosomal inversion frequencies throughout the life‐cycle suggested an endocyclic pattern of directional selection, which at first seems to be the only detectable mechanism responsible for the maintenance of the polymorphism. However, slow, long‐term frequency changes cannot be ruled out. The way in which endocyclic selection acts on this population is different from that in a colonized population previously studied; that is, different fitness components are involved in the maintenance of chromosomal polymorphism. The possible factors that may explain these differences are discussed. Copyright © 1991, Wiley Blackwell. All rights reserved
Original languageEnglish
Pages (from-to)209-225
JournalJournal of Evolutionary Biology
Volume4
Issue number2
DOIs
Publication statusPublished - 1 Jan 1991

Keywords

  • Chromosomal polymorphism
  • Drosophila
  • Endocyclic selection
  • Fitness
  • Natural populations

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