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The evolutionary history of Drosophila buzzatii . XVI. Fitness component analysis in an original natural population from Argentina
Author(s) -
Hasson Esteban,
Vilardi Juan C.,
Naveira Horacio,
Fanara Juan J.,
Rodriguez Constantina,
Reig Osvaldo A.,
Fontdevila Antonio
Publication year - 1991
Publication title -
journal of evolutionary biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.289
H-Index - 128
eISSN - 1420-9101
pISSN - 1010-061X
DOI - 10.1046/j.1420-9101.1991.4020209.x
Subject(s) - biology , chromosomal polymorphism , fecundity , longevity , natural selection , population , genetics , natural population growth , evolutionary biology , chromosomal inversion , balancing selection , selection (genetic algorithm) , pupa , chromosome , karyotype , genetic variation , gene , ecology , demography , artificial intelligence , sociology , larva , computer science
Summary 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.