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THE EVOLUTIONARY HISTORY OF DROSOPHILA BUZZATII . VIII. EVIDENCE FOR ENDOCYCLIC SELECTION ACTING ON THE INVERSION POLYMORPHISM IN A NATURAL POPULATION
Author(s) -
Ruiz A.,
Fontdevila A.,
Santos M.,
Seoane M.,
Torroja E.
Publication year - 1986
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1986.tb00534.x
Subject(s) - biology , chromosomal inversion , chromosomal polymorphism , longevity , natural selection , fecundity , evolutionary biology , selection (genetic algorithm) , karyotype , population , natural population growth , genetics , chromosome , zoology , gene , demography , artificial intelligence , sociology , computer science
The pattern of selection acting in nature on the chromosomal polymorphism of the cactophilic species Drosophila buzzatii was investigated by comparing inversion and karyotypic frequencies through four different life‐cycle stages: adult males, eggs, third‐instar larvae, and immature adults. All population samples were obtained in June 1981 at an old Opuntia ficus‐indica plantation near Carboneras, Spain. The analysis rests on several assumptions which are explicitly set forth and discussed. The results, if these assumptions prove true, indicate strong directional selection for larval viability acting on the second‐chromosome karyotypes and also suggest selective differences in fecundity and longevity. Heterotic selection, however, cannot be ruled out for other fitness components such as male mating success. This kind of selection could be operating on the fourth‐chromosome polymorphism as well. Some gene arrangements showed significant and opposite changes in frequency at different parts of the life cycle, thus demonstrating endocyclic selection.