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Darwinian fitness in Drosophila. III. fitness components of Drosophila sturtevanti^*

Cláudia Márcia Aparecida Carareto; Celso Abbade Mourão⁺

Departamento de Biologia, UNESP, 15055 São José do Rio Preto, SP, Brasil
⁺Deceased

ABSTRACT

This is a study of 28 fitness components of 16 chromosomal constitutions of Drosophila sturtevanti originated from four strains: one with the standard arrangement in all chromosomes and the other three with the standard X chromosome arrangement and the same four inversions (about 22% of the genome) in homozygosis in chromosomes II and III. The fitness components are distributed among four fractions of total Darwinian fitness: four of sexual activity, 12 of progeny, nine of time of development and three of duration of emergence period of imagines. Data were analysed for effects of hybridization, variability of expression and relationships between the fitness components, and for heterogeneity of the chromosomal constitutions.

Keywords: Darwinian fitness; Drosophila sturtevanti.

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* Part of a Doctoral Thesis submitted by C.M.A.C. to the IBILCE-UNESP.