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Darwinian fitness in Drosophila. I. fitness components of Drosophila prosaltans*
Cláudia Márcia Aparecida Carareto; Celso Abbade Mourão+
Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, UNESP, 15055 São José do Rio Preto, SP, Brasil
+Deceased
ABSTRACT
The present study is an evaluation of the genetic diversity of three strains of Drosophila prosaltans, from Brazil, Costa Rica and Trinidad Tobago. Fifty females of each strain were observed for sexual activity during 60 minutes, and for egg laying and egg development, daily until the death of the flies. A total of 23 fitness components were measured for each strain: five concerned sexual activity (mating frequency, duration of the pre-copula, absolute and relative duration of the copula and the time to first copula), five concerned inseminated and uninseminated female activity (longevity, absolute and relative duration of the oviposition period, and total and daily number of eggs), and eight concerned progeny (number of eggs during the period in which viable eggs were produced, number of pupae and imagines, egg-pupa, pupa-imago and egg-imago viability, and duration of pupation and imaginal emergence period). Differences between the strains for 15 fitness components and for 23 among females of each strain are attributed to intra and interpopulational genetic variability.
Keywords: Darwinian fitness; Drosophila prosaltans.
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* Part of a thesis presented by C.M.A.C. to Instituto de Biociências, Letras e Ciências Exatas - UNESP.