Abstract
Reciprocal hybrids of two highly inbred strains of Drosophila melanogaster, Gabarros 4 and Abeele, were cultured, at a preimaginal population density of 30 eggs per standard vial at the temperatures of 16, 19, 22, 25, 28 and 31°C. Afterwards for every preimaginal temperature considered and for the whole life, the daily egg-production of females of known size and duration of development was counted, at 25°C. Life-span was also recorded. The mean total fecundity does not vary in function of the preimaginal temperature, exception made for the extreme 31°C. The mean daily egg-production, the size and the duration of development decrease with the increase in preimaginal temperature. Life-span at 25°C is prolonged when that temperature is decreased; life-span is thus positively correlated with size and duration of development. In a previous experiment, the life-span at 25°C of hybrids cultured at 25°C and at various preimaginal population densities was positively correlated with duration of development and negatively with size. The regressions longevity-duration of development observed in both experiments are of an identical sign; they differ however significantly. It is therefore concluded that longevity is not determined solely by preimaginal duration of development and that more of one developmental factor must be involved. The next paper in the series will compare and discuss the results of both experiments.
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