SummaryOptimal density (maximum adult production) was determined in 8 strains of Drosophila melanogaster reared on small amounts of food. The amount of uric acid excreted by each strain into the medium was also determined, as well as the resistance to toxic products (urea and uric acid) added to the media.Competitive dicultures between these strains were later established so that the total seeding density corresponded to optimal densities of each competitor. In these competitive systems, regressions higher than first order were found. The outcome for viability and developmental time in dicultures is explained in terms of the parameters studied in the monocultures : viability, developmental time, intrinsic mortality, optimal density, excretion of uric acid, and resistance to biotic wastes.
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