Competition between three lines of Drosophila melanogaster

Competitive interactions in Drosophila melanogaster: recurrent selection for aggression and response

“…All of these experiments have identified considerable amounts of genetical variation with respect to competitive interactions (Eggleston, 1985;de Miranda and Eggleston, 1987) and this supports earlier evidence for the heritability of competitive ability in genetical mixtures of Drosophila (Mather and Cooke, 1962;Gale, 1964), Hordeum (Sakai and Gotoh, 1955) and Tribolium (Lerner and Ho, 1961). In addition, the results of competition experiments between D. melanogaster and D. simulans (Moore, 1952) and those between wild type and dumpy wing mutants of D.…”

Population inter-relationships I. Evolution in mixtures of Drosophila mutants

“…Nevertheless, selection for performance in mixtures has been rarely studied and only infrequently observed. Lerner and Ho (1961) and Gale (1964) failed to detect such changes, but used inbred lines, and even Moore (1952) who concluded "competitive ability can be developed by selection . .…”

“…Many other workers have shown that the ability to persist or gain ascendancy in mixtures is inherited; for example, Mather and Cooke (7962) and Gale (1964) have shown this in Drosophila, Sakai and Gotch ('955) in barley, and Lerner and Ho (1961) in Triboliumn.…”

Stabilising selection in Drosophila melanogaster

“…A technique devised by Bakker (1961) and modified by Gale (1964) was used. The flies were obtained from two lines (HI and HIT) derived from an Oregon, Samarkand cross which had been subjected to selection for high sternopleural chaeta number at 25° C. mean of the lines was 26 11, which is above the optimum value at both temperatures.…”