Rapid Evolution of Competitive Ability in Larval Mixtures of the Housefly

EVOLUTION OF COMPETITIVE ABILITY IN MIXTURES OF DROSOPHILA MELANOGASTER : POPULATIONS WITH AN INITIAL ASYMMETRY

“…It has been argued that an initial asymmetry may be necessary for rapid evolution of competitive ability in mixtures of populations of the same species (Bryant and Turner, 1972). Presumably, the population favored by the asymmetry will evolve so as to be able to gain more of an advantage from the situation.…”

“…The short term effect on a population of being cultured in mixture with a reproductively isolated population of the same species has been investigated for some insects (Seaton and Antonovics, 1967;Sokal et al, 1970;Bryant and Turner, 1972;Dawson, 1972). In these experiments, phenotypically distinct populations were kept isolated by starting mixtures with inseminated females or samples of fertilized eggs, then collecting and separating by phenotype individuals of the next generation before they reached reproductive maturity.…”

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domestica (Bryant and Turner, 1972). It is possible that this difference in experimental design is responsible for the rapid positive responses found (Bryant and Turner, 1972). It is possible that this difference in experimental design is responsible for the rapid positive responses found (Bryant and Turner, 1972).

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“…domestica (Bryant and Turner, 1972). In the latter two experiments, one of the competing populations was given an initial headstart in mixtures.…”

The effect of genetic background on the fitness of diazinon resistance genotypes of the Australian sheep blowfly, Lucilia cuprina

“…Rapid modification of the fitness of different strains involved in competitive interaction has been reported previously (Seaton and Antonovics, 1967;Ayala, 1969;Bryant and Turner, 1972;White, 1978;Hartl and Jungen, 1979). Inter-and intra-specific larval competition is likely in natural populations of L. cuprina (Foster et a!., 1975).…”