Interspecies Competition in Laboratory Populations of Drosophila melanogaster and Drosophila simulans

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Abstract
In one complete generation of interspecies competition in laboratory populations, each species produced about equal total numbers of adults, but marked dominance of one species or the other occurred within each replicate. The degree of dominance observed in discrete populations was greater than would be expected by chance, and apparently represents a species interaction between ovipositing adults or between adults and larvae. A theoretical model of interspecies competition between melanogaster and simulans is presented.