Larvae of D. melanogaster tend to pupate away from the light source whereas larvae of D. willistoni prefer relatively more illuminated areas for pupation. The respective responses to light intensity of these species are intensified when the two species are raised together. It is suggested that light intensity may serve as a factor, determining the degree of interspecific competition of Drosophilae.
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Rizki et al. (1953) studied this question.