Gregarious Oviposition in Drosophila Melanogaster Is Explained by Surface Texture.

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Abstract
Laboratory experiments showed that the previously reported tendency of D. melanogaster females to lay their eggs close to other Drosophila eggs and larvae, was really a response to surface texture. Oviposition was encouraged by a rough surface, and the presence of eggs and larvae on smooth food medium provided sufficient surface texture to stimulate egg-laying. Such an effect would certainly not be significant in natural breeding sites.