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Studies on the intraspecific competition in dung breeding flies 1. effects of larval density on yellow dung fly scatophaga stercoraria diptera scatophagidae


, : Studies on the intraspecific competition in dung breeding flies 1. effects of larval density on yellow dung fly scatophaga stercoraria diptera scatophagidae. Medical Entomology and Zoology 34(3): 165-175

S. stercoraria L. was tested to ascertain how intraspecific competition among larvae acts on the subsequent development. Various numbers of newly hatched larvae were reared with a fixed amount of cow dung to assess the density effects on the pupation, pupal volume, developmental period, emergence of adults and relation between the pupal size and the fly's wing length with special reference to the male and female. On the the whole, higher larval mortality, reduction of pupal volume (male reduced more remarkably than female) and shortening of developmental period were caused by high densities; however, the intensity of competition had no effect on the sex ratio of emerging flies within the observed range of densities. The ratio of the length of pupae to the width was almost settled in any sized pupae and without any significant difference between sexes. The relation between pupal size and the wing length of flies was well represented by a regression line.

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