Studies on the intraspecific competition in dung-breeding flies : I. Effects of larval density on yellow dung fly, Scatophaga stercoraria L. (Diptera : Scatophagidae)

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  • 牛糞内に生息するハエ類の種内競合に関する研究 : I. ヒメフンバエ幼虫の密度効果
  • 牛糞内に生息するハエ類の種内競合に関する研究-1-ヒメフンバエ幼虫の密度効果〔英文〕
  • ギュウフンナイ ニ セイソクスル ハエルイ ノ シュナイ キョウゴウ ニカンス

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Abstract

The yellow dung fly, Scatophaga 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 whole, higher larval mortality, reduction of pupal volume (male reduced more remarkably than female) and shortening of developmental period were caused by high densities. But, 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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