Overcrowding factors of Chironomid larvae

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  • ユスリカ幼虫の過密度要因
  • ユスリカ幼虫の過密度要因〔英文〕
  • ユスリカ ヨウチュウ ノ カミツド ヨウイン エイブン

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The overcrowding factors of Chironomid larvae were proved in the cultures by breeding them in various numbers in a constant bottom area and in a constant number in various area. The factors delayed the midge emergence and decreased the emergence-rates significantly in both the factor-producing water and the conditioned water. The higher the larval density in the factor-producing phase, the more the midge emergence was delayed and dispersed. There were the linear regression between the logs of larval densities and the probits of emergence-rates in both factor-producing and bioassay phases. The production of growth-retarding and toxic factors was dependent on the larval density rather than the number of larvae in the culture.

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