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Effects of Two Insecticides on Survival, Growth and Emergence of Chironomus riparius Meigen


Effects of chlorpyrifos and cypermethrin on the survival, growth and emergence of Chironomus riparius were determined on a life-cycle study. Although neither cypermethrin nor chlorpyrifos affected larval survival or growth, a decrease in the number of emerged midges and in the number of females over males, as well as in female biomass, were found for both insecticides. The results from this study indicate that multiple biological endpoints and extended periods of exposure are needed in order to achieve a better screening of insecticide toxicity.

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The authors acknowledge ‘‘Fundacão para a Ciência e Tecnologia” (FCT) for its financial support to Ana Raquel Agra, in a form of a masters’ grant (SFRH/BM/8402/2002). This work was partially funded by FCT Project reference PTDC/BIA-BDE/72841/2006. The authors thank Abel Ferreira for assistance in the laboratory.

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Correspondence to Ana R. Agra.

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Agra, A.R., Soares, A.M.V.M. Effects of Two Insecticides on Survival, Growth and Emergence of Chironomus riparius Meigen. Bull Environ Contam Toxicol 82, 501–504 (2009).

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  • Chlorpyrifos
  • Cypermethrin
  • Life-cycle test
  • Chironomus