Ecotoxicology

, Volume 16, Issue 1, pp 221–230 | Cite as

Chironomids: suitable test organisms for risk assessment investigations on the potential endocrine disrupting properties of pesticides

  • Verena Taenzler
  • Eric Bruns
  • Michael Dorgerloh
  • Verena Pfeifle
  • Lennart Weltje
Article

Abstract

Selecting an appropriate invertebrate assay has been a primary goal of national and international testing programs for endocrine disrupting chemicals. The available information on the endocrine system, its hormones and their modes of action in controlling physiological processes in invertebrates is limited and the selection of appropriate test species still presents a challenge. This paper outlines the development of a higher-tier full life cycle (FLC) test for pesticides with the non-biting midge Chironomus riparius (Insecta, Diptera, Chironomidae). As an insect, C. riparius represents the species’ richest and ecologically one of the most important groups of invertebrates. In addition, the endocrine system of insects is one of the best studied among the invertebrates. Acute and chronic tests with Chironomus spp. are commonly used for testing and risk assessment of agrochemicals. A chironomid FLC test protocol has been developed and its suitability investigated in an inter-laboratory comparison. The protocol used is based on existing OECD and US-EPA test methods. To verify the suitability of the test to generate endpoints that encompass adverse effects on the arthropod endocrine system, a juvenile hormone analog was selected as positive control substance. Results have demonstrated that the proposed chironomid FLC can be performed in separate laboratories and that the selected arthropod juvenile hormone mimic causes effects. However, the observed toxicity is not proof of an endocrine disruptive mechanism and could equally be evoked by other compounds. Contrary to a screening assay, which aims at revealing a substance’s mode-of-action, the FLC test generates robust, population-relevant endpoints that can be used in the risk assessment of agrochemicals. Since the initial results presented in this paper are encouraging we propose to complete the validation of this assay under OECD with high priority.

Keywords

Endocrine disrupting chemicals Invertebrates Chironomus riparius Life-cycle test 

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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Verena Taenzler
    • 1
  • Eric Bruns
    • 2
  • Michael Dorgerloh
    • 2
  • Verena Pfeifle
    • 3
  • Lennart Weltje
    • 4
  1. 1.Dr. Knoell Consult GmbHBioplex Centre for Life SciencesLeverkusenGermany
  2. 2.Department of EcotoxicologyBayer CropScience AGMonheimGermany
  3. 3.Jealotts Hill International Research Centre BracknellSyngenta Ltd.BerkshireUK
  4. 4.BASF AGAgricultural Centre—EcotoxicologyLimburgerhofGermany

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