Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1897/07-322R.1
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Titel (primär) Acute and delayed effects of the neonicotinoid insecticide thiacloprid on seven freshwater arthropods
Autor Beketov, M.A.; Liess, M.
Quelle Environmental Toxicology and Chemistry
Erscheinungsjahr 2008
Department OEKOTOX
Band/Volume 27
Heft 2
Seite von 461
Seite bis 470
Sprache englisch
Keywords Thiacloprid; Chloronicotinyls; Freshwater invertebrates; Delayed effects; Risk assessment
Abstract Ecotoxicological risk assessment of contaminants is often based on toxicity tests with continuous-exposure profiles. However, input of many contaminants (e.g. insecticides) to surface waters typically occurs in pulses rather than continuously. Neonicotinoids are a new group of insecticides, and little is known about their toxicity to non-target freshwater organisms and potential effects on freshwater ecosystems. The aim of the present research was to assess effects of short-term (24-h) exposure to the neonicotinoid insecticide thiacloprid, including a post-exposure observation period. A comparison of several freshwater insect and crustacean species showed an increase of sensitivity by three orders of magnitude in the following order: Daphnia magna < Asellus aquaticus = Gammarus pulex < Simpetrum striolatum < Culex pipiens = Notidobia ciliaris = Simulium latigonium, with median lethal concentrations LC50s 4400, 153, 190, 31.2, 6.78, 5.47, and 5.76 µg/L respectively (post-exposure observation 11-30 d). Thiacloprid caused delayed lethal and sublethal effects, which were observed after 4 to 12 d following exposure. Reduction in LC50s found when post-exposure observation was extended from one day to a longer period (11-30 d) was up to >50-fold. Hence, delayed effects occurring after short-term exposure should be considered in risk assessment. The hazardous concentration HC5 of thiacloprid obtained here (0.72 µg/L) is more than one order of magnitude below the currently predicted worst-case environmental concentrations in surface water. Concerning the selection of test organisms, we observed that the widely employed test organism D. magna is least sensitive among the arthropods tested, and that for neonicotinoid insecticides an insect like the mosquito C. pipiens would be more suitable for predicting effects on sensitive species.
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Beketov, M.A., Liess, M. (2008):
Acute and delayed effects of the neonicotinoid insecticide thiacloprid on seven freshwater arthropods
Environ. Toxicol. Chem. 27 (2), 461 - 470 10.1897/07-322R.1