Long-term effects of fenoxycarb on two mayfly species in artificial indoor streams

• Published in: Ecotoxicology and environmental safety 2004-06, Vol.58 (2), p.246-255
• Main Authors: Licht, Oliver, Jungmann, Dirk, Ludwichowski, Kai-Uwe, Nagel, Roland
• Format: Article
• Language: English
• Subjects: Animal, plant and microbial ecology; Animals; Applied ecology; Artificial indoor streams; Aufwuchs; Biological and medical sciences; Biomass; Carbamates - analysis; Carbamates - toxicity; Ecology - instrumentation; Ecology - methods; Ecology - standards; Ecosystem; Ecotoxicology; Ecotoxicology, biological effects of pollution; Ephemerella ignita; Fenoxycarb; Food Chain; Fresh water environment; Freshwater; Fundamental and applied biological sciences. Psychology; Insecta; Insecta - anatomy & histology; Insecta - drug effects; Insecta - physiology; Insecticides - toxicity; Larva - drug effects; Larva - growth & development; Mayfly; Metamorphosis, Biological - drug effects; Microcosm; Phenylcarbamates; Rhithrogena semicolorata; Rivers - chemistry; Sex Ratio; Time Factors; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - toxicity
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2003.08.021

The effects of the juvenile hormone analog fenoxycarb (CAS No. 72490-01-8) were investigated in artificial indoor streams. The results from aufwuchs and two mayfly species ( Rhithrogena semicolorata and Ephemerella ignita) are presented. Four concentrations ranging from 0.05 to 50 μg/L (with a spacing factor of 10) were tested. Fenoxycarb disappeared rapidly from the water phase (DT 50≈5 days in the highest concentration, less in the other concentrations). Physico-chemical parameters and aufwuchs were not affected by fenoxycarb. The mayfly R. semicolorata, introduced at the start of the experiment, was affected by treatments of 5 and 50 μg/L. For the larvae in the streams a LC 50 of 3.3 μg/L and for the larvae in the enclosures a LC 50 of 2.5 μg/L were calculated. The second species ( E. ignita) was introduced 72 days after the application, at which time no fenoxycarb was detectable in the water of the streams (limit of detection of 0.5 ng/L). The emergence of E. ignita was affected in the highest treatment (50 μg/L). Ninety percent of the emerged imagoes showed morphological abnormalities at the abdomen.