Abstract
Effects of the organotin acaricide azocyclotin were studied in freshwater microcosms. Run-off conditions were simulated by applying the substance as soil slurry to nominal concentrations of 5, 15, 35, 135 and 405 μg/L, respectively. Plankton and benthon as well as physico-chemical water parameters were analysed regularly for effects over a period of 7 months. Zooplankton was affected at nominal concentrations ≥ 45 μg/L. Phyllopoda and nauplia of copepods reacted sensitively whereas direct effects on rotifers and ostracodes were not observed. Within the phytoplankton, picoplankton < 2 μm and algae of 2–10 μm were inhibited at nominal concentrations />/ 135 μg/L and blooms of less sensitive species were observed. Anaerobic microbial degradation activity in the sediment was stimulated in microcosms with high plankton mortality, but microbial biomass, measured as dehydrogenase activity, was not affected. Changes in meiozoobenthon structure were evident in microcosms treated with ⩾ 135 μg/L azocyclotin. The results indicate that under the experimental conditions nominal concentrations of 135 μg/L azocyclotin applied as soil slurry had severe effects on the biocenoses.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
