AI Article Synopsis
- Two applications of the insect growth regulator diflubenzuron were tested at concentrations of 0.7, 2.5, 7.0, and 30 µg/L to study its impact on benthic macroinvertebrates in replicated littoral enclosures.
- The most sensitive groups, Chironomidae and Ephemeroptera, showed significant negative effects at concentrations of 2.5 and 0.7 µg/L, respectively, while no harm was observed in Mollusca or Oligochaeta at any level.
- Taxonomic richness decreased significantly at concentrations of 7.0 and 30 µg/L, with community structure changes lasting for over 57 days after application.
Article Abstract
Two applications of the insect growth regulator diflubenzuron were made to replicate littoral enclosures at nominal concentrations of 0.7, 2.5, 7.0, and 30 &mgr;g/L. Assessment of the effects of this insecticide on benthic macroinvertebrate community structure was accomplished by measuring changes in abundance and taxonomic richness. Chironomidae and Ephemeroptera were the most sensitive groups sampled, with no observed effect concentrations of 2.5 and 0.7 &mgr;g/L, respectively. No adverse effects were observed on Mollusca or Oligochaeta at any of the test concentrations. Taxonomic richness was noticably reduced at 7.0 and 30 &mgr;g/L on all post-application sampling dates, producing changes in community structure that persisted for >/=57 days.
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