Aquatic ecotoxicology of the pyrethroid insecticide lambda-cyhalothrin: considerations for higher-tier aquatic risk assessment†
✍ Scribed by Maund, Stephen J.; Hamer, Michael J.; Warinton, Jacqueline S.; Kedwards, Timothy J.
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 170 KB
- Volume
- 54
- Category
- Article
- ISSN
- 1526-498X
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✦ Synopsis
Preliminary risk characterisation for the pyrethroid insecticide lambdacyhalothrin identiÐes potential concerns for Ðsh and aquatic invertebrates. Here we describe additional ecotoxicological studies for lambda-cyhalothrin generated to reÐne the aquatic risk assessment. These include tests conducted under more realistic exposure conditions (i.e. accounting for the rapid adsorption of lambdacyhalothrin to sediments), studies on sediment toxicity and bioavailability, tests on a range of Ðsh and invertebrate species in order to characterise sensitivity distributions, and Ðeld studies which have examined e †ects on invertebrate communities and Ðsh populations under semi-natural conditions. Fish are generally less sensitive to lambda-cyhalothrin than are aquatic invertebrates, and Ðsh species tend to be similar to each other in their sensitivities. Adsorption of lambda-cyhalothrin reduces exposure and hence the apparent toxicity of the compound to Ðsh, and under Ðeld conditions no adverse e †ects on Ðsh have been observed even at concentrations approaching the water solubility. For aquatic invertebrates, there is a wider range of sensitivities, with the Crustacea and Insecta predictably being the more sensitive taxa. Again, adsorption reduces the exposure of the chemical, and under Ðeld conditions no ecologically adverse e †ects have been observed at concentrations of c.0É02 lg litre~1.
1998 Society ( of Chemical Industry