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PW09 Pesticide I
(PW166) Effects of lambda-cyhalotrin on development, growth, survival and feeding rate of Chironomus riparius larvae.
Faria, M1, Silva, PCLD1, Maltby, L2, Nogueira, AJA1, Soares, AMVM1, 1 Department of Biology, University of Aveiro, Portugal2 Deptartment of Animal and Plant Sciences, University of Sheffield, United Kingdom
ABSTRACT- The pyrethroid insecticide lambda-cyhalotrin has a high intrinsic toxicity to aquatic invertebrates and may enter aquatic environments through spray drift or runoff. Here, we focused our research on the impact of this insecticide on several ecological parameters of the collector, Chironomus riparius. Bioassays were carried out in artificial streams to simulate the ecological conditions of natural lotic systems. Development, growth, survival and post-exposure feeding rate of Chironomus riparius larvae were measured under different concentrations of 14C-lambda-cyhalotrin. Post-exposure feeding rate was correlated with larvae size. Larvae development and growth were inhibited by lambda-cyhalotrin, therefore post-exposure feeding rate was reduced. No significant effect on larvae survival was found.
Key words: Lambda-cyhalotrin, Artificial streams, Chironomus riparius
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