Impact of pesticide Cypermethrin and fish kairomone on the life history traits of Daphnia pulex

In freshwaters Daphnia, which help increasing water clarity due to its high grazing pressure and water filtration capacity, are fundamental for the conservation of aquatic biodiversity. In lake ecosystems, predation pressure and exposure to agricultural pesticides are among the most important factors affecting the Daphnia population. Therefore, the investigation of the adaptations of Daphnia under the combined influence of fish predation pressure and insecticides provides a new and more realistic ecological approach to the traditional toxicological approach because pesticides shown to disturb natural chemical communication significantly and thus pose an ecological risk. One of the commonly used pesticides in recent years in Turkey is the synthetic pyrethroid insecticide cypermethrin. The survival of the Daphnia pulex individuals exposed to cypermethrin levels between 0.01-5.00µg L-1 in the acute toxicity experiment indicated that these species might be more sensitive to cypermethrin in the presence of the fish kairomone, which was mimicked by fish kairomone. The chronic toxicity experiments, which were carried out at very low doses (ng L-1), suggested that there might be a trade-off between survival and reproduction, especially in the presence of fish predation pressure. These effects of cypermethrin in the presence and absence of fish predation pressure on Daphnia are discussed from an ecological perspective.
Citation Formats
S. B. Akkaş, G. Bezirci, and M. Beklioğlu, “Impact of pesticide Cypermethrin and fish kairomone on the life history traits of Daphnia pulex,” presented at the 5th Symposium for European Freshwater Sciences (SEFS 5) (8 - 13 Temmuz 2007), 2007, Accessed: 00, 2021. [Online]. Available: