Sublethal insecticide exposure of an herbivore alters the response of its predator

Müller T, Gesing MA, Segeler M, Müller C (In Press)
Environmental Pollution.

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Zeitschriftenaufsatz | Im Druck | Englisch
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Sublethal insecticide exposure poses risks for many non-target organisms and is a challenge for successful implementation of integrated pest management (IPM) programs. Next to detrimental effects of short-term insecticide exposure on fitness-related traits of organisms, also properties such as chemical signaling traits can be altered, which mediate intra- and interspecific communication. We investigated the effects of different durations of larval sublethal exposure to the pyrethroid lambda-cyhalothrin on performance traits of larvae and adults of the herbivorous mustard leaf beetle, Phaedon cochleariae. Moreover, by applying a direct contact and olfactometer bioassays, we determined the reaction of a generalist predator, the ant Myrmica rubra, towards insecticide-exposed and unexposed herbivore larvae and their secretions. Already short-term sublethal insecticide exposure of a few days caused a prolonged larval development and a reduced adult body mass of males. These effects may result from an insecticide-induced reduction in energy reserves. Furthermore, ants responded more frequently to insecticide-exposed than to unexposed larvae of P. cochleariae and their secretions. This increased responsiveness of ants towards insecticide-exposed larvae may be due to an insecticide-induced change in synthesis of chrysomelidial and epichrysomelidial, the dominant compounds of the larval secretion, which act defensive against various generalist predators. In conclusion, the results highlight that short-term insecticide exposure can impair the fitness of an herbivorous species due to both direct toxic effects and an increased responsiveness of predators. Consequently, exposure of single non-target species can have consequences for ecological communities in both natural habitats and IPM programs.
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Environmental Pollution
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Müller T, Gesing MA, Segeler M, Müller C. Sublethal insecticide exposure of an herbivore alters the response of its predator. Environmental Pollution. In Press.
Müller, T., Gesing, M. A., Segeler, M., & Müller, C. (In Press). Sublethal insecticide exposure of an herbivore alters the response of its predator. Environmental Pollution. doi:10.1016/j.envpol.2018.12.040
Müller, T., Gesing, M. A., Segeler, M., and Müller, C. (In Press). Sublethal insecticide exposure of an herbivore alters the response of its predator. Environmental Pollution.
Müller, T., et al., In Press. Sublethal insecticide exposure of an herbivore alters the response of its predator. Environmental Pollution.
T. Müller, et al., “Sublethal insecticide exposure of an herbivore alters the response of its predator”, Environmental Pollution, In Press.
Müller, T., Gesing, M.A., Segeler, M., Müller, C.: Sublethal insecticide exposure of an herbivore alters the response of its predator. Environmental Pollution. (In Press).
Müller, Thorben, Gesing, MA, Segeler, M, and Müller, Caroline. “Sublethal insecticide exposure of an herbivore alters the response of its predator”. Environmental Pollution (In Press).

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