John Wiley & Sons, Ltd.

A simulation study on effects of exposure to a combination of pesticides used in an orchard and tuber crop on the recovery time of a vulnerable aquatic invertebrate

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The aim of the conducted work was to assess whether populations effects and recovery times increase when a population of a vulnerable aquatic invertebrate is exposed to concentrations of one or multiple pesticides. The two sets of pesticide combinations are typical for orchard and tuber crops in The Netherlands. Exposure concentrations were predicted using the FOCUS step three modelling framework and the Dutch drainage ditch scenario. Recovery times were assessed using the MASTEP population model. We simulated the population dynamics and pesticide effects in a Monte Carlo style, by using EC50 values drawn from an arthropod species sensitivity distribution. In the tuber scenario, exposure to λ‐cyhalothrin resulted in long‐term effects, while exposure to the co‐occurring compound fluazinam hardly resulted in (additional) effects. In the orchard scenario, three pesticides resulted in large effects just after exposure, but pulse exposures to these compounds did not coincide. Probabilities of effects for the single compounds added up for the combination, whereas the recovery times were not higher for the combination compared to those associated with exposure to the individual compounds. The conclusion from our simulations is that exposure to the evaluated pesticide packages may lead to increased mortality probabilities and effect sizes of the combination but does not lead to longer recovery times for populations with synchronized reproduction than when exposed to the individual compounds. Environ Toxicol Chem © 2013 SETAC

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