Combined exposure to sublethal concentrations of an insecticide and a fungicide affect feeding, ovary development and longevity in a solitary bee

Fabio Sgolastra, Xavier Arnan, Riccardo Cabbri, Gloria Isani, Piotr Medrzycki, Dariusz Teper, Jordi Bosch

    Research output: Contribution to journalArticleResearchpeer-review

    27 Citations (Scopus)

    Abstract

    © 2018 The Author(s) Published by the Royal Society. All rights reserved. Pollinators in agroecosystems are often exposed to pesticide mixtures. Even at low concentrations, the effects of these mixtures on bee populations are difficult to predict due to potential synergistic interactions. In this paper, we orally exposed newly emerged females of the solitary bee Osmia bicornis to environmentally realistic levels of clothianidin (neonicotinoid insecticide) and propiconazole (fungicide), singly and in combination. The amount of feeding solution consumed was highest in bees exposed to the neonicotinoid, and lowest in bees exposed to the pesticide mixture. Ovary maturation and longevity of bees of the neonicotinoid and the fungicide treatments did not differ from those of control bees. By contrast, bees exposed to the pesticide mixture showed slow ovary maturation and decreased longevity. We found a synergistic interaction between the neonicotinoid and the fungicide on survival probability. We also found an interaction between treatment and emergence time (an indicator of physiological condition) on longevity. Longevity was negatively correlated to physiological condition only in the fungicide and the mixture treatments. Delayed ovary maturation and premature death imply a shortened nesting period (highly correlated to fecundity in Osmia). Our findings provide a mechanism to explain the observed dynamics of solitary bee populations exposed to multiple chemical residues in agricultural environments.
    Original languageEnglish
    Article number0887
    JournalProceedings of the Royal Society B: Biological Sciences
    Volume285
    Issue number1885
    DOIs
    Publication statusPublished - 1 Jan 2018

    Keywords

    • Ecotoxicology
    • Ergosterol-biosynthesis-inhibiting fungicide
    • Neonicotinoids
    • Osmia bicornis
    • Pesticide cocktail
    • Synergism

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