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Mosquito larvicides disrupt behavior and survival rates of aquatic insect predators

Abstract

Understanding the environmental effects of chemicals used in pest control on aquatic systems is crucial to ensure the conservation of beneficial non-target organisms. Mosquito larvicides are commonly applied to aquatic habitats; however, their non-target effects are not well understood. Our goal was to determine lethal and behavioral effects of insect growth regulators (IGRs) and surface films (SFs) on predaceous diving beetle adults and larvae, and damselfly and dragonfly nymphs in roadside ditch habitats. Behavioral effects were determined via bioassays quantifying predator movement, location, and larval mosquito predation. Using Principal Components Analyses, correlated behaviors were determined for each taxa, and compared within SF and IGR treatment levels. Surface films were lethal to beetle adults in the genus Laccophilus (Dytiscidae) at recommended and high concentrations. Laccophilus adult behavior changed in response to IGRs, those exposed to recommended and high concentrations were more active than controls. Larval Laccophilus mosquito consumption varied between SFs and IGRs. We conclude that SFs can harm aquatic organisms that require atmospheric oxygen, and both larvicides may have sublethal effects on hunting behaviors of aquatic insects. Future studies should focus on different larvicides, and a wider variety of aquatic taxa that interact with mosquito larvae.

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Data availability

The data that support our findings are available upon request.

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Acknowledgements

We thank J. Schaefer and W. Varnado for comments on an earlier version of this manuscript. We thank C. Dean Bermond for assistance with mosquito identification, advice, and help with laboratory and field tasks.

Funding

This work was supported in part by the Mississippi State Department of Health, and a grant-in-aid of research awarded to J.A. Nelsen from the Sigma-Xi Honor Society.

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Nelsen, J.A., Yee, D.A. Mosquito larvicides disrupt behavior and survival rates of aquatic insect predators. Hydrobiologia 849, 4823–4835 (2022). https://doi.org/10.1007/s10750-022-05021-5

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  • DOI: https://doi.org/10.1007/s10750-022-05021-5

Keywords

  • Culicidae
  • Predation
  • Non-target effects
  • Larvicides
  • Predator behavior