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Related Concept Videos

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Related Experiment Video

Updated: Sep 13, 2025

Experimental Protocol for Using Drosophila As an Invertebrate Model System for Toxicity Testing in the Laboratory
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Combined Modeling of Multiple Exposure Routes for Terrestrial Arthropods Using the Toxicokinetic-Toxicodynamic

Leonhard U Bürger1, Florian Schunck1, Andreas Focks1

  • 1Osnabrück University, Barbarastr. 12, 49076 Osnabrück, Germany.

Environmental Science & Technology
|July 29, 2025
PubMed
Summary

This study presents a new model to assess pesticide risks for nontarget arthropods (NTAs) by integrating multiple exposure routes. The model enhances ecological risk assessment for better environmental protection.

Keywords:
GUTSNTATKTDenvironmental risk assessmentmechanistic effect modelingnontarget arthropodterrestrial arthropodtoxicokinetic–toxicodynamic

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Area of Science:

  • Environmental Toxicology
  • Ecotoxicology
  • Risk Assessment

Background:

  • Pesticide use in agriculture threatens beneficial insects like pollinators and pest predators.
  • Terrestrial pesticide exposure for nontarget arthropods (NTAs) is complex, variable, and occurs via multiple routes (e.g., overspray, ingestion).
  • Current risk assessments struggle to unify these diverse exposure pathways.

Purpose of the Study:

  • To extend the toxicokinetic-toxicodynamic (TKTD) BufferGUTS model to integrate multiple pesticide exposure routes for NTAs.
  • To develop a unified framework applicable across various NTA species without requiring species-specific data.
  • To provide insights into substance-specific effect dynamics based on different uptake routes.

Main Methods:

  • Extension of the TKTD and time-resolved BufferGUTS model incorporating principles of mixture toxicity.
  • Modeling individual effect contributions and kinetics for each pesticide uptake route.
  • Validation using honeybee (Apis mellifera) data for topical and oral exposure to five insecticides.

Main Results:

  • The model successfully integrated multiple exposure routes into a unified framework.
  • Most tested insecticides showed similar kinetics and effects regardless of topical or oral exposure.
  • One insecticide displayed route-specific kinetics, and three showed route-specific effects, highlighting the importance of route consideration.

Conclusions:

  • The developed TKTD model offers a robust method for assessing pesticide risks to NTAs across various exposure routes.
  • Integrating route-specific data enhances the accuracy of environmental risk assessments for pesticides.
  • The study recommends adopting such models for informed ecological management and protection strategies.