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Nonlinear Dose-Response of Cadmium on Drosophila Larval Locomotion: Machine Learning Decodes Behavioral Complexity.
Shi Jin1,2, Chengpeng Wang2, Jie Shen1,2
1Key Laboratory of Micro-Nano Sensing and IoT of Wenzhou, Wenzhou Institute of Hangzhou Dianzi University, Wenzhou, China.
Archives of Insect Biochemistry and Physiology
|August 29, 2025
Summary
Cadmium exposure alters insect larvae movement, increasing speed but decreasing turning. This study reveals complex dose-dependent behavioral changes, crucial for assessing heavy metal neurotoxicity and ecological risks.
Area of Science:
- Environmental toxicology
- Neuroscience
- Behavioral ecology
Background:
- Cadmium is a widespread environmental contaminant with known neurotoxic effects.
- Assessing cadmium's impact on insect larvae behavior is crucial for ecological risk evaluation.
- High-resolution behavioral kinematics data are lacking for cadmium neurotoxicity studies in insects.
Purpose of the Study:
- To quantify the dose-dependent effects of cadmium on insect larval locomotion.
- To investigate cadmium's impact on velocity, angular velocity, directional preference, and trajectory.
- To utilize machine learning for precise behavioral analysis in Drosophila larvae.
Main Methods:
- Integrated machine learning-based trajectory tracking for behavioral analysis.
- Quantified locomotion velocity, angular velocity, and directional preference.
- Utilized Drosophila larvae as a model organism to study cadmium exposure.
Main Results:
- Cadmium exposure increased larval movement speed and active duration.
- Angular velocity and high angular velocity duration were significantly reduced.
- A U-shaped distribution was observed in average speed curves with dose.
- Medium concentrations showed increased trajectory complexity and individual variation.
- High concentrations led to enhanced activity but also increased movement complexity.
Conclusions:
- Cadmium induces complex, dose-dependent alterations in insect larval locomotion.
- Observed behavioral changes may involve neurotransmitter regulation, visual damage, and antioxidant pathways.
- Findings provide a basis for understanding cadmium neurotoxicity mechanisms and ecological risk assessment.
