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Effects of Microplastics and Cadmium on the Leptinotarsa decemlineata (Coleoptera: Chrysomelidae): An Evaluation Using a Two-Sex Life Table
Summary
Researchers found that when potato beetles were exposed to both microplastics and the toxic metal cadmium together, the damage to their survival and ability to reproduce was much worse than either pollutant alone. This matters because these same contaminants are building up in soil where our food grows, so understanding how they harm insects that eat plants helps us predict risks to our food supply and the environment.
This study utilized the age-stage, two-sex life table method to evaluate the toxic effects of polyethylene microplastics (PE, 300 mg/kg) and cadmium (Cd, 30 mg/kg), both individually and combined, on Leptinotarsa decemlineata. Compared to controls, all treatments significantly prolonged larval development and reduced survival, lifespan, and fecundity. The combined exposure (PE + Cd) exerted the strongest inhibition: the total pre-adult developmental duration (TPOP) increased by 18.8% (38.00 days), while the intrinsic growth rate (r) dropped by 59.0% to 0.0273 d−1. Additionally, the net reproduction rate (R0) and fecundity fell to their lowest levels (5.08 and 19.06, respectively), significantly lower than in single-treatment groups. Age-stage life expectancy analysis confirmed severe survival pressure in the combined group, evidenced by a 30% reduction in first-instar survival and a 14-day shortened adult lifespan. These findings demonstrate the synergistic toxicity of PE and Cd co-contamination, providing critical data for ecological risk assessment in the “soil–plant–herbivore” system and integrated pest management strategies.