Scientists have confirmed that Belgica antarctica, the southernmost insect on Earth, is ingesting microplastics in the wild. Lab experiments reveal that while the insect's larvae survive short-term exposure, higher plastic levels lead to reduced fat reserves. The findings highlight the global reach of plastic pollution, even in isolated Antarctica.
An international team, led by researchers from the University of Kentucky's Martin-Gatton College of Agriculture, Food and Environment, has published the first study on microplastic effects on an Antarctic insect. The research, detailed in Science of the Total Environment in 2025, confirms plastic particles in wild specimens of Belgica antarctica, a rice-sized nonbiting midge unique to Antarctica.
The project originated in 2020 when Jack Devlin, then a Ph.D. student, was inspired by a documentary on plastic pollution. "Watching that film just blew my mind," Devlin said. "I started reading about plastic's effects on insects and thought, 'If plastic is turning up everywhere else, what about rare places like Antarctica?'"
Belgica antarctica larvae live in damp moss and algae mats along the Antarctic Peninsula, reaching densities of nearly 40,000 per square meter. These poly-extremophiles endure extreme cold, dryness, salinity, temperature fluctuations, and UV radiation while recycling nutrients in the soil ecosystem.
Despite Antarctica's remoteness, microplastics enter via ocean currents, wind, and human activities at research stations. In lab tests lasting 10 days, larvae exposed to high plastic concentrations showed no drop in survival or basic metabolism. However, they exhibited lower fat reserves, crucial for energy in harsh conditions. "Even at the highest plastic concentrations, survival didn't drop," Devlin noted. "Their basic metabolism didn't change either. On the surface, they seemed to be doing fine."
Fieldwork during a 2023 cruise collected larvae from 20 sites across 13 islands. Analysis of 40 specimens, using advanced imaging to detect particles as small as four micrometers, identified two microplastic fragments. Devlin views this as an early indicator: "Antarctica still has much lower plastic levels than most of the planet, and that's good news. Our study suggests that, right now, microplastics are not flooding these soil communities. But we can now say they are getting into the system, and at high enough levels they start to change the insect's energy balance."
With no land-based predators, plastics are unlikely to bioaccumulate significantly. Yet, concerns remain for long-term impacts, especially amid climate change. Future studies will examine prolonged exposure and multi-stress effects on Antarctic soil organisms. The work was funded by the Antarctic Science International Bursary, U.S. National Science Foundation, and National Institute of Food and Agriculture.
