Penguins Help Detect Forever Chemicals in Remote Patagonia

Researchers have found that Magellanic penguins living along the Patagonian coast of Argentina are carrying detectable levels of per- and polyfluoroalkyl substances (PFAS), commonly known as “forever chemicals,” even in this remote region far from major industrial centers. The discovery, made using non-invasive silicone leg bands worn by the penguins during their foraging trips, reveals that both legacy PFAS and newer replacement chemicals are reaching pristine marine environments, raising concerns about global pollution spread and wildlife exposure risks.

The study, published in the journal Earth: Environmental Sustainability, involved equipping 54 Magellanic penguins with passive chemical samplers during the 2022–2024 breeding seasons. These silicone bands absorbed pollutants from the water, air, and surfaces the birds encountered while feeding their chicks. After retrieval, the samplers were analyzed at the University of Buffalo, where scientists detected PFAS in more than 90% of the samples.

“By using a non‑invasive sampling approach, we were able to detect a shift from legacy PFAS to newer replacement chemicals in the penguins’ environment over time,” said Diana Aga, lead author of the study and director of the UB RENEW Institute at the University of Buffalo. “The presence of GenX and other replacement PFAS—chemicals typically associated with nearby industrial sources—shows that these compounds are not staying local but are reaching even the most remote ecosystems.”

This finding is particularly significant because many of these replacement PFAS were developed under the assumption that they would break down more easily in the environment and pose fewer health risks than older compounds like PFOA and PFOS. However, their detection in Antarctic and sub-Antarctic wildlife suggests they are persistent enough to undergo long-range transport, challenging the notion that they are safer alternatives.

Ralph Vanstreels, a wildlife veterinarian with the UC Davis Karen C. Drayer Wildlife Health Center and co-corresponding author, emphasized the methodological innovation of the approach. “The only way we’ve had of measuring pollutant exposure in the past is by getting blood samples or feathers,” he said. “It’s exciting to have something that is only minimally invasive. The penguins are choosing the sample sites for us and letting us know where it’s important to monitor more deeply. As the animals go about their business, they’re telling us a lot about the environment they’re experiencing.”

The silicone samplers function as passive detectors, accumulating chemicals over time without harming the birds. This method allows researchers to map exposure patterns across space and time, offering a practical tool for monitoring pollution in hard-to-reach aquatic environments. The authors suggest the technique could be adapted to track contamination from oil spills, shipwrecks, or other industrial discharges.

Marcela Uhart, director of the Latin America Program at UC Davis and a coauthor on the study, highlighted the broader implications. “By turning penguins into sentinels of their environment, we have a powerful new way to communicate issues relevant for wildlife health and more broadly for the conservation of marine species and our oceans,” she said.

The research team plans to expand the method to other species, including cormorants, which can dive to depths exceeding 250 feet and may provide insights into deeper water contamination. The study was funded by the Houston Zoo and involved collaboration between the University of Buffalo, UC Davis, and Argentina’s National Scientific and Technical Research Council (CONICET).

While the study did not assess direct health effects on the penguins, the presence of PFAS in their systems adds to growing evidence that these chemicals are ubiquitous in global ecosystems. PFAS have been linked in human and animal studies to liver damage, immune suppression, developmental issues, and certain cancers, though risk assessments for wildlife remain limited. Experts note that long-term monitoring is needed to understand the ecological consequences of chronic low-level exposure in marine food webs.

As regulatory agencies worldwide grapple with how to manage PFAS pollution, findings like this underscore the challenge of containing chemicals designed to resist degradation. The detection of both old and new PFAS in remote penguin populations serves as a biological indicator that even the most isolated regions are not immune to the global footprint of industrial chemicals.