Magellanic Penguins Serve as Indicators of PFAS Pollution

A recent study conducted by researchers from the University of California, Davis, and the State University of New York at Buffalo has revealed alarming levels of per- and polyfluoroalkyl substances (PFAS), commonly referred to as "forever chemicals," in Magellanic penguins along the Patagonian coast of Argentina. The study, published in the journal *Earth: Environmental Sustainability*, found that over 90 percent of the penguins tested were carrying signals of PFAS, raising concerns about the widespread impact of these chemicals on wildlife.

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PFAS are a group of more than 10,000 synthetic chemicals known for their durability, often used in products designed to be water- and grease-resistant, such as non-stick cookware and food packaging. These substances are notorious for their persistence in the environment, taking over 1,000 years to degrade. Their presence has been documented globally, from the peaks of Mount Everest to human blood samples and deep-sea species.

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The research team employed a novel method to monitor PFAS exposure in wildlife by fitting 54 Magellanic penguins with silicone leg straps that act as passive samplers. These devices absorb chemicals from the water, air, and surfaces the penguins encounter. This approach allows for less invasive monitoring compared to traditional methods, such as blood sampling or feather plucking. The retrieved samplers were analyzed at the University at Buffalo, revealing a mix of older legacy pollutants and newer PFAS compounds, including GenX, which are associated with industrial sources.

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Senior author Diana Aga emphasized the significance of these findings, stating, “The presence of GenX and other replacement PFAS shows that these compounds are not staying local but are reaching even the most remote ecosystems.”

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The study highlights the potential risks posed by newer PFAS, which, despite being marketed as safer alternatives, are still capable of spreading globally and affecting wildlife health. Co-author Marcela Uhart noted, “By turning penguins into sentinels of their environment, we have a powerful way to communicate issues relevant for wildlife health – and more broadly, for the conservation of marine species and our oceans.”

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The researchers plan to expand their monitoring efforts by applying the same sampling techniques to other species, such as cormorants, which can dive to significant depths. This initiative aims to enhance understanding of PFAS exposure across different wildlife populations.

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While the study presents a significant advancement in monitoring environmental pollutants, some critics argue that the focus on PFAS in wildlife may overshadow other pressing environmental issues. They contend that a broader approach is necessary to address the multifaceted challenges facing marine ecosystems.

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• “This raises important concerns that newer PFAS, despite being designed as safer alternatives, are still persistent enough to spread globally and pose exposure risks to wildlife.” — Diana Aga, Senior Author

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• “By turning penguins into sentinels of their environment, we have a powerful way to communicate issues relevant for wildlife health – and more broadly, for the conservation of marine species and our oceans,” — Marcela Uhart, Co-Author

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