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Migratory Ducks Carry "Forever Chemicals" and PCBs
1 Nov
Summary
- Waterfowl in the Northeast Atlantic Flyway showed detectable PCBs, pesticides, and PFAS.
- Canada geese and wood ducks had lower contamination levels than black ducks.
- Existing consumption guidelines may be adequate, but risks vary by bird and preparation.
Migratory waterfowl harvested in the Northeast Atlantic Flyway have been found to carry detectable levels of polychlorinated biphenyls (PCBs), pesticides, and per- and polyfluoroalkyl substances (PFAS). A study examining five common game species across New York, Pennsylvania, Connecticut, and New Jersey collected 108 legally hunted birds between October 2021 and February 2022.
Researchers observed varying contamination levels among species, attributing differences to feeding patterns. Canada geese and wood ducks exhibited lower contamination compared to American black ducks and American green-winged teal. All tested birds contained PFAS, with PFOS identified in 102 samples.
While mercury levels were generally low, all 107 samples tested positive for PFAS. The study suggests that existing consumption guidelines, such as New York's recommendation of two waterfowl meals per month, may be appropriate for average consumers. However, higher exposure could pose cancer risks from PCBs, necessitating fewer meals per year for some.
Preparing waterfowl by trimming fat could reduce exposure. The findings, funded by the US Fish and Wildlife Service and the Association of Fish and Wildlife Agencies, will inform future consumption guidance for the region.
