These substances, ubiquitous and difficult to eliminate, accumulate gradually in living organisms. By analyzing raptors, at the top of the food chain, researchers have a valuable tool to measure the true extent of contamination.
PFAS: A Worrisome Accumulation in Raptors
Birds of prey play a key role in detecting PFAS in ecosystems, these “forever pollutants,” says a group of Italian researchers who published a paper on the topic in the journal Toxicology Mechanisms and Methods.
PFAS, often described as “forever chemicals,” are distinguished by their extreme persistence. They barely degrade and accumulate in the environment, from soils to oceans, and in living organisms. In this context, raptors play an important role. As apex predators, they concentrate pollutants found in their prey. This progressive accumulation reveals contamination levels invisible at other scales. Thus, studying them offers a global view of pollution. By observing these species, scientists can identify contaminated hotspots and detect pollution sources still unknown.
This new analytical method has detected PFAS concentrations up to 180 times higher than previous estimates in some birds. This dramatic jump underscores the scale of contamination. Moreover, contamination does not stop at adult individuals. PFAS can be transmitted from mothers to eggs, exposing nestlings early in development. In some cases, young birds even show PFAS concentrations 41% higher than those of their parents. These findings confirm bioaccumulation and intergenerational transmission, a particularly worrying trend for biodiversity.
Global Spread Throughout the Food Chain
PFAS are not confined to isolated zones. They originate from multiple industrial sources and everyday products, such as nonstick coatings, textiles, or food packaging. Once released, these substances spread through the environment. They contaminate soils, water, plants, and animals, before moving up the food chain to predators and, ultimately, to humans. Other studies also show that birds living near heavily exposed areas, such as certain military bases, have higher PFAS levels, illustrating the direct impact of human activity. This transfer mechanism demonstrates that chemical pollution knows no borders and can affect entire ecosystems.
Beyond the findings, the scientific interest in raptors lies in their role as a warning system. By analyzing these species, researchers can identify invisible pollutions and anticipate risks to other species, including humans. Recent work shows that these birds help detect PFAS sources previously unknown, paving the way for better environmental surveillance. In short, raptors act as advanced indicators of ecosystem health. Their study highlights not only the presence of PFAS but also their gradual spread and potential long-term effects.
