New research indicates that climate change may be altering how pollutants move through Arctic ecosystems, with measurable effects even in land-based species such as the Svalbard reindeer.
A recent study examining contaminant exposure in these animals reports increasing levels of PFAS, a group of long-lasting industrial chemicals often referred to as “forever chemicals,” along with heavy metals such as mercury and cadmium. These substances are known for their persistence in the environment and their potential to affect animal and human health.
Although Svalbard is remote, pollution does not respect geography. Many contaminants originate in industrial regions further south and are transported northwards by atmospheric and ocean currents. Over time, they accumulate in snow, glaciers and permafrost. As temperatures rise and ice melts, these stored pollutants may be released back into the environment.
The study found that PFAS concentrations in reindeer have risen compared to earlier measurements from 2010, and that the chemical profile has changed, with a greater presence of long-chain compounds. These compounds are typically associated with long-range transport and environmental persistence.
Researchers also observed clear seasonal differences. Reindeer sampled in autumn showed higher contaminant levels than those sampled in late summer, likely due to longer feeding periods and seasonal changes in vegetation. As herbivores, reindeer are mainly exposed through the plants they consume, which can absorb pollutants from soil and meltwater.
The similarity between contaminant profiles in reindeer and those found in Arctic ice points to a possible link between melting glaciers and renewed exposure pathways.
While the levels detected remain below thresholds of concern for human consumption, particularly in meat, the findings highlight a growing issue. As the Arctic continues to warm, previously trapped pollutants may increasingly re-enter ecosystems, with uncertain consequences for wildlife.
Léa Zinsli, PolarJournal