Little is identified relating environmental contaminants in predators on the discontinue of a meals chain. A take a look at printed in Environmental Toxicology and Chemistry has demonstrated that current forms of brominated flame retardants gain in the tissues of killer whales near Norway and are also handed on to nursing offspring.
Investigators also detected human-made chemical substances called perfluoroalkyl substances (PFAS) in the tissues of grownup killer whales. Thresholds for nicely being effects of PFAS in marine mammals have to now not established, nonetheless the chemical has been linked to reproductive and endocrine effects in wildlife. Besides, polychlorinated biphenyls (PCBs), which get long been banned, were detected in the blubber of seven of the 8 killer whales in the take a look at at stages that exceeded the proposed threshold for toxicological effects in marine mammals.
“Stages of air pollution in top predators give now not most productive a demonstration of ecosystem nicely being, nonetheless of the persistence of chemical substances, passive mobility in the ambiance, and active biotransport with migrating animals,” the authors wrote. “Our results are relevant for the persisted environmental monitoring of contaminants in the Arctic.”