PCBs were industrial chemicals banned more than a decade ago after it was
After collecting skin biopsies from 50 killer whales in Iceland, researchers found significant differences in the concentrations and profiles of pollutants.
Killer whales who had a mixed dietthe concentration of PCBs was, on average, 9 times higher than that of killer whales, which fed mainly on fish. The researchers argue that future assessments of the status of killer whale populations should take into account a factor that was previously overlooked: individual differences in dietary sources, which can lead to increased health risks.
Killer whales are the main predators of the sea, and because they are at the top of the food web, they often feed on the most contaminated food.
Melissa McKinney, Associate Professor of the McGill Department of Life Sciences and the Canadian Research Department of Environmental Change and Environmental Stressors
Next, scientists are going to estimate the share of marinemammals in the diet of Icelandic and other North Atlantic killer whales. And also collect a large dataset of pollutants in killer whales across the Atlantic Ocean,
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