Human pollutants pushing whales to extinction?
A report released Thursday noted high levels of cadmium, aluminum, chromium, lead, silver, mercury and titanium in tissue samples taken by dart gun from nearly 1,000 whales over five years. From polar areas to equatorial waters, the whales ingested pollutants that may have been produced by humans thousands of miles away, the researchers said.
“These contaminants, I think, are threatening the human food supply. They certainly are threatening the whales and the other animals that live in the ocean,” said biologist Roger Payne, founder and president of Ocean Alliance, the research and conservation group that produced the report.
The researchers found mercury as high as 16 parts per million in the whales. Fish high in mercury such as shark and swordfish — the types health experts warn children and pregnant women to avoid — typically have levels of about 1 part per million….
“The entire ocean life is just loaded with a series of contaminants, most of which have been released by human beings,” Payne said in an interview on the sidelines of the International Whaling Commission’s annual meeting.
Payne said sperm whales, which occupy the top of the food chain, absorb the contaminants and pass them on to the next generation when a female nurses her calf. “What she’s actually doing is dumping her lifetime accumulation of that fat-soluble stuff into her baby,” he said…
“The biggest surprise was chromium,” Payne said. “That’s an absolute shocker. Nobody was even looking for it.”
The corrosion-resistant metal is used in stainless steel, paints, dyes and the tanning of leather. It can cause lung cancer in people who work in industries where it is commonly used, and was the focus of the California environmental lawsuit that gained fame in the movie “Erin Brockovich.” …Wise found that the concentration of chromium found in whales was several times higher than the level required to kill healthy cells in a Petri dish, Payne said.
Posted by James on Friday, June 25, 2010