Off the wire
Peace talks between Khartoum, SPLM/northern sector to resume in Berlin  • S. African gov't urged to declare severe drought "national crisis"  • U.S. SOCEUR Commander visits Slovak special forces  • Yemen's Houthis free detained minister, 4 pro-govt activists: UN envoy  • Spanish stock market falls 1.64 pct, closes at 8,787 points  • Austrian gov't to implement tougher stance on refugee influx: media  • Austrian export sees growth in 2015 despite trade collapse with Russia  • Sweden, Denmark sign agreement to deepen peacetime defense cooperation.  • U.S. Deputy Secretary of State to visit China for meeting  • Ghana kicks off nationwide search for U-17 players  
You are here:   Home

Europe's killer whales, dolphins threatened by PCB pollution: study

Xinhua, January 15, 2016 Adjust font size:

Despite regulations and mitigation measures to reduce PCB (polychlorinated biphenyl) pollution, it still poses a great threat to the population of killer whales and dolphins, in European seas, according to a study published online Thursday in the journal Scientific Reports.

As a chemical once used in electrical gear, paints and flame retardants, PCBs were banned in the US and EU by the end of the 20th century, due to their toxic effect in humans and animals.

But the new study, carried out by a team of international researchers, found that the chemicals' bio-magnification in marine food webs continued to cause severe impacts among cetacean top predators, including killer whales and dolphins, in European seas.

The researchers said parts of this PCBs might not be disposed of properly and were slowly leaking into rivers and estuaries from landfills, and eventually into the marine environment.

The team collected and analyzed samples from over 1,000 killer whales and dolphins in Europe's waters.

The results showed that PCBs still persisted at dangerously high levels in European cetaceans, which were higher than those found in cetaceans in the waters around America and in the Arctic. Europe's coastal killer whales appeared to be among the hardest hit by the PCB pollution.

The PCB pollution could affect cetaceans' breeding success and newborn calves, said Paul Jepson from Zoological Society of London (ZSL), who is one of the authors of the study.

Cetaceans are mammals, who have a very high-fat milk, so an adult female can offload up to 90 percent of her body burden of PCBs through the milk to the vulnerable calf, he said.

Co-author Robin Law, also from ZSL, urged global policymakers to act quickly and decisively to tackle the toxic legacy of PCBs, before it's too late for these ocean animals. Endit