PCB-con­cen­tra­ti­ons in polar bears on the decre­a­se

Hard to belie­ve, but the­re are good news for polar bears: bio­lo­gists from the uni­ver­si­ty of Trond­heim (Nor­way) have done rese­arch on tis­sue sam­ples collec­ted from fema­le polar bears. Their results show that poly­chlora­ted biphe­nyls (PCB) have drop­ped signi­fi­cant­ly bet­ween 1998 and 2008. The values for young bears are 59 % lower and tho­se of adult fema­les have decre­a­sed by 55 %. The actu­al con­cen­tra­ti­ons are still well capa­ble of doing harm to a bear’s repro­duc­ti­ve and immu­ne sys­tem, but the trend is without doubt good news.

PCBs have been used world­wi­de for mul­ti­ple tech­ni­cal pro­ces­ses, inclu­ding coo­ling agents and electric parts. Sin­ce 2004, the­re is a ban on PCB pro­duc­tion wit­hin the Stock­holm con­ven­ti­on sys­tem that has been signed by most major coun­tries, with a few excep­ti­ons, noti­ce­ab­ly the USA.

Source: Uni­ver­si­tät Trond­heim

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