Posted on Jun 6, 2010 in Biology | 1 comment
How do PCBs harm orcas?
Orcas, like other sea mammals, have been shown to contain moderate levels of many toxins, including PCBs. These toxins are ingested direcly from the seas water and from food sources that also cotnain these toxins. PCBs do not cause outright death. But extensive laboratory animal experiments and captive feeding studies of seals show contaminants can weaken immune systems, hamper reproduction and cause skin disorders and subtle changes in physiology. Similar effects must be expected in Orcas.
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