Diet determines orcas’ pollution exposure

None Priyanka Runwal
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Abstract

In 2001, more than 90 nations signed a treaty to reduce or possibly eliminate the production and use of the so-called dirty dozen highly toxic chemicals that accumulate in the environment. These include pesticides such as DDT and chlordane and industrial compounds such as polychlorinated biphenyls (PCB). All these chemicals take decades to break down, get passed along the food chain, and are hazardous to humans and animals. Over the years, at least a dozen more persistent organic pollutants have been added to the treaty’s list . Orcas, also known as killer whales, are among the most affected marine animals . A recent study led by McGill University researchers found that the North Atlantic Ocean orcas they studied that mostly ate fish were less contaminated than orcas that preyed on marine mammals such as seals and dolphins ( Environ. Sci. Technol. 2023, DOI: 10.1021/acs.est.3c05516 ). In the Canadian Arctic Ocean,
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饮食决定了逆戟鲸的污染暴露
2001年,90多个国家签署了一项条约,以减少或可能消除在环境中积累的所谓“肮脏的12种剧毒化学物质”的生产和使用。其中包括滴滴涕和氯丹等杀虫剂以及多氯联苯等工业化合物。所有这些化学物质都需要几十年的时间才能分解,并通过食物链传递,对人类和动物都是有害的。多年来,至少有十几种持久性有机污染物被添加到条约的清单中。逆戟鲸,也被称为虎鲸,是受影响最严重的海洋动物之一。麦吉尔大学(McGill University)研究人员最近进行的一项研究发现,他们研究的北大西洋逆戟鲸主要以鱼类为食,受污染程度低于捕食海豹和海豚等海洋哺乳动物的逆戟鲸(Environ)。科学。技术。2023,DOI: 10.1021/acs.est.3c05516)。在加拿大北冰洋
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