Oil and gas exploration in the Arctic will increase the risk for accidental oil spills and thereby have a potential impact on the ecosystem and the organisms inhabiting these areas. Lipid rich copepods are an important food source for higher trophic levels in Arctic marine ecosystems. However, high lipid content and a slower metabolism increase the risk for bioaccumulation in Arctic species. Here we exposed three late development stages of the lipid rich high-Arctic copepod species Calanus hyperboreus to two different ¹⁴C-marked crude oil model compounds, the alkane dodecane (log K_ow 6.10) and the polycyclic aromatic hydrocarbon (PAH) phenanthrene (log K_ow 4.46) on a short-term scale of 4 days. Exposure was followed by a depuration phase of 3 days. We observed a difference in estimated bioaccumulation of the two model compounds between stages and found a slower depuration of dodecane than of phenanthrene in the two largest and most lipid rich stages. However, depuration of dodecane and phenanthrene was non-significant for all three stages. The results indicate that even short-term exposure may result in long-term bioaccumulation and internal exposure of oil compounds in the lipid rich high-Arctic copepods C. hyperboreus. Slow elimination and depuration of oil components indicate a risk for transfer of oil component up the food web to pelagic fish, seabirds and baleen whales.

在北极进行油气勘探将增加意外漏油的风险，从而对栖息于这些地区的生态系统和生物产生潜在影响。富含脂质的co足类动物是北极海洋生态系统中较高营养水平的重要食物来源。但是，高脂质含量和新陈代谢较慢会增加北极物种生物蓄积的风险。在这里，我们将富含脂质的高北极co足类Calanus hyperboreus的三个晚期发育阶段暴露于两种不同的¹⁴ C标记的原油模型化合物：烷烃十二烷（log K _ow 6.10）和多环芳烃（PAH）菲（log ķ_流4.46），为期4天。暴露之后是3天的净化阶段。我们观察到两个模型化合物在两个阶段之间的生物富集估计差异，并且发现在两个最大且最富脂质的阶段，十二碳的净化速度比菲的净化速度慢。然而，十二烷和菲的纯化对于这三个阶段均不重要。结果表明，即使是短期接触，也可能导致富含脂质的高北极co足类C. hyperboreus中油类化合物的长期生物蓄积和内部接触。缓慢消除和净化油成分表明存在将油成分沿食物网转移至浮游鱼类，海鸟和须鲸的风险。