Moses Sara K, Harley John R, Lieske Camilla L, Muir Derek C G, Whiting Alex V, O'Hara Todd M
Biological Services Division, Environmental Section, Great Lakes Indian Fish and Wildlife Commission, 72682 Maple Street, Odanah, WI 54861, USA.
Department of Chemistry and Biochemistry, University of Alaska Fairbanks, 900 Yukon Drive, Fairbanks, AK 99775, USA.
Mar Pollut Bull. 2015 Nov 15;100(1):122-127. doi: 10.1016/j.marpolbul.2015.09.020. Epub 2015 Oct 4.
Risk assessments of persistent organic pollutants (POPs) are often based on octanol-water (KOW) partitioning dynamics and may not adequately reflect bioaccumulation in air-breathing organisms. It has been suggested that compounds with low KOW and high octanol-air partitioning (KOA) coefficients have the potential to bioaccumulate in air-breathing organisms, including marine mammals. Here we evaluate differences in concentrations of POPs for two trophically matched Arctic species, spotted seal (Phoca largha) and sheefish (Stenodus leucichthys). We compared concentrations of 108 POPs in matched tissues (liver and muscle) across three ranges of KOW. We found a significant positive correlation between POP concentration and log KOA in spotted seal tissues for low log KOW compounds (log KOW <5.5, p<0.05). This provides further evidence for empirical models and observed bioaccumulation patterns in air-breathing organisms, and highlights the potential for bioaccumulation of these compounds in Arctic marine mammals.
持久性有机污染物（POPs）的风险评估通常基于正辛醇 - 水（KOW）分配动态，可能无法充分反映在空气呼吸生物中的生物累积情况。有人提出，具有低KOW和高正辛醇 - 空气分配（KOA）系数的化合物有可能在包括海洋哺乳动物在内的空气呼吸生物中生物累积。在此，我们评估了两种营养级匹配的北极物种——斑海豹（Phoca largha）和白鲑（Stenodus leucichthys）——体内持久性有机污染物浓度的差异。我们比较了在三个KOW范围内匹配组织（肝脏和肌肉）中108种持久性有机污染物的浓度。我们发现，对于低log KOW化合物（log KOW <5.5，p<0.05），斑海豹组织中的POP浓度与log KOA之间存在显著正相关。这为空气呼吸生物中的经验模型和观察到的生物累积模式提供了进一步证据，并突出了这些化合物在北极海洋哺乳动物中生物累积的可能性。
