Climate Variability and Temporal Trends of Persistent Organic Pollutants in the Arctic: A Study of Glaucous Gulls
Climate Variability and Temporal Trends of Persistent Organic Pollutants in the Arctic: A Study of Glaucous Gulls
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DOI：
10.1021/es9032919
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发表时间：
2010-04-15
影响因子：
11.4
通讯作者：
Verreault, Jonathan
中科院分区：
文献类型：
--
作者：
Bustnes, Jan O.;Gabrielsen, Geir W.;Verreault, Jonathan
评估了气候变化对持久性有机污染物(POPs；多氯联苯、六氯苯和环氧氯丹)在挪威北极地区(n=240)养殖的时间趋势(1997-2006年)的影响。具有不同时滞的北极涛动(AO：北纬20度以上海平面气压变化指数)被用作气候指标。在此期间，苍鸥血/血浆中持久性有机污染物的估计浓度大幅下降(16%-60%)。多元回归分析表明，在控制潜在的混杂变量(性别和身体状况)后，持久性有机污染物的下降速度与气候变化有关。更具体地说，当前冬季的AO与POP浓度呈负相关，而与前一年POP测量(夏季之前的AO和冬季之前的AO)的相关性是正的。因此，在向北极空运较多的几年后，海鸥在繁殖季节有相对较高的POP浓度。此外，与重的氯化多氯联苯同系物相比，六氯苯的影响似乎更大，六氯苯是一种相对挥发性的化合物，具有很高的运输潜力。因此，这项研究表明，在评估北极野生动物POPs的未来时间趋势时，应考虑预测的气候变化。
The impact of climate variability on temporal trends (1997-2006) of persistent organic pollutants (POPs; polychlorinated biphenyls [PCB], hexachlorobenzene [HCB], and oxychlordane) was assessed in glaucous gulls (Carus hyperboreus) breeding in the Norwegian Arctic (n = 240). The Arctic Oscillation (AO: an index of sea-level pressure variability in the Northern Hemisphere above 20 degrees N) with different time lags was used as a climate proxy. The estimated concentrations of POPs in glaucous gull blood/plasma declined substantially (16-60%) over the time period. Multiple regression analyses showed that the rates of decline for POPs were correlated to climate variation when controlling for potential confounding variables (sex and body condition). More specifically AO in the current winter showed negative associations with POP concentrations, whereas the relationships with AO measurements from the year preceding POP measurements (AO preceding summer and AO preceding winter) were positive. Hence, gulls had relatively higher POP concentrations in breeding seasons following years with high air transport toward the Arctic. Furthermore, the impact of AO appeared to be stronger for HCB, a relatively volatile compound with high transport potential, compared to heavy chlorinated PCB congeners. This study thus suggests that predicted climate change should be considered in assessments of future temporal trends of POPs in Arctic wildlife.