Projected amplification of food web bioaccumulation of MeHg and PCBs under climate change in the Northeastern Pacific.
Projected amplification of food web bioaccumulation of MeHg and PCBs under climate change in the Northeastern Pacific.
复制标题
DOI：
10.1038/s41598-018-31824-5
复制
发表时间：
2018-09-07
影响因子：
4.6
通讯作者：
Cheung WWL
中科院分区：
文献类型：
--
作者：
Alava JJ;Cisneros-Montemayor AM;Sumaila UR;Cheung WWL
气候变化增加了污染物在海洋生物体内的暴露和生物累积，造成了巨大的生态生理和生态毒理风险。在这里，我们应用营养动力学生态系统模型来研究气候变化下有机汞（甲基汞）和多氯联苯（PCBs）在东北太平洋海洋食物网中的生物积累。我们发现，化学品和营养群体之间的气候污染影响的敏感性在很大程度上是异质的。在高碳排放情景下（代表性浓度途径8.5），与无气候变化控制情景相比，到2100年，顶级捕食者（包括常驻虎鲸）体内的甲基汞和多氯联苯浓度预计将分别增加8%和3%。然而，甲基汞的放大水平随着碳排放量的增加而增加，而多氯联苯则会减少。甲基汞和多氯联苯之间的生物累积途径不同，以及不同程度的气候变化对食物网动态的改变，都决定了这种特殊的反应。预计中等营养级捕食者（奇努克鲑鱼）中气候引起的污染物放大率高于虎鲸（约10%）。总体而言，在高CO2排放量下，甲基汞的预测营养放大系数比多氯联苯高10倍。这一贡献强调了在评估海洋生态系统的气候风险时了解与人为有机污染物的相互作用的重要性。
Climate change increases exposure and bioaccumulation of pollutants in marine organisms, posing substantial ecophysiological and ecotoxicological risks. Here, we applied a trophodynamic ecosystem model to examine the bioaccumulation of organic mercury (MeHg) and polychlorinated biphenyls (PCBs) in a Northeastern Pacific marine food web under climate change. We found largely heterogeneous sensitivity in climate-pollution impacts between chemicals and trophic groups. Concentration of MeHg and PCBs in top predators, including resident killer whales, is projected to be amplified by 8 and 3%, respectively, by 2100 under a high carbon emission scenario (Representative Concentration Pathway 8.5) relative to a no-climate change control scenario. However, the level of amplification increases with higher carbon emission scenario for MeHg, but decreases for PCBs. Such idiosyncratic responses are shaped by the differences in bioaccumulation pathways between MeHg and PCBs, and the modifications of food web dynamics between different levels of climate change. Climate-induced pollutant amplification in mid-trophic level predators (Chinook salmon) are projected to be higher (~10%) than killer whales. Overall, the predicted trophic magnification factor is ten-fold higher in MeHg than in PCBs under high CO2 emissions. This contribution highlights the importance of understanding the interactions with anthropogenic organic pollutants in assessing climate risks on marine ecosystems.
登录
查看更多内容
DOI：
10.1007/s00244-015-0215-y
发表时间：
2016-01-01
影响因子：
4
作者：
Alava, Juan Jose;Ross, Peter S.;Gobas, Frank A. P. C.
通讯作者：
Gobas, Frank A. P. C.
影响因子：
11.4
作者：
Alava, Juan Jose;Ross, Peter S.;Gobas, Frank A. P. C.
通讯作者：
Gobas, Frank A. P. C.
影响因子：
11.4
作者：
Debruyn, AMH;Gobas, FAPC
通讯作者：
Gobas, FAPC
影响因子：
3.1
作者：
Christensen, V;Walters, CJ
通讯作者：
Walters, CJ
影响因子：
30.7
作者：
Cheung, William W. L.;Sarmiento, Jorge L.;Pauly, Daniel
通讯作者：
Pauly, Daniel