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首页> 外文期刊>Chemosphere >The hydrological regime of a large Mediterranean river influences the availability of pollutants to mussels at the adjacent marine coastal area: Implications for temporal and spatial trends
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The hydrological regime of a large Mediterranean river influences the availability of pollutants to mussels at the adjacent marine coastal area: Implications for temporal and spatial trends

机译：地中海大河的水文状况影响邻近海洋沿海地区贻贝的污染物可用性：对时空趋势的影响

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摘要

The present study reports the levels and trends (1993-2013) of DDTs, PCBs and metals in mussels collected at two coastal sites influenced by the River Ebro discharges. Results showed that levels of PCBs, DDTs, Cd and Hg were related to water inputs from the river, while these did not seem to be the main source for the Pb, Zn, Cu and As levels observed. Significant relationships were observed between PCBs and DDTs levels and the river flowrate in the fast-flowing months, suggesting that overflow periods promoted the mobilization of contaminants from sediments, and their subsequent discharge and spreading across the sea. Results indicated that PCBs were effectively southwestern transported, probably in relation to their soluble behavior in stream waters, while DDTs were limitedly spread in seawater, likely due to their particulate behavior. Significant declining trends observed for some metals, PCBs and p,p' DDE may reflect the reduction of pollutants inputs along the river basin. However, the results also showed significant relationships between the river's flowrate in the fast-flowing months and PCBs and DDTs levels, and significant decreases on the river flowrate in some fast-flowing months during the long-term series studies. Both facts suggested that the reduction on overflow periods influenced the decreasing pollutants trends observed in mussels. The present study advises that decreasing trends in contaminant levels in Mediterranean estuarine coastal areas may be related not only to successful remediation works/policies, but also to the fluctuations on the hydrological regime of the rivers, which are directly linked to current climatic trends. (C) 2019 Elsevier Ltd. All rights reserved.
机译：本研究报告了在受埃布罗河排放影响的两个沿海地点采集的贻贝中的滴滴涕，多氯联苯和金属的含量和趋势（1993-2013年）。结果表明，PCBs，DDTs，Cd和Hg的含量与河流中的水输入有关，而这些似乎并不是所观察到的Pb，Zn，Cu和As的主要来源。在快速流动的月份中，观察到多氯联苯和滴滴涕水平与河流流量之间存在显着的关系，这表明溢流期促进了沉积物中污染物的迁移，以及随后污染物的排放和扩散。结果表明，多氯联苯有效地向西南方向运输，这可能与其在溪流水中的溶解行为有关，而滴滴涕则由于其颗粒行为而在海水中扩散有限。观察到某些金属，多氯联苯和p，p'DDE的显着下降趋势可能反映了流域内污染物输入的减少。但是，结果还显示，在长期序列研究中，快流月份的河流流量与多氯联苯和滴滴涕水平之间存在显着关系，而某些快流月份的河流流量显着减少。这两个事实都表明溢流期的减少影响了贻贝中污染物减少的趋势。本研究建议，地中海河口沿海地区污染物水平的下降趋势可能不仅与成功的整治工作/政策有关，而且与河流水文状况的波动有关，而这些波动与当前的气候趋势直接相关。 （C）2019 Elsevier Ltd.保留所有权利。

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  • 来源
    《Chemosphere》 |2019年第12期|124492.1-124492.11|共11页
  • 作者

  • 作者单位

    Inst Espanol Oceanog Ctr Oceanog Murcia Varadero 1 San Pedro Del Pinatar 30740 Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Contaminants; Mussel; Monitoring; Mediterranean sea; River hydrology; Climate change;

    机译：污染物;蚌;监控;地中海;河流水文学;气候变化;

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