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Bottom trawling resuspends sediment and releases bioavailable contaminants in a polluted fjord

机译:底部拖网拖曳沉积物,并在污染的峡湾中释放出生物可利用的污染物

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摘要

Sediments are sinks for contaminants in the world's oceans. At the same time, commercial bottom trawling is estimated to affect around 15 million km~2 of the world's seafloor every year. However, few studies have investigated whether this disturbance remobilises sediment-associated contaminants and, if so, whether these are bioavailable to aquatic organisms. This field study in a trawled contaminated Norwegian fjord showed that a single 1.8 km long trawl pass created a 3-5 million m~3 sediment plume containing around 9 t contaminated sediment; ie. 200 g dw m~(-2) trawled, equivalent to c. 10% of the annual gross sedimentation rate. Substantial amounts of PCDD/Fs and non-ortho PCBs were released from the sediments, likely causing a semi-permanent contaminated sediment suspension in the bottom waters. PCDD/Fs from the sediments were also taken up by mussels which, during one month, accu mulated them to levels above the EU maximum advised concentration for human consumption.
机译:沉积物是世界海洋中的污染物汇。同时,据估计,商业海底拖网捕捞每年影响全球约1500万平方公里的海底。但是,很少有研究调查这种干扰是否能清除与沉积物有关的污染物,如果可以,这些污染物是否可被水生生物利用。这项对被污染的挪威峡湾进行的野外研究表明,一条长达1.8公里的拖网通道形成了3-5百万m〜3的沉积物羽流,其中包含约9吨被污染的沉积物。即。拖网捕捞200 g dw m〜(-2),相当于c。每年总沉淀率的10%。沉积物中释放出大量的PCDD / Fs和非原位多氯联苯,这很可能在底水中造成半永久性污染的沉积物悬浮。贻贝也吸收了沉积物中的PCDD / Fs,贻贝在一个月内积累了超过欧盟建议的人类最大食用浓度的水平。

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  • 来源
    《Environmental Pollution》 |2012年第11期|p.232-241|共10页
  • 作者单位

    Department of Systems Ecology, Stockholm University, S-10691 Stockholm, Sweden;

    Department of Systems Ecology, Stockholm University, S-10691 Stockholm, Sweden;

    Institute of Marine Science, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Turistgatan 5, S-453 21 Lysekil, Sweden;

    Norwegian Institute for Water Research (NIVA), Caustadalleen 21, NO-0349 Oslo, Norway;

    Norwegian Institute for Water Research (NIVA), Caustadalleen 21, NO-0349 Oslo, Norway;

    Norwegian Institute for Water Research (NIVA), Caustadalleen 21, NO-0349 Oslo, Norway;

    Norwegian Institute for Water Research (NIVA), Caustadalleen 21, NO-0349 Oslo, Norway;

    Institute of Marine Science, Department of Aquatic Resources, Swedish University of Agricultural Sciences, Turistgatan 5, S-453 21 Lysekil, Sweden;

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

    sediment resuspension; bottom trawling; contaminant; bioavailability; blue mussel; SPMD;

    机译:沉积物重悬;拖网底污染物生物利用度蓝贻贝SPMD;

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