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Forskningsartikel2012Vetenskapligt granskad

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

Bradshaw, C.; Tjensvoll, Ingrid; Sköld, Mattias; Allan, Ian J; Molvaer, J.; Magnusson, J.; Naes, K.; Nilsson, Hans

Sammanfattning

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, accumulated them to levels above the EU maximum advised concentration for human consumption. (c) 2012 Elsevier Ltd. All rights reserved.

Nyckelord

Sediment resuspension; Bottom trawling; Contaminant; Bioavailability; Blue mussel; SPMD

Publicerad i

Environmental Pollution
2012, Volym: 170, sidor: 232-241
Utgivare: ELSEVIER SCI LTD

      SLU författare

    • Globala målen

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      UKÄ forskningsämne

      Oceanografi, hydrologi, vattenresurser

      Publikationens identifierare

      DOI: https://doi.org/10.1016/j.envpol.2012.06.019

      Permanent länk till denna sida (URI)

      https://res.slu.se/id/publ/42571