Show simple item record

dc.contributor.authorTrannum, Hilde C
dc.contributor.authorRaymond, Caroline
dc.contributor.authorNæss, Rita
dc.contributor.authorBorgersen, Gunhild
dc.contributor.authorGunnarsson, Jonas S
dc.contributor.authorSchaanning, Morten T
dc.identifier.citationScience of the Total Environment. 2021, 776, 145971.en_US
dc.description.abstractThe Grenland fjords in Norway have a long history of contamination by large emissions of dioxins and mercury. As a possible sediment remediation method in situ, thin-layer capping with powdered activated carbon (AC) mixed with clay was applied at two test sites at 30 m and 95 m depth in the Grenland fjords. This study presents long-term effects of the AC treatment on the benthic community structure, i.e. nine years after capping. Capping with AC significantly reduced the number of species, their abundance and biomass at the two test sites, compared to uncapped reference sites. At the more shallow site, the dominant brittle star species Amphiura filiformis disappeared shortly after capping and did not re-establish nine years after capping. At the deeper site, the AC treatment also caused long-lasting negative effects on the benthic community, but some recovery was observed after nine years. Ecological indices used to assess environmental status did not capture the impaired benthic communities caused by the capping. The present study is the first documentation of negative effects of powdered AC on marine benthic communities on a decadal scale. Our results show that the benefits of reduced contaminant bioavailability from capping with AC should be carefully weighed against the cost of long-term detrimental effects on the benthic community. More research is needed to develop a thin-layer capping material that is efficient at sequestering contaminants without being harmful to benthic species.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleLong-term response of marine benthic fauna to thin-layer capping with powdered activated carbon in the Grenland fjords, Norwayen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2021 The Author(s).en_US
dc.source.journalScience of the Total Environmenten_US
dc.relation.projectNorges forskningsråd: 182720en_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal