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dc.contributor.authorBuhl-Mortensen, Lene
dc.contributor.authorEllingsen, Kari Elsa
dc.contributor.authorBuhl-Mortensen, Pål
dc.contributor.authorSkaar, Kristian Landmark
dc.contributor.authorGonzalez-Mirelis, Genoveva
dc.coverage.spatialBarents Seanb_NO
dc.date.accessioned2017-12-11T09:19:30Z
dc.date.available2017-12-11T09:19:30Z
dc.date.created2015-11-18T11:25:38Z
dc.date.issued2016
dc.identifier.citationICES Journal of Marine Science. 2016, 73nb_NO
dc.identifier.issn1054-3139
dc.identifier.urihttp://hdl.handle.net/11250/2469901
dc.description.abstractBottom-trawl fisheries are expanding into deeper habitats and higher latitudes, but our understanding of their effects in these areas is limited. The ecological importance of habitat-forming megabenthos and their vulnerability to trawling is acknowledged, but studies on effects are few. Our objective was to investigate chronic effects of otter trawl fishery on substratum and megabenthos on the shelf (50–400 m) and slope (400–2000 m) in the southern Barents Sea. The study area represents a wide range in the history of fishing intensity (FI). Physical impact of trawling, density of trawl marks (TMs), was quantified on 250 video transects from shelf and slope, and megabenthos (.2 cm) composition was studied on 149 video transects from the shelf. The number of satellite-recorded vessels within grid cells 5 × 5 km was used as a proxy for FI in the TM analysis and for the megabenthos records within a 2-km radius around the transects. The effects of using different search area sizes were tested. Patterns in the density of TMs and megabenthos composition were compared with FI using linear regression and correspondence analysis. Occurrence of TMswas not directly related to FI but to bottom type, whereas megabenthos density and diversity showed a negative relation. For 79 of the 97 most common taxa, density was negatively correlated with FI. The sponges Craniella zetlandica and Phakellia/Axinella were particularly vulnerable, but also Flabellum macandrewi (Scleractinia), Ditrupa arietina (Polychaeta), Funiculina quadrangularis (Pennatulacea), and Spatangus purpureus (Echinoidea)were negatively correlated with FI, whereas asteroids, lamp shells, and small sponges showeda positive trend. Our results are an important step towards the understanding of chronic effects of bottom trawling and are discussed in relation to the descriptors “Biological diversity” and “Seafloor integrity” in the EU Marine strategic framework directive. Barents Sea, fishing pressure, management, megabenthos, sponges, trawling impact, video transects, VMS.nb_NO
dc.language.isoengnb_NO
dc.titleTrawling disturbance on megabenthos and sediment in the Barents Sea: Chronic effects on density, diversity, and compositionnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionpublishedVersionnb_NO
dc.subject.nsiVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480nb_NO
dc.source.pagenumber98-114nb_NO
dc.source.volume73nb_NO
dc.source.journalICES Journal of Marine Sciencenb_NO
dc.identifier.doi10.1093/icesjms/fsv200
dc.identifier.cristin1290334
dc.relation.projectNorges forskningsråd: 212135nb_NO
cristin.unitcode7511,4,0,0
cristin.unitnameTromsø
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode1


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