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dc.contributor.authorGerritsen, H.D.
dc.contributor.authorMinto, C.
dc.contributor.authorLordan, C.
dc.date.accessioned2014-01-31T12:29:20Z
dc.date.available2014-01-31T12:29:20Z
dc.date.issued2013
dc.identifier.citationGerritsen, H. D., Minto, C., & Lordan, C. 2013. How much of the seabed is impacted by mobile fishing gear? Absolute estimates from Vessel Monitoring System (VMS) point data. ICES Journal of Marine Science: Journal du Conseil, 70(3), 523-531.en_GB
dc.identifier.issn1095-9289
dc.identifier.otherDOI: 10.1093/icesjms/fst017
dc.identifier.urihttp://hdl.handle.net/10793/950
dc.descriptionPeer- reviewed This is a pre-copy-editing, author-produced PDF of an article accepted for publication in ICES Journal of Marine Science following peer review. The definitive publisher-authenticated version is available online at: doi: 10.1093/icesjms/fst017en_GB
dc.description.abstractDemersal trawling impacts extensively on the seabed and the extent and frequency of this impact can be assessed using Vessel Monitoring Systems (VMS) data (positional data of fishing vessels). Existing approaches interpolate fishing tracks from consecutive VMS locations (track interpolation) and/or aggregate VMS point data in a spatial grid (point summation). Track interpolation can be quite inaccurate at the current 2-hour time interval between VMS records, leading to biased estimates. Point summation approaches currently only produce relative estimates of impact and are highly sensitive to the grid size chosen We propose an approach that provides absolute estimates of trawling impact from point data and is not sensitive to an arbitrary choice of grid cell size. The method involves applying a nested grid and estimating the swept area (area covered by fishing gear) for each VMS point. We show that the ratio of the swept area to the surface area of a cell can be related to the proportion of the seabed that was impacted by the gear a given number of times. We validate the accuracy of this swept-area ratio approach using known vessel tracks and apply the method to international VMS data in the Celtic Sea.en_GB
dc.description.sponsorshipFunder: Marine Instituteen_GB
dc.language.isoenen_GB
dc.publisherOxford University Pressen_GB
dc.relation.ispartofseriesICES Journal of Marine Science;70(3), 523-531
dc.subjectAutomatic Identification System (AIS)en_GB
dc.subjectImpact of trawlingen_GB
dc.subjectMarine Strategy Framework Directive (MSFD)en_GB
dc.subjectNested griden_GB
dc.subjectSwept-area ratioen_GB
dc.subjectVessel Monitoring Systems (VMS)en_GB
dc.titleHow much of the seabed is impacted by mobile fishing gear? Absolute estimates from Vessel Monitoring Systems (VMS) point dataen_GB
dc.typeArticleen_GB
refterms.dateFOA2018-04-23T11:58:18Z


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