Surface abrasion of seabeds by bottom contacting fishing gears - Mediterranean Sea (surface Swept Area Ratio)
Data on physical impact intensity caused by trawling (bottom otter trawl, twin bottom otter trawl, dredges) estimated from VMS (Vessel Monitoring System) data cross-referenced with the Community Fishing Fleet Register and, for French vessels, with the landing data between 2008 and 2020. The data is constituted of 14 rasters in a resolution of 1’x1’ (13 annual abrasion rasters between 2008 and 2020 and 1 raster representing the 90th percentile of inter-annual abrasion). The abrasion is expressed in swept area ratio per year for each layer. This work enabled the study of the trawling impact on benthic communities in the Gulf of Lions and Corsica. The objective was to better describe the spatial and temporal repartition of trawling in this area and its potential impact on benthic habitats.
Simple
- Title
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Surface abrasion of seabeds by bottom contacting fishing gears - Mediterranean Sea (surface Swept Area Ratio)
- Date (Creation)
- 2020-06-01
- Citation identifier
- FR-330-715-368-00032-IFR_MARBEC_Surf_SAR_MED_FR
- Citation identifier
- DOI:10.12770/8bed2328-a0fa-4386-8a3e-d6d146cafe54
- Abstract
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Data on physical impact intensity caused by trawling (bottom otter trawl, twin bottom otter trawl, dredges) estimated from VMS (Vessel Monitoring System) data cross-referenced with the Community Fishing Fleet Register and, for French vessels, with the landing data between 2008 and 2020. The data is constituted of 14 rasters in a resolution of 1’x1’ (13 annual abrasion rasters between 2008 and 2020 and 1 raster representing the 90th percentile of inter-annual abrasion). The abrasion is expressed in swept area ratio per year for each layer. This work enabled the study of the trawling impact on benthic communities in the Gulf of Lions and Corsica. The objective was to better describe the spatial and temporal repartition of trawling in this area and its potential impact on benthic habitats.
- Credit
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This work was supported by the IDEM (EU), Benthchal (EC2CO) projects and the Occitanie region
- Point of contact
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Organisation name Individual name Electronic mail address Role IFREMER
Jac Cyrielle
Author IFREMER
Vaz Sandrine
Author IFREMER
Publisher
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Thèmes Sextant
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/Human Activities/Recreational Fishing
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GEMET - INSPIRE themes, version 1.0
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Habitats and biotopes
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Sous-regions marines
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Western Mediterranean
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Cadre Réglementaire - SIMM
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Directive Cadre Stratégie pour le Milieu Marin (DCSMM)
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Thématiques - SIMM
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/Activités et Usages/Pêche et Aquaculture
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/Etat du Milieu/Habitats
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Type de jeux de donnée ODATIS
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/Processed data/Composite products
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DCSMM : Descripteurs
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D6: Sea-floor Integrity
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D1: Coastal benthic habitats
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D1: Biodiversité - Poissons
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D1: Fish and Cephalopods
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Ocean Hackathon - Ville
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Toulon
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- Use limitation
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Données sous Licence Creative Commons - Attribution + Pas d’Utilisation Commerciale + Partage dans les mêmes conditions (BY-NC-SA) : http://creativecommons.fr/licences/
- Access constraints
- Other restrictions
- Use constraints
- Copyright
- Spatial representation type
- Grid
- Distance
- 0.0166667 degree
- Language
- Français
- Character set
- UTF8
- Topic category
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- Imagery base maps earth cover
- Begin date
- 2008-01-01
- End date
- 2017-12-31
- Reference system identifier
- EPSG / WGS 84 (EPSG:4326) / 8.6
- Distribution format
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Name Version
- OnLine resource
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Protocol Linkage Name WWW:LINK
https://doi.org/10.1093/icesjms/fsv099 Publication 1
WWW:LINK
https://doi.org/10.1093/icesjms/fsw194 The footprint of bottom trawling in European waters: distribution, intensity, and seabed integrity
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_P90_08_2020
COPYFILE
Surf_SAR_MED_FR_P90_08_2020
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2008
COPYFILE
Surf_SAR_MED_FR_2008
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2009
COPYFILE
Surf_SAR_MED_FR_2009
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2010
COPYFILE
Surf_SAR_MED_FR_2010
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2011
COPYFILE
Surf_SAR_MED_FR_2011
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2012
COPYFILE
Surf_SAR_MED_FR_2012
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2013
COPYFILE
Surf_SAR_MED_FR_2013
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2014
COPYFILE
Surf_SAR_MED_FR_2014
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2015
COPYFILE
Surf_SAR_MED_FR_2015
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2016
COPYFILE
Surf_SAR_MED_FR_2016
- OnLine resource
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Protocol Linkage Name OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2017
COPYFILE
Surf_SAR_MED_FR_2017
COPYFILE
Surf_SAR_MED_FR_2018
COPYFILE
Surf_SAR_MED_FR_2019
COPYFILE
Surf_SAR_MED_FR_2020
- OnLine resource
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Protocol Linkage Name WWW:LINK-1.0-http--metadata-URL
http://dx.doi.org/10.12770/8bed2328-a0fa-4386-8a3e-d6d146cafe54 DOI du jeu de donnée
OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2018
OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2019
OGC:WMS
https://sextant.ifremer.fr/services/wms/pressions_impacts Surf_SAR_MED_FR_2020
- Hierarchy level
- Dataset
Conformance result
- Title
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RÈGLEMENT (UE) N o 1089/2010 DE LA COMMISSION du 23 novembre 2010 portant modalités d'application de la directive 2007/2/CE du Parlement européen et du Conseil en ce qui concerne l'interopérabilité des séries et des services de données géographiques
- Date (Publication)
- 2010-12-08
- Explanation
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See the referenced specification
- Statement
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This work attempts to approximate the approach used by Eigaard et al (2016-2017) based on aggregated VMS data on a 1'x1' grid.
- Description
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The raw data used were produced by Ifremer’s SIH (Système d’Information Halieutique) AlgoPesca procedure in order to keep only positions corresponding to fishing operations (non-null speed <= 4 kts, away from return harbour routes). Data was expressed in number of fishing hours and aggregated in 1’x1’ grid by flag, month, size class of vessel and gear type (corresponding to landing declarations or main fishing gear recorded in the Community Fishing Fleet Register.
- Description
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Abrasion depending on both vessel speed and type of gear used, different values of speed or horizontal trawl opening were attributed according to vessel’s length and flag thanks to bibliography, law regulations and experts’ knowledge (local trawl manufacturers, trawl owners and captains and fishery organization representatives). In the case of dredges (French ; ≤ 15m) speed was set at 3kt and opening to 4m before 2013 (included) and 3m after (JORF 2013; https://www.legifrance.gouv.fr/eli/arrete/2013/4/12/TRAM1309072A/jo/texte/fr). Speed of Italian vessels was also set at 3 kts and the horizontal trawl opening was estimated following Eigaard et al. (2016). Thus, Italian trawling had a horizontal trawl opening range between 77 m and 50 m depending on vessels’ length :
- ≥ 24 m : 77 m
- ]18-24] : 72 m
- ]15-18] : 58 m
- ]12-15] : 50 m
For all French and Spanish vessels < 24m, speed was set at 3.5 kt and at 4 kt for vessels equal or larger than 24m.
Horizontal trawl opening for Spanish vessels was fixed to 100m regardless their length. French twin-rig otter trawls used on vessel large or equal to 24 m were set vith a horizontal trawl opening of 110 m and vessels between 18 and 24m had a 95m opening. Other French bottom otter trawls opening range between 100 and 55 m depending on the vessel length :
- ≥ 24 m : 100 m
- ]18-24] : 75 m
- ]15-18] : 55 m
- ≤ 15 m : 55 m
Distance traveled by each vessel category inside a 1'x1' cell was determined by multiplying the speed of the ship by the number of hour spent in the cell. The area swept by each vessel was calculated for each cell by multiplying the distance traveled by the horizontal trawl opening (or dredge width). Ratio between cell‘s swept area and cell surface allows to obtain the abrasion caused by each flag/vessel length/gear type in each cell per month (Eigaard et al. 2016, 2017). These abrasions are summed by cell over each year to get an annual abrasion value for each cell. Inter-annual 90th percentile was calculated for each cell allowing to get a spatial representation of the maximum abrasion values experienced in the study area over a 10-year period, while avoiding extreme values or outliers.
Metadata
- File identifier
- 8bed2328-a0fa-4386-8a3e-d6d146cafe54
- Metadata language
- Français
- Other language
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Language Character encoding English UTF8
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2021-06-14T12:05:09
- Metadata standard name
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ISO 19115:2003/19139 - SEXTANT
- Metadata standard version
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1.0
- Metadata author
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Organisation name Individual name Electronic mail address Role IFREMER
Vaz Sandrine
Local service desk