Modelling the Sensitivity of Seabed Habitats to Combined Fishing Effects around Anglesey, North Wales (2011-2013).

  • English
  • wel
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A pilot study has been conducted to determine whether the theoretical combination of habitat sensitivity to fishing activity of different gear types. This theory was converted into a model, and run using combined fishing activity data, collected through the FishMap Mon pilot project, to predict the sensitivity of habitats. The objective of this data capture was to determine whether the data on resistance to fishing activity data for each fisheries habitat developed during the NRW habitat sensitivity project could be applied to the impact of cumulative fishing activity on each habitat. Specific aims of the modelling project were to: - Calculate footprint versus resistance curves for each fisheries habitat and fishing activity using the revised activity footprints calculated for the FishMap Mon project - Develop a methodology to model combined fishing effects - Test the methodology on Red Wharf Bay and Conwy Bay - Produce an output layer at 1 km grid resolution - Produce thematic maps The source GIS data was collated during the FishMap Mon project using a standard questionnaire and post-processing method. The resistance and intensity definitions were supplied by the FishMap Mon project team. The curves were calculated using an automated process to ensure processing was identical for all habitats and visually verified to ensure a good fit. This project was a pilot to determine feasibility of the use of such models, therefore the output data is suggestive of the habitat sensitivity.

Identification

Dynodydd
Identifier
NRW_DS115626
Teitl Amgen
Alternative Title
  • Modelu sensitifrwydd cynefinoedd gwaelod mor i effeithiau pysgota cyfun ogylch Mon (2011-2013).
Laith Metadata
Metadata Language
English
Lineage

Intertidal and subtidal habitats sourced from Phase 1 Biotope Mapping surveys and HABMAP projects were converted into 31 predictive fisheries habitats. Fishing intensity was derived from the density of fishing activity in the waters around Anglesey using data from FishMap Mon. 47 interviews were conducted with commercial fishermen, 26 with chartered boat operators and over 500 non-commercial fishermen (anglers, bait collectors, mussel gatherers etc). Each activity was assigned to a gear category and subsequent calculations of the intensity were completed and maps produced based on these values. Each gear type was assessed separately based on the specific intensities associated with specific gear used. The output model produced four spatial layers representing the following: - Maximum resistance value for any activity which occurred within each grid square and therefore shows the most optimistic interpretation of the outputs. - Minimum resistance value for any activity which occurred within each grid square and therefore shows the most pessimistic interpretation of the outputs. - Average resistance value for any activity which occurred within each grid square. The average resistance is calculated as a proportional average based upon polygon area and therefore represents the average impact on habitats affected by fishing activity. - The weighted average resistance value for each grid square. The weighted average resistance is calculated as a proportional average between the average resistance of areas affected by activity and the resistance.
Additional Information

Associated Report Title: Lush, C. 2014. Modelling Sensitivity of Seabed Habitats to Combined Fishing Effects. NRW Evidence Reports. Report No; 03/14, 53pp. This dataset was derived by implementing the theoretical work associated with: Nisbet K, Robinson LA, Frid CL. 2013. Final report for CCW (June 2013). University of Liverpool.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2014-03-21
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  exeGesIS SDM Ltd
Great House Barn, New Street, Talgarth, LD3 0HU
http://www.esdm.co.uk/
 

Extent

Extent

Hyd
Geographic Extent
Celtic Sea
Hyd
Geographic Extent
Irish Sea
Hyd
Geographic Extent
Menai Strait
Hyd
Geographic Extent
Caernarfon Bay
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
benthic boundary layer
 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ()

    Specification

    [A] The final report in Microsoft Word and Adobe PDF formats. [B] A CSV file containing the resistance and footprint data converted to flat file format used to calculate the curves [C] A CSV file containing the formula and calculated coefficients for each curve [D] A full set of best plot images produced in JPEG format showing, Original data points (red circles), Calculated best fit line (blue line), Equation of best fit line R-squared value [E] GIS layers and workspace in MapInfo format on which the maps in the report are based: - Resistance_1km.tab contains the processed data generalised to a 1km resolution. - Resistance.wor contains the generalised data thematically mapped by the resistance category.

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
Conformity
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Explanation
Degree
false
Lineage

Intertidal and subtidal habitats sourced from Phase 1 Biotope Mapping surveys and HABMAP projects were converted into 31 predictive fisheries habitats. Fishing intensity was derived from the density of fishing activity in the waters around Anglesey using data from FishMap Mon. 47 interviews were conducted with commercial fishermen, 26 with chartered boat operators and over 500 non-commercial fishermen (anglers, bait collectors, mussel gatherers etc). Each activity was assigned to a gear category and subsequent calculations of the intensity were completed and maps produced based on these values. Each gear type was assessed separately based on the specific intensities associated with specific gear used. The output model produced four spatial layers representing the following: - Maximum resistance value for any activity which occurred within each grid square and therefore shows the most optimistic interpretation of the outputs. - Minimum resistance value for any activity which occurred within each grid square and therefore shows the most pessimistic interpretation of the outputs. - Average resistance value for any activity which occurred within each grid square. The average resistance is calculated as a proportional average based upon polygon area and therefore represents the average impact on habitats affected by fishing activity. - The weighted average resistance value for each grid square. The weighted average resistance is calculated as a proportional average between the average resistance of areas affected by activity and the resistance.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • fishing activity
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
  • Habitat extent
  • Fishery characterisation
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Adolygu)
Date (Revision)
2021-01-06
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

The following data is considered OS derived data and is therefore jointly owned by NRW and the Ordnance Survey. This dataset is sensitive and restricted. The sensitive data is the precise locations of fishing activities, and the data also contains specific information about the fishing activities, and so is restricted to the FishMapMon Team and certain partners - contact the dataset owner for more information. Sensitive data must be kept confidential; general release is not permitted due to risk of harm to the environment or third parties. Sensitive data may only be released under an appropriate NRW Licence. Requests should be referred to NRW's Access to Information Officer. Data may be released freely if the sensitive records are removed in advance, or shown only at a coarser scale.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW and © Crown copyright 2013. All rights reserved. Natural Resources Wales, AC0000849444 Recipients may only re-use sensitive data in strict confidence under the terms of an appropriate NRW Licence. No publication or dissemination is permitted, except if sensitive records are removed in advance, or shown only at a coarser scale. Third parties seeking to re-use this data require a Licence issued by NRW. It allows re-use, reproduction and dissemination in any format or medium but only for non-commercial purposes, according to the terms and conditions of the Licence. Those seeking commercial re-use require a commercial licence available from the OS.
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313135363236 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-12-09T12:40:02.727Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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