Modelling the Sensitivity of Seabed Habitats to Combined Fishing Effects around Anglesey, North Wales (2011-2013).
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.
Due to it's nature as a pilot project NRW no longer makes this data routinely available, alternative fisheries related data may be available on the Welsh Government Marine Planning Portal.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115626
- Metadata Language
- English
- Lineage
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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
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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.
- Dataset Reference Date (Publication)
- 2014-03-21
Temporal Extent
- Begin date
- 2011-01-01
- End date
- 2014-03-06
- Topic category
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- Oceans
Extent
Extent
- Geographic Extent
- Celtic Sea
- Geographic Extent
- Irish Sea
- Geographic Extent
- Menai Strait
- Geographic Extent
- Caernarfon Bay
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer
Distribution
Distribution
- Format Type and Description
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Documents
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)
- Specification
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[A] The final report in Microsoft Word and Adobe PDF formats.
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Delimited
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)
- Specification
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[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
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Image
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)
- Specification
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[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
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Geographic Information System
(
MapInfo
)
- Specification
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[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.
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Documents
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)
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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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
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
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NRW Thesaurus
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- fishing activity
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Keywords
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SeaDataNet Parameter Discovery Vocabulary
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- Habitat extent
- Fishery characterisation
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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Modelling sensitivity of seabed habitats to combined fishing effects
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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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
- Use constraints type
- Other restrictions
- Other constraints
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© 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.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135363236 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-08-21T10:55:37.484Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0