Spatial Conservation Status Modelling of the Great Crested Newt (Triturus cristatus) in South Wales (2013).
This dataset was compiled to build on previous related work conducted in North Wales and Powys. 12 Unitary Authorities in south Wales were assessed in terms of their Favourable Conservation Status for great crested newts (Triturus cristatus) using a habitat modelling approach. Project specific aims included assessing: i) known distribution, ii) suitable habitat, iii) survey target areas, iv) important populations for metapopulation connectivity, v) pond and habitat creation areas, and, vi) Local Population Targets (LPTs) for each unitary authority in South Wales, to develop a tool kit which can be used by local planners as an indication as to the presence of great crested newts. This tool kit includes spatially-explicit information in the form of GIS-based mapping (layers) and spreadsheets that will inform conservation priorities and action, land-use planning and other things such as derogation licensing. This project follows on from other recent attempts to describe the status of great crested newts (Triturus cristatus) in the UK and to apply the concept of Favourable Conservation Status (FCS). This is the third and final regional modelling exercise in Wales covering the country's core great crested newt range (Anglesey, NE Wales, Powys and South Wales between Gower and Monmouthshire). The integrated results will enable the first objective Wales-wide assessment of great crested newt status for the country. MaxEnt model testing produced acceptably high values (bigger than 0.7) for the area under the receiver operating characteristic (ROC) curve. Due to limited record numbers in individual Unitary Authorities, NRW built and tested the MaxEnt model with records from all 12 Unitary Authorities.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115774
- Alternative Title
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- Modelu Statws Cadwraethol Gofodol Madfallod Dŵr Cribog yn Ne Cymru (2013).
- Metadata Language
- English
- Lineage
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This research utilises high resolution (25 m) modelling to develop maps and metrics for great crested newts in 12 South Wales Unitary Authorities. High resolution, 1990-2011 great crested newt records were compiled which after quality control consisted of 149 records representing known populations. Distribution modelling software, MaxEnt, was used along with 24 environmental layers and a subset of 108 spatially filtered records, to produce an estimated probability of presence output. These outputs, and known barriers, were used to derive a resistance surface for calculating Least Cost Path distances and corridors between known populations. Graph theory software, Conefor, was run with these distances to produce probability of connectivity indices (dPC) to highlight important populations for maintaining metapopulation connectivity. To delimit pond creation target areas, we selected low pond density areas within modelled suitable habitat and within an appropriate Unitary Development Plan (UDP) designation. We set local population target figures to mitigate putative historical pond losses in each unitary authority, using a reference date of 1843, local pond loss rates and current pond data. We apportioned these targets to appropriate pond creation areas within cost weighted buffers surrounding known populations, or within corridors between them. The ultimate goal for this data was to develop draft Spatial Conservation Status Strategies for great crested newts in the 12 Unitary Authorities that make up the study area.
- Additional Information
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Associated Report Title: Spatial Conservation Status Modelling of the Great Crested Newt in South Wales (2013) Fletcher DH, Arnell AP, French GCA and Wilkinson JW. NRW Science Report No.30
- Dataset Reference Date (Publication)
- 2014-07-31
Extent
Extent
- Geographic Extent
- BRO MORGANNWG - THE VALE OF GLAMORGAN
- Geographic Extent
- ABERTAWE - SWANSEA
- Geographic Extent
- RHONDDA CYNON TAF - RHONDDA CYNON TAFF
- Geographic Extent
- CASNEWYDD - NEWPORT
- Geographic Extent
- CASTELL-NEDD PORT TALBOT - NEATH PORT TALBOT
- Geographic Extent
- SIR FYNWY - MONMOUTHSHIRE
- Geographic Extent
- MERTHYR TUDFUL - MERTHYR TYDFIL
- Geographic Extent
- CAERDYDD - CARDIFF
- Geographic Extent
- CAERFFILI - CAERPHILL
- Geographic Extent
- PEN-Y-BONT AR OGWR - BRIDGEND
- Geographic Extent
- BLAENAU GWENT - BLAENAU GWENT
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Distribution
- Format Type and Description
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Database
()
- Specification
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[A] Data held within the report pdf. format [B] Raw data for model building is held by ARC Trust
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Database
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Quality
Data quality
- Quality Scope
- Dataset
- 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
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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This research utilises high resolution (25 m) modelling to develop maps and metrics for great crested newts in 12 South Wales Unitary Authorities. High resolution, 1990-2011 great crested newt records were compiled which after quality control consisted of 149 records representing known populations. Distribution modelling software, MaxEnt, was used along with 24 environmental layers and a subset of 108 spatially filtered records, to produce an estimated probability of presence output. These outputs, and known barriers, were used to derive a resistance surface for calculating Least Cost Path distances and corridors between known populations. Graph theory software, Conefor, was run with these distances to produce probability of connectivity indices (dPC) to highlight important populations for maintaining metapopulation connectivity. To delimit pond creation target areas, we selected low pond density areas within modelled suitable habitat and within an appropriate Unitary Development Plan (UDP) designation. We set local population target figures to mitigate putative historical pond losses in each unitary authority, using a reference date of 1843, local pond loss rates and current pond data. We apportioned these targets to appropriate pond creation areas within cost weighted buffers surrounding known populations, or within corridors between them. The ultimate goal for this data was to develop draft Spatial Conservation Status Strategies for great crested newts in the 12 Unitary Authorities that make up the study area.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- protected sites
- great crested newts
- triturus cristatus
- environmental modelling
- Favourable Conservation Status (favourable condition)
- ecological connectivity
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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Spatial conservation status modelling of the Great Crested Newt in South Wales
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 raw datasets associated with the model outputs are wholly owned by Amphibian and Reptile Conservation Trust. NRW does not hold a copy of the data; enquirers are advised to obtain a copy from the owner/originator directly, rather than NRW. NRW may NOT publish or disseminate it in its entirety. The model output screen shots held within the report Spatial Conservation Status Modelling of the Great Crested Newt in South Wales. NRW Science Report Series. Report 30, are wholly owned by NRW. There are no access restrictions on these screenshots. NRW may release, publish or disseminate these freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© Amphibian and Reptile Conservation Trust, 2014. NRW does NOT grant permission to third parties to re-use or disseminate the raw dataset. Those seeking such permission should approach the originator directly. However the following applies to the model outputs and screen shots held within the report Spatial Conservation Status Modelling of the Great Crested Newt in South Wales. © CNC/NRW, 2014. There are no use restrictions on these screen shots. Recipients may re-use, reproduce, disseminate this data free of charge in any format or medium, provided they do so accurately, acknowledging both the source and NRW's copyright, and do not use it in a misleading context. It is the recipient's responsibility to ensure the data is fit for the intended purpose, that dissemination or publishing does not result in duplication, and that it is fairly interpreted. Advice on interpretation should be sought where required. To avoid re-using old data, users should periodically obtain the latest version from the original source.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135373734 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2025-03-07T17:30:49.882Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0