Black grouse (Tetrao tetrix) National Surveys (Welsh data)
The male black grouse (Tetrao tetrix) population in Britain was surveyed in 1995/96 and 2005, in order to estimate population size. The surveys were based on counts of males displaying in the spring. In Wales and Staffordshire, the entire known population was surveyed in 1995. In northern England and Scotland in 1995/96 and 2005, and in Wales in 2005, a stratified random sample of 5 km squares from the breeding range was surveyed. As such the dataset covers around 10% of the UK population overall and does NOT contain all black grouse leks in Britain in the survey years; its aim was to produce a reliable population estimate. Please note that, apart from the 1995 Welsh data, the dataset does NOT contain all leks of black grouse, because only a random subsample of the breeding range was surveyed. Data have been thoroughly checked for geographical and other errors.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS114587
- Alternative Title
-
- Arolygon cenedlaethol o rugieir du (data Cymru)
- Metadata Language
- English
- Lineage
-
The survey covered the complete breeding range in Wales and Staffordshire in 1995, and random stratified 5 km squares selected from the breeding range in northern England and Scotland in both 1995/96 and 2005, and in Wales in 2005. In survey squares, surveyors walked within 500 m of all suitable habitat and counted any displaying males at dawn. Often local knowledge from landowners was used to locate leks. At least one count was made of each lek, within one hour either side of dawn, and if possible in clear, still weather. Display sites were marked on a 1:25 000 map. Single displaying males, and groups of displaying males (leks), recorded more than 500 m, and 200 m apart, respectively, on the same or different visits, were considered as separate display sites. When leks were counted more than once, the peak count was used. Numbers of females observed have been included in the comments field, but these do not represent a population figure due to the usually fleeting and irregular nature of female visits to leks.
- Additional Information
-
Part of this dataset is sensitive and therefore restricted. Currently records available at 10km at a public resolution, however if access is required at a finer resolution this will have to be issued under licence. See Resource Locator for further information.
- Dataset Reference Date (Publication)
- 2011-12-31
Temporal Extent
- Begin date
- 1995-01-01
- End date
- 2005-01-31
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
Distribution
- Format Type and Description
-
-
Documents
Documents
()
- Specification
-
[A] Spreadsheet
-
Documents
Documents
()
- Resource Locator
-
View and Download Data
World Wide Web page
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
The survey covered the complete breeding range in Wales and Staffordshire in 1995, and random stratified 5 km squares selected from the breeding range in northern England and Scotland in both 1995/96 and 2005, and in Wales in 2005. In survey squares, surveyors walked within 500 m of all suitable habitat and counted any displaying males at dawn. Often local knowledge from landowners was used to locate leks. At least one count was made of each lek, within one hour either side of dawn, and if possible in clear, still weather. Display sites were marked on a 1:25 000 map. Single displaying males, and groups of displaying males (leks), recorded more than 500 m, and 200 m apart, respectively, on the same or different visits, were considered as separate display sites. When leks were counted more than once, the peak count was used. Numbers of females observed have been included in the comments field, but these do not represent a population figure due to the usually fleeting and irregular nature of female visits to leks.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- black grouse
- tetrao tetrix
- Royal Society for the Protection of Birds (RSPB)
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
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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This data is jointly owned by NRW and RSPB. Part of this dataset is sensitive and restricted as it contains data exempt from general release under EIR. Sensitive data must be kept confidential; general release is not permitted due to risk of harm to the environment or third parties.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW and RSPB Cymru, 2011. Data may be re-used under provision and in line with the terms of a NRW licence and NRWs guidance on Ecological data exempt from general release.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313134353837 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-05-31T09:37:53.038Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0