Freshwater pearl mussel (Margaritifera margaritifera) larval encystment of host fish species on the Afon Eden – Cors Goch Trawsfynydd Special Area of Conservation (SAC)
The freshwater pearl mussel (Margaritifera margaritifera) is protected under several tiers of national and international legislation; EU Habitats and Species Directive Annexes II and V, UK Biodiversity Action Plan list of priority species, UK Wildlife and Countryside Act 1981 Schedule 5, Bern Convention Appendix 3, IUCN Red Data List as Critically Endangered. The Afon Eden - Cors Goch Trawsfynydd is the only Special Area of Conservation (SAC) site in Wales where the freshwater pearl mussel Margaritifera margaritifera forms the primary reason for selection of a site. Each year during early summer and when the water temperature is suitable, the female adult mussel releases larvae (glochidia) into the river where they are either ingested or inhaled by host salmonid fish. The species of host fish is specific to each pearl mussel population and prior to these encystment surveys it had been assumed that Atlantic salmon Salmo salar were the host for the Afon Eden population. The results of four annual surveys for gill encystment has proven that brown trout (including sea trout) Salmo trutta is the host species for the Afon Eden population. This dataset contains the results of extent of encystment during electrofishing surveys for salmonid species.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS116725
- Alternative Title
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- Larfaod codennog Fisglod Perl Dŵr Croyw (Margaritifera margaritifera) rywogaeth bysgodyn lletyol ar yr Afon Eden - Ardal Cadwraeth Arbennig (ACA) Cors Goch Trawsfynydd
- Metadata Language
- English
- Lineage
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The survey methodology consisted of annual electrofishing salmonids on Afon Eden and checking gills for glochidia encystment. Appendix in final summary report gives survey locations and should be kept confidential. Report contributes in EU LIFE Pearls in Peril project.
- Additional Information
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H Garrett (2016) Freshwater pearl mussel larval encystment of host fish species on the Afon Eden – Cors Goch Trawsfynydd SAC . NRW Evidence Report 164.
- Dataset Reference Date (Publication)
- 2016-07-31
Temporal Extent
- Begin date
- 2013-07-31
- End date
- 2016-07-31
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Distribution
- Format Type and Description
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Documents
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)
- Specification
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[A] Excel spreadsheet containing data [B] Word documents containing site locations
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Documents
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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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The survey methodology consisted of annual electrofishing salmonids on Afon Eden and checking gills for glochidia encystment. Appendix in final summary report gives survey locations and should be kept confidential. Report contributes in EU LIFE Pearls in Peril project.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- pearl mussels
- margaritifera margaritifera
- Afon Eden
- Atlantic salmon
- salmo salar
- brown trout
- salmo trutta
- sea trout
- salmo trutta
- 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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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. Sensitive details include the location of freshwater pearl mussel.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW 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
- 4f4c4942-4343-5764-6473-313136373235 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-07-03T08:47:30.586Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0