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.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS116725
- Teitl Amgen
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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
- Laith Metadata
- English
- Datganiad
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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.
- Gwybodaeth ychwanegol
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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.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2016-07-31
Ystod amser
- Dyddiad cychwyn
- 2013-07-31
- Dyddiad gorffen
- 2016-07-31
- Categori pwnc
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- Biota
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
))
Dosbarthiad
- Fformat - Math a Disgrifiad
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Documents
(
)
- Math
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[A] Excel spreadsheet containing data [B] Word documents containing site locations
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Documents
(
)
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Cydymffurfiad
- 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
- Eglurhad
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Gradd
- false
- Datganiad
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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.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
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- pearl mussels
- margaritifera margaritifera
- Afon Eden
- Atlantic salmon
- salmo salar
- brown trout
- salmo trutta
- sea trout
- salmo trutta
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
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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.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
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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
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313136373235 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-07-03T08:47:30.586Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
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1.0