Surveys for Desmoulin’s Whorl Snail Vertigo moulinsiana on Cors Geirch National Nature Reserve (NNR) / Sites of Special Scientific Interest (SSSI) and the Afon Penrhos floodplain and for Geyer's Whorl Snail Vertigo geyeri on Cors Geirch NNR in 2017
Arolygon o Falwen Droellog Desmoulin Vertigo moulinsiana ar Warchodfa Natur Genedlaethol Cors Geirch (NNR) / Safleoedd o Ddiddordeb Gwyddonol Arbennig (SoDdGA) a gorlifdir Afon Penrhos ac ar gyfer Malwen Droellog Geyer Vertigo geyeri ar Warchodfa Natur Genedlaethol Cors Geirch yn 2017
A survey was undertaken in October 2017 to determine the eastern distribution limits of Desmoulin's Whorl Snail Vertigo moulinsiana on the Afon Penrhos floodplain following a previous survey covering the western part of the site in 2016. Virtually all potentially suitable habitat was surveyed. Although most new survey areas proved negative, an additional 0.5ha of V. moulinsiana habitat was identified, this being contiguous with the occupied habitat block lying to the immediate west surveyed in 2016. Areas of habitat not supporting the snail were judged to be too dry and/or too acidic to support the snail. It is calculated that the minimum total area of the Afon Penrhos floodplain occupied by V. moulinsiana is 11.07ha, with a possible maximum of 13.2ha if a number of adjoining but potentially suitable un-surveyed areas also support the snail. The Afon Penrhos population is not only the largest of three in Wales, but also probably one of the largest in mainland Britain. The significance of the population here is further enhanced by recent considerable population losses at several Special Areas of Conservation (SACs) in southern England and on the nearby Corsydd Llyn SAC (Cors Geirch National Nature Reserve (NNR) / Site of Special Scientific Interest (SSSI)). Now that the probable full extent of the population on Afon Penrhos is known, it is recommended that the site should be notified as a SSSI to reduce any risk of loss or damage due to changes in site management.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
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DynodyddIdentifier
- NRW_DS121548
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Teitl AmgenAlternative Title
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Laith MetadataMetadata Language
- English
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Lineage
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Surveys were by visual searches and the collection of vegetation samples.
- Additional Information
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Willing, M.J. 2018. Surveys for Desmoulin’s Whorl Snail Vertigo moulinsiana on Cors Geirch NNR/SSSI and the Afon Penrhos floodplain & for Geyer’s Whorl Snail Vertigo geyeri on Cors Geirch NNR in 2017. NRW Evidence Report No. 258, 23pp, Natural Resources Wales, Bangor.
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Dyddiad cyfeirnod y set ddata (Cyhoeddiad)Dataset Reference Date (Publication)
- 2018-01-01
Temporal Extent
- Begin date
- 2017-10-16
- End date
- 2017-10-17
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Categori pwncTopic category
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BiotaBiota
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Extent
Extent
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HydGeographic Extent
- Wales (WLS)
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Distribution
Dosbarthiad
Distribution
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Fformat - Math a DisgrifiadFormat Type and Description
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Database
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Unknown
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- Specification
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Species records held on Welsh Invertebrate Database
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Documents
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Unknown
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- Specification
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Report as pdf format
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Database
(
Unknown
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Quality
Ansawdd Data
Data quality
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Cwmpas AnsawddQuality Scope
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DatasetDataset
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CydymffurfiadConformity
- 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
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Lineage
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Surveys were by visual searches and the collection of vegetation samples.
Keywords
Allweddair
Keywords
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2008-06-01
Allweddair
Keywords
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NRW Thesaurus
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- Desmoulin's whorl snail
- vertigo moulinsiana
- whorl snails
- ecological surveys
- entomological survey
- biological monitoring
- biological surveys
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2026-08-27
Spatial Reference System
Content
Gwybodaeth Cynnwys
Content Information
Proffil CNC
NRW Profile
Elfennau CNC
Custom Elements
- NRW Related Title
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Surveys for Desmoulin’s Whorl Snail Vertigo moulinsiana on Cors Geirch NNR/SSSI and the Afon Penrhos floodplain & for Geyer’s Whorl Snail Vertigo geyeri on Cors Geirch NNR in 2017
Constraints
Constraints
Limitations on Public Access and Use
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Math o GyfyngiadRestriction type
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Other restrictionsOther restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
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Cyfyngiadau DefnyddioUse constraints type
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Other restrictionsOther restrictions
- Other constraints
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© CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
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Dynodydd FfeilFile Identifier
- 4f4c4942-4343-5764-6473-313231353438 XML
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Laith MetadataMetadata Language
- English
- Parent Identifier
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Welsh Invertebrate Database (WID)
NRW_DS23774
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Math o adnoddResource type
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DatasetDataset
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Dyddiad MetadataMetadata Date
- 2026-10-07T12:34:03.597Z
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Enw Safonol MetadataMetadata Standard Name
- NRW
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Fersiwn MetadataMetadata Standard Version
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1.0