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

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.

Identifier: NRW_DS121548

Alternative Title

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

Metadata Language: English

Lineage: Surveys were by visual searches and the collection of vegetation samples.

Additional Information: 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.

Dataset Reference Date (Publication): 2018-01-01

Temporal Extent

Begin date: 2017-10-16

End date: 2017-10-17

Topic category

Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Willing

C/O Natural Resources Wales

http://naturalresources.wales/?lang=en

Extent

Geographic Extent: Wales (WLS)

Format Type and Description

Database ()

Specification

Database – records held in WID. Documents: pdf of the report in the DMS report archive.

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
Degree: false

Lineage: Surveys were by visual searches and the collection of vegetation samples.

Keywords

GEMET - INSPIRE themes, version 1.0

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

ecological surveys
biological surveys
biological monitoring
entomological survey
vertigo moulinsiana
whorl snails
Desmoulin's whorl snail

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

NRW Related Title: 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

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Restriction type: Other restrictions

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Limitations: no limitations

Access Constraints Text

Other constraints: There are no access restrictions on this data. NRW may release, publish or disseminate it freely.

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Use constraints type: Other restrictions

Other constraints: © 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.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313231353438 XML

Metadata Language: English

Parent Identifier: Welsh Invertebrate Database (WID)
NRW_DS23774

Resource type: Dataset

Metadata Date: 2024-05-31T09:41:30.578Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

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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

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Extent

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Data quality

Keywords

Keywords

Citation

Keywords

Citation

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Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

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