Special Area of Conservation (SAC) Monitoring: White Clawed Crayfish in River Wye SAC (2003)

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The inclusion of the white-clawed crayfish on Annex II of the EU Habitats and Species Directive requires Countryside Council for Wales (CCW) to identify Special Areas of Conservation for the species and to ensure that Favourable Conservation Status (FCS) applies. The purpose of this data capture was to undertake monitoring of the white-clawed crayfish and its habitat on the River Wye candidate Special Area of Conservation (cSAC) in order to report on condition as part of the assessment of Favourable Conservation Status for Natura 2000 features.

Identification

Dynodydd
Identifier
NRW_DS115577
Teitl Amgen
Alternative Title
  • Monitro'r Cimwch Crafanc Wen yn ACA Afon Gwy
Laith Metadata
Metadata Language
English
Lineage

Condition monitoring followed the Common Standards approach outlined by the Joint Nature Conservation Committee. Eight monitoring units (Afon Duhonw, Afon Edw, Afon Irfon, Afon Llynfi, Clyro Brook, Dulas Brook [Builth Wells], Nant yr Qffeiriad and Sgithwen Brook) were sampled following the protocol given by Peay (2002; see http://www.english-nature.org.uk/LIFEinUKRivers/monitoring.html ). A total of 16 x 500m stretches were selected randomly within each monitoring unit. Starting from the downstream end of the stretch, a 100m sampling site should be selected within each stretch which contains five suitable habitat patches measuring from 1 to 20m2. Within each habitat patch, 10 potential refuges (large cobble or boulder >15cm along longest axis) should be searched and the number of crayfish recorded. For each crayfish found, a number of attributes were recorded and a detailed record made of the physical attributes of all habitat patches sampled. The white-clawed crayfish is a proposed feature on the River Wye cSAC. Surveys in 1995 and 2002 have helped to determine its status and distribution, and identified the most important tributaries (Rogers and Holdich, 1995; Rogers and Watson, 2003), and this information has enabled the setting of provisional thresholds for condition assessment.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2003-10-31
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Countryside Council for Wales (CCW)
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
 

Extent

Extent

Hyd
Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ()

    Specification

    [A] The final report in Microsoft Word and Adobe PDF formats, individual Appendix's in Adobe PDF Format. [B] Data associated to each Appendix is held within Microsoft Excel Format [C] Maps associated to the report are in .GIF Format as well as each being on a Microsoft Word Document.

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

Condition monitoring followed the Common Standards approach outlined by the Joint Nature Conservation Committee. Eight monitoring units (Afon Duhonw, Afon Edw, Afon Irfon, Afon Llynfi, Clyro Brook, Dulas Brook [Builth Wells], Nant yr Qffeiriad and Sgithwen Brook) were sampled following the protocol given by Peay (2002; see http://www.english-nature.org.uk/LIFEinUKRivers/monitoring.html ). A total of 16 x 500m stretches were selected randomly within each monitoring unit. Starting from the downstream end of the stretch, a 100m sampling site should be selected within each stretch which contains five suitable habitat patches measuring from 1 to 20m2. Within each habitat patch, 10 potential refuges (large cobble or boulder >15cm along longest axis) should be searched and the number of crayfish recorded. For each crayfish found, a number of attributes were recorded and a detailed record made of the physical attributes of all habitat patches sampled. The white-clawed crayfish is a proposed feature on the River Wye cSAC. Surveys in 1995 and 2002 have helped to determine its status and distribution, and identified the most important tributaries (Rogers and Holdich, 1995; Rogers and Watson, 2003), and this information has enabled the setting of provisional thresholds for condition assessment.

 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • crayfish
  • astacida (astacidae) (see also specific crayfish species)
  • white-clawed crayfish
  • austropotamobius pallipes
  • Special Areas of Conservation (SAC) - SAC monitoring
  • River Wye Tributaries
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

Assessment of the condition of the white clawed crayfish in the river Wye cSAC
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
 

Use Constraints

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
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

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313135353737 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Condition monitoring of Special Areas of Conservation (SACs) in Wales

NRW_DS110194
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2025-03-07T17:06:01.834Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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