Intertidal Monitoring of Piddock Beds in Carmarthen Bay and Estuaries Special Area of Conservation (SAC) 2004
Technegau Monitro a Phriodoleddau Rhynglanwol Bae Caerfyrddin - Monitro Pidogau

  • English
  • wel
  • All

Under the 1992 EC Habitats and Species Directive, the UK submitted a list of candidate Special Areas of Conservation (cSACs) to the European Commission (EC). Each cSAC is selected for one or more of the habitat types and species listed in Annexes I and II of the Directive. This process was undertaken largely in 1995-1996. The piddock Pholas dactylus occurs in Britain from Kent along the south and south-west coasts including south Wales, Anglesey and Solway (Hill 2004). It has also been recorded from several sites on the east coasts of Yorkshire and Northumbria and southwest Ireland. The surface of the peat or clay bed is characterised by dense algal mats and pools of standing water (JNCC 2004). The presence of piddocks is instantly identified by holes in the substratum. The aim of this data capture was to map the current known extent and density of boring molluscs, piddocks, across the biotope at Marros Sands and Whiteford Point, and record any mussel spat or seed on the biotope. Piddocks are bivalves that bore clay and peat exposures. The survey work is largely a trial to determine the best means by which to record the extent of the exposures as well as the populations of piddocks. Sand levels are found to change over time, seasonally, annually and as a result of one off weather events (storms), and thus the areas of populated peat and clay also vary. A non-destructive means of assessing the piddock population is considered.

Identification

Dynodydd
Identifier
NRW_DS102035
Teitl Amgen
Alternative Title
  • 2004 CCW / IECS Carmarthen Bay and Estuaries SAC piddocks in clay/peat monitoring (MRCCW30200000013)
Laith Metadata
Metadata Language
English
Lineage

Two sites the Carmarthen Bay SAC, where piddocks had previously been mapped, were chosen; Marros Sands, near Pendine and Whiteford Point. Surveys were carried out 3 hours either side of low water and involved sampling points at 10 m intervals along transect lines chosen to correspond with specific northing lines across the peat and clay exposures. At each sampling point a GPS coordinate and photograph was taken and a 25 cm x 25 cm transect was used to record the following information: Slope of the quadrat, number of live and dead piddocks within the burrows, mussel spat or seed on the surface, cover of Enteromorpha sp, fucoids and associated faunal species (a way of assessing overall habitat quality), description of substratum. Piddocks had previously been mapped on the north Gower coast during Phase 1 survey.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2009-01-31

Temporal Extent

Begin date
2004-09-15
End date
2004-09-17
 
Categori pwnc
Topic category
  • Biota
    Biota
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=/
Cychwynnwr
Originator
  Hull University. Institute Of Estuarine And Coastal Studies -
The University of Hull, Cottingham Road, Hull, HU6 7RX
http://www.hull.ac.uk/iecs/
 

Extent

Extent

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


 

Vertical Extent

Medin Extent Keyword

benthic boundary layer
 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Database ( Marine Recorder Online - Version 2.09.02 )

    Specification

    Marine Recorder

 

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

Two sites the Carmarthen Bay SAC, where piddocks had previously been mapped, were chosen; Marros Sands, near Pendine and Whiteford Point. Surveys were carried out 3 hours either side of low water and involved sampling points at 10 m intervals along transect lines chosen to correspond with specific northing lines across the peat and clay exposures. At each sampling point a GPS coordinate and photograph was taken and a 25 cm x 25 cm transect was used to record the following information: Slope of the quadrat, number of live and dead piddocks within the burrows, mussel spat or seed on the surface, cover of Enteromorpha sp, fucoids and associated faunal species (a way of assessing overall habitat quality), description of substratum. Piddocks had previously been mapped on the north Gower coast during Phase 1 survey.
 

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
  • Carmarthen Bay and Estuaries SAC
  • Marine Recorder
  • Specialised biotope Piddocks
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-10-19
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

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

Intertidal monitoring of piddocks in Carmarthen Bay and estuaries SAC in 2004
 

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.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313032303335 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Across Wales Intertidal Monitoring Survey

NRW_DS109834
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-10-20T15:13:40.536Z
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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