Carmarthen Bay Intertidal Attributes and Monitoring Techniques - Monitoring of Piddocks
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.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS102035
- Teitl Amgen
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- 2004 CCW / IECS Carmarthen Bay and Estuaries SAC piddocks in clay/peat monitoring MRCCW30200000013
- Technegau Monitro a Phriodoleddau Rhynglanwol Bae Caerfyrddin - Monitro Pidogau
- Laith Metadata
- English
- Datganiad
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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)
- 2009-01-31
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
))
Maint Fertigol
- Maint allweddair MEDIN
- benthic boundary layer
Dosbarthiad
- Fformat - Math a Disgrifiad
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Database
()
- Math
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[A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version. [B] MapInfo GIS layer in MapInfo Native format (Tables): - Position of the boundaries of the piddock habitat at Marros Sands and Whiteford Point. - Position of the transects and sample stations at Marros Sands and Whiteford Point. - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets with transect physical and species data at Marros Sands and Whiteford Point. [D] Photographs of the sites, transect points and quadrats. [E] Marine Recorder file: MRCCW30200000013
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Database
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
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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.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
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- Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
- bivalve molluscs
- lamellibranchia (pelecypoda) (bivalvia)
- Carmarthen Bay
- Special Area of Conservation Monitoring
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
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- Shellfish abundance and biomass in water bodies
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
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Intertidal monitoring of piddocks in Carmarthen Bay and estuaries SAC in 2004
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
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There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
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© CNC/NRW 2009. There are no use restrictions on this data. Recipients may re-use, reproduce, disseminate this data free of charge in any format or medium, provided they do so accurately, acknowledging both the source and NRW's copyright, and do not use it in a misleading context. It is the recipient's responsibility to ensure the data is fit for the intended purpose, that dissemination or publishing does not result in duplication, and that it is fairly interpreted. Advice on interpretation should be sought where required. To avoid re-using old data, users should periodically obtain the latest version from the original source.
Metadata
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313032303335 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-12-09T12:37:35.612Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
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