4f4c4942-4343-5764-6473-313032303335
eng
dataset
Natural Resources Wales (NRW)
0300 065 3000
Maes-y-Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
pointOfContact
2018-07-03
MEDIN Discovery Metadata Standard
Version 2.3.8
urn:ogc:def:crs:EPSG::BNG
OGP
Carmarthen Bay Intertidal Attributes and Monitoring Techniques - Monitoring of Piddocks
Technegau Monitro a Phriodoleddau Rhynglanwol Bae Caerfyrddin - Monitro Pidogau
2004 CCW / IECS Carmarthen Bay and Estuaries SAC piddocks in clay/peat monitoring MRCCW30200000013
2009-01-31
publication
2009-01-31
revision
102035
https://naturalresources.wales
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 o
f 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.
Natural Resources Wales (NRW)
0300 065 3000
Maes-y-Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
custodian
Countryside Council for Wales (CCW)
0300 065 3000
Countryside Council for Wales
Maes y Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
originator
Hull University. Institute Of Estuarine And Coastal Studies
01482 464120
The University of Hull
HU6 7RX
iecs@hull.ac.uk
originator
notPlanned
Database
Species distribution
GEMET - INSPIRE themes, version 1.0
2022-02-05
publication
Shellfish abundance and biomass in water bodies
SeaDataNet Parameter Discovery Vocabulary
2011-03-25
publication
Marine Environmental Data and Information Network
© 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.
otherRestrictions
There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
10
eng
biota
ISO3166 Countries
2022-02-05
publication
Wales (WLS)
SeaVoX Vertical Co-ordinate Coverages
2010-05-18
publication
benthic boundary layer
-4.661367103
-4.166842442
51.59887176
51.82849207
2004-09-15
2004-09-17
Natural Resources Wales (NRW)
0300 065 3000
Maes-y-Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
distributor
dataset
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 map
ped on the north Gower coast during Phase 1 survey.