Cockle and Mussel Stock (bird food) Surveys in the Dee, Traeth Lafan and Burry Inlet 2004
Arolygon ar Gocos a Misglod (bwyd adar) yn Afon Dyfrdwy, Traeth Lafan a Porth Tywyn, 2004

  • English
  • wel
  • All

Special Protection Areas (SPAs) are strictly protected sites classified in accordance with Article 4 of the EC Birds Directive. They are classified for rare and vulnerable birds (as listed on Annex I of the Directive), and for regularly occurring migratory species. The Dee Estuary, Traeth Lafan and Burry Inlet SPA support nationally and internationally important populations of wildfowl and waders as well as important cockle fisheries. The removal of cockles and the associated disturbance caused by fishing them needs to be balanced with bird food requirements. The aim of the project is to assess the food requirements of wading birds, such as oystercatcher and knot that over-winter in these areas in order to set monitoring targets and to assess the implications of cockle and mussel fishing scenarios to the bird populations. The purpose of this data capture was to provide data on stock abundance and distribution across the whole of the survey areas. The data collected and its results will primarily be used for site monitoring and also for casework. Longer term work on the Burry Inlet may combine this data with data gathered on bird foraging behaviour, together with site specific data on bird numbers and used in an individual behaviour based model to predict the food requirements of a bird population.

Identification

Dynodydd
Identifier
NRW_DS109749
Laith Metadata
Metadata Language
English
Lineage

The 2004 cockle and mussel survey was contracted to Aquatic Survey and Monitoring Ltd., who sub-contracted individuals to make up the survey teams in North Wales and South Wales. Three areas were surveyed - the Dee Estuary, Traeth Lafan and the Burry Inlet. Over 400 cockle survey stations (on a grid system) were surveyed in each area, using GPS, 0.1m2 quadrats and a sieve of 2 mm mesh. Cockles retained in the sieve were measured and counted; enabling the production of cockle density maps and estimates of the total cockle populations of each area. Mussel beds in each survey area were also surveyed in a similar way, and all mussels over 10 mm length in each 0.1m2 quadrat were measured and counted. This enabled the estimation of the total mussel populations of each bed. The full analysis of the data will be the subject of a later report in CCWs Marine Monitoring Report Series (West et al. 2004). All data was collected by staff with a background in Biological Sciences using rigid rules laid out in the report methodology. All data entry was subject to auto-validation and conditional formatting. A copy of the data was checked regularly by the project manager for errors. The data was put through a rigorous series of verification procedures to ensure that there were no inconsistencies between the field records, the shellfish measurements and the sub-sample records. The field notebooks and recording sheets were also supplied to the project manager and numerous records were checked for accuracy of the data entry.
Additional Information

All data is published in the CCW Marine Monitoring Report no. 16.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2004-11-30

Temporal Extent

Begin date
2004-08-01
End date
2004-09-30
 
Categori pwnc
Topic category
  • Environment
    Environment
  • Biota
    Biota
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Coastal Assessment Liaison and Monitoring (CALM) -
Ti Cara, Point Lane, Cosheston, Pembrokeshire, SA72 4UN, Wales
<!--No website -->
Cychwynnwr
Originator
  Various contractors -
See Natural Resources Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
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


 

Vertical Extent

Medin Extent Keyword

benthic boundary layer
 
 

Distribution

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

    Specification

    [A] Maps of cockle and mussel sampling stations (Digital point data and hard copy maps in report) [B] Maps of Cockle and mussel areas (Digital polygon maps and hard copy maps in report) [C] Raw data held in MS Excel and MapInfo [D] Report - electronic

 

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

The 2004 cockle and mussel survey was contracted to Aquatic Survey and Monitoring Ltd., who sub-contracted individuals to make up the survey teams in North Wales and South Wales. Three areas were surveyed - the Dee Estuary, Traeth Lafan and the Burry Inlet. Over 400 cockle survey stations (on a grid system) were surveyed in each area, using GPS, 0.1m2 quadrats and a sieve of 2 mm mesh. Cockles retained in the sieve were measured and counted; enabling the production of cockle density maps and estimates of the total cockle populations of each area. Mussel beds in each survey area were also surveyed in a similar way, and all mussels over 10 mm length in each 0.1m2 quadrat were measured and counted. This enabled the estimation of the total mussel populations of each bed. The full analysis of the data will be the subject of a later report in CCWs Marine Monitoring Report Series (West et al. 2004). All data was collected by staff with a background in Biological Sciences using rigid rules laid out in the report methodology. All data entry was subject to auto-validation and conditional formatting. A copy of the data was checked regularly by the project manager for errors. The data was put through a rigorous series of verification procedures to ensure that there were no inconsistencies between the field records, the shellfish measurements and the sub-sample records. The field notebooks and recording sheets were also supplied to the project manager and numerous records were checked for accuracy of the data entry.
 

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
  • food stock
  • Lafan sands (Lavan sands)(Traeth Lafan)
  • cockles
  • cerastoderma edule (previously known as cardium edule)
  • mussels
  • Burry Inlet
  • waders (see also specific species)
  • unionidae
  • Special Protection Areas (SPAs) (see also proposed Special Protection Area pSPA)
  • Dee estuary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2026-08-27
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

Surveys of cockle and mussel stocks in the Dee, Traeth Lafan and Burry Inlet
 

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 2004. 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
File Identifier
4f4c4942-4343-5764-6473-313039373439 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Cockle and Mussel Stock (bird food) Surveys in the Burry Inlet 2005-2009

NRW_DS108873
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-09-28T11:08:08.33Z
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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