Cockle and Mussel Stock (Bird Food) Surveys in the Burry Inlet 2011

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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 Burry Inlet Special Protection Area (SPA) supports nationally and internationally important populations of wildfowl and waders. It also supports an important cockle fishery. 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 that over-winter in the Burry Inlet Special Protection Areas (SPAs). Data Collection is repeated annually. The purpose of this data capture was to provide data on stock abundance and distribution across the whole of the Burry Inlet. The data collected and its results will primarily be used for site monitoring and also for casework. In the future this data may be combined 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_DS114765
Teitl Amgen
Alternative Title
  • Arolygon ar Gocos a Misglod (bwyd adar) ym Mhorth Tywyn o 2011
Laith Metadata
Metadata Language
English
Lineage

Approximately 400 cockle survey stations (on a grid system) surveyed, 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 the Inlet 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. All data entry was subject to auto-validation and conditional formatting. Data was also checked 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. Samples of the shellfish were analysed to measure wet weight, ash free dry weight and shell length; providing sufficient data to determine length: weight relationships and thereby calculate estimates of total weight of shellfish in the Inlet. In addition to the whole Inlet grid of cockle surveys stations (with 250m spacing) a trial was carried out in 2011 to assess the benefits of closer spacing between the stations. A grid of 49 stations with 100 m spacing was sampled, using the standard sampling methodology, in a sub-area of the north Inlet bed. The methodology for the data collection is based on West et al. (2004). The dataset builds on work initiated in 2004 as part of a wider assessment of Cockle and Mussel Stocks across three sites in Wales (The Dee Estuary, Traeth Lafan, Gwynedd and the Burry Inlet. Repeat surveys in the Burry were then carried out annually at the same time of year (Sept/Oct) between 2005 and 2009). There was no survey in 2010.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2011-04-30
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 -->
 

Extent

Extent

Hyd
Geographic Extent
SIR GAERFYRDDIN - CARMARTHENSHIRE
Hyd
Geographic Extent
ABERTAWE - SWANSEA
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] Raw data held in MS Excel and MapInfo [B] Summary statistics and calculations held in MS Excel [C] Report - MS Word and pdf

 

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
Degree
false
Lineage

Approximately 400 cockle survey stations (on a grid system) surveyed, 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 the Inlet 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. All data entry was subject to auto-validation and conditional formatting. Data was also checked 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. Samples of the shellfish were analysed to measure wet weight, ash free dry weight and shell length; providing sufficient data to determine length: weight relationships and thereby calculate estimates of total weight of shellfish in the Inlet. In addition to the whole Inlet grid of cockle surveys stations (with 250m spacing) a trial was carried out in 2011 to assess the benefits of closer spacing between the stations. A grid of 49 stations with 100 m spacing was sampled, using the standard sampling methodology, in a sub-area of the north Inlet bed. The methodology for the data collection is based on West et al. (2004). The dataset builds on work initiated in 2004 as part of a wider assessment of Cockle and Mussel Stocks across three sites in Wales (The Dee Estuary, Traeth Lafan, Gwynedd and the Burry Inlet. Repeat surveys in the Burry were then carried out annually at the same time of year (Sept/Oct) between 2005 and 2009). There was no survey in 2010.
 

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
  • cockle beds
  • cockle fishery
  • cockles
  • cerastoderma edule (previously known as cardium edule)
  • mussel beds
  • mussel crumble
  • mussels
  • unionidae
  • waders (see also specific species)
  • oystercatchers
  • haematopus ostralegus
  • Knot
  • Burry Inlet
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
  • Shellfish morphology, age and physiology
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Adolygu)
Date (Revision)
2021-01-06
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

Burry Inlet cockle mortalities investigation 2009 - 2011
NRW Related Title

A survey of the cockle stocks in the Burry Inlet, South Wales
NRW Related Title

A survey of the cockle stocks in the Burry Inlet, South Wales
NRW Related Title

A survey of the cockle stocks in the Burry Inlet, South Wales
NRW Related Title

Surveys of cockle and mussel stocks in the Burry Inlet 2004 to 2008
NRW Related Title

Surveys of cockle and mussel stocks in the Burry Inlet 2009
NRW Related Title

Surveys of cockle and mussel stocks in the Burry Inlet 2011
 

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 2011. 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
4f4c4942-4343-5764-6473-313134373635 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
2024-05-31T09:38:30.279Z
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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