Cemlyn Lagoon Soft Sediment Infauna Survey (2006 - 2011)
Arolwg o isfilod gwaddodion meddal Lagwn Cemlyn

  • English
  • wel
  • All

The aim of the EC Habitats Directive 92/43/EEC is to promote the maintenance of biodiversity by requiring Member States to take measures to maintain or restore natural habitats and wild species listed on the Annexes to the Directive at a favourable conservation status, introducing robust protection for those habitats and species of European importance. Special Areas of Conservation (SACs) are strictly protected sites designated under the Habitats Directive.


In the UK coastal lagoons show a wide range of geographical and ecological variation; five main sub-types have been identified in the UK, on the basis of their physiography, as meeting the definition of the Annex I habitat type. These are graded from A to D.

- A Outstanding examples of the feature in a European context.

- B Excellent examples of the feature, significantly above the threshold for Sites of Special Scientific Interest (SSSI) notification but of somewhat lower value than grade A sites.

- C Examples of the feature which are of at least national importance (i.e. usually above the threshold for SSSI notification on terrestrial sites) but not significantly above this. These features are not the primary reason for SACs being selected.

- D Features of below SSSI quality occurring on SACs. These are non-qualifying features (“non-significant presence”), indicated by a letter D, but this is not a formal global grade.


Cemlyn lagoon on the north coast of Anglesey, north Wales, is considered to be the best example of a saline coastal lagoon in Wales (Graded A) and forms part of the Cemlyn Bay SAC. The lagoon is separated from the sea by a shingle bank with a narrow channel at the western end, across which a sluice system was built in the 1930s. Seawater exchange occurs mainly through the sluice and by percolation through the shingle bank, although in extreme storms coinciding with spring tides waves break over the top of the shingle bank. Cemlyn lagoon supports a relatively diverse set of species, several of which are specific to lagoons, including the bryozoan Conopeum seurati, the lagoon cockle Cerastoderma glaucum and the lagoonal mud-snail Ventrosia ventrosa. Cemlyn lagoon is also the only site in Wales where the lagoonal isopod Idotea chelipes has been recorded. A number of uncommon plant species are found within the lagoon, including the brackish water-crowfoot Ranunculus baudotii and beaked tasselweed Ruppia maritima. The purpose of this data capture is to aid in the monitoring and condition assessment of this Annex I feature. This dataset is a collation of data from subtidal benthic soft sediment sampling carried out within Cemlyn lagoon.

Identification

Dynodydd
Identifier
NRW_DS110464
Teitl Amgen
Alternative Title
  • 2006-11 CCW Cemlyn Lagoon survey MRCCW30000000042
  • 2006 - 09 CCW Cemlyn Lagoon survey
Laith Metadata
Metadata Language
English
Lineage

Data capture consisted of benthic invertebrates abundance records taken from samples collected using a mini-Eckman grab (0.025m2) and granulometry readings. All samples Benthic invertebrate samples are sieved over a 0.5 mm mesh. Supporting determinants consist of National Grid References (NGR), recorded using hand-help GPS; salinity and temperature readings, which are continuously recorded at site 2 using a data logger. Infaunal sampling is carried out annually in December. Salinity and temperature are recorded continuously. Benthic invertebrate samples are processed by laboratories that are members of the National Marine Biological Analytical Quality Control (NMBAQC) scheme and random samples from each survey are also selected for audit by Unicomarine.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2012-12-31

Temporal Extent

Begin date
2006-03-01
End date
2011-12-31
 
Categori pwnc
Topic category
  • Oceans
    Oceans
  • Biota
    Biota
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  CCW Marine Monitoring Team -
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
 

Extent

Extent

Hyd
Geographic Extent
SIR YNYS MON - ISLE OF ANGLESEY
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
soil and sediment boundary layer

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
0
Gwerth uchaf
Maximum value (metres)
-1.63
System Gyfeirio Cydlynu Fertigol
Vertical CRS
 
 

Distribution

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

    Specification

    [A] Sample stations (metadata) held as MapInfo GIS layers. [B] Species data and particle size analysis data are held as excel spreadsheets [C] Species data held in Marine Recorder (MRCCW30000000042). [D] Temperature and salinity reading as raw files and excel spreadsheets.

 

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

Data capture consisted of benthic invertebrates abundance records taken from samples collected using a mini-Eckman grab (0.025m2) and granulometry readings. All samples Benthic invertebrate samples are sieved over a 0.5 mm mesh. Supporting determinants consist of National Grid References (NGR), recorded using hand-help GPS; salinity and temperature readings, which are continuously recorded at site 2 using a data logger. Infaunal sampling is carried out annually in December. Salinity and temperature are recorded continuously. Benthic invertebrate samples are processed by laboratories that are members of the National Marine Biological Analytical Quality Control (NMBAQC) scheme and random samples from each survey are also selected for audit by Unicomarine.
 

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
  • marine monitoring (see also marine surveys)
  • Temperature
  • marine sediments (coastal sediments) (intertidal sediments) (subtidal sediments)
  • benthic communities
  • sediment sample
  • lagoons
  • benthic species
  • salinity
  • sediment infauna
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

 

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 2008 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
4f4c4942-4343-5764-6473-313130343634 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Macrofaunal Community Monitoring on Saline Lagoons across Wales

NRW_DS116511
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-09-28T13:56:10.837Z
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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