NRW_DS110464 eng NRW_DS116511 dataset Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en pointOfContact 2026-03-03T16:06:52 MEDIN 3.1.2 wel eng utf8 British National Grid (EPSG::27700) Cemlyn Lagoon Soft Sediment Infauna Survey (2006 - 2012) Cemlyn Lagoon Soft Sediment Infauna Survey (2006 - 2012) Arolwg o isfilod gwaddodion meddal Lagwn Cemlyn 2006-11 CCW Cemlyn Lagoon survey MRCCW30000000042 2012 DRAFT CCW Cemlyn Lagoon Survey MRCCW30000000076 2006 - 09 CCW Cemlyn Lagoon survey 2012-12-31 publication 4f4c4942-4343-5764-6473-313130343634 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. 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. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en owner Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en custodian CCW Marine Monitoring Team Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ originator Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en distributor annually Species distribution theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Temperature marine monitoring (see also marine surveys) salinity sediment sample benthic communities lagoons benthic species marine sediments (coastal sediments) (intertidal sediments) (subtidal sediments) sediment infauna theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords Zoobenthos generic abundance Salinity of the water column Temperature of the water column theme SeaDataNet Parameter Discovery Vocabulary 2024-06-19 publication geonetwork.thesaurus.external.theme.rdf+xml otherRestrictions There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations otherRestrictions © 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. vector eng utf8 oceans biota NRW Geographic Identifiers Collection 2024-01-01 publication SIR YNYS MON - ISLE OF ANGLESEY -4.5177917 -4.4978824 53.40322226 53.41544536 SeaVoX Vertical Co-ordinate Coverages 2013-02-05 creation soil and sediment boundary layer 2006-03-01 2012-12-31 0 -1.63 Database [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. dataset 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 2010-12-08 publication This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false 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. 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.