NRW_DS102011 eng NRW_DS109834 dataset Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en pointOfContact 2026-03-03T14:33:51 MEDIN 3.1.2 wel eng utf8 British National Grid (EPSG::27700) Intertidal Monitoring of Muddy Gravel Community (IMX.VsenMtru) in the Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2004 Intertidal Monitoring of Muddy Gravel Community (IMX.VsenMtru) in the Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2004 2004 CCW / IECS Pen Llyn a'r Sarnau SAC muddy gravel community (IMX.VsenMtru) monitoring MRCCW3030000000B Monitro Cymuned Graean Lleidiog (IMX.VsenMtru) rhynglanwol yn ACA Pen Llyn a'r Sarnau yn 2004 2008-12-31 publication 4f4c4942-4343-5764-6473-313032303131 The results of monitoring the extent and species richness of a distinct area of mixed sediment that lies east of Llanbedrog beach. The muddy gravel community is - IMX.VsenMtru (Venerupis senegalensis and Mya truncata in lower shore or infralittoral muddy gravel), and has a high biodiversity of epifauna, flora and infauna, due to the admixture of cobbles, pebbles, gravel, sand and mud. This provides many different habitat niches. The habitat is located within the Pen Llyn a'r Sarnau Special Area of Conservation (SAC) on the lower shore at Llanbedrog. In fully marine conditions on the lower shore, this habitat can be particularly species rich due to the complex nature of the substratum supporting a high diversity of infauna and epifauna, however many factors affect the habitat, physical disturbance, bait digging, organic enrichment, introduction of non-native species etc. The purpose of this data capture was to map the current extent of muddy gravel, define the character of the muddy gravel for in situ recognition, identify current known species composition and identify location for representative core sampling and Particle Size Analysis. The results of monitoring the extent and species richness of a distinct area of mixed sediment that lies east of Llanbedrog beach. The muddy gravel community is - IMX.VsenMtru (Venerupis senegalensis and Mya truncata in lower shore or infralittoral muddy gravel), and has a high biodiversity of epifauna, flora and infauna, due to the admixture of cobbles, pebbles, gravel, sand and mud. This provides many different habitat niches. The habitat is located within the Pen Llyn a'r Sarnau Special Area of Conservation (SAC) on the lower shore at Llanbedrog. In fully marine conditions on the lower shore, this habitat can be particularly species rich due to the complex nature of the substratum supporting a high diversity of infauna and epifauna, however many factors affect the habitat, physical disturbance, bait digging, organic enrichment, introduction of non-native species etc. The purpose of this data capture was to map the current extent of muddy gravel, define the character of the muddy gravel for in situ recognition, identify current known species composition and identify location for representative core sampling and Particle Size Analysis. 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 Countryside Council for Wales (CCW) Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ originator Hull University. Institute Of Estuarine And Coastal Studies The University of Hull, Cottingham Road, Hull, HU6 7RX iecs@hull.ac.uk http://www.hull.ac.uk/iecs/ originator Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en distributor notPlanned Habitats and biotopes theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Special Areas of Conservation (SAC) - SAC monitoring Pen Llyn a'r Sarnau SAC mixed substrata muddy gravel Llanbedrog marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore) theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords Seabed photography Habitat characterisation Habitat extent 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 biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 revision benthic boundary layer NRW Geographic Identifiers Collection 2024-01-01 publication Wales (WLS) -4.476854926 -4.465002212 52.85471557 52.8631457 2004-07-07 2005-01-31 Documents [A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version [B] MapInfo GIS layer in MapInfo Native format (Tables): - Polygon defining the boundary of the muddy gravel habitat - Location of the sediment coring station - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets of sediment particle size analysis and infauna data. [D] Photographs of the muddy gravel habitat. [E] Marine Recorder file: MRCCW3030000000B 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 Survey conducted on foot, working 2 hours either side of low water. The survey team identified and recorded species in situ where possible, samples were taken of any species that could not be immediately identified in the field for further analysis by experienced IECS benthic staff. Representative photos of the habitat were taken throughout the survey. A suitable location (representative of the overall nature of the biotope) was identified, and the position recorded for comparability of future surveys. At this five replicate core samples, each 10 cm diameter (0.0078 m2), and one sample for PSA were taken to establish infaunal biomass and sediment characteristics (January 2005). Distribution of IMX.VsenMtru previously mapped in the area during Phase 1 survey carried out by CCW in 1996.The extent of muddy gravel was mapped by walking around the biotope perimeter recording the boundary position with a portable dGPS. Notes were recorded in situ with respect to sediment characteristics and features of the biotope. Infaunal sample does not coincide with epibiota records. Epibiota recording of moderate confidence. Positional accuaracy of 1-5 m. Survey conducted on foot, working 2 hours either side of low water. The survey team identified and recorded species in situ where possible, samples were taken of any species that could not be immediately identified in the field for further analysis by experienced IECS benthic staff. Representative photos of the habitat were taken throughout the survey. A suitable location (representative of the overall nature of the biotope) was identified, and the position recorded for comparability of future surveys. At this five replicate core samples, each 10 cm diameter (0.0078 m2), and one sample for PSA were taken to establish infaunal biomass and sediment characteristics (January 2005). Distribution of IMX.VsenMtru previously mapped in the area during Phase 1 survey carried out by CCW in 1996.The extent of muddy gravel was mapped by walking around the biotope perimeter recording the boundary position with a portable dGPS. Notes were recorded in situ with respect to sediment characteristics and features of the biotope. Infaunal sample does not coincide with epibiota records. Epibiota recording of moderate confidence. Positional accuaracy of 1-5 m.