NRW_DS101896 eng NRW_DS114501 dataset Data Services Team Natural Resources Wales (NRW), Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW enquiries@naturalresourceswales.gov.uk http://naturalresourceswales.gov.uk/splash?orig=/ pointOfContact 2026-03-03T12:01:10 MEDIN 3.1.2 wel eng utf8 British National Grid (EPSG::27700) Intertidal Monitoring of Muddy gravels (LMX.Psyllid) in Menai Strait and Conwy Bay Special Area of Conservation (SAC) 2004 Intertidal Monitoring of Muddy gravels (LMX.Psyllid) in Menai Strait and Conwy Bay Special Area of Conservation (SAC) 2004 2004 CCW / IECS Menai Strait and Conwy Bay SAC muddy gravel (LMX) epibiota monitoring MRCCW30200000007 2004 CCW / IECS Menai Strait and Conwy Bay SAC muddy gravel (LMX) core sampling MRCCW30200000009 Monitro rhynglanwol graean lleidiog (LMX.Psyllid) yn ACA Y Fenai a Bae Conwy 2004 2004-12-31 publication 4f4c4942-4343-5764-6473-313031383936 Muddy gravels consist of shores of mixed sediments ranging from muds with gravel and sand components to mixed sediments with pebbles, gravels, sands and mud in even proportions. Mixed sediments which are predominantly muddy tend to support infauna similar to mud and sandy mud shores. Although sheltered muddy gravel habitats occur principally in estuaries, rias and sea lochs in areas protected from wave action and strong tidal streams, the environmental conditions of the Menai Strait are unusual, in that the water is relatively turbid and although the area is largely sheltered from wave action it experiences extremely strong tidal currents, reaching up to 8 knots in places during spring tides. The muddy gravel LMX.Psyllid biotope has been mapped along the west side of the Menai Straits, with the mixed sediment shores between Beaumaris and Lleiniog being highly productive, rich in animal and plant species. The muddy gravel LMX.Psyllid contains an unusually high number of syllid polychaetes and form a nationally important biotope, uncommon within the UK. The aim of this data capture was to identify the boundary of muddy gravel and muddy gravel with canopy of tideswept Fucus serratus. - To determine what exactly constitutes the boundary of muddy gravel - To measure the extent of the muddy gravel biotope - To determine a physical damage index for muddy gravels - To take samples at old and recently impacted areas of muddy gravel. - To characterise the infaunal community and identify the degree and type of change using previous data. Muddy gravels consist of shores of mixed sediments ranging from muds with gravel and sand components to mixed sediments with pebbles, gravels, sands and mud in even proportions. Mixed sediments which are predominantly muddy tend to support infauna similar to mud and sandy mud shores. Although sheltered muddy gravel habitats occur principally in estuaries, rias and sea lochs in areas protected from wave action and strong tidal streams, the environmental conditions of the Menai Strait are unusual, in that the water is relatively turbid and although the area is largely sheltered from wave action it experiences extremely strong tidal currents, reaching up to 8 knots in places during spring tides. The muddy gravel LMX.Psyllid biotope has been mapped along the west side of the Menai Straits, with the mixed sediment shores between Beaumaris and Lleiniog being highly productive, rich in animal and plant species. The muddy gravel LMX.Psyllid contains an unusually high number of syllid polychaetes and form a nationally important biotope, uncommon within the UK. The aim of this data capture was to identify the boundary of muddy gravel and muddy gravel with canopy of tideswept Fucus serratus. - To determine what exactly constitutes the boundary of muddy gravel - To measure the extent of the muddy gravel biotope - To determine a physical damage index for muddy gravels - To take samples at old and recently impacted areas of muddy gravel. - To characterise the infaunal community and identify the degree and type of change using previous data. 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 Institute of Estuarine and Coastal Studies University of Hull, Hull, East Yorkshire, 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 marine surveys (intertidal & subtidal surveys) (littoral survey) (sublittoral surveys) (bathymetric survey) (see also marine monitoring and MNCR) sediment infauna monitoring (see specific types of monitoring eg. woodland monitoring) marine sediments (coastal sediments) (intertidal sediments) (subtidal sediments) Menai Strait and Conwy Bay cSAC theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords 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. CCW may release, publish or disseminate it freely. no limitations otherRestrictions © CCGC/CCW 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 CCW'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) -4.1588367 -3.84514475 53.19418232 53.35933154 2002-08-01 2004-08-03 Documents [A] Data is held within Excel spreadsheets [B] Spatial TAB Files. [C] Jpeg Images of quadrats and sites [D] Data within Marine Recorder: MRCCW30200000009 / MRCCW30200000007 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 Marine mud and muddy gravel habitats had previously been sampled by Barnes (2003) and CCW in August 2002. The survey was undertaken two hours either side of low water on a good spring tide with transects walked from high to low water, perpendicular to the shore along a bearing. At each sample point (sample station) GPS readings were noted. Information recorded included photograph of sediment surface, sediment type, species found on surface, % cover of fucoids, photograph of profile dug in sediment, species found in profile and infauna detectable by sieving. Sample points were spaced at 25m intervals and sufficient regular transects were sampled to ensure that extent and distribution were described. Survey dates- 02/08/04-03/08/04, historic data was also used from 2002. Marine mud and muddy gravel habitats had previously been sampled by Barnes (2003) and CCW in August 2002. The survey was undertaken two hours either side of low water on a good spring tide with transects walked from high to low water, perpendicular to the shore along a bearing. At each sample point (sample station) GPS readings were noted. Information recorded included photograph of sediment surface, sediment type, species found on surface, % cover of fucoids, photograph of profile dug in sediment, species found in profile and infauna detectable by sieving. Sample points were spaced at 25m intervals and sufficient regular transects were sampled to ensure that extent and distribution were described. Survey dates- 02/08/04-03/08/04, historic data was also used from 2002.