4f4c4942-4343-5764-6473-313135353630 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2026-03-05T10:35:08.841Z NRW 1.0 wel Latitude and Longitude (EPSG::4326) A Survey of Moorings and their Impact on Seagrass Beds at Porth Dinllaen (2012) A Survey of Moorings and their Impact on Seagrass Beds at Porth Dinllaen (2012) Arolwg Angorfeydd a'u Heffaith ar Wlau Morwellt ym Mhorth Dinllaen, 2012 Porth Dinllaen seagrass bed, Pen Llyn a'r Sarnau SAC: a survey of moorings in the outer harbour and their impact on the seagrass 2012 2013-05-07 NRW_DS115560 Porth Dinllaen has one of the largest and densest seagrass beds within Wales. As with the majority of the United Kingdom the seagrass bed at Porth Dinllaen is typified by one species, Zostera marina. The seagrass beds at Porth Dinllaen spans over 1 km in length and up to 650 m wide in places, throughout the inner and outer harbour areas. Previous work has found that boat moorings create distinct radial scour patterns within the Z. marina. As part of the management of the Pen Llyn a'r Sarnau Special Area of Conservation(SAC), the SAC Officer has been working with the National Trust, Relevant Authorities, local fishermen, boat owners and other stakeholders to look at options to reduce the impact of the moorings on Z. marina at Porth Dinllaen. In 2012 surveys were conducted within the outer harbour using volunteer SCUBA divers. The aims of the 2012 surveys were to record the mooring number and designs used within Porth Dinllaen outer harbour, and assess how these moorings relate to the density of Z. marina, adjacent Z. marina canopy height, and presence of wasting. The work was carried out under the Ecosystem Resilience and Diversity Fund. Porth Dinllaen has one of the largest and densest seagrass beds within Wales. As with the majority of the United Kingdom the seagrass bed at Porth Dinllaen is typified by one species, Zostera marina. The seagrass beds at Porth Dinllaen spans over 1 km in length and up to 650 m wide in places, throughout the inner and outer harbour areas. Previous work has found that boat moorings create distinct radial scour patterns within the Z. marina. As part of the management of the Pen Llyn a'r Sarnau Special Area of Conservation(SAC), the SAC Officer has been working with the National Trust, Relevant Authorities, local fishermen, boat owners and other stakeholders to look at options to reduce the impact of the moorings on Z. marina at Porth Dinllaen. In 2012 surveys were conducted within the outer harbour using volunteer SCUBA divers. The aims of the 2012 surveys were to record the mooring number and designs used within Porth Dinllaen outer harbour, and assess how these moorings relate to the density of Z. marina, adjacent Z. marina canopy height, and presence of wasting. The work was carried out under the Ecosystem Resilience and Diversity Fund. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Gwynedd Council - Cyngor Gwynedd Council Offices, Shirehall Street, Caernarfon, Gwynedd, LL55 1SH, Wales Unknown http://www.gwynedd.gov.uk Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Gwynedd Council - Cyngor Gwynedd Council Offices, Shirehall Street, Caernarfon, Gwynedd, LL55 1SH, Wales Unknown http://www.gwynedd.gov.uk Marine Ecological Solutions Ltd Marine Ecological Solutions Ltd, 41 High Street, Menai Bridge, Ynys Mon, LL59 5EF, Wales info@marine-ecosol.com http://www.marine-ecosol.co.uk Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Habitats and biotopes Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme posidoniaceae zostera Porth Dinllaen seagrasses (see also potamogetonaceae and hydrocharitaceae) Pen Llyn a'r Sarnau SAC NRW Thesaurus 2026-03-04 geonetwork.thesaurus.local.theme.converted_nrw-keywords Macroalgae and seagrass taxonomy-related counts SeaDataNet Parameter Discovery Vocabulary 2024-06-19 geonetwork.thesaurus.external.theme.rdf+xml Volunteers IPSV Subjects List 2020-11-18 geonetwork.thesaurus.external.theme.subjects This data is jointly owned by NRW and Gwynedd Council There are no access restrictions to this data. NRW may release, publish or disseminate it freely. no limitations © CNC/NRW and Gwynedd Council 2012. 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 the copyright of NRW/Gwynedd Council 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. Contains Natural Resources Wales information © Natural Resources Wales and Database Right and contains Cyngor Gwynedd information © Cyngor Gwynedd and Database Right. All rights Reserved. Open Government Licence English biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 benthic boundary layer GWYNEDD - GWYNEDD -4.7874 -3.4258 52.5194 53.3586 2013-08-26 2013-10-15 -3 -12 Geographic Information System [A] Data is stored as .xls and ESRI.shp file format, images available as .jpg 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 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false Data was collected using volunteer SCUBA divers. The project relates to work carried out on the site within the same year to look at the sediment infauna and granulometry. Data was collected using volunteer SCUBA divers. The project relates to work carried out on the site within the same year to look at the sediment infauna and granulometry.