NRW_DS110038 eng NRW_DS114501 dataset Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en pointOfContact 2026-03-03T12:51:08 MEDIN 3.1.2 wel eng utf8 British National Grid (EPSG::27700) Survey of the Tentacled Lagoon Worm (Alkmaria romijni) at Carew Castle Mill Pond (2006) Survey of the Tentacled Lagoon Worm (Alkmaria romijni) at Carew Castle Mill Pond (2006) Arolwg o fwydyn tentaclog y morlyn (Alkmaria romijni) ym Mhwll Melin Castell Caeriw 2006 CCW Survey of the tentacled lagoon worm (Alkmaria romijni) at Carew Castle Mill Pond MRCCW30000000040 2013 DRAFT CCW Carew Lagoon Survey MRCCW3000000007B 2006-11-30 publication 4f4c4942-4343-5764-6473-313130303338 The tentacled lagoon worm (Alkmaria romijni) is a nationally scarce protected species found in lagoonal habitats in the Pembrokeshire Marine Special Area of Conservation. In Wales it has only been recorded from two saline lagoon sites in Pembrokeshire: Neyland Weir Pool (Westfield Pill) and Carew Castle Mill Pond. Elsewhere in the UK it had been recorded from only a handful of sites in lagoons and estuaries along the English Channel and southern North Sea and internationally between Morocco and the Baltic where it is not uncommon. A. romijni is limited to brackish water habitats and threats to these habitats include agricultural run-off and sewage, coastal development and coastal defence as well as pollution from industrial discharges. There were three main purposes of this data capture: - To establish a repeatable baseline survey of the tentacled lagoon worm (Alkmaria romijni) at Carew Castle Mill Pond. - To undertake a spatial survey of salinity at the sediment-water interface - To note field observations on the integrity of the inflow/outflow system or any activities at the site that might be considered to have an adverse effect on the integrity of the site as a saline lagoonal habitat. The tentacled lagoon worm (Alkmaria romijni) is a nationally scarce protected species found in lagoonal habitats in the Pembrokeshire Marine Special Area of Conservation. In Wales it has only been recorded from two saline lagoon sites in Pembrokeshire: Neyland Weir Pool (Westfield Pill) and Carew Castle Mill Pond. Elsewhere in the UK it had been recorded from only a handful of sites in lagoons and estuaries along the English Channel and southern North Sea and internationally between Morocco and the Baltic where it is not uncommon. A. romijni is limited to brackish water habitats and threats to these habitats include agricultural run-off and sewage, coastal development and coastal defence as well as pollution from industrial discharges. There were three main purposes of this data capture: - To establish a repeatable baseline survey of the tentacled lagoon worm (Alkmaria romijni) at Carew Castle Mill Pond. - To undertake a spatial survey of salinity at the sediment-water interface - To note field observations on the integrity of the inflow/outflow system or any activities at the site that might be considered to have an adverse effect on the integrity of the site as a saline lagoonal habitat. 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 Aquatic Survey and Monitoring Ltd (ASML) Whitfield Brow, Bollihope, Frosterley, Weardale, Co. Durham, DL13 2SZ, England tom@aquatic-environments.co.uk http://www.marineseen.com/aquatic_survey_and_monitoring.htm 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 Species distribution theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme alkmaria romijni Carew Castle mill pond Pembrokeshire Marine SAC lagoonal lagoons tentacled lagoon worm marine and freshwater inventory theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords Zoobenthos taxonomy-related counts 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 2006 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 soil and sediment NRW Geographic Identifiers Collection 2024-01-01 publication SIR BENFRO - PEMBROKESHIRE -4.89220896 -4.77113354 51.67565958 51.73345403 2006-02-17 2006-03-15 Database [A] Digital version of contract report- Word document. [B] Survey results- Marine recorder (MRCCW30000000040 / MRCCW3000000007B) 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 Initial survey- A sampling pattern of 20 stations distributed evenly across the whole Mill Pond (stations between 45 and 80m apart), was established prior to the survey using Mapinfo GIS software. The positions derived from the GIS were input into a Garmin handheld GPS in order to enable location of the sampling stations in the field. Once sampling stations had been located , a single grab of the top 20 cm of sediment were taken using a 0.025m2 hand held Ekman grab. Once the grab arrived at the surface, a sample of the water draining out of the grab was put in a pot for later determination of the salinity at the sediment surface. The grab samples were then sieved through a 0.5 mm mesh until most of the fines had been washed away. The sieved sample was then placed in a labelled bucket and topped up with water from the Mill Pond. Samples were taken back to the laboratory. The number of Alkmaria romijni worms together with other species found in the samples were counted. The salinity of the water samples collected from the grabs determined using an Atago hand-hand refractometer. Follow up survey- a sampling technique was adopted following the principles of Adaptive Cluster Sampling (ACS), in which sampling effort is modified in response to observations made during the course of the survey. Initial survey 27 February 2006 follow up survey 15 March 2006. Initial survey- A sampling pattern of 20 stations distributed evenly across the whole Mill Pond (stations between 45 and 80m apart), was established prior to the survey using Mapinfo GIS software. The positions derived from the GIS were input into a Garmin handheld GPS in order to enable location of the sampling stations in the field. Once sampling stations had been located , a single grab of the top 20 cm of sediment were taken using a 0.025m2 hand held Ekman grab. Once the grab arrived at the surface, a sample of the water draining out of the grab was put in a pot for later determination of the salinity at the sediment surface. The grab samples were then sieved through a 0.5 mm mesh until most of the fines had been washed away. The sieved sample was then placed in a labelled bucket and topped up with water from the Mill Pond. Samples were taken back to the laboratory. The number of Alkmaria romijni worms together with other species found in the samples were counted. The salinity of the water samples collected from the grabs determined using an Atago hand-hand refractometer. Follow up survey- a sampling technique was adopted following the principles of Adaptive Cluster Sampling (ACS), in which sampling effort is modified in response to observations made during the course of the survey. Initial survey 27 February 2006 follow up survey 15 March 2006.