NRW_DS102004 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 2026-03-03T12:28:12 MEDIN 3.1.2 wel eng utf8 British National Grid (EPSG::27700) Intertidal Monitoring of Hydroid-dominated Rockpools in Carmarthen Bay and Estuaries Special Areas of Conservation (SAC) 2004 Intertidal Monitoring of Hydroid-dominated Rockpools in Carmarthen Bay and Estuaries Special Areas of Conservation (SAC) 2004 2004 CCW / IECS Carmarthen Bay & Estuaries SAC LR.H transects Survey MRCCW31600000007 2004 CCW / IECS Carmarthen Bay and Estuaries SAC hydroid rockpool (LR.H) richness monitoring MRCCW30200000017 Monitro Rhynglanwol: Pyllau Glan Mor Hydroidau yn ACA Bae Caerfyrddin ac Aberoedd (2004) 2008-12-31 publication 4f4c4942-4343-5764-6473-313032303034 Hydroid rockpools (LR.H) are, by definition, species poor in comparison to other rockpool biotopes within the UK. LR.H rockpools are shallow mixed substrata pools characterised by the hydroids Obelia longissima and Kirchenpaueria pinnata, ephemeral seaweeds such as Ulva sp. and Enteromorpha spp. and the common periwinkle Littorina littorea. The casts of the lugworm Arenicola marina and the sand mason worm Lanice conchilega can be found in sandier pools. Hydroid rockpools are also associated with mussel beds (SLR.MytX), with Mytilus edulis present in the pools. Barnacles (Semibalanus balanoides and Elminius modestus) and the keel worm Pomatoceros sp. may also be attached to the harder substrata. On the south side of the Burry Inlet, hydroid rockpools have been identified at Whiteford Point during Phase 1 biotope surveys carried out by the Countryside Council for Wales (CCW) in 2000. The rockpools are located at the tip of Whiteford Point, within the vicinity of a cast iron Victorian lighthouse, currently listed as an ancient monument. The purpose of this data capture was to map and assess the current extent and distribution of Hydroid rockpools within the Special Area of Conservation (SAC) and evaluate the possible ephemeral nature of Hydroid rockpools by assessing the species richness of the rockpools at Whiteford Point. Hydroid rockpools (LR.H) are, by definition, species poor in comparison to other rockpool biotopes within the UK. LR.H rockpools are shallow mixed substrata pools characterised by the hydroids Obelia longissima and Kirchenpaueria pinnata, ephemeral seaweeds such as Ulva sp. and Enteromorpha spp. and the common periwinkle Littorina littorea. The casts of the lugworm Arenicola marina and the sand mason worm Lanice conchilega can be found in sandier pools. Hydroid rockpools are also associated with mussel beds (SLR.MytX), with Mytilus edulis present in the pools. Barnacles (Semibalanus balanoides and Elminius modestus) and the keel worm Pomatoceros sp. may also be attached to the harder substrata. On the south side of the Burry Inlet, hydroid rockpools have been identified at Whiteford Point during Phase 1 biotope surveys carried out by the Countryside Council for Wales (CCW) in 2000. The rockpools are located at the tip of Whiteford Point, within the vicinity of a cast iron Victorian lighthouse, currently listed as an ancient monument. The purpose of this data capture was to map and assess the current extent and distribution of Hydroid rockpools within the Special Area of Conservation (SAC) and evaluate the possible ephemeral nature of Hydroid rockpools by assessing the species richness of the rockpools at Whiteford Point. 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 Species distribution Habitats and biotopes theme GEMET - INSPIRE themes, version 1.0 2008-06-01 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Whiteford Point Special Areas of Conservation (SAC) - SAC monitoring marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore) rockpools Carmarthen Bay Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC) hydroids theme NRW Thesaurus 2025-01-08 publication geonetwork.thesaurus.local.theme.converted_nrw-keywords Zoobenthos taxonomic abundance Habitat characterisation 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 SIR GAERFYRDDIN - CARMARTHENSHIRE NRW Geographic Identifiers Collection 2024-01-01 publication Wales (WLS) -4.259212863 -4.240809687 51.64085202 51.66045164 2004-09-16 2004-09-17 Teams consisted of 2 experienced intertidal surveyors each, providing reasonable confidence in taxonomic identification. GPS position accuracy is expected to be +/- 5 m. In 2012 the species data entered into Marine Recorder was re-structured to meet standard formats. Work carried out under contract to CALM. 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): - Position of the transects and quadrats at Whiteford Point. - Rockpool outlines at Whiteford Point - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets with quadrat physical and species data. [D] Photographs of the quadrat points and rockpools. [E] Marine Recorder file:MRCCW30200000017, MRCCW31600000007 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 The study of hydroid-dominated rockpools on a low-lying area of intertidal proved very difficult due to the variable nature of the substratum and of the areas of standing water. This report provides a reference against which the future condition of the pools can be monitored and also identifies some of the more effective means of recording the habitat and associated species. Surveys were carried out by a team of 5 surveyors working three hours either side of low water. Extent and distribution: A grid format of sample points was surveyed along lines of eastings and northings over the area of rockpools. Sample points were taken every 100m along transects. At each sample point a GPS coordinate and photograph was taken. Physical characteristics (percent sand cover, percent cover of hard substratum and percent cover of standing water) and key species of flora and fauna were recorded within the 4m2 survey area. Species diversity: A GPS point and photograph were taken for each rockpool and the boundaries of distinct rockpools were mapped using a differential GPS. Characteristics of the pool (dimension, location, distinguishing features) were noted and species present recorded. Additional underboulder species were checked for by turning over at least ten rocks. A note was made of time spent compiling the species list.Teams consisted of 2 experienced intertidal surveyors each, providing reasonable confidence in taxonomic identification. GPS position is expected to be +/- 5 m. In 2012 the species data entered into Marine Recorder was re-structured to meet standard formats. Work carried out under contract to CALM. Hydroid rockpools have been identified at Whiteford Point during Phase 1 biotope surveys carried out by CCW in 2000. As part of the ongoing monitoring program for CCW, IECS were commissioned to carry out further monitoring at this key site. The study of hydroid-dominated rockpools on a low-lying area of intertidal proved very difficult due to the variable nature of the substratum and of the areas of standing water. This report provides a reference against which the future condition of the pools can be monitored and also identifies some of the more effective means of recording the habitat and associated species. Surveys were carried out by a team of 5 surveyors working three hours either side of low water. Extent and distribution: A grid format of sample points was surveyed along lines of eastings and northings over the area of rockpools. Sample points were taken every 100m along transects. At each sample point a GPS coordinate and photograph was taken. Physical characteristics (percent sand cover, percent cover of hard substratum and percent cover of standing water) and key species of flora and fauna were recorded within the 4m2 survey area. Species diversity: A GPS point and photograph were taken for each rockpool and the boundaries of distinct rockpools were mapped using a differential GPS. Characteristics of the pool (dimension, location, distinguishing features) were noted and species present recorded. Additional underboulder species were checked for by turning over at least ten rocks. A note was made of time spent compiling the species list.Teams consisted of 2 experienced intertidal surveyors each, providing reasonable confidence in taxonomic identification. GPS position is expected to be +/- 5 m. In 2012 the species data entered into Marine Recorder was re-structured to meet standard formats. Work carried out under contract to CALM. Hydroid rockpools have been identified at Whiteford Point during Phase 1 biotope surveys carried out by CCW in 2000. As part of the ongoing monitoring program for CCW, IECS were commissioned to carry out further monitoring at this key site.