Intertidal Monitoring of Sabellaria alveolata Reefs in Pen Llyn ar Sarnau Special Areas of Conservation (SAC) (2004/2005)

The Habitats Directive establishes that the management of Special Areas of Conservation (SACs) should aim to achieve the favourable conservation status of habitat and species features listed within its Annex I and Annex II. For SACs in Wales, the Countryside Council for Wales (CCW) is therefore required to report on a regular basis on whether features are in favourable conservation status. Honeycomb reef worm Sabellaria alveolata is a sedentary, tube-dwelling polychaete most commonly found on rocky substrata in the lower shore and shallow subtidal zones of marine and estuarine areas. The honeycomb reef worm is a UK BAP Priority Habitat (BAP habitats are now Habitats of Principal Importance/Priority Habitats). Dense congregations of S. alveolata tubes form large biogenic reef structures, which can be up to a metre thick and take the form of hummocks, sheets or more massive formations. This dataset combines the results of two monitoring events carried out on Sabellaria alveolata reef features within the Pen Llyn a'r Sarnau SAC during 2004 and 2005. In 2004 the purpose of this data capture was to identify specific survey locations, measure the extent of S. alveolata reef along agreed transects, assess the quality of S. alveolata reef present. Map and make notes on any sightings of wireweed Sargassum muticum. In 2005 the purpose of this data capture was more detailed monitoring of selected reef areas to thoroughly characterise small patches of reef and make an assessment of the impacts of anthropogenic disturbance on reef diversity.

Identifier: NRW_DS102008

Alternative Title

2004 CCW / IECS Pen Llyn a'r Sarnau SAC Sabellaria alveolata reef monitoring MRCCW30200000010
2005 CCW / IECS Pen Llyn a'r Sarnau SAC Sabellaria alveolata reefs monitoring MRCCW30200000019
Monitro Rhynglanwol: Riffiau Sabellaria alveolata yn ACA Pen Llyn a'r Sarnau 2004/2005

Metadata Language: English

Lineage: The 2004 monitoring was carried out using a revised methodology with untested field application methodology defined by Allen et al. (2002). In 2005 the four areas of S. alveolata reef within the Pen Llyn a'r Sarnau SAC intertidal area were surveyed in July and August 2004, working two hours either side of low water. Transect lines were mapped using an ORMTEC GIS412 portable dGPS, with software and logger developed specifically for this type of mapping. This system provides continuous or point logging facilities using the IRLA network, providing a temporal repeatable accuracy of between 1-5m with the data subsequently downloaded onto a PC for input into GIS. In order to achieve repeatability in survey techniques between sites, a working protocol was used. Sabellaria alveolata reef had previously been mapped along this coastline during Phase 1 surveys carried out by CCW.

Dataset Reference Date (Publication): 2008-12-31

Temporal Extent

Begin date: 2004-07-05

End date: 2005-08-10

Topic category

Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Countryside Council for Wales (CCW)

Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW

http://naturalresourceswales.gov.uk/splash?orig=/

Originator

Hull University. Institute Of Estuarine And Coastal Studies

The University of Hull, Cottingham Road, Hull, HU6 7RX

http://www.hull.ac.uk/iecs/

Extent

Geographic Extent: Wales (WLS)

Vertical Extent

Medin Extent Keyword: benthic boundary layer

Format Type and Description

Documents ()

Specification

[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): - Positions of transects for locations Borth to Clarach, Criccieth, Friog and Shell Island - 2004. - Positions of transects and quadrats for locations Cae Du, Friog, Llandanwg, Shell Island and Tonfanau - 2005. - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets for quadrat, physical and species data - 2005. [D] Photographs from each location, transect and quadrat. [E] Marine Recorder file: MRCCW30200000010, MRCCW30200000019

Data quality

Quality Scope: Dataset

Conformity: 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
Explanation
Degree: false

Lineage: The 2004 monitoring was carried out using a revised methodology with untested field application methodology defined by Allen et al. (2002). In 2005 the four areas of S. alveolata reef within the Pen Llyn a'r Sarnau SAC intertidal area were surveyed in July and August 2004, working two hours either side of low water. Transect lines were mapped using an ORMTEC GIS412 portable dGPS, with software and logger developed specifically for this type of mapping. This system provides continuous or point logging facilities using the IRLA network, providing a temporal repeatable accuracy of between 1-5m with the data subsequently downloaded onto a PC for input into GIS. In order to achieve repeatability in survey techniques between sites, a working protocol was used. Sabellaria alveolata reef had previously been mapped along this coastline during Phase 1 surveys carried out by CCW.

Keywords

GEMET - INSPIRE themes, version 1.0

Species distribution

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

Pen Llyn a'r Sarnau SAC
marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
Special Areas of Conservation (SAC) - SAC monitoring
sabellaria alveolata
polychaete worms
honeycomb worm
biogenic reef
Criccieth
Shell Island
Friog
Borth
Clarach
Tonfanau
Cae-du
Llandanwg

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary

Zoobenthos taxonomy-related counts

Type: Theme

Citation

Date (Revision): 2021-01-06

Code: geonetwork.thesaurus.external.theme.rdf+xml

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Intertidal monitoring of sabellaria alveolata reefs in Pen Llyn a'r Sarnau SAC 2004/5

Constraints

Limitations on Public Access and Use

Restriction type: Other restrictions

Access Constraints Directive

Limitations: no limitations

Access Constraints Text

Other constraints: There are no access restrictions to this data. NRW may release, publish or disseminate it freely.

Use Constraints

Use constraints type: Other restrictions

Other constraints: © 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.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313032303038 XML

Metadata Language: English

Parent Identifier: Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501

Resource type: Dataset

Metadata Date: 2024-12-09T12:33:38.847Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Publishing Body

Access the portal

Full access to the portal and metadata.

Intertidal Monitoring of Sabellaria alveolata Reefs in Pen Llyn ar Sarnau Special Areas of Conservation (SAC) (2004/2005)

Identification

Temporal Extent

Extent

Extent

Vertical Extent

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Metadata

Metadata

Publishing Body