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.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS102008
- Teitl Amgen
-
- 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
- Laith Metadata
- English
- Datganiad
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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.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2008-12-31
Ystod amser
- Dyddiad cychwyn
- 2004-07-05
- Dyddiad gorffen
- 2005-08-10
- Categori pwnc
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- Biota
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
))
Maint Fertigol
- Maint allweddair MEDIN
- benthic boundary layer
Dosbarthiad
- Fformat - Math a Disgrifiad
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Documents
()
- Math
-
[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
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Documents
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
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.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- 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
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
-
- Zoobenthos taxonomy-related counts
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
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Intertidal monitoring of sabellaria alveolata reefs in Pen Llyn a'r Sarnau SAC 2004/5
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
-
There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
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© 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
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313032303038 XML
- Laith Metadata
- English
- Dynodydd Rhiant
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Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-12-09T12:33:38.847Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0