Intertidal Monitoring of Eelgrass (Zostera noltii) Beds in the Menai Strait and Conwy Bay Special Areas of Conservation (SACs) 2004 and 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. Seagrass beds develop in intertidal and shallow subtidal areas on sands and muds. They may be found in marine inlets and bays but also in other areas, such as lagoons and channels, which are sheltered from significant wave action. Zostera noltii generally occurs higher on the shore than the other two Zostera species found in the UK and occurs in low/variable salinity areas. Seagrass beds have important biological functions and are of conservation and economic importance; however human activity in the coastal zone (pollution, dredging boat mooring etc) can affect its distribution or even destroy the beds completely. The work expressed here is both to trial the methodology and to establish a reference condition for the eelgrass beds at Foryd Bay and Traeth Lafan in the Menai Strait and Conwy Bay SAC. The purpose of this data capture was to determine and map the extent, density and condition of Zostera noltii identified at Traeth Lafan and Foryd bay in previous years, record the presence of epiphytes and ephemeral algal species on the beds, record other conspicuous biota within the Zostera beds, record any damage or disease of the Zostera and develop and test an index of damage.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS102007
- Teitl Amgen
-
- 2005 CCW / IECS Menai Strait and Conwy Bay SAC Zostera noltii monitoring MRCCW3020000001C
- 2004 CCW / IECS Menai Strait and Conwy Bay SAC Zostera noltii monitoring MRCCW30200000008
- Monitro Rhynglanwol: Zostera noltii yn ACA Y Fenai a Bae Conwy 2004 a 2005
- Laith Metadata
- English
- Datganiad
-
Both sites were surveyed over one tide cycle working three hours either side of low water. Extent of the beds was recorded using portable dGPS to map boundaries. Sampling points at each site were chosen based on a grid system. Transect lines (Foryd Bay = 100 m apart, Traeth Lafan = 50 m apart) were chosen to correspond to specific Ordnance Survey easting lines and sampling was carried out at 25 m (Foryd Bay) or 50 m (Traeth Lafan) intervals along these transect lines. At each point GPS coordinate and photograph were taken and a 50 cm x 50 cm quadrat was used to record percentage cover of Zostera, cover of Ulva sp., description of substratum, mussel crumble and evidence of disease. Z. noltii beds were identified at Traeth Lafan and Foryd Bay during the CCW intertidal Phase 1 survey in 2001. All GPS positions are expected to be +/- 5 metre accuracy. All surveyors familiar with the attributes to be recorded during these surveys. Confidence of the accuracy of the data is high.
- Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
- 2009-01-31
Ystod amser
- Dyddiad cychwyn
- 2004-08-06
- Dyddiad gorffen
- 2005-05-30
- Categori pwnc
-
- 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] Excel Spreadsheets of data: - - MSCB Z_noltii percent covers.xls - MSCB Z_noltii Foryd Bay Zostera.xls - MSCB Z_noltii TraethLafan All zostera.xls [C] Marine Recorder file: MRCCW3020000001C, MRCCW30200000008 [D] A series of MapInfo GIS layers in MapInfo Native format (Tables): - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats.
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Documents
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
Both sites were surveyed over one tide cycle working three hours either side of low water. Extent of the beds was recorded using portable dGPS to map boundaries. Sampling points at each site were chosen based on a grid system. Transect lines (Foryd Bay = 100 m apart, Traeth Lafan = 50 m apart) were chosen to correspond to specific Ordnance Survey easting lines and sampling was carried out at 25 m (Foryd Bay) or 50 m (Traeth Lafan) intervals along these transect lines. At each point GPS coordinate and photograph were taken and a 50 cm x 50 cm quadrat was used to record percentage cover of Zostera, cover of Ulva sp., description of substratum, mussel crumble and evidence of disease. Z. noltii beds were identified at Traeth Lafan and Foryd Bay during the CCW intertidal Phase 1 survey in 2001. All GPS positions are expected to be +/- 5 metre accuracy. All surveyors familiar with the attributes to be recorded during these surveys. Confidence of the accuracy of the data is high.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
-
- Menai Strait and Conwy Bay SAC
- marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
- Special Areas of Conservation (SAC) - SAC monitoring
- Foryd Bay [Y Foryd]
- Lafan sands (Lavan sands)(Traeth Lafan)
- seagrasses (see also potamogetonaceae and hydrocharitaceae)
- zostera
- posidoniaceae
- eelgrass
- zostera marina
- zostera angustifolia
- zostera noltii
- sediment flats
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
Allweddair
- SeaDataNet Parameter Discovery Vocabulary
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- Habitat extent
- Math
- Theme
Dyfyniad
- Dyddiad (Adolygu)
- 2021-01-06
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
- Teitlau cysylltiedig CNC
-
Intertidal monitoring of zostera noltii in the Menai Strait and Conwy Bay SAC in 2004/05
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
-
© CNC/NRW 2009. 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
- 4f4c4942-4343-5764-6473-313032303037 XML
- Laith Metadata
- English
- Dynodydd Rhiant
-
Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-12-09T12:33:31.5Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
-
1.0