Intertidal Monitoring of Eelgrass (Zostera marina) Beds in Pen Llyn a'r Sarnau Special Areas of Conservation (SACs) 2010
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. Eelgrass (Zostera marina), is considered to be scarce (present in 16-100 ten km squares) is protected through the EC Habitats Directive and is classed as a UK Biodiversity Action Plan (BAP) Priority Habitat. Data is captured to support reporting on conservation status of the Pen Llyn air Sarnau SAC.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS114459
- Alternative Title
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- 2010 CCW / ASML Pen Llyn a'r Sarnau SAC intertidal Zostera marina monitoring MRCCW16300000027
- Gwaith Monitro Rhynglanwol - Zostera marina yn ACA Pen Llyn a'r Sarnau 2010
- Metadata Language
- English
- Lineage
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The Zostera marina beds were mapped using the tracking facility on the GPS receivers, although on 14th July the tide failed to expose more than the uppermost plants in the diffuse bed. Digital photographs were also taken at points of interest during all Z. marina surveys. Whilst the perimeter of the Porth Dinllaen bed was being mapped, several pairs of surveyors walked north/south transects along the bed on the beach. The surveyors assessed quadrats at regular intervals noting Zostera density, substratum type, abundance of core taxa and presence/ absence of lesser taxa. The transects surveyed at Porth Dinllaen were worked using handheld GPS receivers. All survey completed by professional and experienced marine field surveyors. Data quality and confidence considered high. Intertidal SAC monitoring, previous work was also carried out in 2009 and 2008.
- Dataset Reference Date (Publication)
- 2011-04-30
Temporal Extent
- Begin date
- 2010-07-11
- End date
- 2010-07-16
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
- benthic boundary layer
Distribution
- Format Type and Description
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Documents
()
- Specification
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[A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version [B] Excel spreadsheets of data: PLAS 2010 Sabellaria Data.xls PLAS 2010 Porth Dinllaen Zostera.xls PLAS 2010 Photo Log.xls [C] 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. [D] Marine Recorder files [E] Photographs of the site, sediment characteristics, core contents and quadrats.
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Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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The Zostera marina beds were mapped using the tracking facility on the GPS receivers, although on 14th July the tide failed to expose more than the uppermost plants in the diffuse bed. Digital photographs were also taken at points of interest during all Z. marina surveys. Whilst the perimeter of the Porth Dinllaen bed was being mapped, several pairs of surveyors walked north/south transects along the bed on the beach. The surveyors assessed quadrats at regular intervals noting Zostera density, substratum type, abundance of core taxa and presence/ absence of lesser taxa. The transects surveyed at Porth Dinllaen were worked using handheld GPS receivers. All survey completed by professional and experienced marine field surveyors. Data quality and confidence considered high. Intertidal SAC monitoring, previous work was also carried out in 2009 and 2008.
Keywords
Keywords
Keywords
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Habitat extent
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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Across Wales intertidal SAC monitoring Pen Llyn a'r Sarnau SAC July 2010
- NRW Related Title
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Across Wales intertidal SAC monitoring Pen Llyn a'r Sarnau SAC July 2009
- NRW Related Title
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Across Wales intertidal SAC monitoring Pen Llyn a'r Sarnau SAC : August 2008
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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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
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© CNC/NRW 2011 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
- File Identifier
- 4f4c4942-4343-5764-6473-313134343539 XML
- Metadata Language
- English
- Parent Identifier
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Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501
- Resource type
- Dataset
- Metadata Date
- 2024-12-09T12:33:01.051Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0