Intertidal Monitoring of the Mawddach Estuary Sediments in Pen Llyn ar Sarnau Special Area of Conservation (SAC) 2012
Pen Llyn a'r Sarnau Special Area of Conservation (SAC) is designated for five Annex 1 habitats and four subsidiary ones. Of these, Estuaries and their constituent mudflats, sandflats and reefs, large shallow inlets and bays with intertidal Zostera beds, populations of the shingle-dwelling amphipod Pectenogammarus, piddocks in clay and lower shore boulder communities and Reefs, particularly biogenic reefs of Sabellaria alveolata are the main habitats of interest within the intertidal areas of the SAC. Conservation objectives for these habitats are given in the Regulation 33 advice for the SAC (CCW 2009).
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115333
- Alternative Title
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- Monitro Rhynglanwol ar waddodion aber Afon Dyfi yn ACA Pen Llyn a'r Sarnau yn 2012
- Metadata Language
- English
- Lineage
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Four infaunal community sampling transects were set up in 1999 which run out into the middle of the Mawddach estuary. These transects run across the sediment flats. There are two originating from the southern shore and two from the north shore and originally the sediment beyond the lower saltmarsh was sampled at 25 m intervals, to the lower water mark. In order to meet the sampling requirements of the Water Framework Directive (as well as the Habitats Directive), additional infaunal samples were required to provide sufficient sampling of sand, muddy sand and mud habitats. For this reason, some additional sampling stations were located along transects between the existing transects. At each 25 m station, the sediments were described and photographed. Once each of the three target zones were identified, a batch of 3 x 0.01 m2 core samples and a granulometry sample were collected from the middle of the zone. These cores were sieved in the field over a 0.5 mm mesh .All survey completed by professional and experienced marine field surveyors. Data quality and confidence considered moderate to high.
- Dataset Reference Date (Publication)
- 2012-07-31
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer; soil and sediment
Distribution
- Format Type and Description
-
-
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 with species data from quadrat surveys. [C] Photographs of the quadrats. [D] Marine Recorder file (Survey Number MRCCW16300000044)
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Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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Four infaunal community sampling transects were set up in 1999 which run out into the middle of the Mawddach estuary. These transects run across the sediment flats. There are two originating from the southern shore and two from the north shore and originally the sediment beyond the lower saltmarsh was sampled at 25 m intervals, to the lower water mark. In order to meet the sampling requirements of the Water Framework Directive (as well as the Habitats Directive), additional infaunal samples were required to provide sufficient sampling of sand, muddy sand and mud habitats. For this reason, some additional sampling stations were located along transects between the existing transects. At each 25 m station, the sediments were described and photographed. Once each of the three target zones were identified, a batch of 3 x 0.01 m2 core samples and a granulometry sample were collected from the middle of the zone. These cores were sieved in the field over a 0.5 mm mesh .All survey completed by professional and experienced marine field surveyors. Data quality and confidence considered moderate to high.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- Pembrokeshire Marine SAC
- intertidal
- Intertidal monitoring
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Sediment grain size parameters
- 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 : August 2008
- 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 July 2010
- NRW Related Title
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Intertidal SAC monitoring Pen Llyn a'r Sarnau SAC July 2012
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 2012. 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
- 4f4c4942-4343-5764-6473-313135333333 XML
- Metadata Language
- English
- Parent Identifier
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Across Wales Intertidal Monitoring Survey
NRW_DS109834
- Resource type
- Dataset
- Metadata Date
- 2024-05-31T09:27:20.734Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0