Intertidal Monitoring of the Dyfi Estuary in Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2007
The purpose of this data capture is to establish sites for long-term monitoring and collect baseline and reference data using appropriate methods. Pen Llyn a'r Sarnau Special Area of Conservation is designated for five Annex 1 habitats and four subsidiary. Pen Llyn a'r Sarnau has representative examples of bar-built estuaries in north-west Wales, and includes the Glaslyn/Dwyryd, Mawddach and Dyfi estuaries.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS111184
- Alternative Title
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- Gwaith monitro rhynglanwol ar aber Afon Dyfi yn ACA Pen Llyn a'r Sarnau yn 2007
- 2007 CCW/ASML Pen Llyn a'r Sarnau SAC Dyfi Estuary monitoring MRCCW16300000009
- Metadata Language
- English
- Lineage
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There were three parts to the work: - In-situ recording of sediment characteristics (including epibiota, infauna and granulometry) at a grid of 106 stations across the whole area of the sediment flats; - Collection of samples from eleven stations for laboratory analysis of infauna; and, - Sediment granulometry and surveys including quadrat recording on three rocky shores. Modified version of the phase 1 style survey methodology was used. The Grid Maker tool in MapInfo was used to create a grid of 96 stations overlaying existing maps of the Dyfi sediment flats. A single 0.01m2 core sample was taken at each station. This was sieved in a nearby pool and all visible animals were identified and counted. The unrecognisable animals were collected for later inspection under a microscope. Records of conspicuous species and surface sediment features were made from each station within a circle of 1m radius around the core sample position. In addition to the in-situ recording, core samples were also taken from 11 sites for standard laboratory analysis of macro-infauna and granulometry. Three representative sites along the northern shore were selected for rocky shore surveys. At each, a transect route running down to the shore was divided into zones. The percentage cover of the major species in each zone was recorded, with the presence noted of all other species found. One zone was selected on each shore for sampling with 5 gridded quadrats (0.25 x 0.25 m), with all species present in each quadrat recorded either as percentage cover or as counts. Photographs were taken of each quadrat and each shore zone. Phase 1 surveys of intertidal habitats in the SAC were carried out between 1999 and 2003 (Brazier et al. 2007), providing detailed mapping of the intertidal biotopes with some information on characterizing species. Confidence in data is high as surveys were carried out by a team of highly experienced intertidal surveyors.
- Dataset Reference Date (Publication)
- 2009-03-01
Temporal Extent
- Begin date
- 2007-08-27
- End date
- 2007-08-31
- Topic category
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- Oceans
- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
- benthic boundary layer
Distribution
- Format Type and Description
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Database
()
- 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: - Dyfi Marine Recorder Spp Data 2007 V4.xls - HEBOG1730_Dyfi_ infauna_2007.xls [C] A series of MapInfo GIS layers in MapInfo Native format (Tables).Translations from the MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [D] Marine Recorder files: MRCCW16300000009 [E] Photographs of the site, sediment characteristics, core contents and quadrats.
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Database
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
There were three parts to the work: - In-situ recording of sediment characteristics (including epibiota, infauna and granulometry) at a grid of 106 stations across the whole area of the sediment flats; - Collection of samples from eleven stations for laboratory analysis of infauna; and, - Sediment granulometry and surveys including quadrat recording on three rocky shores. Modified version of the phase 1 style survey methodology was used. The Grid Maker tool in MapInfo was used to create a grid of 96 stations overlaying existing maps of the Dyfi sediment flats. A single 0.01m2 core sample was taken at each station. This was sieved in a nearby pool and all visible animals were identified and counted. The unrecognisable animals were collected for later inspection under a microscope. Records of conspicuous species and surface sediment features were made from each station within a circle of 1m radius around the core sample position. In addition to the in-situ recording, core samples were also taken from 11 sites for standard laboratory analysis of macro-infauna and granulometry. Three representative sites along the northern shore were selected for rocky shore surveys. At each, a transect route running down to the shore was divided into zones. The percentage cover of the major species in each zone was recorded, with the presence noted of all other species found. One zone was selected on each shore for sampling with 5 gridded quadrats (0.25 x 0.25 m), with all species present in each quadrat recorded either as percentage cover or as counts. Photographs were taken of each quadrat and each shore zone. Phase 1 surveys of intertidal habitats in the SAC were carried out between 1999 and 2003 (Brazier et al. 2007), providing detailed mapping of the intertidal biotopes with some information on characterizing species. Confidence in data is high as surveys were carried out by a team of highly experienced intertidal surveyors.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- Pen Llyn a'r Sarnau SAC
- Special Areas of Conservation (SAC) (see also Candidate Special Areas of Conservation cSAC)
- Special Areas of Conservation (SAC) - SAC monitoring
- intertidal
- Dyfi Estuary
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Habitat characterisation
- Zoobenthos generic abundance
- Zoobenthos taxonomic abundance
- 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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Intertidal monitoring of Pen Llyn a'r Sarnau SAC August 2007
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 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
- File Identifier
- 4f4c4942-4343-5764-6473-313131313834 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
- 2024-12-09T12:37:34.566Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0