Tremadog Bay Subtidal Macrobenthic Study
The Habitats Directive establishes that the management of Special Area of Conservation (SACs) should aim to achieve the 'Favourable Conservation Status' (FCS) of habitats and species as defined in the Directive. In the case of SACs, the features to which FCS applies are the habitats and/or species listed in Annex I and Annex II of the Habitat Directive for which the individual site has been selected. Infaunal monitoring work is required to provide management feedback and enable reporting on the FCS of infaunal aspects of SACs, Special Protection Areas (SPAs: Birds Directive) and Special Sites of Scientific Interest (SSSI). The aim of this data capture was to gather repeatable data to provide reference conditions and to support the identification of the two characteristics of the Pen Llyn a'r Sarnau large shallow inlet and bays feature. Tremadog Bay a large shallow Inlet and Bay within the Pen Llyn a'r Sarnau SAC. Two important characteristics of this feature have been identified. These are: 1. The variety of subtidal sediment communities within the large shallow inlet and bay 2. The species richness and diversity of the sublittoral mixed sediment south west of Pwllheli
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS109835
- Alternative Title
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- 2004 CCW Tremadog Bay sublittoral sediment survey MRCCW3010000000F
- 2005 CCW Tremadog Bay sublittoral sediment survey MRCCW3010000000E
- Astudiaeth Facrofenthig Islanwol Bae Tremadog
- Metadata Language
- English
- Lineage
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A total of 115 samples were obtained at 39 sites within Tremadog Bay over a 2 year period. Analysis of samples produced a list of all benthic fauna (infauna and epifauna). In addition sediment composition was described. Biotopes were also assigned to each sample based on the classification of Connor et al, 2004. The sample stations were designed on a grid system, with additional stations created on known mixed sediment areas and additional areas or particular interest. Grab samples were collected with a 0.1m2 day grab. 2 or more samples were collected at each station, with 6 replicates taken in mixed sediment areas. A granulometry sample was taken from one of the grabs. Grab samples are sieved on board the survey vessel, through a 0.5mm mesh sieve, Samples with a large amount of coarse material were put through a 1mm mesh sieve first to speed up the process. The sieved material was then fixed on 10% formalin solution. Macrofaunal and particle size distribution analysis of the grab samples was completed under contract to EMU Ltd. Following the macrobenthic analysis, biotopes were assigned to each sampling station.
- Dataset Reference Date (Publication)
- 2008-04-30
Temporal Extent
- Begin date
- 2004-05-24
- End date
- 2005-04-14
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
))
Vertical Extent
- Medin Extent Keyword
-
benthic boundary layer
Vertical Extent
- Minimum value (metres)
- -4.3
- Maximum value (metres)
- -29.47
- Vertical CRS
Distribution
- Format Type and Description
-
-
Documents
Documents
()
- Specification
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[A] The report is held as a .pdf and Word document. [B] Figures are held as both .pdf and JPEG's. [C] Infaunal core species matrices and sediment analysis held in excel documents. [D] Species, habitat and PSA data also held in Marine Recorder (MRCCW3010000000E, MRCCW3010000000F). [E] Survey logs held in excel.
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Documents
Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
A total of 115 samples were obtained at 39 sites within Tremadog Bay over a 2 year period. Analysis of samples produced a list of all benthic fauna (infauna and epifauna). In addition sediment composition was described. Biotopes were also assigned to each sample based on the classification of Connor et al, 2004. The sample stations were designed on a grid system, with additional stations created on known mixed sediment areas and additional areas or particular interest. Grab samples were collected with a 0.1m2 day grab. 2 or more samples were collected at each station, with 6 replicates taken in mixed sediment areas. A granulometry sample was taken from one of the grabs. Grab samples are sieved on board the survey vessel, through a 0.5mm mesh sieve, Samples with a large amount of coarse material were put through a 1mm mesh sieve first to speed up the process. The sieved material was then fixed on 10% formalin solution. Macrofaunal and particle size distribution analysis of the grab samples was completed under contract to EMU Ltd. Following the macrobenthic analysis, biotopes were assigned to each sampling station.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- Tremadog Bay
- Pen Llyn a'r Sarnau cSAC
- Special Area of Conservation Monitoring
- macrobenthos
- sediment epifauna
- sediment infauna
- sediments
- large shallow inlet and bay
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Habitat characterisation
- Zoobenthos taxonomic abundance
- 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
-
Tremadog Bay subtidal macrobenthic study
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 on 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 Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and copyright of the owners. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313039383335 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
- 2024-05-31T09:44:17.127Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0