Community Composition and Spatial Variation of Epifauna on the Horse Mussel Modiolus Reef (1999)
The purpose of this data capture was to examine spatial variation in epifaunal community composition in order to inform the development of a sensitive and cost-effective future monitoring strategy. Modiolus modiolus reef communities are comparatively rich in species and because they are also scarce in the UK it was considered important to monitor elements of community composition as an attribute that indicates the condition of these features. This dataset contains the results of in-situ sampling carried out by divers to try to determine the spatial variation in epifaunal community composition on the horse mussel reef off the coast of North Pen Llyn.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS111878
- Alternative Title
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- Cyfansoddiad cymunedau ac amrywiaeth gofodol epiffawna ar riff marchfisglod Modiolus
- 1999 CCW Modiolus monitoring trial survey off North Pen Llyn JNCCMNCR40000775
- Metadata Language
- English
- Lineage
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The following methodologies were used. Epifaunal recording replicate quadrat sampling position markers were deployed at stratified random positions along the axis of 7 reef 'crest' and 'trough' features. 6 rows were sampled by divers 'in-situ' and the 7th row was recorded using video. Divers were instructed to record as many species as possible on their recording slate and 'gridded' quadrats were used to assist in systematic counting or video recording. Each diver recorded the epifauna within a quadrat from as many rows (1-6) as possible in order to spread any errors associated with recording experience and inter-worker variability across rows.
- Additional Information
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This is the trial of methods that were later developed and superceeded by the use of video quadrats, see metadata entry Monitoring the health of the North Llyn Modiolus Reef (OLIB URI 110271
- Dataset Reference Date (Publication)
- 2001-03-01
Temporal Extent
- Begin date
- 1999-06-08
- End date
- 1999-06-10
- Topic category
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- Biota
Extent
Extent
- Geographic Extent
- Swansea Bay
- Geographic Extent
- Cardigan Bay
- Geographic Extent
- Tremadog Bay
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer
Distribution
- Format Type and Description
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Database
()
- Specification
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[A] Data is in Marine Recorder 1999 CCW Modiolus monitoring trial survey off North Pen Llyn JNCCMNCR40000775 [B] MNCR form are held in hardcopy format. [C] Report also in hard copy.
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Database
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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The following methodologies were used. Epifaunal recording replicate quadrat sampling position markers were deployed at stratified random positions along the axis of 7 reef 'crest' and 'trough' features. 6 rows were sampled by divers 'in-situ' and the 7th row was recorded using video. Divers were instructed to record as many species as possible on their recording slate and 'gridded' quadrats were used to assist in systematic counting or video recording. Each diver recorded the epifauna within a quadrat from as many rows (1-6) as possible in order to spread any errors associated with recording experience and inter-worker variability across rows.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- horse mussel
- modiolus modiolus
- reef
- Pen Llyn a'r Sarnau SAC
- epifauna
- marine monitoring (see also marine surveys)
- marine surveys (intertidal & subtidal surveys) (littoral survey) (sublittoral surveys) (bathymetric survey) (see also marine monitoring and MNCR)
- monitoring (see specific types of monitoring eg. woodland monitoring)
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Habitat characterisation
- 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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The establishment of a programme of surveillance and monitoring for judging the condition of the features of Pen Llyn a'r Sarnau cSAC : 1. Progress to March 2001
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
- 4f4c4942-4343-5764-6473-313131383738 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
- 2024-05-31T09:39:10.606Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0