Investigation into Musculus discors Beds in Pen Llyn a'r Sarnau (2011)
This survey was carried out as part of a MSc thesis in September 2011. To provide baseline data on M. discors beds around the LlPeninsula, with four specific aims: Establish the population structure for sample beds from around the LlPeninsula in order to investigate population structure and determine bed longevity. Identify the in-fauna/epi-fauna associated with M. discors beds. Investigate the sedimentation that occurs upon M. discors beds. Provide advice to CCW on whether M. discors should be included within a Local Biodiversity Action Plan for Gwynedd.
To determine M. discors population structure and influence on assemblage structure, twenty six, ten centimetre (cm) diameter cores of M. discors, associated fauna and sediment were collected by Seasearch volunteers on SCUBA from four randomly chosen beds in North Wales.were rinsed through a 63 micrometre (sieve with the sediment, M. discors and in-fauna retained. All liquid was retained for later filtration. M. discors were sorted from the sample and length measured to the nearest 0.1 millimetre (mm) using Vernier callipers with epifauna identified and enumerated (Rees et al., 2008). If present, new recruits were sorted from the sample and measured using a calibrated microscope slide (to the nearest 0.1mm).
In cases where there were high numbers of recruits, sub-sampling occurred with the abundance and size of a quarter of the total recruit population determined. All associated fauna were identified to the lowest taxonomic level possible.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115188
- Alternative Title
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- 2011 Hopkins Survey of Musculus Discors beds off the Lleyn Peninsula, North Wales MRCCW31600000008
- Metadata Language
- English
- Lineage
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Four sites sampled by diver operated core. A total of 26 cores (10cm diameter) taken. Samples processed in laboratory - sieved over 63 micron mesh. All fauna retained and then identified and counted. Musculus discors lengths measured. Confidence in this dataset is moderate as an inexperienced surveyor was used with assistance from experienced surveyors.
- Dataset Reference Date (Publication)
- 2011-09-30
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
))
Vertical Extent
- Medin Extent Keyword
-
benthic boundary layer
Vertical Extent
- Minimum value (metres)
- -15
- Maximum value (metres)
- -18.3
- Vertical CRS
Distribution
- Format Type and Description
-
-
Delimited
(
)
- Specification
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Data is held as an Excel spreadsheet and Marine Recorder (NBN) datafile
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Delimited
(
)
Quality
Data quality
- Quality Scope
- Dataset
- Conformity
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Explanation
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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Four sites sampled by diver operated core. A total of 26 cores (10cm diameter) taken. Samples processed in laboratory - sieved over 63 micron mesh. All fauna retained and then identified and counted. Musculus discors lengths measured. Confidence in this dataset is moderate as an inexperienced surveyor was used with assistance from experienced surveyors.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
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NRW Thesaurus
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- musculus discors
- Type
- Theme
Citation
- Date (Publication)
- 2025-01-08
Keywords
-
SeaDataNet Parameter Discovery Vocabulary
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
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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This dataset is wholly owned by Lisa Hopkinson, c/o Aberystwyth University However NRW has received permission to release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© Lisa Hopkinson 2011 There are no access restrictions to this data. NRW have received permission to release, publish or disseminate it freely. 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.
Attribution Statement
- Other constraints
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© Lisa Hopkinson 2011
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135313838 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
- 2026-03-03T12:51:11.512Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0