Sublittoral Monitoring Trials of North Pen Llyn 1998
The data was captured in order to assess the suitability of the biotope classification monitoring method trialled. A measure biotope richness as an attribute of north Pen Llyn reefs, was measured over three surveys transects between July and August 1998. Surveyors were experienced in Phase 2 survey methodology and each record was carefully re-examined by an experienced operator to ensure that data were comparable to those assigned to biotopes in the national classification, therefore were correctly assigned.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS111142
- Alternative Title
-
- Treialon monitro isarforol o ogledd Pen Llŷn 1998
- 1998 CCW Llyn Peninsula sublittoral monitoring trials JNCCMNCR40000772
- Metadata Language
- English
- Lineage
-
Fixed line transects were used in the following ways. A shot line was deployed from which divers reeled-out a 50 m tape from a pole. The pole was designed to measure a fixed transect width and in combination with the fixed 50 m travelled, limit the area surveyed. It was decided that the direction of deployments for the diver based transects would be random and that species and abundances were to be recorded in-situ using standard protocol. Divers were instructed to record the most conspicuous and characterising features of the biotope as opposed to recording all macroscopic organisms. Three broad trial zones were identified and in each zone between 20 and 30 random sampling points were generated using a random number generating program. There is a high confidence in this dataset. Surveyors were experienced in Phase 2 survey methodology and each record was carefully re-examined by an experienced operator to ensure that data were comparable to those assigned to biotopes in the national classification, therefore were correctly assigned. This trial was a precursor to the Across Wales Diving Monitoring Project (see metadata entry 109743).
- Dataset Reference Date (Publication)
- 2001-04-30
Temporal Extent
- Begin date
- 1998-07-31
- End date
- 1998-08-07
- Topic category
-
- Biota
Extent
Extent
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
- benthic boundary layer
Vertical Extent
- Minimum value (metres)
- -0.2
- Maximum value (metres)
- -43
- Vertical CRS
- urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height
Distribution
- Format Type and Description
-
-
Documents
()
- Specification
-
[A] The data collected are presented in the report and species, habitat and biotope data collected are also stored in Marine Recorder. [B] MNCR forms are also held in hardcopy.
-
Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
Fixed line transects were used in the following ways. A shot line was deployed from which divers reeled-out a 50 m tape from a pole. The pole was designed to measure a fixed transect width and in combination with the fixed 50 m travelled, limit the area surveyed. It was decided that the direction of deployments for the diver based transects would be random and that species and abundances were to be recorded in-situ using standard protocol. Divers were instructed to record the most conspicuous and characterising features of the biotope as opposed to recording all macroscopic organisms. Three broad trial zones were identified and in each zone between 20 and 30 random sampling points were generated using a random number generating program. There is a high confidence in this dataset. Surveyors were experienced in Phase 2 survey methodology and each record was carefully re-examined by an experienced operator to ensure that data were comparable to those assigned to biotopes in the national classification, therefore were correctly assigned. This trial was a precursor to the Across Wales Diving Monitoring Project (see metadata entry 109743).
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
-
- marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
- 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)
- methodology
- survey methods (survey techniques) (survey) (surveying)
- trials
- biotopes
- Pen Llyn a'r Sarnau SAC
- reef
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
-
- Zoobenthos generic abundance
- Zoobenthos taxonomic abundance
- Zoobenthos taxonomy-related counts
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
-
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
-
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
-
© 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
- 4f4c4942-4343-5764-6473-313131313432 XML
- Metadata Language
- English
- Parent Identifier
-
Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501
- Resource type
- Dataset
- Metadata Date
- 2024-12-09T12:32:56.315Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0