Results of a Study into the Use of a Phase 2 Sampling Grid as a Monitoring Strategy for the Mawddach Estuary. (1999 CCW Marine Monitoring trials)
The aim of this survey was to investigate the feasibility of using a phase 2 sampling grid methodology to determine the proportion of muddy and sandy communities and the distribution of major communities within the estuary. The Mawddach is one of the best examples of a small, drying, bar-built estuary in Britain and, with its mountainous catchment area it has some of the lowest nutrient inputs in Wales. In order to be able to report on the condition of the estuary a number of attributes have been identified which require monitoring. This dataset contains the results of a survey carried out to trial a sampling strategy and methodology that addresses two of these attributes: - The relative proportion of muddy and sandy communities. - The distribution of major communities within the estuary.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS111146
- Alternative Title
-
- 1999 CCW/NWNWSFC Mawddach Estuary littoral survey JNCCMNCR40000739
- Canlyniadau astudiaeth ar ddefnyddio grid samplu cam 2 fel strategaeth fonitro yn aber Mawddach
- Metadata Language
- English
- Lineage
-
MapInfo was used to set up an evenly spaced grid of sampling stations across the whole estuary, from high water springs to low water springs. The grid was scaled to allow for at least five sampling stations on each of the major intertidal biotopes (this done using the 1997 Marine Intertidal Phase 1 map of the estuary). An extra 30 sample stations were added to account for 'minor' biotopes not already covered by the grid. At each sample station (saltmarsh was not sampled) sediment surface features and conspicuous species were noted. Eight cores were collected from each sample station. These were pooled and the infauna subsequently processed. The fauna present, identified to species level, were recorded on a spreadsheet as were the results of analysis of particle size characteristics of the granulomatric sample. The infaunal and granulometrc data were then processed to identify the biotopes.
- Dataset Reference Date (Publication)
- 2001-04-30
Temporal Extent
- Begin date
- 1999-09-08
- End date
- 1999-10-13
- Topic category
-
- Biota
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
- Geographic Extent
- Wales (WLS)
))
Vertical Extent
- Medin Extent Keyword
-
benthic boundary layer
Vertical Extent
- Minimum value (metres)
- -6.1
- Maximum value (metres)
- -14
- 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
-
-
Database
Database
()
- Specification
-
[A] The data on species, sediment analysis, biotope etc are recorded on paper MNCR forms and held in Marine Recorder. [B] The results are also presented in a hardcopy report format. [C] Spatial data is held as MapInfo GIS files.
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Database
Database
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
MapInfo was used to set up an evenly spaced grid of sampling stations across the whole estuary, from high water springs to low water springs. The grid was scaled to allow for at least five sampling stations on each of the major intertidal biotopes (this done using the 1997 Marine Intertidal Phase 1 map of the estuary). An extra 30 sample stations were added to account for 'minor' biotopes not already covered by the grid. At each sample station (saltmarsh was not sampled) sediment surface features and conspicuous species were noted. Eight cores were collected from each sample station. These were pooled and the infauna subsequently processed. The fauna present, identified to species level, were recorded on a spreadsheet as were the results of analysis of particle size characteristics of the granulomatric sample. The infaunal and granulometrc data were then processed to identify the biotopes.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
-
- Pen Llyn a'r Sarnau SAC
- Mawddach Estuary
- Phase 2 Survey (Phase II)
- monitoring (see specific types of monitoring eg. woodland monitoring)
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
-
- Habitat characterisation
- Habitat extent
- Zoobenthos taxonomic abundance
- Zoobenthos generic abundance
- 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
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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 2001 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
- 4f4c4942-4343-5764-6473-313131313436 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
- 2024-05-31T09:23:34.223Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0