2010 Countryside Council for Wales, Subtidal Species Diversity Layer (Chao2 Analysis)

This layer was produced for Countryside Council for Wales (CCW) as part of the 'Identifying Marine Biodiversity Hotspots in Wales' project. The Chao2 estimator was applied to species data collated from the CCW and the National Biodiversity Network (NBN) Gateway (Marine Recorder Snapshot), the MarLIN databases and the Data Archive for Seabed Species and Habitats data (DASSH). Chao2 is a technique for extrapolating species richness from limited numbers of samples based on the concept that rare species carry most information about the number of missing species; this was employed to check for artifacts in analyses. The purpose of this data capture was to establish subtidal diversity from known data around the Welsh coastline, from mean high water to 12 nautical miles offshore. An assessment of the suitability of data was carried out, taking into account the source of the data, its age, spatial, taxonomic and methodological accuracy. Data were also graded on survey quality using the following three categories with respect to field surveyors: professional and academic; volunteer with expert ID; and volunteer. Derived confidence ratings were recorded in the metadata and low quality data were flagged and removed from subsequent analyses.

Identifier: NRW_DS112415

Alternative Title

Cyngor Cefn Gwlad Cymru 2010, Haen amrywiaeth rhywogaethau islanwol (dadansoddiad chao2)
subtidal_chao2

Metadata Language: English

Lineage: Distinct survey data were imported into a geodatabase. The full species list was matched against the World Register of Marine Species (WoRMS) and any unrecognised species corrected. The final list was matched against an edited list of candidate Nationally Important Marine Features (NIMF) to identify those recorded in Wales. An assessment of the suitability of these data for biodiversity assessment was carried out taking into account the source of the data, its age, spatial, taxonomic and methodological accuracy and quality using criteria set out in the ISO 19115 standard for geospatial metadata. A hexagonal grid was used because they offer the best alignment to complex features, such as the Welsh coastline. The optimal size was determined as 20km2 for the subtidal region. The Chao2 estimator measure was calculated for each broad sampling method type, re-combined by hexagon, and presented as a separate layer on a continuous scale. Chao2 is a technique for extrapolating species richness from limited numbers of samples based on the concept that rare species carry most information about the number of missing species; this was employed to check for artifacts in analyses.

Dataset Reference Date (Publication): 2010-03-31

Temporal Extent

Begin date: 1968-01-01

End date: 2008-12-31

Topic category

Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Countryside Council for Wales (CCW)

Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW

http://naturalresourceswales.gov.uk/splash?orig=/

Originator

Joint Nature Conservation Committee (JNCC)

Monkstone House, City Road, Peterborough, PE1 1JY, England

http://www.jncc.gov.uk/

Originator

Marine Life Information Network (MarLIN)

The Marine Biological Association of the UK, Citadel Hill, Plymouth, Devon, PL1 2PB

http://www.marlin.ac.uk/

Extent

Geographic Extent: Wales (WLS)

Vertical Extent

Medin Extent Keyword: benthic boundary layer

Format Type and Description

Geographic Information System Geographic Information System ()

Specification

MapInfo layers

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
Degree: false

Lineage: Distinct survey data were imported into a geodatabase. The full species list was matched against the World Register of Marine Species (WoRMS) and any unrecognised species corrected. The final list was matched against an edited list of candidate Nationally Important Marine Features (NIMF) to identify those recorded in Wales. An assessment of the suitability of these data for biodiversity assessment was carried out taking into account the source of the data, its age, spatial, taxonomic and methodological accuracy and quality using criteria set out in the ISO 19115 standard for geospatial metadata. A hexagonal grid was used because they offer the best alignment to complex features, such as the Welsh coastline. The optimal size was determined as 20km2 for the subtidal region. The Chao2 estimator measure was calculated for each broad sampling method type, re-combined by hexagon, and presented as a separate layer on a continuous scale. Chao2 is a technique for extrapolating species richness from limited numbers of samples based on the concept that rare species carry most information about the number of missing species; this was employed to check for artifacts in analyses.

Keywords

GEMET - INSPIRE themes, version 1.0

Species distribution

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

marine (maritime)
marine conservation (see also specific geographical areas or sites eg Skomer-marine protected areas,marine nature reserves)
marine species
species (see also endangered species)
distributions
diversity
Subtidal
geographical information systems (GIS)

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary

Macroalgae and seagrass taxonomy-related counts
Zoobenthos taxonomic abundance

Type: Theme

Citation

Date (Revision): 2021-01-06

Code: geonetwork.thesaurus.external.theme.rdf+xml

Code: Latitude and Longitude (EPSG::4326)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Mapping marine benthic biodiversity in Wales

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 to this data. NRW may release, publish or disseminate it freely.

Use Constraints

Use constraints type: Other restrictions

Other constraints: © CNC/NRW 2010. 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

File Identifier: 4f4c4942-4343-5764-6473-313132343135 XML

Metadata Language: English

Parent Identifier: Mapping Marine Benthic Biodiversity in Wales
NRW_DS111816

Resource type: Dataset

Metadata Date: 2024-05-31T09:37:48.158Z

Metadata Standard Name: NRW

Metadata Standard Version: 1.0

pointOfContact

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Publishing Body

Access the portal

Full access to the portal and metadata.

2010 Countryside Council for Wales, Subtidal Species Diversity Layer (Chao2 Analysis)

Identification

Temporal Extent

Extent

Extent

Vertical Extent

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Metadata

Metadata

Publishing Body