Mean Trophic Rank Data for rivers in Wales

This dataset contains Mean Trophic Rank data for a selection of rivers in Wales. The purpose of this data capture was to assess the trophic status and eutrophication impact on rivers and streams using biotic indices. This is an old methodology and has now been superseded by LEAFPACKS. This dataset used to be supplied to former Countryside Council for Wales (CCW) by former Environment Agency Wales (EAW), both of whom now for part of Natural Resources Wales (NRW). This data is now currently held in the BIOSYS database where it can be extracted for internal use.

Identifier: NRW_DS110241

Alternative Title

Data'r Radd Droffig Gymedrig

Metadata Language: English

Lineage: Mean Trophic Rank, MTR is an assessment of trophic status and eutrophication impact on rivers and streams. The macrophyte flora and physical character of defined lengths (100m) of watercourse are surveyed using a standard checklist. The presence, absence and percentage area covered by each macrophyte are recorded. Each species is allocated a score (species trophic rank, STR) on a scale of 1-10 depending on its tolerance to eutrophication- the higher the score the lower the tolerance to nutrient enrichment. The scores of the species present are integrated as a mean value, weighted according to the relative percentage cover of individual species. The resulting value is the MTR score which increases with decreasing eutrophy. This methodology has now been superseded by LEAFPACKS, and the data is available in NRW's BIOSYS database.

Temporal Extent

Begin date: 1960-01-01

Topic category

Inland waters
Biota

Owner

Environment Agency (EA)

Millbank Tower, 25th Floor, 21//24 Millbank, London, SW1P 4XL, England

http://www.environment-agency.gov.uk/

Owner

Natural Resources Wales (NRW)

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

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

Originator

Environment Agency (EA)

Millbank Tower, 25th Floor, 21//24 Millbank, London, SW1P 4XL, England

http://www.environment-agency.gov.uk/

Extent

Geographic Extent: Wales (WLS)

Format Type and Description

Documents Documents ()

Specification

Excel spreadsheets

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: Mean Trophic Rank, MTR is an assessment of trophic status and eutrophication impact on rivers and streams. The macrophyte flora and physical character of defined lengths (100m) of watercourse are surveyed using a standard checklist. The presence, absence and percentage area covered by each macrophyte are recorded. Each species is allocated a score (species trophic rank, STR) on a scale of 1-10 depending on its tolerance to eutrophication- the higher the score the lower the tolerance to nutrient enrichment. The scores of the species present are integrated as a mean value, weighted according to the relative percentage cover of individual species. The resulting value is the MTR score which increases with decreasing eutrophy. This methodology has now been superseded by LEAFPACKS, and the data is available in NRW's BIOSYS database.

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

river Dee (afon Dyfrdwy)
river Gwyrfai (afon Gwyrfai)
River Usk
River Wye (Afon Gwy)
rivers (see also specific river names)
eutrophication
trophic status
macrophytes

Type: Theme

Citation

Date (Publication): 2023-12-31

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

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

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 and Environment Agency Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313130323431 XML

Metadata Language: English

Resource type: Dataset

Metadata Date: 2024-05-31T09:39:57.1Z

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.

Mean Trophic Rank Data for rivers in Wales

Identification

Temporal Extent

Extent

Extent

Distribution

Quality

Data quality

Keywords

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