4f4c4942-4343-5764-6473-313130323431 English Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en 2025-03-07T17:06:04.73Z NRW 1.0 wel British National Grid (EPSG::27700) Mean Trophic Rank Data for rivers in Wales Mean Trophic Rank Data for rivers in Wales Data'r Radd Droffig Gymedrig NRW_DS110241 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 This is an old methodology and has now been superseded by LEAFPACKS.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. 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 This is an old methodology and has now been superseded by LEAFPACKS.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. Environment Agency (EA) Millbank Tower, 25th Floor, 21//24 Millbank, London, SW1P 4XL, England enquiries@environment-agency.gov.uk http://www.environment-agency.gov.uk/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Environment Agency (EA) Millbank Tower, 25th Floor, 21//24 Millbank, London, SW1P 4XL, England enquiries@environment-agency.gov.uk http://www.environment-agency.gov.uk/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Environment Agency (EA) Millbank Tower, 25th Floor, 21//24 Millbank, London, SW1P 4XL, England enquiries@environment-agency.gov.uk http://www.environment-agency.gov.uk/ Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Species distribution GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme river Dee (afon Dyfrdwy) river Gwyrfai (afon Gwyrfai) River Usk River Wye (Afon Gwy) rivers (see also specific river names) eutrophication trophic status macrophytes NRW Thesaurus 2023-12-31 geonetwork.thesaurus.local.theme.converted_nrw-keywords SeaDataNet Parameter Discovery Vocabulary 2021-01-06 geonetwork.thesaurus.external.theme.rdf+xml Integrated Public Sector Vocabulary 2013-04-03 geonetwork.thesaurus.external.theme.subjects NRW SMNR Vocabulary 2023-12-27 geonetwork.thesaurus.local.theme.converted_nrw-smnr-keywords There are no access restrictions on this data. NRW may release, publish or disseminate it freely. no limitations © 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. English inlandWaters biota SeaVoX Vertical Co-ordinate Coverages 2021-01-06 Wales (WLS) -5.777741 -2.608865 51.240829 53.512067 1960-01-01 Documents Excel spreadsheets 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 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false 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. 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.