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 This is an old methodology and has now been superseded by LEAFPACKS.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.
- Dull adnabod
- Rhychwant
- Dosbarthiad
- Ansawdd
- Allweddeiriau
- System Cyfeirio Gofodol
- Cynnwys
- Cyfyngiadau
- Cynnal a chadw
- Metadata
Dull adnabod
- Dynodydd
- NRW_DS110241
- Teitl Amgen
-
- Data'r Radd Droffig Gymedrig
- Laith Metadata
- English
- Datganiad
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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 This methodology has now been superseded by LEAFPACKS, and the data is available in NRW's BIOSYS database.
Ystod amser
- Dyddiad cychwyn
- 1960-01-01
- Categori pwnc
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- Inland waters
- Biota
Rhychwant
Rhychwant
- Hyd
- Wales (WLS)
))
Dosbarthiad
- Fformat - Math a Disgrifiad
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-
Documents
Documents
()
- Math
-
Excel spreadsheets
-
Documents
Documents
()
Ansawdd
Ansawdd Data
- Cwmpas Ansawdd
- Dataset
- Datganiad
-
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.
Allweddeiriau
Allweddair
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2008-06-01
Allweddair
- NRW Thesaurus
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- river Dee (afon Dyfrdwy)
- river Gwyrfai (afon Gwyrfai)
- River Usk
- River Wye (Afon Gwy)
- rivers (see also specific river names)
- eutrophication
- trophic status
- macrophytes
- Math
- Theme
Dyfyniad
- Dyddiad (Cyhoeddiad)
- 2023-12-31
System Cyfeirio Gofodol
Cynnwys
Gwybodaeth Cynnwys
Proffil CNC
Elfennau CNC
Cyfyngiadau
Cyfyngiadau
Cyfyngiadau ar Fynediad a Defnydd Cyhoeddus
- Math o Gyfyngiad
- Other restrictions
Cyfarwyddeb Cyfyngiadau Mynediad
- Cyfyngiadau
- no limitations
Testun cyfyngiadau mynediad
- Cyfyngiadau eraill
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There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Defnyddiwch gyfyngiadau
- Cyfyngiadau Defnyddio
- Other restrictions
- Cyfyngiadau eraill
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© 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
Metadata
- Dynodydd Ffeil
- 4f4c4942-4343-5764-6473-313130323431 XML
- Laith Metadata
- English
- Math o adnodd
- Dataset
- Dyddiad Metadata
- 2024-05-31T09:39:57.1Z
- Enw Safonol Metadata
- NRW
- Fersiwn Metadata
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1.0