Identification

Dynodydd

Identifier

NRW_DS115641

Teitl Amgen

Alternative Title

• Monitro ACA: Asesu Cyrsiau Dwr sy n cynnwys Llystyfiant Ranunculion Fluitantis a Callitricho-Batrachion ACA Afon Gwy

Laith Metadata

Metadata Language

English

Lineage

For each 500 m section a surveyor walks the river ensuring that all macrophytes on the channel and margin are recorded. Each macrophyte is assigned a measure of its percentage cover and of its abundance relative to other taxa. In addition, some physical features are recorded against standard classes and values. A section is typified by running the data through a key (Holmes et al. 1999, page: 104), which will lead to one of the types listed in Appendix C. Recording Mean Trophic Rank involves a surveyor walking the wetted area of the channel for 100 m, recording the cover of all macrophytes on a five point scale. The abundance of each scoring taxon is then multiplied by the score for the taxon (STR) provided in the manual, all the scores are summed and the total divided by the sum of the cover values to derive an MTR score. A series of thresholds are then given from which the decision is made as to whether or not the discharge is considered to have a significant enough effect that it needs to be modified. Common Standards Monitoring involves analysis of a number of different data sets including those derived from JNCC macrophyte survey and from River Habitat Survey (RHS). If any of the analyses fail, then the section is deemed to have failed. For this reason, it is reasonable to consider only one element of the river CSM process - the macrophyte element.

Dyddiad cyfeirnod y set ddata (Cyhoeddiad)

Dataset Reference Date (Publication)

2007-03-31

Extent

Extent

Hyd

Geographic Extent

POWYS - POWYS

Hyd

Geographic Extent

SIR FYNWY - MONMOUTHSHIRE

N

W

E

S

 

Distribution

Quality

Keywords

Spatial Reference System

Content

Constraints