Special Area of Conservation (SAC) Monitoring: Petalwort Petalophyllum ralfsii at Y Twyni o Abermenai i Aberffraw cSAC (2004)
Petalwort Petalophyllum ralfsii is a pale green thalloid liverwort with erect lamellae on its upper surface, that grows in open, damp, calcareous dune slacks, often on low hummocks rather than on the very wet ground, on compacted sandy/muddy bryophyte-rich turf. The inclusion of the Petallophyllum ralfsii on Annex II of the EU Habitats and Species Directive requires NRW to identify Special Areas of Conservation (SAC) for the species and to ensure that Favourable Conservation Status (FCS) applies. Whilst some background work has enabled the identification of key areas for Petallophyllum ralfsii on the candidate SAC, further information on its current extent, distribution and habitat associates are required. The purpose of this data capture was to map the distribution, density and habitat characteristics of Petalophyllum ralfsii at Twyni o Abermenai i Aberffraw cSAC. This will enable the targets within the conservation objective to be confirmed and to report on the condition of the Petalophyllum on the site.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS115608
- Alternative Title
-
- Monitro ACA: Petalophyllum ralfsii yn yACA Twyni Abermenai i Aberffraw (2004)
- Metadata Language
- English
- Lineage
-
The area to be covered by the survey is approximately 146 ha in extent distributed across two dune systems; Newborough Warren, 2319 ha and Aberffraw 368 ha (dune slacks to be visited are indicated on the attached maps). At each location where Petalophyllum is present: - The presence of Petalophyllum is to be marked on both a 1:10,000 map and the aerial photographs provided. - Where possible GPS locations with at least 15m precision should also be taken. - An estimate of abundance within each area of a slack that supports Petalophyllum should be made on the following scale: 1-5 per m2, 5-20 per m2 20-50 per m2 and >50 per m2. - The area over which the Petalophyllum is distributed should be given in m2. - Sketch maps and photographs should be produced showing the location of the Petalophyllum within the slack. - A 2x2m quadrat should be established in an area representative of the habitat in which Petalpohyllum is found and its location documented using photographs and the sketch map. The following data should be recorded within each quadrat:- 1. Vegetation height (cm). 2. % bare ground 3. Presence of an algal crust 4. Presence of standing water 5. The plant species within the quadrat and their DOMIN values 6. The number of Petalophyllum thalli
- Dataset Reference Date (Publication)
- 2004-03-31
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
- Geographic Extent
- SIR YNYS MON - ISLE OF ANGLESEY
))
Distribution
- Format Type and Description
-
-
Documents
()
- Specification
-
[A] The final report in Microsoft Word and Adobe PDF formats. [B] GIS layers of the locations of Petalophyllum ralfsii [C] Quadrat data in Microsoft Excel Format [D] Survey location area maps in Microsoft Word Documents.
-
Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
-
The area to be covered by the survey is approximately 146 ha in extent distributed across two dune systems; Newborough Warren, 2319 ha and Aberffraw 368 ha (dune slacks to be visited are indicated on the attached maps). At each location where Petalophyllum is present: - The presence of Petalophyllum is to be marked on both a 1:10,000 map and the aerial photographs provided. - Where possible GPS locations with at least 15m precision should also be taken. - An estimate of abundance within each area of a slack that supports Petalophyllum should be made on the following scale: 1-5 per m2, 5-20 per m2 20-50 per m2 and >50 per m2. - The area over which the Petalophyllum is distributed should be given in m2. - Sketch maps and photographs should be produced showing the location of the Petalophyllum within the slack. - A 2x2m quadrat should be established in an area representative of the habitat in which Petalpohyllum is found and its location documented using photographs and the sketch map. The following data should be recorded within each quadrat:- 1. Vegetation height (cm). 2. % bare ground 3. Presence of an algal crust 4. Presence of standing water 5. The plant species within the quadrat and their DOMIN values 6. The number of Petalophyllum thalli
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
-
- Favourable Conservation Status (favourable condition)
- Special Area of Conservation Monitoring
- Special Areas of Conservation (SAC) - SAC monitoring
- petalophyllum ralfsii
- petalwort
- Tywyn Aberffraw
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
-
An assessment of the condition of Petallophyllum ralfsii (Wils.) Nees and Gottsche at the Tywyni o Abermenai i Aberffraw cSAC
Constraints
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 2004 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
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313135363038 XML
- Metadata Language
- English
- Parent Identifier
-
Condition monitoring of Special Areas of Conservation (SACs) in Wales
NRW_DS110194
- Resource type
- Dataset
- Metadata Date
- 2024-05-31T09:43:42.443Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0