Monitoring of Yellow Trumpet Anemone Parazoanthus axinellae at Pen Cristen, Bardsey Island

Yellow trumpet anemone Parazoanthus axinellae is primarily a south-western species, found at Bardsey Island and is close to the northern boundary of its known distribution at this location. This species has been selected as an attribute for monitoring the condition of reefs in the Special Area of Conservation (SACs). In 1999 an assessment of appropriate methods was made to look at monitoring the abundance and population structure of Parazoanthus axinellae and the erect branching sponge Axinella dissimilis. The trials focused on comparing different techniques to find the one that was most repeatable and therefore sensitive to population change. Trials took place at Pen Cristen, on Bardsey Island. Subsequent monitoring of the Parazoanthus axinellae assemblage has occurred annually at this location when weather conditions allow. The purpose of this data capture was to monitor the numerical abundance, percentage cover and distribution of individuals within the dominant Parazoanthus axinellae assemblage using a quantitative photographic approach. This will contribute to condition assessment of the reef feature in the Pen Llyn a'r Sarnau SAC.

Identification

Identifier
NRW_DS110689
Alternative Title
  • An Assessment of appropriate methods for monitoring a population of colonial anemone at Bardsey Island
Metadata Language
English
Lineage

The initial data was collected as part of the LIFE monitoring trials. Initial trials compared recording of quadrats by video and by still photography at one station at Pen Cristen. It was concluded that using still photography produced better, more repeatable results. Further details can be found in Marine Monitoring Report 2.The following standard procedure is now followed for data capture at Pen Cristen. 3 permanent stations have been set up, Notch face, Wrinkle face and Long face. These are marked with ring bolts around the perimeter. Divers string tape measures between the bolts in order to position a quadrat along the edge of the tape measure. A picture is taken of the sessile community within the quadrat. The quadrat is then moved to a position along the tape that overlaps the first quadrat by 100mm. The process is repeated to form a continuous photographic 'belt'. Further details can be found in Marine Monitoring report 25b, SOP 06. Images from each quadrat are analysed and the area covered by Parazoanthus recorded along with the number of polyps.
Dataset Reference Date (Publication)
2011-12-31

Temporal Extent

Begin date
1999-08-19
End date
2011-12-31
 
Topic category
  • Biota
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Originator
  Countryside Council for Wales (CCW) -
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
 

Extent

Extent

Geographic Extent
Irish Sea
Geographic Extent
Menai Strait
Geographic Extent
Cardigan Bay
Geographic Extent
Tremadog Bay
Geographic Extent
GWYNEDD - GWYNEDD
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword

benthic boundary layer

Vertical Extent

Minimum value (metres)
0
Maximum value (metres)
-20
Vertical CRS
 
 

Distribution

Format Type and Description
  • Documents ( )

    Specification

    [A] Reports in word and pdf format. [B] Raw data as Excel spreadsheets, [C] Videos as avi. Files, [D] Images files are held as jpgs and in some cases NEF format is also available.

 

Quality

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

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

The initial data was collected as part of the LIFE monitoring trials. Initial trials compared recording of quadrats by video and by still photography at one station at Pen Cristen. It was concluded that using still photography produced better, more repeatable results. Further details can be found in Marine Monitoring Report 2.The following standard procedure is now followed for data capture at Pen Cristen. 3 permanent stations have been set up, Notch face, Wrinkle face and Long face. These are marked with ring bolts around the perimeter. Divers string tape measures between the bolts in order to position a quadrat along the edge of the tape measure. A picture is taken of the sessile community within the quadrat. The quadrat is then moved to a position along the tape that overlaps the first quadrat by 100mm. The process is repeated to form a continuous photographic 'belt'. Further details can be found in Marine Monitoring report 25b, SOP 06. Images from each quadrat are analysed and the area covered by Parazoanthus recorded along with the number of polyps.
 

Keywords

Keywords

GEMET - INSPIRE themes, version 1.0
Type
Theme

Citation

Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus
  • marine monitoring (see also marine surveys)
  • yellow trumpet anemone
  • Pen Llyn a'r Sarnau SAC
  • parazoanthus axinellae
  • Special Area of Conservation Monitoring
  • Bardsey Island (Ynys Enlli)
Type
Theme

Citation

Date (Publication)
2026-08-27
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary
Type
Theme

Citation

Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
Latitude and Longitude (EPSG::4326)
 

Content

Content Information

NRW Profile

Custom Elements

NRW Related Title

An assessment of appropriate methods for monitoring a population of colonial anemone at Bardsey Island (Ynys Enlli) Wales, UK
 

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 2011 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
4f4c4942-4343-5764-6473-313130363839 XML
Metadata Language
English
Parent Identifier
Across Wales Diving Monitoring Project (2004)

NRW_DS109743
Resource type
Dataset
Metadata Date
2026-09-28T14:06:37.734Z
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

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