Monitoring of Algal Diversity and Richness on the Glacial Moraine of Sarn Badrig
Monitro cyfoeth ac amrywiaeth algau ar farian rhewlifol Sarn Badrig.

  • English
  • wel
  • All

Sarn Badrig (St Patrick's Causeway) is a belt reef running in a south-westerly direction approximately 18 km out from Mochras Point near Harlech. This reef forms part of the Pen Llyn a'r Sarnau Special Area of Conservation (SAC) protected under the EC Habitats Directive. The reef is composed of glacial moraine deposits and is exposed in patches at low water along most of its length. The reef structure is very mobile and subject to tidal currents, wave action and sand scour and therefore many of the seaweeds found on the reef are annual or perennial species able to survive the scoured conditions. These include a number of rare species that would be overgrown by species that would normally establish on more stable reef environment. The purpose of this data capture was to map the distribution of substratum types and select biological indices. Also to assess and determine a suitable methodology to monitor algal richness within a benthic habitat of dynamic substrata. The site will only be assessed for its algae richness and diversity every 2 years.

Identification

Dynodydd
Identifier
NRW_DS110947
Teitl Amgen
Alternative Title
  • Sarn Badrig algae diversity and richness
Laith Metadata
Metadata Language
English
Lineage

Algae diversity and richness monitoring at Sarn Badrig is conducted in 2 stages. Stage 1, habitat mapping and stage 2, algal richness. The site is marked with a permanent tripod structure and provides a reference point for mapping the surrounding substrata. An area 25 m x 25 m is marked out North East of the tripod marker and at 5 m intervals a quadrat is used to record the substratum (percentage cover of sand, gravel, pebbles and boulder) and biota features (percentage cover of algal turf, presence/absenceof H.siliquosa and Laminaria spp). Also recorded is how representative the area is of the habitat MIR.HalXK. This process is repeated North West, South West and South East of the marker to form a 50 m x 50 m area with the marker in the centre. A total of 100 quadrats are completed. The area that is most representative of the habitat MIR.HalXK is selected for monitoring algal richness. Its distance and bearing from the pyramid is recorded. Due to the difficulty of identifying algae species in-situ within a limited time period, different methods of measuring species richness were investigated in 2005. In 2007, 2 divers each used a 0.25 m quadrat to record algal species, in 10 min intervals up to one hour. The quadrat is used as a tool to focus the search and is moved around the sector by the divers. Detailed methodologies can be found in Marine Monitoring Report 25b (standard operating procedures 7 and 8 for the 2005 methods). Established as Life Monitoring Trials - CCW report 380, chapter 3.1.1 Contract Science Report 380, followed by contracted Across Wales diving project. Whilst most species were identified in situ, some were gathered for subsequent laboratory analysis using algal identification keys and microscope. Samples of algae were pressed, scanned on a flat-bed colour scanner and incorporated into the CCW herbarium.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2009-08-01

Temporal Extent

Begin date
2005-06-09
End date
2009-12-31
 
Categori pwnc
Topic category
  • Biota
    Biota
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Various including volunteer recorders -
c/o Natural Resources Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresourceswales.gov.uk/splash?orig=/
Cychwynnwr
Originator
  CCW Marine Monitoring Team -
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
 

Extent

Extent

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


 

Vertical Extent

Medin Extent Keyword

benthic boundary layer

Maint Fertigol
Vertical Extent

Gwerth lleiaf
Minimum value (metres)
0
Gwerth uchaf
Maximum value (metres)
-7.6
System Gyfeirio Cydlynu Fertigol
Vertical CRS
 
 

Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Documents ( )

    Specification

    [A] Reports in word and pdf format. [B] Habitat data in excel spreadsheet format. [C] Species richness data available as excel spreadsheets. [D] Pressed seaweed specimens and scanned images held as .JPGs and .TIFs. [E] Incidental video as mini dvd tapes.

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
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

Algae diversity and richness monitoring at Sarn Badrig is conducted in 2 stages. Stage 1, habitat mapping and stage 2, algal richness. The site is marked with a permanent tripod structure and provides a reference point for mapping the surrounding substrata. An area 25 m x 25 m is marked out North East of the tripod marker and at 5 m intervals a quadrat is used to record the substratum (percentage cover of sand, gravel, pebbles and boulder) and biota features (percentage cover of algal turf, presence/absenceof H.siliquosa and Laminaria spp). Also recorded is how representative the area is of the habitat MIR.HalXK. This process is repeated North West, South West and South East of the marker to form a 50 m x 50 m area with the marker in the centre. A total of 100 quadrats are completed. The area that is most representative of the habitat MIR.HalXK is selected for monitoring algal richness. Its distance and bearing from the pyramid is recorded. Due to the difficulty of identifying algae species in-situ within a limited time period, different methods of measuring species richness were investigated in 2005. In 2007, 2 divers each used a 0.25 m quadrat to record algal species, in 10 min intervals up to one hour. The quadrat is used as a tool to focus the search and is moved around the sector by the divers. Detailed methodologies can be found in Marine Monitoring Report 25b (standard operating procedures 7 and 8 for the 2005 methods). Established as Life Monitoring Trials - CCW report 380, chapter 3.1.1 Contract Science Report 380, followed by contracted Across Wales diving project. Whilst most species were identified in situ, some were gathered for subsequent laboratory analysis using algal identification keys and microscope. Samples of algae were pressed, scanned on a flat-bed colour scanner and incorporated into the CCW herbarium.
 

Keywords

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Allweddair
Keywords

NRW Thesaurus
  • marine monitoring (see also marine surveys)
  • Pen Llyn a'r Sarnau cSAC
  • community richness
  • quadrats
  • Biodiversity Action Plan (BAP)
  • Sarn Badrig Reef
  • Special Area of Conservation Monitoring
  • algae
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

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

Spatial Reference System

Code
Latitude and Longitude (EPSG::4326)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

The establishment of a programme of surveillance and monitoring for judging the condition of the features of Pen Llyn a'r Sarnau cSAC : 1. Progress to March 2001
 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
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

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© CNC/NRW 2009 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

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313130393437 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Across Wales Diving Monitoring Project (2004)

NRW_DS109743
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-09-28T14:09:37.481Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
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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