Intertidal Monitoring of Sabellaria alveolata Reefs in Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2012

Pen Llyn a'r Sarnau Special Area of Conservation (SAC) is designated for five Annex 1 habitats and four subsidiary ones, listed in Table 1. Of these, Estuaries and their constituent mudflats, sandflats and reefs, large shallow inlets and bays with intertidal Zostera beds, populations of the shingle-dwelling amphipod Pectenogammarus, piddocks in clay and lower shore boulder communities and Reefs, particularly biogenic reefs of Sabellaria alveolata; are the main habitats of interest within the intertidal areas of the SAC. Conservation objectives for these habitats are given in the Regulation 33 advice for the SAC (CCW 2009). The purpose of this data capture was to continue monitoring the intertidal area within the SAC.

Identifier: NRW_DS115332

Alternative Title

Monitro Rhynglanwol ar riffiau Sabellaria alveolata yn ACA Pen Llyn a'r Sarnau yn 2012

Metadata Language: English

Lineage: The Llandanwg and West Afon Dwyfor Sabellaria reef transects were re-surveyed in 2012, having been surveyed by ASML in 2009 and 2010. Existing 2010 maps of Sabellaria reef in these areas were used to orientate the work area in 2012. At both Llandanwg and West Afon Dwyfor the survey task was to re-survey the areas surveyed by quadrat in 2009 and 2010. The Sabellaria reef in the vicinity of the quadrat sites was also mapped from the upper limit of Sabellaria on the shore, to the lower limit of access on the shore, as dictated by the height of the low tide. The mapped areas were not as large as the 2010 areas, as the tides were not as workable in 2012. On the shore, the GPS units were used by the survey teams to navigate to the correct, central position for each quadratting area within the 'quadrat zone' described in 2009, within the Sabellaria reef. At each quadrat station, surveyors established an origin at the centre of an imaginary 20 m x 20 m grid (numbers vs letters) i.e. at location 10 'm' (= x,y) and then the surveyors proceeded to survey the initial 5 random quadrats in detail. Estimates were made of the percentage cover of standing water, total Sabellaria, live Sabellaria and a small selection of key species/taxa. Other typical fauna and flora (listed on the proforma) were then searched for and recorded. No estimation of abundance was required for these species (to speed up the recording), but rapid estimates of algal cover and other major cover organisms such as Mytilus edulis were made.

Dataset Reference Date (Publication): 2012-07-31

Temporal Extent

Begin date: 2012-07-24

End date: 2012-07-24

Topic category

Biota

Owner

Natural Resources Wales (NRW)

Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales

http://naturalresources.wales/?lang=en

Originator

Aquatic Survey and Monitoring Ltd (ASML)

Whitfield Brow, Bollihope, Frosterley, Weardale, Co. Durham, DL13 2SZ, England

http://www.marineseen.com/aquatic_survey_and_monitoring.htm

Extent

Geographic Extent: Wales (WLS)

Vertical Extent

Medin Extent Keyword: benthic boundary layer

Format Type and Description

Documents ()

Specification

[A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version. [B] Excel spreadsheets with species data from quadrat surveys. [C] Photographs of the quadrats. [D] Marine Recorder file.

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
Degree: false

Lineage: The Llandanwg and West Afon Dwyfor Sabellaria reef transects were re-surveyed in 2012, having been surveyed by ASML in 2009 and 2010. Existing 2010 maps of Sabellaria reef in these areas were used to orientate the work area in 2012. At both Llandanwg and West Afon Dwyfor the survey task was to re-survey the areas surveyed by quadrat in 2009 and 2010. The Sabellaria reef in the vicinity of the quadrat sites was also mapped from the upper limit of Sabellaria on the shore, to the lower limit of access on the shore, as dictated by the height of the low tide. The mapped areas were not as large as the 2010 areas, as the tides were not as workable in 2012. On the shore, the GPS units were used by the survey teams to navigate to the correct, central position for each quadratting area within the 'quadrat zone' described in 2009, within the Sabellaria reef. At each quadrat station, surveyors established an origin at the centre of an imaginary 20 m x 20 m grid (numbers vs letters) i.e. at location 10 'm' (= x,y) and then the surveyors proceeded to survey the initial 5 random quadrats in detail. Estimates were made of the percentage cover of standing water, total Sabellaria, live Sabellaria and a small selection of key species/taxa. Other typical fauna and flora (listed on the proforma) were then searched for and recorded. No estimation of abundance was required for these species (to speed up the recording), but rapid estimates of algal cover and other major cover organisms such as Mytilus edulis were made.

Keywords

GEMET - INSPIRE themes, version 1.0

Species distribution

Type: Theme

Citation

Date (Publication): 2008-06-01

Code: geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Keywords

NRW Thesaurus

intertidal
monitoring programmes
Pembrokeshire Marine SAC
Infauna

Type: Theme

Citation

Date (Publication): 2023-12-31

Code: geonetwork.thesaurus.local.theme.converted_nrw-keywords

Keywords

SeaDataNet Parameter Discovery Vocabulary

Zoobenthos taxonomic abundance
Zoobenthos generic abundance

Type: Theme

Citation

Date (Revision): 2021-01-06

Code: geonetwork.thesaurus.external.theme.rdf+xml

Code: Latitude and Longitude (EPSG::4326)

Content Information

NRW Profile

Custom Elements

NRW Related Title: Across Wales intertidal SAC monitoring Pen Llyn a'r Sarnau SAC : August 2008

NRW Related Title: Across Wales intertidal SAC monitoring Pen Llyn a'r Sarnau SAC July 2009

NRW Related Title: Across Wales intertidal SAC monitoring Pen Llyn a'r Sarnau SAC July 2010

NRW Related Title: Intertidal SAC monitoring Pen Llyn a'r Sarnau SAC July 2012

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 2012. 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

File Identifier: 4f4c4942-4343-5764-6473-313135333332 XML

Metadata Language: English

Parent Identifier: Across Wales Intertidal Monitoring Survey
NRW_DS109834

Resource type: Dataset

Metadata Date: 2024-12-09T12:32:46.463Z

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

Access the portal

Full access to the portal and metadata.

Intertidal Monitoring of Sabellaria alveolata Reefs in Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2012

Identification

Temporal Extent

Extent

Extent

Vertical Extent

Distribution

Quality

Data quality

Keywords

Keywords

Citation

Keywords

Citation

Keywords

Citation

Spatial Reference System

Content

Content Information

NRW Profile

Custom Elements

Constraints

Constraints

Limitations on Public Access and Use

Access Constraints Directive

Access Constraints Text

Use Constraints

Metadata

Metadata

Publishing Body