Intertidal Monitoring Pen Llyn a’r Sarnau Special Area of Conservation (SAC) 2013

Pen Llyn a’r Sarnau Special Area of Conservation (SAC) is designated for its 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 intertidal clay and lower shore boulder communities and reefs, particularly the biogenic reefs of Sabellaria alveolata. These features are monitored by ASML on behalf of Natural Resources Wales (NRW), which has a statutory duty to produce advice under Regulation 35 (formerly Regulation 33) of the Habitats Regulations 1994. This dataset is a compilation of a number of intertidal research and monitoring programmes conducted in 2013. This included, intertidal surveying of the honeycomb reef worm Sabellaria alveolata at West Afon Dwyfor and Llandanwg; the surveying of the population status of Pectenogammarus populations (LGS.Pec), a scarce, shingle shore specific amphipod found near Pwllheli; sediment analyses of biotopes of the Dyfi and Glaslyn/Dwyryd estuaries were conducted, and subsequently the Glaslyn/Dwyryd infaunal samples were analysed; and finally a species list was created using fixed monitoring quadrats in the upper, mid and lower shore at Porth Oer, the results of which were compared to 2012 survey results.

Identifier: NRW_DS116508

Alternative Title

Monitro rhynglanwol Ardal Cadwraeth Arbennig (ACA) Pen Llŷn a’r Sarnau 2013

Metadata Language: English

Lineage: A number of surveying techniques were used: - Intertidal reefs, characterised by biogenic reef formed by the honeycomb reef worm Sabellaria alveolata were surveyed at West Afon Dwyfor and Llandanwg with multiple quantitative quadrats. - Pectenogammarus populations (LGS.Pec), a scarce, shingle shore specific amphipod, was surveyed near Pwllheli and its abundance compared to previous years. - The sediment biotopes of the Dyfi & Glaslyn/Dwyryd estuaries were surveyed both qualitatively and quantitatively respectively. - The Dyfi sediment biotopes were assessed qualitatively in situ and quantitatively. - The Glaslyn/Dwyryd quantitative infaunal samples were analysed and a range of univariate community statistics were calculated. - The fixed monitoring quadrats in the upper, mid and lower shore stations at Porth Oer were surveyed and compared to 2012’s results. A species list was produced for the fixed monitoring quadrats.

Additional Information: Mercer, T.S. 2016. Intertidal monitoring, Pen Llyn a’r Sarnau SAC August 2013. NRW Evidence Report No. 58, pp 68 + x, Aquatic Survey & Monitoring Ltd. Harehope Quarry, Co. Durham.

Dataset Reference Date (Publication): 2016-03-31

Temporal Extent

Begin date: 2016-08-10

End date: 2016-08-10

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: Irish Sea

Geographic Extent: Cardigan Bay

Geographic Extent: Tremadog Bay

Geographic Extent: Menai Strait

Map representing the geographic extent of the dataset

Vertical Extent

Medin Extent Keyword: water column boundary layer; water column; unknown

Format Type and Description

Documents ()

Specification

Sabellaria Quadrat Data: [A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version. [B] MapInfo GIS layer in MapInfo Native format (Tables): - Position of the sample stations - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets with station details and species data [D] Photographs of the stations [E] Marine Recorder file Porth Oer Bedrock Data: [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. Dwyryd/Glaslyn sediment Data: [A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version. [B] MapInfo GIS layer in MapInfo Native format (Tables): - Position of the sample stations - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets with station details and species data [D] Photographs of the stations [E] Marine Recorder file Dyfi sediment data: [A] Digital versions of the contract report: Microsoft Word document(s); and an equivalent Adobe Portable Document Format version. [B] MapInfo GIS layer in MapInfo Native format (Tables): - Position of the sample stations - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets with station details and species data [D] Photographs of the stations [E] 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: A number of surveying techniques were used: - Intertidal reefs, characterised by biogenic reef formed by the honeycomb reef worm Sabellaria alveolata were surveyed at West Afon Dwyfor and Llandanwg with multiple quantitative quadrats. - Pectenogammarus populations (LGS.Pec), a scarce, shingle shore specific amphipod, was surveyed near Pwllheli and its abundance compared to previous years. - The sediment biotopes of the Dyfi & Glaslyn/Dwyryd estuaries were surveyed both qualitatively and quantitatively respectively. - The Dyfi sediment biotopes were assessed qualitatively in situ and quantitatively. - The Glaslyn/Dwyryd quantitative infaunal samples were analysed and a range of univariate community statistics were calculated. - The fixed monitoring quadrats in the upper, mid and lower shore stations at Porth Oer were surveyed and compared to 2012’s results. A species list was produced for the fixed monitoring quadrats.

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 biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
marine sediments (coastal sediments) (intertidal sediments) (subtidal sediments)
marine ecology (intertidal ecology)(subtidal ecology) (littoral communities) (intertidal habitat)(see also seashore)
Intertidal monitoring
seashore (intertidal) (littoral) (see also beaches)
marine wildlife (marine fauna)(marine flora)(intertidal fauna)(see also marine species,marine algae,marine mammals
marine surveys (intertidal & subtidal surveys) (littoral survey) (sublittoral surveys) (bathymetric survey) (see also marine monitoring and MNCR)
intertidal
sabellaria spinulosa
ross worm
sabellaria alveolata
polychaete worms
honeycomb worm
biotopes
sediment infauna
Infauna
mudflats
sandflats
estuarine rock

Type: Theme

Citation

Date (Publication): 2023-12-31

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

Keywords

SeaDataNet Parameter Discovery Vocabulary

Habitat extent
Habitat characterisation

Type: Theme

Citation

Date (Revision): 2021-01-06

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

Code: British National Grid (EPSG::27700)

Content Information

NRW Profile

Custom Elements

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 on this data. NRW may release, publish or disseminate it freely.

Use Constraints

Use constraints type: Other restrictions

Other constraints: © CNC/NRW Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.

Metadata

File Identifier: 4f4c4942-4343-5764-6473-313136353038 XML

Metadata Language: English

Parent Identifier: Across Wales Intertidal Monitoring Survey
NRW_DS109834

Resource type: Dataset

Metadata Date: 2024-05-31T09:27:31.043Z

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 Pen Llyn a’r Sarnau Special Area of Conservation (SAC) 2013

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