Intertidal Monitoring of Pectenogammarus planicrurus in Cardigan Bay and Pen Llyn ar Sarnau Special Area of Conservation (SAC) 2004

There were numerous aims of this data capture. - To establish the presence and extent of Pectenogammarus planicrurus at two sites where it had previously been found. - To establish whether the amphipod was restricted to a localised habitat at the sites or whether it was present along the entire length of the shoreline, identify and map its presence and extent along the surf zone, estimate its abundance. - To take representative core samples for enumeration of P. planicrurus and Particle Size Analysis across the full extent of the biotope. The results of a Pectenogammarus planicrurus monitoring programme carried out at two sites- Pwllheli, Pen Llyn a'r Sarnau Special Area of Conservation (SACs) and Gilfach yr Halen, Cardigan Bay Special Area of Conservation (SACs). P. planicrurus had previously been found at these sites during Phase 1 surveys undertaken by Countryside Council for Wales (CCW) so the data collected contributed to an investigation into their continuing existence. P. planicrurus is the only amphipod which is a permanent resident of shingle beaches and is found in the intertidal zone of clean shingle beaches, often in the lee of obstacles such as rocky outcrops and groynes.

Identification

Identifier
NRW_DS101994
Alternative Title
  • 2004 CCW / IECS Pen Llyn a'r Sarnau SAC Pectenogammarus planicrurus monitoring (MRCCW3020000000C)
Metadata Language
English
Lineage

Pwllheli: Survey was undertaken by working two hours either side of low water with part of the survey on foot and part using a quad bike (distribution of the amphipod was more extensive than previously thought so use of a quad bike enabled sampling across the full extent of the beach within a single tidal window). Initial surveying aimed to establish the presence/absence of the species throughout the site and involved randomly chosen sample stations along the surf line (position of each station recorded using dGPS). At each station a shallow trough was dug and the number of P. planicrurus estimated using MNCR SACFOR abundance scales adapted for crustacea. Small amount of sediment was sieved as a secondary check if P. planicrurus not immediately visible. Sediment particle size and infaunal samples were taken away for analysis. Gilfach Yr Halen: Survey was undertaken on foot working two hours either side of low water. Sampling stations were located approx every 10m along edge of the surf zone (position of each station recorded using dGPS). Sediment type was noted at each station and where possible a shallow trough was dug to enumerate any P. planicrurus identified. When digging a trough was not possible (on mixed hard substrata) the under cobble/boulder, and fucoid habitats were examined.
Dataset Reference Date (Publication)
2008-12-31

Temporal Extent

Begin date
2003-09-04
End date
2009-07-04
 
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=/
Originator
  Hull University. Institute Of Estuarine And Coastal Studies -
The University of Hull, Cottingham Road, Hull, HU6 7RX
http://www.hull.ac.uk/iecs/
 

Extent

Extent

Geographic Extent
Caernarvonshire (49)
Geographic Extent
Merionethshire (48)
Geographic Extent
SIR CEREDIGION - CEREDIGION
Geographic Extent
Wales (WLS)
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
benthic boundary layer
 
 

Distribution

Format Type and Description
  • Database ( Marine Recorder Online - Version 2.09.02 )

    Specification

    Marine Recorder

 

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

Pwllheli: Survey was undertaken by working two hours either side of low water with part of the survey on foot and part using a quad bike (distribution of the amphipod was more extensive than previously thought so use of a quad bike enabled sampling across the full extent of the beach within a single tidal window). Initial surveying aimed to establish the presence/absence of the species throughout the site and involved randomly chosen sample stations along the surf line (position of each station recorded using dGPS). At each station a shallow trough was dug and the number of P. planicrurus estimated using MNCR SACFOR abundance scales adapted for crustacea. Small amount of sediment was sieved as a secondary check if P. planicrurus not immediately visible. Sediment particle size and infaunal samples were taken away for analysis. Gilfach Yr Halen: Survey was undertaken on foot working two hours either side of low water. Sampling stations were located approx every 10m along edge of the surf zone (position of each station recorded using dGPS). Sediment type was noted at each station and where possible a shallow trough was dug to enumerate any P. planicrurus identified. When digging a trough was not possible (on mixed hard substrata) the under cobble/boulder, and fucoid habitats were examined.
 

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 Recorder
  • NI biotope Pectenogammarus
  • Pen Llyn a'r Sarnau SAC
Type
Theme

Citation

Date (Publication)
2026-10-19
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
British National Grid (EPSG::27700)
 

Content

Content Information

NRW Profile

Custom Elements

NRW Related Title

Intertidal monitoring of pectenogammarus planicrurus in Cardigan Bay and Pen Llyn ar Sarnau SACs in 2004
 

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 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.
 

Attribution Statement

Other constraints

Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

File Identifier
4f4c4942-4343-5764-6473-313031393934 XML
Metadata Language
English
Parent Identifier
Across Wales Intertidal Monitoring Survey

NRW_DS109834
Resource type
Dataset
Metadata Date
2026-10-20T12:26:17.186Z
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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