Intertidal Survey Mapping (phase 1) from Pen-ychain to Criccieth, Pen Llyn a'r Sarnau Special Areas of Conservation (SAC) 2010
The Habitats Directive establishes that the management of Special Areas of Conservation (SACs) should aim to achieve the favourable conservation status of habitat and species features listed within its Annex I and Annex II. For SACs in Wales, the Countryside Council for Wales (CCW) is therefore required to report on a regular basis on whether features are in favourable conservation status. The purpose of this data capture was to conduct a habitat survey of the intertidal area from Pen-ychain to Criccieth Castle on the south coast of the Llyn Peninsula. This work supported the detailed SAC monitoring program by providing a more up to date baseline survey of the intertidal area. It provided CCW with information to help deal with current and future casework in relation to coastal defence, and reporting particularly regarding BAP habitats and species of conservation concern. One such Biodiversity Action Plan (BAP) habitat are the Sabellaria alveolata reefs which are formed by the honeycomb worm Sabellaria alveolata, a polychaete which constructs tubes in tightly packed masses with a distinctive honeycomb-like appearance. These reefs can be up to 30 or even 50 cm thick and take the form of hummocks, sheets or more massive formations. Reefs are mainly found on the bottom third of the shore, but may reach mean high water of neap tides and extend into the shallow subtidal in places. The current report aims to fill these knowledge gaps for the survey area. The purpose of this data capture is to update previous intertidal mapping in the area and to specifically provide an updated extent of honeycomb worm reef Sabellaria alveolata. The specific project aims were to identify natural temporal changes that have been witnessed since the original Phase 1 Intertidal Mapping Project in 1996-1997.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS113087
- Metadata Language
- English
- Lineage
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The fieldwork phase was completed in October 2010; dates chosen due to suitably timed Low Water on spring tides. The survey was conducted by staff from Marine Ecological Solutions Ltd. and support provided by the Intertidal Ecologist at CCW. Intertidal habitat mapping methodologies were used as described in Wyn et al (2006) and using the 2004 biotope classification described in Conner et al (2004). The area was first mapped in July 1996 as part of the 10 year long CCW Phase 1 Intertidal project, that mapped Intertidal habitats for the entire coastline of Wales.
- Dataset Reference Date (Publication)
- 2011-01-31
Extent
Extent
- Geographic Extent
- GWYNEDD - GWYNEDD
))
Vertical Extent
- Medin Extent Keyword
-
benthic boundary layer
Distribution
- Format Type and Description
-
-
Geographic Information System
(
)
- Specification
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[A] Reports are held as pdf documents. [B] GIS data is held as MapInfo layers. [C] Photos are held as jpgs with accompanying photo log as excel spreadsheet. [D] Arcmap Feature Class
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Geographic Information System
(
)
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
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
- Lineage
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The fieldwork phase was completed in October 2010; dates chosen due to suitably timed Low Water on spring tides. The survey was conducted by staff from Marine Ecological Solutions Ltd. and support provided by the Intertidal Ecologist at CCW. Intertidal habitat mapping methodologies were used as described in Wyn et al (2006) and using the 2004 biotope classification described in Conner et al (2004). The area was first mapped in July 1996 as part of the 10 year long CCW Phase 1 Intertidal project, that mapped Intertidal habitats for the entire coastline of Wales.
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
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NRW Thesaurus
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- honeycomb worm
- biotopes
- Pen Llyn a'r Sarnau cSAC
- polychaete worms
- Phase 1 Habitat Survey
- intertidal
- sabellaria alveolata
- Type
- Theme
Citation
- Date (Publication)
- 2025-01-08
Keywords
-
SeaDataNet Parameter Discovery Vocabulary
- Type
- Theme
Citation
- Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
- NRW Related Title
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Intertidal survey mapping (phase 1) from Pen-ychain to Criccieth, Pen Llyn a'r Sarnau SAC
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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The following data is considered OS derived data and is therefore jointly owned by NRW and the Ordnance Survey. NRW may release, publish or disseminate this data freely; providing recipients are made aware of use restrictions (See general use restrictions).
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW and © Crown copyright 2011. All rights reserved. Natural Resources Wales, AC0000849444. Third parties seeking to re-use this data require a Licence issued by NRW. It allows re-use, reproduction and dissemination in any format or medium but only for non-commercial purposes, according to the terms and conditions of the Licence. Those seeking commercial re-use require a commercial licence available from the OS.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313133303837 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2026-03-03T12:01:30.839Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
-
1.0