Intertidal Monitoring of Eelgrass (Zostera marina) Beds in Pen Llyn ar Sarnau Special Areas of Conservation (SACs) in 2004/2005

  • English
  • wel
  • All

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. Seagrass beds develop in intertidal and shallow subtidal areas on sands and muds. They may be found in marine inlets and bays but also in other areas, such as lagoons and channels, which are sheltered from significant wave action. Eelgrass (Zostera marina), is considered to be scarce (present in 16-100 ten km squares) is protected through the EC Habitats Directive and is classed as a UK Biodiversity Action Plan (BAP) Priority Habitat. In particular, seagrass meadows are used as a refuge area by several juvenile commercially important fish species, and similarly provide an important food source for wildfowl such as Brent geese. As a result of their dense root networks, together with a certain degree of wave attenuation and the trapping of sediment particles which further encourages sedimentation, seagrass beds help to stabilise the underlying substratum, thereby playing an important role in terms of coastal defence and the reduction of coastal erosion (Davison and Hughes, 1998). As such, in addition to their biological function and conservation importance, they are also of considerable economic importance. Human activity in the coastal zone (pollution, dredging boat mooring etc) can affect seagrass distribution or even destroy the beds completely. The purpose of this data capture was to map the current known intertidal extent of the Zostera biotope, develop a survey methodology to determine grass density, record damage to the beds caused by physical impacts, develop an index of disease and record species (epibiota) on the Zostera and adjacent sediment.

Identification

Dynodydd
Identifier
NRW_DS102010
Teitl Amgen
Alternative Title
  • 2004 CCW / IECS Pen Llyn a'r Sarnau SAC Zostera marina monitoring MRCCW3020000000D
  • 2005 CCW / IECS Pen Llyn a'r Sarnau SAC Zostera marina monitoring MRCCW3020000001A
  • Monitro Rhynglanwol: Zostera marina yn ACA Pen Llyn a'r Sarnau yn 2004/2005
Laith Metadata
Metadata Language
English
Lineage

The extent of the Zostera was mapped on foot by walking around the biotope perimeter recording the boundary position with a portable dGPS system. Representative photographs were taken throughout the survey. The density of the seagrass was measure in 2004. 12 sampling stations of 0.07m2 were chosen at random and blades/leaves within the area counted to calculate blade density per m2. dGPS positions were recorded at each site. In 2005 sample points were chosen based on a grid system with sampling carried out at 25 m intervals along transect lines 50 m apart. A GPS and photograph were taken at each point and a quadrat of 50 cm x 50 cm was used to record Zostera marina cover, cover of Enteromorpha sp and the associated faunal species and the description of substratum. Physical damage was measured using dGPS points taken where any signs of physical damage were observed and notes recorded in situ on extent and type. Zostera marina beds were mapped during the intertidal phase 1 survey during 1997 and CCW contracted IECS to follow up these records with a monitoring program.
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2008-12-31
Perchennog
Owner
  Natural Resources Wales (NRW)
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  Countryside Council for Wales (CCW)
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
Cychwynnwr
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

Hyd
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

Fformat - Math a Disgrifiad
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] MapInfo GIS layer in MapInfo Native format (Tables): - Positions of quadrats at Porth Dinllaen - 2004. - Positions of quadrats at Afon Wen and Black Rock Sands - 2005. - Translations from the above MapInfo Tables are retained in ESRI Shapefile and MapInfo Interchange formats. [C] Excel spreadsheets for quadrat, species data - 2004/5. [D] Photographs from each location and quadrat. [E] Marine Recorder file: MRCCW3020000000D, MRCCW3020000001A

 

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
Degree
false
Lineage

The extent of the Zostera was mapped on foot by walking around the biotope perimeter recording the boundary position with a portable dGPS system. Representative photographs were taken throughout the survey. The density of the seagrass was measure in 2004. 12 sampling stations of 0.07m2 were chosen at random and blades/leaves within the area counted to calculate blade density per m2. dGPS positions were recorded at each site. In 2005 sample points were chosen based on a grid system with sampling carried out at 25 m intervals along transect lines 50 m apart. A GPS and photograph were taken at each point and a quadrat of 50 cm x 50 cm was used to record Zostera marina cover, cover of Enteromorpha sp and the associated faunal species and the description of substratum. Physical damage was measured using dGPS points taken where any signs of physical damage were observed and notes recorded in situ on extent and type. Zostera marina beds were mapped during the intertidal phase 1 survey during 1997 and CCW contracted IECS to follow up these records with a monitoring program.
 

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
  • Pen Llyn a'r Sarnau SAC
  • marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore)
  • Special Areas of Conservation (SAC) - SAC monitoring
  • Porth Fechan
  • Porth Dinllaen
  • Black Rock Sands
  • zostera marina
  • eelgrass
  • seagrasses (see also potamogetonaceae and hydrocharitaceae)
  • zostera
  • posidoniaceae
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2023-12-31
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
  • Habitat extent
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Adolygu)
Date (Revision)
2021-01-06
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

NRW Related Title

Intertidal Monitoring of Zostera marina in Pen Llyn a'r Sarnau SAC in 2004/2005
 

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 2008. 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
4f4c4942-4343-5764-6473-313032303130 XML
Laith Metadata
Metadata Language
English
Parent Identifier
Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder

NRW_DS114501
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2024-12-09T12:33:47.522Z
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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