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Metadata: Intertidal Monitoring of Eelgrass (Zostera marina) Beds in Pen Llyn ar Sarnau Special Areas of Conservation (SACs) in 2004/2005
Abstract:
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.
Data holder:
Natural Resources Wales (NRW)
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| Other details | ||
| Internal code | Internally assigned metadata identifier | 8580 |
| Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | Intertidal Monitoring of Eelgrass (Zostera marina) Beds in Pen Llyn ar Sarnau Special Areas of Conservation (SACs) in 2004/2005 |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | 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 |
| File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | NRW_DS102010 |
| Resource Identifier | This is the code assigned by the data owner. | 4f4c4942-4343-5764-6473-313032303130 |
| Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
| Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2004-07-06 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2005-08-07 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 50 |
| Spatial resolution unit | This describes the unit of spatial resolution which for distance must be metres. | urn:ogc:def:uom:EPSG::9001 |
| Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | 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. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | 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. |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Species distribution |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | eelgrass | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Porth Dinllaen | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | marine biology (subtidal biology) (littoral biology) (sublittoral biology)(intertidal biology)(see also seashore) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | seagrasses (see also potamogetonaceae and hydrocharitaceae) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Special Areas of Conservation (SAC) - SAC monitoring | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Porth Fechan | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Black Rock Sands | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | zostera marina | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | posidoniaceae | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Pen Llyn a'r Sarnau SAC | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | zostera | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Habitat extent | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.04936224 |
| East | The eastern-most limit of the data resource in decimal degrees | -3.98916111 |
| South | The southern-most limit of the data resource in decimal degrees | 52.2624067 |
| West | The western-most limit of the data resource in decimal degrees | -4.74780083 |
| Regional sea | benthic boundary layer | |
| Wales (WLS) | ||
| Responsible organisations | ||
| Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Role | The owner is the person or organisation that owns the resource. | owner |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Countryside Council for Wales (CCW) | |
| Delivery point | Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresourceswales.gov.uk/splash?orig=/ | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Hull University. Institute Of Estuarine And Coastal Studies | |
| Delivery point | The University of Hull, Cottingham Road, Hull, HU6 7RX | |
| iecs@hull.ac.uk | ||
| URL | http://www.hull.ac.uk/iecs/ | |
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Natural Resources Wales (NRW) | |
| Delivery point | Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales | |
| enquiries@naturalresourceswales.gov.uk | ||
| URL | http://naturalresources.wales/?lang=en | |
| Dataset constraints | ||
| 20.1 Limitations on Public Access - Access constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 20.2 Limitations on Public Access - Other constraints | This states any limitations on access to the data. Multiple occurences are allowed here. One entry shall be from the INSPIRE Metadata registry and the other free text should be part of the resource `Have specific limitations`. | There are no access restrictions to this data. NRW may release, publish or disseminate it freely. |
| no limitations | ||
| 21.1 Conditions for Access and Use - Use constraints | This states `otherRestrictions` from ISO vocabulary RestrictionCode and is an INSPIRE/GEMINI requirement. | otherRestrictions |
| 21.2 Conditions for Access and Use - Other constraints | This states any constraints on use of the data. Multiple conditions can be recorded for different parts of the data resource. If no conditions apply, then `No condtions apply` is recorded. This uses free text. | © 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. |
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | Documents |
| Version info | ||
| Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2008-12-31 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-19 |
| Metadata date | The date when the content of this metadata record was last updated. | 2026-03-03 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 3.1.2 |
| Metadata parent | NRW_DS114501 | |