© OpenStreetMap contributors
- Add External Layer
- Upload Shapefile
- Layer Tutorial
- Close
Use the checkbox () to show or hide a layer.
Use the radio buttons () to select a layer to use with the identify function.
- Layers
- Opacity
Available layers
(ctrl+c)
Search for marine data across UK organisations
- API
- How-To
- About
- Contact MEDIN
- Share
Metadata: Monitoring the Health of the North Llyn Modiolus Reef
Abstract:
Modiolus Reefs are a feature of the Pen Llyn a'r Sarnau Special Area of Conservation (SAC). Information is gathered about the health of the reef through the recording of species present in fixed quadrats. Live horse mussels are hard to distinguish within the quadrat, however it is known that each live horse mussel supports one colony of the soft coral dead man's fingers Alcyonium digitatum and therefore these are used to count the number of live horse mussels present. This survey work is carried out as part of the Across Wales Diving Survey. The purpose of this data capture was to investigate the health of the reef. This contributes to reporting of favourable conservation status of the SAC feature. Data will be used in conjunction with acoustic data that looks at the extent of the feature (reef) and potential areas of damage.
Data holder:
Natural Resources Wales (NRW)
Click on the red button for resource contact details:
- Click on the red button for resource contact details
| Other details | ||
| Internal code | Internally assigned metadata identifier | 8667 |
| 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. | Monitoring the Health of the North Llyn Modiolus Reef |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Quadrat monitoring of the North Llyn horse mussel Modiolus modiolus reef |
| 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_DS110271 |
| Resource Identifier | This is the code assigned by the data owner. | 4f4c4942-4343-5764-6473-313130323731 |
| 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 | 1999-01-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2009-12-31 |
| 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'. | annually |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | Modiolus Reefs are a feature of the Pen Llyn a'r Sarnau Special Area of Conservation (SAC). Information is gathered about the health of the reef through the recording of species present in fixed quadrats. Live horse mussels are hard to distinguish within the quadrat, however it is known that each live horse mussel supports one colony of the soft coral dead man's fingers Alcyonium digitatum and therefore these are used to count the number of live horse mussels present. This survey work is carried out as part of the Across Wales Diving Survey. The purpose of this data capture was to investigate the health of the reef. This contributes to reporting of favourable conservation status of the SAC feature. Data will be used in conjunction with acoustic data that looks at the extent of the feature (reef) and potential areas of damage. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Based on the monitoring trials see Marine Monitoring Report no. 1. Two sites were set up on the N. Llyn reef in order to monitor the health of the reef. An additional site is monitored on the Isle of Man as a comparison. In 2009 several sites of good condition were identified from multibeam and side-scan sonar images for possible additional monitoring. At these sites stratified random sampling is to be undertaken rather then marking permanent quadrats.At each of the original 2 sites on the Llyn permanent markers are in place that are used to position 0.5m by 0.5m quadrats. At each site 15 quadrats are placed on the crest of a Modiolus bioherm. Each quadrat is split into 25 cells of 100x100mm. The quadrat is filmed along each row from left to right using an underwater digital camera that stores footage on mini DV tapes. Detailed information about the setting up of the sites and standard operating procedures can be found in 'CCW Marine Monitoring Report 25b (draft): SOP 3'. Still images are extracted from the video processed and stitched into a mosaic. Live horse mussels are counted using the presence of Alcyonium digitatum as an indicator. Prior to analysis the quadrats are randomised to reduce any bias from the recorder. In addition to counting the presence of horse mussels trends in other easily recognizable species can be recorded to provide additional information about the quality and health of the reef. Other species recorded are live horse mussels common starfish Asterias rubens common brittlestar Ophiothrix fragilis sea urchin Psammechinus miliaris. |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | . |
| Related keywords | ||
| Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Habitats and biotopes |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | biogenic reef | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | quadrats | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | modiolus modiolus | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | biogenic reef | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Pen Llyn a'r Sarnau cSAC | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | horse mussel | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | marine monitoring (see also marine surveys) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Habitat characterisation | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 52.94269421 |
| East | The eastern-most limit of the data resource in decimal degrees | -4.63196129 |
| South | The southern-most limit of the data resource in decimal degrees | 52.92621566 |
| West | The western-most limit of the data resource in decimal degrees | -4.66797282 |
| Regional sea | benthic boundary layer | |
| Irish Sea | ||
| Cardigan Bay | ||
| Tremadog Bay | ||
| GWYNEDD - GWYNEDD | ||
| 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 | CCW Marine Monitoring Team | |
| 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 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 2011 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. | 2009-12-31 |
| 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_DS109743 | |