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Metadata: Acoustic Monitoring of South Llyn (East of the Tudwels) and Subsequent Infauna Sampling
Abstract:
A side-scan sonar survey was carried out in Tremadog Bay following reports of possible scallop dredging within the Sea Fisheries Scallop Exclusion Zone. The acoustic survey was followed up by infaunal sampling to look at the effect of disturbance of the substrata within the area. The purpose of this data capture was to investigate reports of possible scallop dredging within the Exclusion Zone and its effects on biodiversity within the Special Area of Conservation (SAC) and Exclusion Zone. Confidence in this dataset is high. The side-scan data is processed to reduce errors (e.g. positional corrections).
Data holder:
Natural Resources Wales (NRW)
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| Other details | ||
| Internal code | Internally assigned metadata identifier | 8694 |
| 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. | Acoustic Monitoring of South Llyn (East of the Tudwels) and Subsequent Infauna Sampling |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Side-scan survey of South Llyn |
| 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_DS110872 |
| Resource Identifier | This is the code assigned by the data owner. | 4f4c4942-4343-5764-6473-313130383732 |
| 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 | 2009-06-09 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2009-08-31 |
| 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'. | asNeeded |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | A side-scan sonar survey was carried out in Tremadog Bay following reports of possible scallop dredging within the Sea Fisheries Scallop Exclusion Zone. The acoustic survey was followed up by infaunal sampling to look at the effect of disturbance of the substrata within the area. The purpose of this data capture was to investigate reports of possible scallop dredging within the Exclusion Zone and its effects on biodiversity within the Special Area of Conservation (SAC) and Exclusion Zone. Confidence in this dataset is high. The side-scan data is processed to reduce errors (e.g. positional corrections). |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | Side scan-sonar data was captured from Countryside Council for Wales' (CCW) research vessel (R.V. Pedryn) using a CMAX CM800 side-scan sonar. Two areas were selected for infaunal sampling. A control site (with no dredge activity) and one area where there was evidence of recent dredge activity. Infaunal sampling was carried by divers using a 0.1 m2 quadrat. 5 Quadrats were randomly placed in the belly of a dredge scar and 5 within the control site. Surface material was collected by hand and a diver operated suction sampler was used to remove the sediment within the quadrat to a depth of 20cms using a 0.5mm filter mesh bag. Large cobbles within the sediment too big for sampler were removed by hand and placed in a large 0.5mm mesh sample bag along with the plastic bag containing surface cobbles and the suction sampler filter bag. A sediment sample was collected by the diver adjacent to the quadrat using a 1/2litre sealed plastic bucket for granulometry. The contents of the suction sample filter bag and cobbles from within the sediment were transferred to sample buckets on the surface and fixed in 20% formalin diluted with seawater. In addition one 2x2 m quadrat was photographed in 40 cm blocks at both the control site and within one dredge scar. Photos will be stitched together to create a photographic mosaic of the quadrat. |
| 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 | Species distribution | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | acoustic remote sensing | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | sediment epifauna | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | sediment infauna | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | sediment sample | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Infauna | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | sidescan sonar | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | acoustic observation (acoustic monitoring) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | benthic environment | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Tremadog Bay | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | benthic communities | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | surveillance | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | marine sediments (coastal sediments) (intertidal sediments) (subtidal sediments) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | cockle dredging (hydraulic dredging) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zoobenthos taxonomy-related counts | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zoobenthos generic abundance | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zoobenthos taxonomic abundance | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 52.868869 |
| East | The eastern-most limit of the data resource in decimal degrees | -4.341929 |
| South | The southern-most limit of the data resource in decimal degrees | 52.794113 |
| West | The western-most limit of the data resource in decimal degrees | -4.499425 |
| Regional sea | benthic boundary layer | |
| Irish Sea | ||
| 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 2009 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. All intellectual property rights (including copyright and database rights) are owned by CCW, except video footage taken by Paul Kay. Applicants seeking to re-use this material should approach Paul Kay directly to obtain permission. |
| 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. | 2009-08-31 |
| Harvest date | The date which this record has been (re)harvested from the provider. | 2026-04-12 |
| 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 |