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Metadata: Assessment of the Impact of Hydraulic Cockle Dredging on the Macroinvertebrate Faunas of Traeth Lafan (1993-1994)
Abstract:
This dataset contains the results of a macroinvertebrate and sediment survey conducted post hydraulic cockle dredging around Traeth Lafan, North Wales. The purpose of this data collection was to study the effects of hydraulic suction dredging on benthic invertebrate macrofaunas, substrate conformation and sediment composition on Traeth Lafan. The survey was located at Traeth Lafan, the northern entrance to the Menai Strait (Menai Strait and Colwyn Bay Special Area of Conservation (SAC)). A survey of the macroinvertebrates and sediments of Traeth Lafan, North Wales, was undertaken following extensive hydraulic cockle dredging in autumn 1993. The survey covered the site allocated for dredging and part of the hand gathering area, which was used as 'control', against which changes on the dredged ground could be compared. A follow up survey, using the same sampling grid and rationale, was carried out twelve months later, in November 1994, to ascertain the recovery state of the area after a full season's recruitment.
Data holder:
Natural Resources Wales (NRW)
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| Other details | ||
| Internal code | Internally assigned metadata identifier | 8647 |
| 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. | Assessment of the Impact of Hydraulic Cockle Dredging on the Macroinvertebrate Faunas of Traeth Lafan (1993-1994) |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | 1993-94 CCW Traeth Lafan hydraulic dredging impact survey JNCCMNCR40000693 |
| 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_DS110069 |
| Resource Identifier | This is the code assigned by the data owner. | 4f4c4942-4343-5764-6473-313130303639 |
| 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 | 1993-12-12 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 1994-12-29 |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | 4000 |
| 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. | This dataset contains the results of a macroinvertebrate and sediment survey conducted post hydraulic cockle dredging around Traeth Lafan, North Wales. The purpose of this data collection was to study the effects of hydraulic suction dredging on benthic invertebrate macrofaunas, substrate conformation and sediment composition on Traeth Lafan. The survey was located at Traeth Lafan, the northern entrance to the Menai Strait (Menai Strait and Colwyn Bay Special Area of Conservation (SAC)). A survey of the macroinvertebrates and sediments of Traeth Lafan, North Wales, was undertaken following extensive hydraulic cockle dredging in autumn 1993. The survey covered the site allocated for dredging and part of the hand gathering area, which was used as 'control', against which changes on the dredged ground could be compared. A follow up survey, using the same sampling grid and rationale, was carried out twelve months later, in November 1994, to ascertain the recovery state of the area after a full season's recruitment. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The survey consisted of a widespread survey using a grid of single sample stations and an intensive survey of four stations with replicate sampling, deployed across the dredged area. Both the single survey grid and one replicate station covered an area of 'control' ground allocated to hand gathering. 0.01m-2 x 0.2 sediment cores were collected at each sampling station and surface evidence of deeper burrowing animals was recorded. A sample was taken of the surface sediment for granulometric analysis, substrate shear strength was measured and the presence of other physical features recorded. Samples were sent to the laboratory for analysis. There is a high confidence in this data, however no spatial reference were provided with data for statistical analysis. It is assumed for the purpose of the metadata that samples were collected using Latitude and Logitude (WGS84). The post disturbance ecological survey was carried out on 12th December 2003 and 8th January 2004 with the follow up survey undertaken on the 28th and 29th of December 1994. Confidence in this dataset is high, however no spatial reference were provided with data for statistical analysis. It is assumed for the purpose of the metadata that samples were collected using Latitude and Logitude (WGS84). |
| Additional information | This describes relevant references to the data e.g. reports, articles, websites plus other useful information not captured elsewhere. | There is an associated report to accompany this dataset: P.Allen., CCW. 1995 An assessment of the impact of hydraulic cockle dredging on the macroinvertebrate faunas of Traeth Lafan, North Wales CCW Science Report No. 64. Bangor. |
| 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 | cockle dredging (hydraulic dredging) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | macroinvertebrates | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | benthic species | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Lafan sands (Lavan sands)(Traeth Lafan) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | marine and freshwater inventory | |
| 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 | Menai Strait | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Shellfish abundance and biomass in water bodies | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sedimentary structure | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Fishery characterisation | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Sediment grain size parameters | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.25916295 |
| East | The eastern-most limit of the data resource in decimal degrees | -4.00676046 |
| South | The southern-most limit of the data resource in decimal degrees | 53.24506231 |
| West | The western-most limit of the data resource in decimal degrees | -4.07804031 |
| Regional sea | benthic boundary layer | |
| SIR YNYS MON - ISLE OF ANGLESEY | ||
| 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 | North Western And North Wales Sea Fisheries Committee = Pwllgor Pysgodfeydd Mor Gogledd Orllewin Lloegr a Gogledd Cymru | |
| Delivery point | 1 Preston Street, Carnforth, Lancashire, LA5 9BY, England | |
| office@nwnwsfc.org | ||
| URL | http://www.nwnwsfc.org/ | |
| 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. CCW 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. | © CCGC/CCW 1995. 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 CCW'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. | 1995-03-31 |
| 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 | |