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Metadata: Shellfish Stocks, Oystercatcher and Knot (bird) Modelling Data for the Dee Estuary, Traeth Lafan and the Burry Inlet and Three Rivers, Phase 1 (1993-2001)
Abstract:
The Dee, Traeth Lafan and Burry Inlet are designated Special Protection Areas (SPAs) for nationally and internationally important populations of wintering wildfowl and waders. In order to set conservation objectives and assess the sites for Favourable Conservation Status, information is required on numbers of birds using the sites and the food supplies they require to survive the winter and attain adequate body condition for Spring Migration. The three SPAs also support economically important cockle fisheries that may affect oystercatchers directly, by removing some of the food available to them and, indirectly, by displacing them from the best cockle beds to less suitable feeding areas. This is phase 1 of the project that will assess and use existing data to run an Individual Behaviour-based Model (IBM) to answer key questions relating to target setting, condition monitoring and management of each of the three sites. There were two main objectives to the project. The first to assess the power of existing surveys to detect change in the cockle populations at each site and recommend possible improvements. The second objective was to determine how each site was used by the populations of oystercatchers that roosted there. The models can be used to establish the target baseline quality habitats in terms of invertebrate populations but also in terms of the ability of the site to support the bird populations for which it was designated and therefore establish parameters for longer term monitoring and to establish whether it is in favourable conservation status.
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 | 8610 |
| 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. | Shellfish Stocks, Oystercatcher and Knot (bird) Modelling Data for the Dee Estuary, Traeth Lafan and the Burry Inlet and Three Rivers, Phase 1 (1993-2001) |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Marine monitoring project: Modelling oystercatchers and their food on the Dee estuary, Traeth Lafan and Burry Inlet SPA to inform target setting and site management (phase 1). |
| 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_DS109823 |
| Resource Identifier | This is the code assigned by the data owner. | 4f4c4942-4343-5764-6473-313039383233 |
| 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 | 1986-04-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2001-02-28 |
| 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 Dee, Traeth Lafan and Burry Inlet are designated Special Protection Areas (SPAs) for nationally and internationally important populations of wintering wildfowl and waders. In order to set conservation objectives and assess the sites for Favourable Conservation Status, information is required on numbers of birds using the sites and the food supplies they require to survive the winter and attain adequate body condition for Spring Migration. The three SPAs also support economically important cockle fisheries that may affect oystercatchers directly, by removing some of the food available to them and, indirectly, by displacing them from the best cockle beds to less suitable feeding areas. This is phase 1 of the project that will assess and use existing data to run an Individual Behaviour-based Model (IBM) to answer key questions relating to target setting, condition monitoring and management of each of the three sites. There were two main objectives to the project. The first to assess the power of existing surveys to detect change in the cockle populations at each site and recommend possible improvements. The second objective was to determine how each site was used by the populations of oystercatchers that roosted there. The models can be used to establish the target baseline quality habitats in terms of invertebrate populations but also in terms of the ability of the site to support the bird populations for which it was designated and therefore establish parameters for longer term monitoring and to establish whether it is in favourable conservation status. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The Centre for Ecology and Hydrology (CEH) developed and tested and an Individual Behaviour-based Model (IBM) that predicts the effects of changes in the food supply and the amount of disturbance on the body condition and the over-winter survival rate of the oystercatchers. The model requires information on bird foraging behaviour together with site-specific data on bird numbers, and the size and distribution of cockle and mussel stocks. Cockle data was collated from the Environment Agency (EA), North West and North Wales Sea Fisheries Committee (NW and NWSFC), Centre for Environment, Fisheries and Aquaculture Science (CEFAS). Bird data was collated from the British Trust for Ornithology (BTO). Other information required to run the model, includes details of ash free weight, tide times, mean daily temperature and information on shellfish disturbance from the fisheries. Cockle counts: Dee estuary, Traeth Lafan, Burry inlet, Wales Oystercatcher counts: Dee estuary, Traeth Lafan, Burry Inlet, Alt Estuary, Mersey Estuary, Morecambe Bay, Ribble Estuary Cockle data from the Dee Estuary 1997-2002 Cockle data from Traeth Lafan 1994 - 2000 Cockle data from Burry Inlet 1993 - 2001 Oystercatcher counts (and counts for other bird species) Apr 1986 - Feb 2001 (monthly) |
| 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 | haematopus ostralegus | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | unionidae | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Burry Inlet | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | shellfish | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | cockles | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | cockle beds | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Dee estuary | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Mersey estuary | |
| 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 | mussels | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | common mussel | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Morecambe Bay | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | mytilus edulis | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Ribble estuary | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | mussel beds | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | oystercatchers | |
| 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 | Special Protection Areas (SPAs) (see also proposed Special Protection Area pSPA) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | cerastoderma edule (previously known as cardium edule) | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | environmental modelling | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Bird taxonomy-related abundance per unit area of surface | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Shellfish abundance and biomass in water bodies | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 53.513067 |
| East | The eastern-most limit of the data resource in decimal degrees | -2.608865 |
| South | The southern-most limit of the data resource in decimal degrees | 51.240829 |
| West | The western-most limit of the data resource in decimal degrees | -5.777741 |
| 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 | Various | |
| Delivery point | Enquiries Unit, Maes y Fynnon, 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 originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | British Trust for Ornithology (BTO) | |
| Delivery point | The Nunnery, Thetford, Norfolk, IP24 2PU, England | |
| info@bto.org | ||
| URL | http://www.bto.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. 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 2003 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. | 2003-04-01 |
| 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 |