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Metadata: Macroinvertebrates in the Glaslyn / Dwyryd Estuary
Abstract:
This dataset contains the results of a macro-invertebrate survey of the Glaslyn/Dwyryd estuary undertaken in 1978 in order to better understand the ability of the estuary to receive wading birds that may be displaced by barrage construction. The purpose of this data capture was to assess the capacity of the estuary to receive wading birds that might be displaced from other estuaries on the Irish Sea flyway by barrage construction. Data capture also helped to obtain data relevant to the management of the adjacent Morfa Harlech National Nature Reserve and enabled collection of data on the marine fauna of the area.
Data holder:
Natural Resources Wales (NRW)
Click on the red button for resource contact details:
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| Other details | ||
| Internal code | Internally assigned metadata identifier | 8702 |
| 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. | Macroinvertebrates in the Glaslyn / Dwyryd Estuary |
| 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_DS111147 |
| Resource Identifier | This is the code assigned by the data owner. | 4f4c4942-4343-5764-6473-313131313437 |
| 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 | 1978-01-01 |
| End date | This describes the date the resource ends. This may only be the year if month and day are not known | 1978-03-31 |
| 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'. | notPlanned |
| Abstract | The abstract provides a clear and brief statement of the content of the resource. | This dataset contains the results of a macro-invertebrate survey of the Glaslyn/Dwyryd estuary undertaken in 1978 in order to better understand the ability of the estuary to receive wading birds that may be displaced by barrage construction. The purpose of this data capture was to assess the capacity of the estuary to receive wading birds that might be displaced from other estuaries on the Irish Sea flyway by barrage construction. Data capture also helped to obtain data relevant to the management of the adjacent Morfa Harlech National Nature Reserve and enabled collection of data on the marine fauna of the area. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | 82 sampling stations were established across the estuary. At each station five core samples were taken. Four were washed through a sieve and the portion retained was preserved in 5% formalin. These were then examined in the laboratory with the animals present counted and identified. The percentage volume of fines was also determined and a measure of organic content taken. The fifth core sample was bagged and preserved for sediment analysis. Salinity measurements of the estuary water were obtained for a high spring and a high neap tide. This forms part of a series of studies on the estuaries of Gwynedd made partly to assess their capacity to receive wading birds. |
| 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 | wading birds | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Glaslyn Dwyryd estuary | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | marine invertebrates | |
| 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 | estuaries (see also specific estuary names) | |
| 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 | Bird behaviour | |
| 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 | 52.9438305 |
| East | The eastern-most limit of the data resource in decimal degrees | -4.0466447 |
| South | The southern-most limit of the data resource in decimal degrees | 52.76673267 |
| West | The western-most limit of the data resource in decimal degrees | -4.33719025 |
| Regional sea | GWYNEDD - GWYNEDD | |
| 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 | Nature Conservancy Council (NCC) | |
| Delivery point | c/o Natural Resources Wales, Maes Y Ffynnon, Penrhosgarnedd, Bangor, LL57 2DW, Wales | |
| 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 | 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 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 1991 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. |
| https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ | ||
| Available data formats | ||
| Data format | Format in which digital data can be provided for transfer | Database |
| 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. | 1978-07-31 |
| 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 |