© OpenStreetMap contributors
Turbidity provides an indication of water clarity and water quality. The depth to which light can penetrate is reduced with increased turbidity, which may be the result of natural processes in coastal and estuarine waters but can also be caused by anthropogenic causes such as coastal construction and dredge spoil dumping. Curvie (Laminaria hyperborea) is known to be susceptible to the impacts of elevated turbidity levels and therefore changes in L. hyperborea can be an indicator of changes in turbidity. Grazing of L. hyperborea by the common sea urchin Echinus esculentus may also have an impact of numbers of kelp plant and therefore numbers of this species present must also be taken into consideration. The purpose of this data capture was to use depth measurements for the distribution of kelp Laminaria hyperborea as a monitoring indicator for medium/long-term changes in turbidity level. Also to measure the overall 'luxuriousness' (biomass) of the algal turf of the rocky reef. This information will assist with reporting on the favourable conservation status of reef features in Pen Llyn a'r Sarnau.
Natural Resources Wales (NRW)
There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
| Other details | ||
| Internal code | Internally assigned metadata identifier | 1828 |
| 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 of Kelp Depth as an Indication of Turbidity in Pen Llyn a'r Saranac Special Area of Conservation (SAC) |
| Alternative title | The purpose of alternative title is to record any additional names by which the dataset may be known. | Kelp monitoring at Pen Cristen, Bardsey, Kelp monitoring at St Tudwels West, Monitro dyfnder gwymon fel dynodiad o dyrfedd yn ACA Pen Llyn a'r Sarnau |
| 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. | 4f4c4942-4343-5764-6473-313131313339 |
| Resource Identifier | This is the code assigned by the data owner. | 111139 |
| 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 | 2004-05-21 |
| 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 |
| Vertical extent (min) | A positive or negative decimal number, for example, the shallowest depth recorded if subtidal, or, if intertidal, the lowest point recorded. | -5.4 |
| Vertical extent (max) | A positive or negative decimal number, for example, the deepest depth recorded if subtidal, or, if intertidal, the highest point recorded. | -10 |
| Vertical extent reference | This descibes the vertical coordinate reference system as referred to in the EPSG register of geodetic parameters. (epsg-registry.org) | urn:ogc:def:crs:EPSG:: |
| Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
| 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. | Turbidity provides an indication of water clarity and water quality. The depth to which light can penetrate is reduced with increased turbidity, which may be the result of natural processes in coastal and estuarine waters but can also be caused by anthropogenic causes such as coastal construction and dredge spoil dumping. Curvie (Laminaria hyperborea) is known to be susceptible to the impacts of elevated turbidity levels and therefore changes in L. hyperborea can be an indicator of changes in turbidity. Grazing of L. hyperborea by the common sea urchin Echinus esculentus may also have an impact of numbers of kelp plant and therefore numbers of this species present must also be taken into consideration. The purpose of this data capture was to use depth measurements for the distribution of kelp Laminaria hyperborea as a monitoring indicator for medium/long-term changes in turbidity level. Also to measure the overall 'luxuriousness' (biomass) of the algal turf of the rocky reef. This information will assist with reporting on the favourable conservation status of reef features in Pen Llyn a'r Sarnau. |
| Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | A transect is established on an unbroken slope of bedrock with a constant gradient. Permanent stations are not required. The diver records the depth (corrected for chart datum) and length of the stipe of the deepest kelp plant. Only established plants i.e. those with a stipe greater than 100mm in length are recorded. The diver swims directly upslope with a 3m pole, when 3 plants are touching the pole, the details are recorded. The diver swims upslope again until the pole is touching 6 plants, recording the details. The process is carried out at 5 transects at least 10m apart. The number of Common sea urchins Echinus esculentus occurring along the length of the transect are also recorded. Within these 3 zones (lower, middle and upper) algal turf is gathered from a 0.3m x 0.3m quadrat. Quadrats are repeated as time allows. In the lab the algae is washed and excess water removed and the wet weight recorded. The samples are then dried and the ash-free dry weight recorded. Detailed methodologies and descriptions can be found in Marine Monitoring Report 25b (standard operating procedures 10). Although sampling is repeated annually, poor weather conditions have meant that no data has been collected since 14/07/2005. In future volunteers may be used to assist with data collection. |
| 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 | Macroalgae and seagrass taxonomy-related counts | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Macroalgae generic abundance in water bodies | |
| General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network | |
| Geographical coverage | ||
| North | The northern-most limit of the data resource in decimal degrees | 52.81862619 |
| East | The eastern-most limit of the data resource in decimal degrees | -4.44190647 |
| South | The southern-most limit of the data resource in decimal degrees | 52.70674395 |
| West | The western-most limit of the data resource in decimal degrees | -4.80675103 |
| 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) | |
| Phone | 0300 065 3000 | |
| Delivery point | Maes-y-Ffynnon | |
| Postal code | LL57 2DW | |
| Role | The distributor is the person or organisation that distributes the resource. | distributor |
| Organisation name | Natural Resources Wales (NRW) | |
| Phone | 0300 065 3000 | |
| Delivery point | Maes-y-Ffynnon | |
| Postal code | LL57 2DW | |
| 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) | |
| Phone | 0300 065 3000 | |
| Delivery point | Maes-y-Ffynnon | |
| Postal code | LL57 2DW | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | Various contractors | |
| Phone | 01248 385500 | |
| Delivery point | See Natural Resources Wales, Maes y Ffynnon | |
| Postal code | LL57 2DW | |
| Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
| Organisation name | CCW Marine Monitoring Team | |
| Phone | 01248 385500 | |
| Delivery point | Countryside Council for Wales, Maes y Ffynnon | |
| Postal code | LL57 2DW | |
| Dataset constraints | ||
| Limitations on public access | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | © 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. |
| Access constraints (code) | ISO restriction code chosen from ISO 19115-1 Codelist | otherRestrictions |
| Use constraints (code) | ISO restriction name chosen from ISO 19115-1 Codelist | otherRestrictions |
| Use constraints | Any restriction on the use of the resource such as the need to agree to certain licence conditions. | There are no access restrictions to this data. NRW may release, publish or disseminate it freely. |
| 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 |
| Date of last revision | The most recent date that the resource was revised. | 2009-12-31 |
| Metadata date | The date when the content of this metadata record was last updated. | 2018-07-05 |
| Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery Metadata Standard |
| Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | Version 2.3.8 |
© OpenStreetMap contributors