4f4c4942-4343-5764-6473-313131313339
eng
dataset
Natural Resources Wales (NRW)
0300 065 3000
Maes-y-Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
pointOfContact
2018-07-05
MEDIN Discovery Metadata Standard
Version 2.3.8
urn:ogc:def:crs:EPSG::UTM WGS84
OGP
Monitoring of Kelp Depth as an Indication of Turbidity in Pen Llyn a'r Saranac Special Area of Conservation (SAC)
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
2009-12-31
publication
2009-12-31
revision
111139
https://naturalresources.wales
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 distribu
tion 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)
0300 065 3000
Maes-y-Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
custodian
Various contractors
01248 385500
See Natural Resources Wales
Maes y Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
originator
CCW Marine Monitoring Team
01248 385500
Countryside Council for Wales
Maes y Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
originator
annually
Documents
Species distribution
GEMET - INSPIRE themes, version 1.0
2022-02-05
publication
Macroalgae and seagrass taxonomy-related counts
Macroalgae generic abundance in water bodies
SeaDataNet Parameter Discovery Vocabulary
2011-03-25
publication
Marine Environmental Data and Information Network
© 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.
otherRestrictions
There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
eng
biota
SeaVoX Vertical Co-ordinate Coverages
2010-05-18
publication
benthic boundary layer
-4.80675103
-4.44190647
52.70674395
52.81862619
2004-05-21
2009-12-31
-5.4
-10
Natural Resources Wales (NRW)
0300 065 3000
Maes-y-Ffynnon
LL57 2DW
enquiries@naturalresourceswales.gov.uk
distributor
dataset
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 gather
ed 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.