ICES Metadata Catalogue
Plymouth Sound and Estuaries SAC Seagrass Condition Assessment 2012
This map is the result of a combination of drop-down/towed video (DDTV) and diver surveys were carried out on the seagrass beds within Plymouth Sound SAC. The DDTV surveys were carried out by Ecospan Environmental Ltd, and the diver surveys by Natural England. The principal aim of the surveys was to obtain standardised biological information for the seagrass beds within the SAC, and to compare these data with previous studies (where possible) for the purpose of condition monitoring of the seagrass sub-feature. An additional objective was to review DDTV and diving methods in order to assess the feasibility of using only one method in future condition assessments. The study was also intended as a pilot for a standardised monitoring protocol for assessing the density of Zostera marina under the requirements of the Water Framework Directive.
Simple
- Alternate title
-
GB100264
- Date (Creation)
- 2015-12-17
- Citation identifier
- 6d981e70-d15e-4649-ab14-716cd992c387
- Point of contact
-
Organisation name Individual name Electronic mail address Role Natural England
MarineGIData@naturalengland.org MarineGIData@naturalengland.org.uk
Owner
- Access constraints
- Other restrictions
- Other constraints
- no limitations to public access
- Use constraints
- Other restrictions
- Other constraints
-
Available under the Creative Commons Attribution (CC-BY) License v4.0
- Spatial representation type
- Vector
- Denominator
- 45000
- Language
- English
- Topic category
-
- Biota
- Oceans
))
- Begin date
- 2012-08-29
- End date
- 2012-09-17
- Reference system identifier
- http://www.opengis.net/def/crs/EPSG/0/3857
- Distribution format
-
Name Version ESRI Shapefile
1
GML
3.2.1
- OnLine resource
-
Protocol Linkage Name OGC:WMS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_view_maplibrary/wms gb100264
OGC:WFS
https://ows.emodnet-seabedhabitats.eu/geoserver/emodnet_open_maplibrary/wfs gb100264
WWW:DOWNLOAD-1.0-http--download
https://files.emodnet-seabedhabitats.eu/data/EMODnetSBHsurvey_GB100264.zip EMODnet Seabed Habitats static download
- Hierarchy level
- Dataset
Conformance result
- Date (Publication)
- 2010-12-08
- Explanation
-
This data set is conformant with the INSPIRE Implementing Rules for the interoperability of spatial data sets and services
- Pass
- Yes
- Statement
-
All of the known seagrass beds were surveyed using drop-down/towed video (DDTV) methods. The surveys were carried out between the 29th of August and 17th of September 2012. The surveys were undertaken using an adaptation of the towed video technique. In this technique an underwater video camera and lights were attached under a heavy lead fish in such a way that the camera pointed just forward of the vertical. The fish was then towed slowly (< 1 knot) above the seabed at the required depth principally to determine the percentage cover of seagrass. The percentage cover was assessed at the greatest possible resolution, but to facilitate spatial and temporal comparisons of the data, percentage cover data was subsequently aggregated into broader categories (see Table 4). The presence of macroalgae, anthropogenic influences and invasive species (Sargassum muticum) was also determined. The height of the camera above the seabed was adjusted according to the underwater visibility. The camera was deployed from Ecospans 7.9m MCA Cat. 3 coded catamaran Coastal Surveyor. The position of the camera was determined using standard survey software linked to a survey quality differential GPS (Hemisphere R320) which gives sub-metre accuracy.This map was formatted by JNCC to meet the Data Exchange Format v4.1 and translated into EUNIS 2007 in February 2024.
Metadata
- File identifier
- 6d981e70-d15e-4649-ab14-716cd992c387 XML
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2024-03-26T10:36:00.138Z
- Metadata author
-
Organisation name Individual name Electronic mail address Role JNCC
emodnetseabedhabitats@jncc.gov emodnetseabedhabitats@jncc.gov.uk
Point of contact
Overviews
Spatial extent
Provided by
