Bangor University School of Ocean Sciences (SOS) Cardigan Bay Special Area of Conservation (SAC) Towed Video Seabed Surveys (2009-2011)
Arolygon fideo llusg o wely'r môr (2009 - 2011) ACA Bae Ceredigion, Ysgol Gwyddorau Eigion Prifysgol Bangor (SOS)
The primary aim of the survey work and reports by the School of Ocean Sciences was to assess the characteristics and status of offshore benthic habitats, and primarily whether 'stony reef' habitat was present and then to assess the effects of scallop dredging on those habitats. The secondary aim of this data capture was to improve seabed habitat mapping for Cardigan Bay and assign biotopes. Surveys of seabed in Cardigan Bay Special Area of Conservation (SAC) carried out by the School of Ocean Sciences (SOS) Bangor University in 2009, 2010 and 2011.
Work included side-scan surveys (December 2009) grab sampling of sediments for particle size analysis (December 2009 and June 2010) and drop-down video and stills camera tows (all four surveys).
The drop-down imagery dataset comprises:
Survey 1 (December 2009): 72 tows (4743 stills);
Survey 2 (June 2010): 59 tows (4720 stills);
Survey 3 (December 2010): 13 tows (1364 stills);
Survey 4 (April 2011): 47 tows (5347 stills).
Video tows were approximately 10 minutes in length with still images taken every 10 seconds along the length of the tow.
The videos and still images from the first two surveys were analysed by SOS and subsequently converted by Coastal Assessment Liaison and Monitoring (CALM) to a format suitable for entry into Marine Recorder including assignment of biotopes.
The videos and still images from the last two surveys were analysed by CALM to describe habitats species and biotopes. Grab samples were taken from each site during the first two surveys but only the sediment particle size analyses data from the first survey are included in this dataset.
Sidescan survey data are not included with this dataset. The four surveys described were not directly associated with any other programme and no further work is currently planned. However it is important to note that staff in the SOS are still working on the data collected during this survey and are planning to produce publications from it.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
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DynodyddIdentifier
- NRW_DS115275
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Teitl AmgenAlternative Title
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- 2009 SOS towed video Survey of offshore habitats in the Cardigan Bay SAC (MRCCW3160000000A)
- 2010 SOS (June) towed video Survey of offshore habitats in the Cardigan Bay SAC (MRCCW3160000000C)
- 2011 SOS towed video Survey of offshore habitats in the Cardigan Bay SAC (MRCCW3160000000E)
- 2010 (December) SOS towed video Survey of offshore habitats in the Cardigan Bay SAC (MRCCW3160000000D)
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Laith MetadataMetadata Language
- English
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Lineage
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Survey platform for drop-down tows and grab sampling was SOS research vessel Prince Madog. Grab sampling was carried out with a Hamond grab and sediment samples were partly processed on-board.
As the main aim of the survey was to map areas of rocky reef, the on-board processing only weighed those fractions retained by 5 and 64 mm sieves. However, subsequent laboratory analysis of sub-samples provided particle size data on the finer fractions.
Drop-down tows were carried out with a sledge mounted video and stills camera system (models unspecified) which was towed at a speed of approx. 0.5 knots for a period of 10 minutes. Continuous video footage was recorded on DVD and the digital stills camera took a high resolution image every 10 seconds. The field of view of the video camera covered an area of approximately 0.12m2 (width 0.41m x depth 0.30m). Each still image covered an area of 0.13m2 (0.44m x 0.30m). A manual log was kept of the position and time at the start and end of transect while the camera was on the bottom.
Video and stills were analysed by marine biological surveyors to record information on habitat character, conspicuous species and their abundance. Analysis of the images from the first two surveys, by SOS staff, calculated species abundance from the number of stills in which the species was recorded and the area of seabed photographed. Analysis of the images and video from the last two surveys, by CALM staff, estimated abundance using the SACFOR abundance scale). Habitat descriptions and assignment of biotopes from the national biotope classification to each record was later carried out by CALM. Analysis included a QA process to validate and verify the recorded data.
The four surveys described were not directly associated with any other programme and no further work is currently planned. However, it is important to note that staff in the SOS are still working on the data collected during this survey, and are planning to produce publications from it.
The raw videos and images are owned by School of Ocean Sciences, University of Wales, Bangor. We are generally unable to share these with third parties to re-use or disseminate, although there may be some exceptions to this.
The raw data was analysed to create the surveys. NRW own this resultant data entered and distributed through Marine Recorder and can provide non sensitive information under an Open Government Licence. Please see the access and use restrictions for further details.
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Dyddiad cyfeirnod y set ddata (Cyhoeddiad)Dataset Reference Date (Publication)
- 2011-04-09
Temporal Extent
- Begin date
- 2009-12-11
- End date
- 2011-04-09
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Categori pwncTopic category
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BiotaBiota
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Extent
Extent
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HydGeographic Extent
- SIR CEREDIGION - CEREDIGION
))
Vertical Extent
- Medin Extent Keyword
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benthic boundary layer
Distribution
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Fformat - Math a DisgrifiadFormat Type and Description
-
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Database
(
Marine Recorder Online - Version 2.09.02
)
- Specification
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Marine Recorder
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Database
(
Marine Recorder Online - Version 2.09.02
)
Quality
Ansawdd Data
Data quality
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Cwmpas AnsawddQuality Scope
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DatasetDataset
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CydymffurfiadConformity
- Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
- Explanation
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This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
- Degree
- false
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Lineage
-
Survey platform for drop-down tows and grab sampling was SOS research vessel Prince Madog. Grab sampling was carried out with a Hamond grab and sediment samples were partly processed on-board.
As the main aim of the survey was to map areas of rocky reef, the on-board processing only weighed those fractions retained by 5 and 64 mm sieves. However, subsequent laboratory analysis of sub-samples provided particle size data on the finer fractions.
Drop-down tows were carried out with a sledge mounted video and stills camera system (models unspecified) which was towed at a speed of approx. 0.5 knots for a period of 10 minutes. Continuous video footage was recorded on DVD and the digital stills camera took a high resolution image every 10 seconds. The field of view of the video camera covered an area of approximately 0.12m2 (width 0.41m x depth 0.30m). Each still image covered an area of 0.13m2 (0.44m x 0.30m). A manual log was kept of the position and time at the start and end of transect while the camera was on the bottom.
Video and stills were analysed by marine biological surveyors to record information on habitat character, conspicuous species and their abundance. Analysis of the images from the first two surveys, by SOS staff, calculated species abundance from the number of stills in which the species was recorded and the area of seabed photographed. Analysis of the images and video from the last two surveys, by CALM staff, estimated abundance using the SACFOR abundance scale). Habitat descriptions and assignment of biotopes from the national biotope classification to each record was later carried out by CALM. Analysis included a QA process to validate and verify the recorded data.
The four surveys described were not directly associated with any other programme and no further work is currently planned. However, it is important to note that staff in the SOS are still working on the data collected during this survey, and are planning to produce publications from it.
The raw videos and images are owned by School of Ocean Sciences, University of Wales, Bangor. We are generally unable to share these with third parties to re-use or disseminate, although there may be some exceptions to this.
The raw data was analysed to create the surveys. NRW own this resultant data entered and distributed through Marine Recorder and can provide non sensitive information under an Open Government Licence. Please see the access and use restrictions for further details.
Keywords
Allweddair
Keywords
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2008-06-01
Allweddair
Keywords
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NRW Thesaurus
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- benthic marine habitats
- Marine Recorder
- Video survey
- Sediment PSA
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MathType
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ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2026-10-28
Allweddair
Keywords
-
MathType
-
ThemeTheme
Dyfyniad
Citation
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Dyddiad (Cyhoeddiad)Date (Publication)
- 2024-06-19
Spatial Reference System
Content
Gwybodaeth Cynnwys
Content Information
Proffil CNC
NRW Profile
Elfennau CNC
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
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Math o GyfyngiadRestriction type
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Other restrictionsOther restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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The raw data is wholly owned by School of Ocean Sciences, Bangor University and provided to NRW for collation into our marine archive. There are no access restrictions on this data. NRW may release, publish or disseminate it freely.
Use Constraints
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Cyfyngiadau DefnyddioUse constraints type
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Other restrictionsOther restrictions
- Other constraints
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© CNC/NRW & © School of Ocean Sciences, Bangor University
NRW owns the copyright of the collation, but the ownership of the records themselves rests with the originator.
Data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose.
Attribution Statement
- Other constraints
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Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved.
Licence
- Other constraints
- Open Government Licence
Metadata
Metadata
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Dynodydd FfeilFile Identifier
- 4f4c4942-4343-5764-6473-313135323735 XML
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Laith MetadataMetadata Language
- English
- Parent Identifier
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Natural Resources Wales (NRW) Marine Benthic Species and Habitat Collation Held in Marine Recorder
NRW_DS114501
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Math o adnoddResource type
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DatasetDataset
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Dyddiad MetadataMetadata Date
- 2026-10-30T11:11:22.25Z
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Enw Safonol MetadataMetadata Standard Name
- NRW
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Fersiwn MetadataMetadata Standard Version
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1.0