Colonisation, Growth and Interactions of Carpet Sea Squirt (Didemnum vexillum)
The Carpet Sea Squirt (Didemnum vexillum) is a Invasive Non Native (INN) filter feeding marine invertebrate that forms large colonies carpetting hard structures on which it grows. Carpet Sea Squirt (Didemnum vexillum) was only confirmed in British waters in 2008. However, there are strong concerns that it will quickly colonise a much wider area as it has been found to do in other countries such as New Zealand and the USA. After an initial survey to identify the extent of colonisation, an eradication programme was undertaken by the Countryside Council for Wales. A programme of monitoring was initiated to measure the success of the eradication experiment and subsequent recolonisation and a research project undertaken in conjunction with Bangor University. The purpose of this data capture was to assess patterns of settlement, growth, colonisation and species interactions of Didemnum vexillum within Holyhead Marina from season to season. Also to look at how different disturbance magnitudes have negative or positive effects on Didemnum vexillum settlement and recruitment.
- Identification
- Extent
- Distribution
- Quality
- Keywords
- Spatial Reference System
- Content
- Constraints
- Maintenance
- Metadata
Identification
- Identifier
- NRW_DS114860
- Alternative Title
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- Ymlediad, twf ac ymarweithiad chwistrell for dorfol (Didemnum vexillum)
- Colonisation, growth and species interactions of a successful non-indigenous marine invader Didemnum vexillum.
- Metadata Language
- English
- Lineage
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Two experiments were implemented. Fixed quadrats (0.5x1m2) were set up in 2009. Disturbance quadrats (30x30cm2) were set up in 2011. Each cell was recorded using a video camera on a monthly basis. Still images of each cell were extracted from the video and the images re-sized, stretched and \stitched\" together to give and image of the full quadrat. Percentage cover of Didemnum vexillum could the be recorded along with cover of 4 key taxonomic groups (solitary ascidians; bivalves; sponges; and macroalgae). CCW have also established a temperature logger within the vicinity of the research work. The current research is written up as part of an unpublished Graduate Research project Alun G. (2012)."
- Dataset Reference Date (Publication)
- 2012-06-30
Extent
Extent
- Geographic Extent
- SIR YNYS MON - ISLE OF ANGLESEY
))
Vertical Extent
- Medin Extent Keyword
- benthic boundary layer
Vertical Extent
- Minimum value (metres)
- 0
- Maximum value (metres)
- -1
- Vertical CRS
- urn:ogc:def:datum:EPSG::5100 Sea Level depth is unadjusted and does not take into account tidal height
Distribution
- Format Type and Description
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Documents
()
- Specification
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[A] Data is held on video (mini dv) tapes with streamed clips as mpegs. [B] Images as held as tiffs. [C] Analysed data in microsoft excel spreadsheet format
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Documents
()
Quality
Data quality
- Quality Scope
- Dataset
- Lineage
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Two experiments were implemented. Fixed quadrats (0.5x1m2) were set up in 2009. Disturbance quadrats (30x30cm2) were set up in 2011. Each cell was recorded using a video camera on a monthly basis. Still images of each cell were extracted from the video and the images re-sized, stretched and \stitched\" together to give and image of the full quadrat. Percentage cover of Didemnum vexillum could the be recorded along with cover of 4 key taxonomic groups (solitary ascidians; bivalves; sponges; and macroalgae). CCW have also established a temperature logger within the vicinity of the research work. The current research is written up as part of an unpublished Graduate Research project Alun G. (2012)."
Keywords
Keywords
- Type
- Theme
Citation
- Date (Publication)
- 2008-06-01
Keywords
- NRW Thesaurus
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- invasive species (alien species)
- non-native species
- Didemnum vexillum
- colonial sea squirt
- Holyhead
- Type
- Theme
Citation
- Date (Publication)
- 2023-12-31
Keywords
- SeaDataNet Parameter Discovery Vocabulary
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- Zoobenthos taxonomic abundance
- Type
- Theme
Citation
- Date (Revision)
- 2021-01-06
Spatial Reference System
Content
Content Information
NRW Profile
Custom Elements
Constraints
Constraints
Limitations on Public Access and Use
- Restriction type
- Other restrictions
Access Constraints Directive
- Limitations
- no limitations
Access Constraints Text
- Other constraints
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This data is jointly owned by NRW and Bangor University. There are no access restrictions to this data. NRW may release, publish or disseminate it freely.
Use Constraints
- Use constraints type
- Other restrictions
- Other constraints
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© CNC/NRW and Bangor University 2012. 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 the copyright of NRW/ Bangor University 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.
Metadata
Metadata
- File Identifier
- 4f4c4942-4343-5764-6473-313134383630 XML
- Metadata Language
- English
- Resource type
- Dataset
- Metadata Date
- 2024-12-09T12:33:18.335Z
- Metadata Standard Name
- NRW
- Metadata Standard Version
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1.0