Colonisation, Growth and Interactions of Carpet Sea Squirt (Didemnum vexillum)
Ymlediad, twf ac ymarweithiad chwistrell for dorfol (Didemnum vexillum)

  • English
  • wel
  • All

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

Dynodydd
Identifier
NRW_DS114860
Teitl Amgen
Alternative Title
  • Colonisation, growth and species interactions of a successful non-indigenous marine invader Didemnum vexillum.
Laith Metadata
Metadata Language
English
Lineage

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 The current research is written up as part of an unpublished Graduate Research project Alun G. (2012)."
Dyddiad cyfeirnod y set ddata (Cyhoeddiad)
Dataset Reference Date (Publication)
2012-06-30
Perchennog
Owner
  University of Wales, Bangor. School of Ocean Sciences -
Bangor, Gwynedd, LL57 2DG
http://www.bangor.ac.uk
Perchennog
Owner
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
Cychwynnwr
Originator
  CCW Marine Monitoring Team -
Countryside Council for Wales, Maes y Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW
http://naturalresourceswales.gov.uk/splash?orig=/
 

Extent

Extent

Hyd
Geographic Extent
SIR YNYS MON - ISLE OF ANGLESEY
N
W
E
S
Map representing the geographic extent of the dataset


 

Vertical Extent

Medin Extent Keyword
benthic boundary layer
 
 

Distribution

Dosbarthiad
Distribution

Fformat - Math a Disgrifiad
Format Type and Description
  • Movie ( )

    Specification

    Data is held on video (mini dv) tapes with streamed clips as mpegs.

  • Image ( )

    Specification

    Images as held as tiffs.

  • Delimited ( )

    Specification

    Analysed data in microsoft excel spreadsheet format

 

Quality

Ansawdd Data
Data quality

Cwmpas Ansawdd
Quality Scope
Dataset
Dataset
Cydymffurfiad
Conformity
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

This dataset has not been assessed for conformance to the referenced INSPIRE regulation.
Degree
false
Lineage

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

Allweddair
Keywords

GEMET - INSPIRE themes, version 1.0
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2008-06-01
Code
geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme

Allweddair
Keywords

NRW Thesaurus
  • colonial sea squirt
  • non-native species
  • Didemnum vexillum
  • invasive species (alien species)
  • Holyhead
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2025-01-08
Code
geonetwork.thesaurus.local.theme.converted_nrw-keywords

Allweddair
Keywords

SeaDataNet Parameter Discovery Vocabulary
Math
Type
Theme
Theme

Dyfyniad
Citation

Dyddiad (Cyhoeddiad)
Date (Publication)
2024-06-19
Code
geonetwork.thesaurus.external.theme.rdf+xml
 

Spatial Reference System

Code
British National Grid (EPSG::27700)
 

Content

Gwybodaeth Cynnwys
Content Information

Proffil CNC
NRW Profile

Elfennau CNC
Custom Elements

 

Constraints

Constraints

Limitations on Public Access and Use

Math o Gyfyngiad
Restriction type
Other restrictions
Other restrictions
 

Access Constraints Directive

Limitations
no limitations
 

Access Constraints Text

Other constraints

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

Cyfyngiadau Defnyddio
Use constraints type
Other restrictions
Other restrictions
Other constraints

© 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.
 

Attribution Statement

Other constraints

© CNC/NRW and Bangor University 2012
 

Licence

Other constraints
Open Government Licence
 
 
 

Metadata

Metadata

Dynodydd Ffeil
File Identifier
4f4c4942-4343-5764-6473-313134383630 XML
Laith Metadata
Metadata Language
English
Math o adnodd
Resource type
Dataset
Dataset
Dyddiad Metadata
Metadata Date
2026-03-03T12:28:05.728Z
Enw Safonol Metadata
Metadata Standard Name
NRW
Fersiwn Metadata
Metadata Standard Version

1.0

Pwynt Cyswllt
pointOfContact
  Natural Resources Wales (NRW) -
Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales
http://naturalresources.wales/?lang=en
 
 

Publishing Body

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