© OpenStreetMap contributors
Non-native ascidians can be a major feature of sessile communities, particularly in artificial habitats, but may be overlooked because of poor understanding of speciesâ?? taxonomy and biogeographic status. The styelid unitary ascidian Asterocarpa humilis , up to now only reported in the Southern Hemisphere, has been found on the coast of NW France from St Malo to Quiberon, on the south coast of England from Falmouth to Brighton, and also in north Wales. The first documented occurrence was in 2005 in Brittany, but the species was found to be relatively widespread at a regional scale and common in many places during surveys in 2009, 2010 and 2011. It has possibly been present but overlooked for some time. The identification based on morphology was confirmed by comparison with specimens from New Zealand, within the speciesâ?? presumed native range, by molecular barcoding based on mitochondrial (COI) and nuclear (18S) genes. Publications used in this dataset include: F.Arenas et al Alien species and other notable records from a rapid assessment survey of marinas on the south coast of England J.Mar. Biol. Ass. UK. 2006, 86 1329-1337. John DD Bishop et al Surveys of marinas and harbours on the south and east coasts of England for the invasive ascidian Didemnum vexillum (October-December 2009) Internal DEFRA report. John DD Bishop et al Surveys for the invasive ascidian Didemnum vexillum in the Dart and Kingsbridge-Salcombe estuaries, Devon, in October 2009 Internal DEFRA report. John DD Bishop et alThe Southern Hemisphere ascidian Asterocarpa humilis is unrecognised but widely established in NW France and Great Britain.
Data Archive for Seabed Species and Habitats (DASSH)
Public
Other details | ||
Internal code | Internally assigned metadata identifier | 5870 |
Title | The title is used to provide a brief and precise description of the dataset such as 'Date', 'Originating organisation/programme', 'Location' and 'Type of survey'. All acronyms and abbreviations should be reproduced in full. | 2000-2012 John Bishop United Kingdom Non-Native Data |
File Identifier | The File Identifier is a code, preferably a GUID, that is globally unique and remains with the same metadata record even if the record is edited or transferred between portals or tools. | fb328ca266edbc975f78bb7b11b4cefc |
Resource Identifier | This is the code assigned by the data owner. | DASSHDT00000044 |
Resource type | The resource type will likely be a dataset but could also be a series (collection of datasets with a common specification) or a service. | dataset |
Start date | This describes the date the resource starts. This may only be the year if month and day are not known | 2000-07-13 |
End date | This describes the date the resource ends. This may only be the year if month and day are not known | 2012-12-06 |
Spatial resolution | This describes the spatial resolution of the dataset or the spatial limitations of the service. | inapplicable |
Frequency of updates | This describes the frequency with which the resource is modified or updated i.e. a monitoring programme that samples once per year has a frequency that is described as 'annually'. | notPlanned |
Abstract | The abstract provides a clear and brief statement of the content of the resource. | Non-native ascidians can be a major feature of sessile communities, particularly in artificial habitats, but may be overlooked because of poor understanding of speciesâ?? taxonomy and biogeographic status. The styelid unitary ascidian Asterocarpa humilis , up to now only reported in the Southern Hemisphere, has been found on the coast of NW France from St Malo to Quiberon, on the south coast of England from Falmouth to Brighton, and also in north Wales. The first documented occurrence was in 2005 in Brittany, but the species was found to be relatively widespread at a regional scale and common in many places during surveys in 2009, 2010 and 2011. It has possibly been present but overlooked for some time. The identification based on morphology was confirmed by comparison with specimens from New Zealand, within the speciesâ?? presumed native range, by molecular barcoding based on mitochondrial (COI) and nuclear (18S) genes. Publications used in this dataset include: F.Arenas et al Alien species and other notable records from a rapid assessment survey of marinas on the south coast of England J.Mar. Biol. Ass. UK. 2006, 86 1329-1337. John DD Bishop et al Surveys of marinas and harbours on the south and east coasts of England for the invasive ascidian Didemnum vexillum (October-December 2009) Internal DEFRA report. John DD Bishop et al Surveys for the invasive ascidian Didemnum vexillum in the Dart and Kingsbridge-Salcombe estuaries, Devon, in October 2009 Internal DEFRA report. John DD Bishop et alThe Southern Hemisphere ascidian Asterocarpa humilis is unrecognised but widely established in NW France and Great Britain. |
Lineage | Lineage includes the background information, history of the sources of data, data quality statements and methods. | The records reported here mostly arose from monitoring the sessile biota of pontoons and other submerged surfaces in marinas and harbours, either through rapid assessment surveys, or during visits to tend settlement panels, or when collecting material for population genetic studies of various species. In the UK, about sites were surveyed on the south and east coasts of England between Falmouth and Hull in the last 2â??3 years, and around 10 of these sites in SW England have been visited more frequently in connection with experimental work; this was all done from the surface (i.e. without diving). In France, 12 sites have been visited frequently since 2009 along the coast of Brittany from Lorient to St Malo as part of surveys, collecting visits and experimental work carried out both by diving and from the surface. Species have been recorded using SACFOR and presence/absence abundance units. Species not looked for or not noticed recorded as blank cells in the species matrix. Method undertaken- Rapid Assessment Survey (RAS) -This method focuses primarily on fouling organisms which live attached to solid substrates. At each marina the available floating pontoons were allocated between the 3 surveyors. Each surveyor spent 1 hour searching their allocated area, examining and scraping pontoon sides, and examining any other substrates accessible from the surface e.g. ropes, buoys, fenders, kelps etc. All 32 target NNS presence/absence were noted and abundance estimated (using an abbreviated and adapted SACFORN scale where A=SA, F=CF, R=OR, N=N). The majority of species were determined on site. Any other potential NNS, unidentified specimens, those requiring microscopical examination for species confirmation, and specimens to substantiate significant findings were relaxed, preserved and examined later in the laboratory. The specimens were relaxed using menthol crystals and preserved in 70% IDA (Industrial Denatured Alcohol) in the field. Lab ID may involve dissection for confirmation of ID. Temperature and salinity were recorded at surface and at 2m depth at each marina. |
Related keywords | ||
Keyword | General subject area(s) associated with the resource, uses multiple controlled vocabularies | Marine Environmental Data and Information Network |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Species distribution | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zoobenthos generic abundance | |
General subject area(s) associated with the resource, uses multiple controlled vocabularies | Zoobenthos taxonomic abundance | |
Geographical coverage | ||
North | The northern-most limit of the data resource in decimal degrees | 55.7572 |
East | The eastern-most limit of the data resource in decimal degrees | 2.3992 |
South | The southern-most limit of the data resource in decimal degrees | 49.8158 |
West | The western-most limit of the data resource in decimal degrees | -5.7746 |
Regional sea | Bristol Channel | |
English Channel | ||
Inner Seas off the West Coast of Scotland | ||
Irish Sea and St. George's Channel | ||
North Sea | ||
Celtic Sea | ||
VIIf | ||
VIIg | ||
IVc | ||
VIIa | ||
IVb | ||
VIa | ||
VIIe | ||
VIId | ||
littoral | ||
infralittoral | ||
Responsible organisations | ||
Role | The point of contact is person or organisation with responsibility for the creation and maintenance of the metadata for the resource. | pointOfContact |
Organisation name | Data Archive for Seabed Species and Habitats (DASSH) | |
Position name | Data Manager | |
Phone | 01752 633102 | |
Fax | 01752 633291 | |
Delivery point | Marine Biological Association of the UK, The Laboratory, Citadel Hill | |
Postal code | PL1 2PB | |
City | Plymouth | |
Role | The distributor is the person or organisation that distributes the resource. | distributor |
Organisation name | Data Archive for Seabed Species and Habitats (DASSH) | |
Position name | Data Manager | |
Phone | 01752 633102 | |
Fax | 01752 633291 | |
Delivery point | Marine Biological Association of the UK, The Laboratory, Citadel Hill | |
Postal code | PL1 2PB | |
City | Plymouth | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | Marine Biological Association of the UK (MBA) | |
Individual name | John Bishop | |
Delivery point | Citadel Hill | |
Postal code | PL1 2PB | |
City | Plymouth | |
Role | The originator is the person or organisation who created, collected or produced the resource. | originator |
Organisation name | Marine Biological Association of the UK (MBA) | |
Individual name | Chris Wood | |
Position name | Researcher | |
Delivery point | Citadel Hill | |
Postal code | PL1 2PB | |
City | Plymouth | |
Role | The custodian is the person or organisation that accepts responsibility for the resource and ensures appropriate care and maintenance. If a dataset has been lodged with a Data Archive Centre for maintenance then this organisation is be entered here. | custodian |
Organisation name | Data Archive for Seabed Species and Habitats (DASSH) | |
Position name | Data Manager | |
Phone | 01752 633102 | |
Fax | 01752 633291 | |
Delivery point | Marine Biological Association of the UK, The Laboratory, Citadel Hill | |
Postal code | PL1 2PB | |
City | Plymouth | |
Resource locators | ||
Locator URL | Web address (URL) that links to the resource | http://www.dassh.ac.uk/datasets/DASSHDT00000044 |
Locator name | Name of the web resource | Click to get data |
Locator URL | Web address (URL) that links to the resource | http://www.dassh.ac.uk |
Locator name | Name of the web resource | DASSH homepage |
Dataset constraints | ||
20 Limitations on Public Access - Access constraints | ISO restriction code chosen from ISO 19115-1 Codelist | otherRestrictions |
20 Limitations on Public Access – Other constraints | Any restriction on the use of the resource such as the need to agree to certain licence conditions. | Public |
21 Conditions for Access and Use - Use limitation | Any restrictions imposed on accessing the resource such as the need to agree to certain licence conditions. | Public |
Available data formats | ||
Data format | Format in which digital data can be provided for transfer | Delimited |
Version info | ||
Date of publication | The publication date of the resource or if previously unpublished the date that the resource was made publicly available via the MEDIN network. | 2017-12-18 |
Metadata date | The date when the content of this metadata record was last updated. | 2019-08-23 |
Metadata standard name | The name of the metadata standard used to create this metadata | MEDIN Discovery metadata standard |
Metadata standard version | The version of the MEDIN Discovery Metadata Standard used to create the metadata record | 2.3.8 |
© OpenStreetMap contributors