fb328ca266edbc975f78bb7b11b4cefc English dataset Data Archive for Seabed Species and Habitats (DASSH) Data Manager 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk pointOfContact 2019-08-23 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::4326 2000-2012 John Bishop United Kingdom Non-Native Data 2017-12-18 publication DASSHDT00000044 http://www.dassh.ac.uk Non-native ascidians can be a major feature of sessile communities, particularly in artificial habitats, but may be overlooked because of poor understanding of species’ 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 species’ 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. John Bishop Marine Biological Association of the UK (MBA) Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk originator Chris Wood Marine Biological Association of the UK (MBA) Researcher Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk originator Data Archive for Seabed Species and Habitats (DASSH) Data Manager 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk custodian notPlanned Delimited Documents Marine Environmental Data and Information Network Species distribution GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Zoobenthos generic abundance Zoobenthos taxonomic abundance SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision Public otherRestrictions Public English biota International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation Bristol Channel International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation English Channel International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation Inner Seas off the West Coast of Scotland International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation Irish Sea and St. George's Channel International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation North Sea International Hydrographic Bureau, Limits of Oceans and Seas 1954-01-01 creation Celtic Sea ICES Statistical Areas 2014-05-16 creation VIIf ICES Statistical Areas 2014-05-16 creation VIIg ICES Statistical Areas 2014-05-16 creation IVc ICES Statistical Areas 2014-05-16 creation VIIa ICES Statistical Areas 2014-05-16 creation IVb ICES Statistical Areas 2014-05-16 creation VIa ICES Statistical Areas 2014-05-16 creation VIIe ICES Statistical Areas 2014-05-16 creation VIId SeaDataNet vertical extent keywords 2010-01-01 revision littoral SeaDataNet vertical extent keywords 2010-01-01 revision infralittoral -5.7746 2.3992 49.8158 55.7572 2000-07-13 2012-12-06 Data Archive for Seabed Species and Habitats (DASSH) Data Manager 01752 633102 01752 633291 Marine Biological Association of the UK, The Laboratory, Citadel Hill Plymouth PL1 2PB dassh.enquiries@mba.ac.uk distributor http://www.dassh.ac.uk/datasets/DASSHDT00000044 Click to get data A link to the web service or dataset http://www.dassh.ac.uk DASSH homepage A link to the general host site dataset 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 2–3 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.