fd231e649cbcaf02bb305b51f5bbefb9 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 2024-08-20 MEDIN Discovery metadata standard 2.3.8 urn:ogc:def:crs:EPSG::4326 2004-2012 Bishop et al. occurrence of non-native sessile invertebrates on the English coast 2015-03-23 publication DASSHDT00000092 http://https://www.dassh.ac.uk Between 2005 and 2012, 61 marinas and harbours around the English coast were surveyed to record the occurrence of non-native species (NNS) of sessile invertebrates. From these surveys, geographic distributions are described for eight species of ascidians, six bryozoans and five other species. A mean of 6.7 sessile invertebrate NNS per site (range 0 to 13 species) was recorded. At the 43 sites on the English Channel coast, the mean was 7.8 NNS per site, and all of the ten English sites that had 10 NNS were in the western or central region of the Channel coast. Ten sites on the Channel coast surveyed in 2004 were re-visited at least once in 2009 or 2010, and the mean number of sessile invertebrate NNS had increased from 6.0 to 7.6 species per site. Combining data from all visits in 2005 to 2012 for the sites surveyed in 2004, the mean number of NNS recorded per site rose to 9.2. Very rapid rates of spread along the English coast and beyond are inferred for the erect bryozoan Tricellaria inopinata d'Hondt and Occhipinti Ambrogi, 1985 and the ascidian Corella eumyota Traustedt, 1882. At least five recently arrived species that were limited to a small number of sites in 2012 are expected to increase markedly in geographic range and prevalence: the ascidians Asterocarpa humilis (Heller, 1878), Botrylloides diegensis Ritter and Forsyth, 1917, and Didemnum vexillum Kott, 2002; and the bryozoans Schizoporella japonica Ortmann, 1890 and Watersipora subatra (Ortmann, 1890). Rapid assessment surveys of marinas and similar sites proved to be an effective means of documenting the arrival and spread of NNS over a relatively wide geographic range and of distinguishing different rates of progression. John Bishop Marine Biological Association of the UK (MBA) 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 Text or Plaintext Delimited Marine Environmental Data and Information Network NDGO0005 Species distribution GEMET - INSPIRE themes, version 1.0 2008-01-06 revision Macroalgae generic abundance in water bodies Zoobenthos generic abundance Biodiversity indices SeaDataNet P021 parameter discovery vocabulary 2009-11-16 revision CC-BY: https://creativecommons.org/licenses/by/4.0/ otherRestrictions No marina names (if deduced) should be published without the marinas explicit consent. English biota Charting Progress 2 Sea Areas 2009-06-18 creation Eastern Channel Charting Progress 2 Sea Areas 2009-06-18 creation Western Channel and Celtic Sea Charting Progress 2 Sea Areas 2009-06-18 creation Irish Sea Charting Progress 2 Sea Areas 2009-06-18 creation Southern North Sea -3.5114 -2.6545 53.1788 54.0134 -6.0383 2.2674 49.7235 51.6444 -2.2590 1.5203 52.6688 55.6272 2004-09-01 2012-12-06 Cite as: Bishop JDD, Wood CA, Yunnie ALE, Griffiths CA (2015) Unheralded arrivals: non-native sessile invertebrates in marinas on the English coast. Aquatic Invasions. 10 (in press) 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 https://doi.org/10.15468/t9edux DOI link A link to the web service or dataset http://https://www.gbif.org A link to the general host site dataset This dataset is part of a larger dataset which includes Southern English marinas. Method - 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. Coordinates WGS 84 lat/long from www.gridreferencefinder.com Internal QA procedure at the Marine Biological Association.