Journal of the Marine Biological Association of the United Kingdom

Alien species and other notable records from a rapid assessment survey of marinas on the south coast of England

F.  Arenas a1p1, J.D.D  Bishop a1a2c1, J.T.  Carlton a3, P.J.  Dyrynda , W.F.  Farnham a4, D.J.  Gonzalez a5, M.W  Jacobs a6, C.  Lambert a6p2, G.  Lambert a6p2, S.E.  Nielsen a1a2, J.A.  Pederson a7, J.S.  Porter a8, S.  Ward a9 and C.A.  Wood a1
a1 Marine Biological Association of the UK, Citadel Hill Laboratory, Plymouth, PL1 2PB,UK
a2 School of Biological Sciences, University of Plymouth, Drake Circus, Plymouth, PL4 8AA, UK
a3 Maritime Studies Programme, Williams College, Mystic Seaport, PO Box 6000, 75 Greenmanville Avenue, Mystic, CT 06355, USA
a4 Institute of Marine Sciences, University of Portsmouth, Eastney, Portsmouth, P04 9LY, UK
a5 67 Stonehill, Castle Donington, DE74 2LZ, UK
a6 University of Washington, Friday Harbor Laboratories,620 University Road, Friday Harbor,WA 98250, USA
a7 MIT Sea Grant College Programme, 292 Main Street, E 38-300, Cambridge, MA 02139, USA
a8 Institute of Biological Sciences, University of Wales, Aberystwyth, Edward Llwyd Building, Aberystwyth, SY23 3DA, UK
a9 Glanyrafon Farm, Llanbadarn Fawr, Aberystwyth, SY23 3HJ, UK

Article author query
arenas f   [PubMed][Google Scholar] 
bishop jdd   [PubMed][Google Scholar] 
carlton jt   [PubMed][Google Scholar] 
dyrynda pj   [PubMed][Google Scholar] 
farnham wf   [PubMed][Google Scholar] 
gonzalez dj   [PubMed][Google Scholar] 
jacobs mw   [PubMed][Google Scholar] 
lambert c   [PubMed][Google Scholar] 
lambert g   [PubMed][Google Scholar] 
nielsen se   [PubMed][Google Scholar] 
pederson ja   [PubMed][Google Scholar] 
porter js   [PubMed][Google Scholar] 
ward s   [PubMed][Google Scholar] 
wood ca   [PubMed][Google Scholar] 


In September 2004, a rapid assessment survey for non-native species was conducted at 12 harbours along the south coast of England from East Sussex to Cornwall, focusing on communities of algae and invertebrates colonizing floating pontoons in marinas. Over 80 taxa each of algae and invertebrates were recorded, including 20 recognized non-native species. The southern hemisphere solitary ascidian Corella eumyota was recorded in the UK for the first time and was present at three sites. The colonial ascidian Botrylloides violaceus was also recorded as new to the UK, but was very widespread and has probably been present for a number of years but misidentified as the native congener B. leachi, which was infrequent. Other ascidians included Styela clava, introduced at Plymouth in the early 1950s, which was recorded at all locations visited, and Perophora japonica, which was found only at the Plymouth locality where it first occurred in the UK in 1999. The diverse algal flora included nine alien species previously recorded in the British Isles. Range extensions and population increases were noted for the kelp Undaria pinnatifida and the bryozoan Tricellaria inopinata, both first recorded in UK waters during the 1990s. The widespread occurrence of another non-native bryozoan, Bugula neritina, appears significant, since in earlier times this was known in UK waters predominantly from artificially heated docks. The results of this survey indicate that dock pontoon systems in southern England are significant reservoirs of non-native species dispersed by vessels and other means. The proliferation of these structures is therefore of conservation importance. The new UK records highlight the need for periodic monitoring of ports for non-native species.

(Published Online December 15 2006)
(Received July 16 2005)
(Accepted August 8 2006)

c1 Corresponding author, e-mail:
p1 CIIMAR, Rua do Bragas 298, 4050-123 Porto, Portugal
p2 12001 11th Avenue NW, Seattle,WA 98177, USA