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Scientific Name:
Didemnum vexillum Kott, 2002 (Stefaniak et al. 2009)
Common Name:
Colonial sea squirt, ascidian, colonial tunicate, compound sea squirt, carpet sea squirt
Native To:
Unknown, possibly Japan (Lambert 2009)
Date of U.S. Introduction:
First confirmed sighting in 1993 (Lambert 2009)
Means of Introduction:
Introductions likely due to shipping (either via hull or sea chest fouling) (Lambert 2009)
Impact:
Forms dense colonies that can smother native species (Bullard et al. 2007)
Current U.S. Distribution:
Coastal New England, Coastal Pacific Northwest
Images
Videos
Selected Resources
The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Colonial Sea Squirt.
Council or Task Force
Washington State Recreation and Conservation Office. Washington Invasive Species Council.
Partnership
International Council for the Exploration of the Sea.
See also: Alien Species Alert for more information
San Francisco Estuary Institute; Center for Research on Aquatic Bioinvasions.
IUCN. Species Survival Commission. Invasive Species Specialist Group.
Texas State University System. Texas Invasive Species Institute.
Federal Government
Smithsonian Institution. Smithsonian Environmental Research Center. Marine Invasions Research Lab.
International Government
New South Wales Department of Primary Industries (Australia).
State and Local Government
Academic
Columbia University. Center for Environmental Research and Conservation.
University of Alaska - Anchorage. Alaska Center for Conservation Science.
See also: Community Monitoring Invasive Species Information and Field Guides for more resources
University of Washington. Washington Sea Grant Program.
Citations
- Bullard, S.G., G. Lambert, M.R. Carman, J. Byrnes, R.B. Whitlatch, G. Ruiz, R.J. Miller, L. Harris, P.C. Valentine, J.S. Collie, J. Pederson, D.C. McNaught, A.N. Cohen, R.G. Asch, J. Dijkstra, and K. Heinonen. 2007. The colonial ascidian Didemnum sp. A: Current distribution, basic biology and potential threat to marine communities of the northeast and west coasts of North America. Journal of Experimental Marine Biology and Ecology 342(1):99-108.
- Lambert, G. 2009. Adventures of a sea squirt sleuth: unraveling the identity of Didemnum vexillum, a global ascidian invader. Aquatic Invasions 4(1):5-28.
- Stefaniak, L., G. Lambert, A. Gittenberger, H. Zhang, S. Lin, and R.B. Whitlatch. 2009. Genetic conspecificity of the worldwide populations of Didemnum vexillum Kott, 2002. Aquatic Invasions 4(1):29-44.